Science > Physics > What are the obstacles to building a pen-sized free-electron laser?
| Topic: |
Science > Physics |
| User: |
"Radium" |
| Date: |
17 Jul 2006 10:08:58 PM |
| Object: |
What are the obstacles to building a pen-sized free-electron laser? |
Hi:
All laser pointers in the market use diode-lasers. What makes it so
difficult to make a pointer-sized free-electron laser?
Thanks,
Radium
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| User: "nicked" |
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| Title: Re: What are the obstacles to building a pen-sized free-electron laser? |
23 Jul 2006 10:10:59 AM |
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Not that difficult providing we are talking about a really large
pointer
Radium wrote:
Hi:
All laser pointers in the market use diode-lasers. What makes it so
difficult to make a pointer-sized free-electron laser?
Thanks,
Radium
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| User: "Sam Goldwasser" |
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| Title: Re: What are the obstacles to building a pen-sized free-electron laser? |
23 Jul 2006 10:38:06 AM |
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"nicked" <OutOfTurn@gmail.com> writes:
Not that difficult providing we are talking about a really large
pointer
There used to be HeNe laser-based laser pointers that were around 15
inches long with separate power supply being the size of a bread box. Is
that big enough? :)
--- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html
Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.
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| User: "Louis Boyd" |
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| Title: Re: What are the obstacles to building a pen-sized free-electronlaser? |
23 Jul 2006 11:52:03 AM |
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Sam Goldwasser wrote:
"nicked" <OutOfTurn@gmail.com> writes:
Not that difficult providing we are talking about a really large
pointer
There used to be HeNe laser-based laser pointers that were around 15
inches long with separate power supply being the size of a bread box. Is
that big enough? :)
What's the smallest free-electron laser which has been demonstrated to
function to date? The smallest I've heard of are "desk top size".
Bread boxes come in fairly large sizes too. Major bakeries deliver
using 18 wheel semi's.
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| User: "Sam Goldwasser" |
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| Title: Re: What are the obstacles to building a pen-sized free-electron laser? |
23 Jul 2006 06:35:26 PM |
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Louis Boyd <boyd@apt0.sao.arizona.edu> writes:
Sam Goldwasser wrote:
"nicked" <OutOfTurn@gmail.com> writes:
Not that difficult providing we are talking about a really large
pointer
There used to be HeNe laser-based laser pointers that were around 15
inches long with separate power supply being the size of a bread box. Is
that big enough? :)
What's the smallest free-electron laser which has been demonstrated to
function to date? The smallest I've heard of are "desk top size".
Bread boxes come in fairly large sizes too. Major bakeries deliver
using 18 wheel semi's.
I don't know but a small LINAC in a HeNe laser head-size enclosure with
its power supply in the bread box wouldn't be impossible. Add some disk
drive magnets and mirrors and... Voila! Instant free electron laser.
wavelength? I wonder if this would be a way to build a THz laser. Where
are those equations when you need them? :)
--- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html
Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.
.
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| User: "Chuck Grempu" |
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| Title: Re: What are the obstacles to building a pen-sized free-electron laser? |
17 Jul 2006 10:37:54 PM |
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"Radium" <glucegen1@excite.com> wrote in message
news:1153192138.781448.283830@p79g2000cwp.googlegroups.com...
Hi:
All laser pointers in the market use diode-lasers. What makes it so
difficult to make a pointer-sized free-electron laser?
how much power ?
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| User: "Radium" |
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| Title: Re: What are the obstacles to building a pen-sized free-electron laser? |
17 Jul 2006 10:39:15 PM |
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Chuck Grempu wrote:
"Radium" <glucegen1@excite.com> wrote in message
news:1153192138.781448.283830@p79g2000cwp.googlegroups.com...
Hi:
All laser pointers in the market use diode-lasers. What makes it so
difficult to make a pointer-sized free-electron laser?
how much power ?
The same amount of power used by a conventionaly laser-pointer
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| User: "C what I mean no" |
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| Title: Re: What are the obstacles to building a pen-sized free-electron laser? |
18 Jul 2006 07:04:34 AM |
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All laser pointers in the market use diode-lasers. What makes it so
difficult to make a pointer-sized free-electron laser?
Finding pointer-sized free-electrons!
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| User: "" |
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| Title: Re: What are the obstacles to building a pen-sized free-electron laser? |
18 Jul 2006 07:28:24 PM |
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In article <m74vg.5762$Oh1.3988@news01.roc.ny>, "C what I mean" <no spam@frontiernet.net> writes:
All laser pointers in the market use diode-lasers. What makes it so
difficult to make a pointer-sized free-electron laser?
Finding pointer-sized free-electrons!
English Pointer, or German shorthaired pointer?
Mati Meron | "When you argue with a fool,
meron@cars.uchicago.edu | chances are he is doing just the same"
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| User: "Don Klipstein" |
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| Title: Re: What are the obstacles to building a pen-sized free-electron laser? |
18 Jul 2006 12:02:35 AM |
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In <1153192138.781448.283830@p79g2000cwp.googlegroups.com>, Radium wrote:
All laser pointers in the market use diode-lasers. What makes it so
difficult to make a pointer-sized free-electron laser?
Major bigtime vacuum electron tube technology with bigtime high
voltage, with some major magnets.
I surely suspect better chances at esoteric semiconductor devices to do
that job more economically, should you want a laser pointer with
wavelength other than the roughly 650 nm red from diode lasers that some
dollar stores sell!
Heck, DPSS 532 nm green laser pointers (second harmonic of 1064 nm IR Nd
laser line) can be had for under $100 USD. And I suspect that laser
pointers with blue-violet wavelength close to 410 nm and of similar price
are no more than a year or two away - such laser diodes will be used in
the players of the next-generation optical discs that are supposed to hit
the market by the end of 2006!
- Don Klipstein (don@misty.com)
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| User: "" |
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| Title: Re: What are the obstacles to building a pen-sized free-electron laser? |
17 Jul 2006 10:45:02 PM |
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In sci.physics Radium <glucegen1@excite.com> wrote:
Hi:
All laser pointers in the market use diode-lasers. What makes it so
difficult to make a pointer-sized free-electron laser?
Thanks,
Radium
You mean other than the size of stuff like vacuum pumps, high voltage
power supplies, and shielding required to generate a relativistic
electron beam?
--
Jim Pennino
Remove .spam.sux to reply.
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| User: "" |
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| Title: Re: What are the obstacles to building a pen-sized free-electron laser? |
17 Jul 2006 11:21:44 PM |
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In article <6h1uo3-2hp.ln1@mail.specsol.com>, writes:
In sci.physics Radium <glucegen1@excite.com> wrote:
Hi:
All laser pointers in the market use diode-lasers. What makes it so
difficult to make a pointer-sized free-electron laser?
Thanks,
Radium
You mean other than the size of stuff like vacuum pumps, high voltage
power supplies, and shielding required to generate a relativistic
electron beam?
Well, to begin with, the size of the accelerator required.
Mati Meron | "When you argue with a fool,
meron@cars.uchicago.edu | chances are he is doing just the same"
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| User: "Radium" |
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| Title: Re: What are the obstacles to building a pen-sized free-electron laser? |
18 Jul 2006 09:58:08 AM |
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wrote:
In article <6h1uo3-2hp.ln1@mail.specsol.com>, writes:
In sci.physics Radium <glucegen1@excite.com> wrote:
Hi:
All laser pointers in the market use diode-lasers. What makes it so
difficult to make a pointer-sized free-electron laser?
Thanks,
Radium
You mean other than the size of stuff like vacuum pumps, high voltage
power supplies, and shielding required to generate a relativistic
electron beam?
Well, to begin with, the size of the accelerator required.
Is it possible to make vacuum pumps, high-voltage power supplies,
shielding and accelerators that are small enough to fit in a pen-sized
object?
Mati Meron | "When you argue with a fool,
meron@cars.uchicago.edu | chances are he is doing just the same"
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| User: "Phineas T Puddleduck" |
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| Title: Re: What are the obstacles to building a pen-sized free-electron laser? |
19 Jul 2006 05:58:25 PM |
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In article <1153234688.804235.132930@m73g2000cwd.googlegroups.com>,
Radium <glucegen1@excite.com> wrote:
Well, to begin with, the size of the accelerator required.
Is it possible to make vacuum pumps, high-voltage power supplies,
shielding and accelerators that are small enough to fit in a pen-sized
object?
Are you seriously asking this question?
--
Relf's Law? -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
"***** repeated to the limit of infinity asymptotically approaches
the odour of roses."
Corollary -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
³It approaches the asymptote faster, the more pseduos¹ you throw in
your formulas.²
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
³Gravity is one of the four fundamental interactions. The classical
theory of gravity - Einstein's general relativity - is the subject
of this book.² : Hartle/ Gravity pg 1
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Jaffa cakes. Sweet delicious orange jaffa goodness, and an abject lesson
why parroting information from the web will not teach you cosmology.
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| User: "Radium" |
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| Title: Re: What are the obstacles to building a pen-sized free-electron laser? |
19 Jul 2006 07:58:10 PM |
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Phineas T Puddleduck wrote:
In article <1153234688.804235.132930@m73g2000cwd.googlegroups.com>,
Radium <glucegen1@excite.com> wrote:
Well, to begin with, the size of the accelerator required.
Is it possible to make vacuum pumps, high-voltage power supplies,
shielding and accelerators that are small enough to fit in a pen-sized
object?
Are you seriously asking this question?
Yes.
--
Relf's Law? -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
"***** repeated to the limit of infinity asymptotically approaches
the odour of roses."
Corollary -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
=B3It approaches the asymptote faster, the more =8Cpseduos=B9 you throw in
your formulas.=B2
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
=B3Gravity is one of the four fundamental interactions. The classical
theory of gravity - Einstein's general relativity - is the subject
of this book.=B2 : Hartle/ Gravity pg 1
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Jaffa cakes. Sweet delicious orange jaffa goodness, and an abject lesson
why parroting information from the web will not teach you cosmology.
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| User: "" |
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| Title: Re: What are the obstacles to building a pen-sized free-electron laser? |
20 Jul 2006 04:16:10 AM |
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In article <1153357090.258108.302040@m79g2000cwm.googlegroups.com>,
"Radium" <glucegen1@excite.com> wrote:
Phineas T Puddleduck wrote:
In article <1153234688.804235.132930@m73g2000cwd.googlegroups.com>,
Radium <glucegen1@excite.com> wrote:
Well, to begin with, the size of the accelerator required.
Is it possible to make vacuum pumps, high-voltage power supplies,
shielding and accelerators that are small enough to fit in a pen-sized
object?
Are you seriously asking this question?
Yes.
You will cease getting silly answers if you ask where you
can find more information about your ideas. It is perfectly
reasonable to have one that won't work but you do need to
do your own research. Finding all this stuff out on your
own is fun. Most of the scientists here will be glad to
point you at reading and lab material.
/BAH
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| User: "Greg Hansen" |
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| Title: Re: What are the obstacles to building a pen-sized free-electronlaser? |
19 Jul 2006 08:40:30 PM |
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Radium wrote:
Phineas T Puddleduck wrote:
In article <1153234688.804235.132930@m73g2000cwd.googlegroups.com>,
Radium <glucegen1@excite.com> wrote:
Well, to begin with, the size of the accelerator required.
Is it possible to make vacuum pumps, high-voltage power supplies,
shielding and accelerators that are small enough to fit in a pen-sized
object?
Are you seriously asking this question?
Yes.
Vacuum tubes seem to work pretty well.
Seal it off with a getter to help maintain the vacuum. Electrons can be
accelerated electrostatically with a high voltage applied to electrodes
at each end. High voltages from batteries are no big trick, e.g. camera
flashes, although the current will be highly limited. Permanent magnets
along the tube can act as benders and wigglers.
Now, having laid out that basic plan, I have no idea if you'd actually
get a beam from it. Even big and fancy free electron lasers haven't
lived up to their promise, although efforts continue.
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| User: "Phat Bytestard" |
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| Title: Re: What are the obstacles to building a pen-sized free-electron laser? |
25 Jul 2006 10:06:54 PM |
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On Wed, 19 Jul 2006 20:40:30 -0500, Greg Hansen <glhansen@tcq.net>
Gave us:
Radium wrote:
Phineas T Puddleduck wrote:
In article <1153234688.804235.132930@m73g2000cwd.googlegroups.com>,
Radium <glucegen1@excite.com> wrote:
Well, to begin with, the size of the accelerator required.
Is it possible to make vacuum pumps, high-voltage power supplies,
shielding and accelerators that are small enough to fit in a pen-sized
object?
Are you seriously asking this question?
Yes.
Vacuum tubes seem to work pretty well.
Seal it off with a getter to help maintain the vacuum. Electrons can be
accelerated electrostatically with a high voltage applied to electrodes
at each end. High voltages from batteries are no big trick, e.g. camera
flashes, although the current will be highly limited. Permanent magnets
along the tube can act as benders and wigglers.
(Foghorn Leghorn inflection) Whatchubeensmokin', boy?
Heater enamel ceramics, I'd bet. ;-]
Now, having laid out that basic plan, I have no idea if you'd actually
get a beam from it.
Heater will open outside a vacuum. In an Oxygen environment, moth
and rust doth corrupt.
Even big and fancy free electron lasers haven't
lived up to their promise, although efforts continue.
Whatchubeensmokin', boy?
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| User: "Eeyore" |
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| Title: Re: What are the obstacles to building a pen-sized free-electron laser? |
19 Jul 2006 08:23:05 PM |
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Radium wrote:
Phineas T Puddleduck wrote:
In article <1153234688.804235.132930@m73g2000cwd.googlegroups.com>,
Radium <glucegen1@excite.com> wrote:
Well, to begin with, the size of the accelerator required.
Is it possible to make vacuum pumps, high-voltage power supplies,
shielding and accelerators that are small enough to fit in a pen-sized
object?
Are you seriously asking this question?
Yes.
You're even madder than some ppl may have thought in that case.
Do you enjoy ridiculing yourself on Usenet ?
Graham
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| User: "" |
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| Title: Re: What are the obstacles to building a pen-sized free-electron laser? |
18 Jul 2006 09:51:50 PM |
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In article <1153234688.804235.132930@m73g2000cwd.googlegroups.com>, "Radium" <glucegen1@excite.com> writes:
mmeron@cars3.uchicago.edu wrote:
In article <6h1uo3-2hp.ln1@mail.specsol.com>, writes:
In sci.physics Radium <glucegen1@excite.com> wrote:
Hi:
All laser pointers in the market use diode-lasers. What makes it so
difficult to make a pointer-sized free-electron laser?
Thanks,
Radium
You mean other than the size of stuff like vacuum pumps, high voltage
power supplies, and shielding required to generate a relativistic
electron beam?
Well, to begin with, the size of the accelerator required.
Is it possible to make vacuum pumps, high-voltage power supplies,
shielding and accelerators that are small enough to fit in a pen-sized
object?
Sure. Just do the following:
step 1: behave nicely the whole year.
step 2: come December, ask Santa Klaus to deliver the items above.
step 3: go back to step 1.
Mati Meron | "When you argue with a fool,
meron@cars.uchicago.edu | chances are he is doing just the same"
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| User: "" |
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| Title: Re: What are the obstacles to building a pen-sized free-electron laser? |
19 Jul 2006 04:07:19 AM |
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In article <a7hvg.20$25.582@news.uchicago.edu>,
wrote:
In article <1153234688.804235.132930@m73g2000cwd.googlegroups.com>, "Radium"
<glucegen1@excite.com> writes:
wrote:
In article <6h1uo3-2hp.ln1@mail.specsol.com>,
writes:
In sci.physics Radium <glucegen1@excite.com> wrote:
Hi:
All laser pointers in the market use diode-lasers. What makes it so
difficult to make a pointer-sized free-electron laser?
Thanks,
Radium
You mean other than the size of stuff like vacuum pumps, high voltage
power supplies, and shielding required to generate a relativistic
electron beam?
Well, to begin with, the size of the accelerator required.
Is it possible to make vacuum pumps, high-voltage power supplies,
shielding and accelerators that are small enough to fit in a pen-sized
object?
Sure. Just do the following:
step 1: behave nicely the whole year.
step 2: come December, ask Santa Klaus to deliver the items above.
step 3: go back to step 1.
Huh? I thought you physicists asked the purple unicorn for
gifts. I'll never keep this stuff straight.
/BAH
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| User: "" |
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| Title: Re: What are the obstacles to building a pen-sized free-electron laser? |
19 Jul 2006 11:30:19 AM |
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In article <e9kso7$8ss_001@s997.apx1.sbo.ma.dialup.rcn.com>, writes:
In article <a7hvg.20$25.582@news.uchicago.edu>,
mmeron@cars3.uchicago.edu wrote:
In article <1153234688.804235.132930@m73g2000cwd.googlegroups.com>, "Radium"
<glucegen1@excite.com> writes:
mmeron@cars3.uchicago.edu wrote:
In article <6h1uo3-2hp.ln1@mail.specsol.com>,
writes:
In sci.physics Radium <glucegen1@excite.com> wrote:
Hi:
All laser pointers in the market use diode-lasers. What makes it so
difficult to make a pointer-sized free-electron laser?
Thanks,
Radium
You mean other than the size of stuff like vacuum pumps, high voltage
power supplies, and shielding required to generate a relativistic
electron beam?
Well, to begin with, the size of the accelerator required.
Is it possible to make vacuum pumps, high-voltage power supplies,
shielding and accelerators that are small enough to fit in a pen-sized
object?
Sure. Just do the following:
step 1: behave nicely the whole year.
step 2: come December, ask Santa Klaus to deliver the items above.
step 3: go back to step 1.
Huh? I thought you physicists asked the purple unicorn for
gifts. I'll never keep this stuff straight.
Well, he's a kid, what does he know about purple unicorns.
Mati Meron | "When you argue with a fool,
meron@cars.uchicago.edu | chances are he is doing just the same"
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| User: "" |
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| Title: Re: What are the obstacles to building a pen-sized free-electron laser? |
26 Jul 2006 12:05:54 AM |
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In article <4kmdc259lpouks43ofiuoac009ikrbfh57@4ax.com>, Phat Bytestard <phatbytestard@getinmahharddrive.org> writes:
On Wed, 19 Jul 2006 16:30:19 GMT, Gave us:
In article <e9kso7$8ss_001@s997.apx1.sbo.ma.dialup.rcn.com>, writes:
In article <a7hvg.20$25.582@news.uchicago.edu>,
wrote:
In article <1153234688.804235.132930@m73g2000cwd.googlegroups.com>, "Radium"
<glucegen1@excite.com> writes:
wrote:
In article <6h1uo3-2hp.ln1@mail.specsol.com>,
writes:
In sci.physics Radium <glucegen1@excite.com> wrote:
Hi:
All laser pointers in the market use diode-lasers. What makes it so
difficult to make a pointer-sized free-electron laser?
Thanks,
Radium
You mean other than the size of stuff like vacuum pumps, high voltage
power supplies, and shielding required to generate a relativistic
electron beam?
Well, to begin with, the size of the accelerator required.
Is it possible to make vacuum pumps, high-voltage power supplies,
shielding and accelerators that are small enough to fit in a pen-sized
object?
Sure. Just do the following:
step 1: behave nicely the whole year.
step 2: come December, ask Santa Klaus to deliver the items above.
step 3: go back to step 1.
Huh? I thought you physicists asked the purple unicorn for
gifts. I'll never keep this stuff straight.
Well, he's a kid, what does he know about purple unicorns.
Mati Meron | "When you argue with a fool,
meron@cars.uchicago.edu | chances are he is doing just the same"
And they're tasty too!
Shhh, don't tell everybody, the supply is limited.
Mati Meron | "When you argue with a fool,
meron@cars.uchicago.edu | chances are he is doing just the same"
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| User: "STEVE ROBERTS" |
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| Title: Re: What are the obstacles to building a pen-sized free-electron laser? |
19 Jul 2006 11:52:49 AM |
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My hunch is radixm, archimexes plutonium , News2x2x and a few others
are a ongoing research project by some psych professor and his grad
students to find out how much bullcrap usenet experts will take. Note
that I put in the x's to fool the search engines, cause gawd knows we
don't need a 2o2o around again, unless its a Spectra 2020 doing 3
tunable watts whitelight in FEL mode and its free. Problem is you
guys just told this nut about the sacred dogs!, whats next, are you
guys gonna tell him about Area 52?. Maybe if we're luckly the Air
Force would invite him out to Starfire and teach him a few things, does
the remaining grey matter adsorb at sodium guidestar wavelengths? Make
sure we tell him how tinfoil hats actually improve coupling at 2.5 Ghz!
lol,
Steve Roberts
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| User: "Phat Bytestard" |
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| Title: Re: What are the obstacles to building a pen-sized free-electron laser? |
25 Jul 2006 09:58:47 PM |
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On Wed, 19 Jul 2006 16:30:19 GMT, Gave us:
In article <e9kso7$8ss_001@s997.apx1.sbo.ma.dialup.rcn.com>, writes:
In article <a7hvg.20$25.582@news.uchicago.edu>,
wrote:
In article <1153234688.804235.132930@m73g2000cwd.googlegroups.com>, "Radium"
<glucegen1@excite.com> writes:
wrote:
In article <6h1uo3-2hp.ln1@mail.specsol.com>,
writes:
In sci.physics Radium <glucegen1@excite.com> wrote:
Hi:
All laser pointers in the market use diode-lasers. What makes it so
difficult to make a pointer-sized free-electron laser?
Thanks,
Radium
You mean other than the size of stuff like vacuum pumps, high voltage
power supplies, and shielding required to generate a relativistic
electron beam?
Well, to begin with, the size of the accelerator required.
Is it possible to make vacuum pumps, high-voltage power supplies,
shielding and accelerators that are small enough to fit in a pen-sized
object?
Sure. Just do the following:
step 1: behave nicely the whole year.
step 2: come December, ask Santa Klaus to deliver the items above.
step 3: go back to step 1.
Huh? I thought you physicists asked the purple unicorn for
gifts. I'll never keep this stuff straight.
Well, he's a kid, what does he know about purple unicorns.
Mati Meron | "When you argue with a fool,
meron@cars.uchicago.edu | chances are he is doing just the same"
And they're tasty too!
.
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| User: "Phat Bytestard" |
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| Title: Re: What are the obstacles to building a pen-sized free-electron laser? |
19 Jul 2006 09:15:40 PM |
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On Wed, 19 Jul 06 09:07:19 GMT, Gave us:
In article <a7hvg.20$25.582@news.uchicago.edu>,
mmeron@cars3.uchicago.edu wrote:
In article <1153234688.804235.132930@m73g2000cwd.googlegroups.com>, "Radium"
<glucegen1@excite.com> writes:
mmeron@cars3.uchicago.edu wrote:
In article <6h1uo3-2hp.ln1@mail.specsol.com>,
writes:
In sci.physics Radium <glucegen1@excite.com> wrote:
Hi:
All laser pointers in the market use diode-lasers. What makes it so
difficult to make a pointer-sized free-electron laser?
Thanks,
Radium
You mean other than the size of stuff like vacuum pumps, high voltage
power supplies, and shielding required to generate a relativistic
electron beam?
Well, to begin with, the size of the accelerator required.
Is it possible to make vacuum pumps, high-voltage power supplies,
shielding and accelerators that are small enough to fit in a pen-sized
object?
Sure. Just do the following:
step 1: behave nicely the whole year.
step 2: come December, ask Santa Klaus to deliver the items above.
step 3: go back to step 1.
Huh? I thought you physicists asked the purple unicorn for
gifts. I'll never keep this stuff straight.
First, the guy asks about "free electron" "powered" devices, then,
upon hearing that there is no POWER available in such realms, he now
wants HV supplies.
I made an HV supply at 15kV that would fit six units in a pack of
cigs.
Ran off 3 volts. Anyway, laser diodes don't need that much to feed
'em.
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| User: "" |
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| Title: Re: What are the obstacles to building a pen-sized free-electron laser? |
18 Jul 2006 10:55:03 AM |
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In sci.physics Radium <glucegen1@excite.com> wrote:
mmeron@cars3.uchicago.edu wrote:
In article <6h1uo3-2hp.ln1@mail.specsol.com>, writes:
In sci.physics Radium <glucegen1@excite.com> wrote:
Hi:
All laser pointers in the market use diode-lasers. What makes it so
difficult to make a pointer-sized free-electron laser?
Thanks,
Radium
You mean other than the size of stuff like vacuum pumps, high voltage
power supplies, and shielding required to generate a relativistic
electron beam?
Well, to begin with, the size of the accelerator required.
Is it possible to make vacuum pumps, high-voltage power supplies,
shielding and accelerators that are small enough to fit in a pen-sized
object?
In comic books and scifi movies.
--
Jim Pennino
Remove .spam.sux to reply.
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| User: "Eeyore" |
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| Title: Re: What are the obstacles to building a pen-sized free-electron laser? |
18 Jul 2006 11:04:25 AM |
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wrote:
In sci.physics Radium <glucegen1@excite.com> wrote:
Is it possible to make vacuum pumps, high-voltage power supplies,
shielding and accelerators that are small enough to fit in a pen-sized
object?
In comic books and scifi movies.
What was that one where they shrunk a craft and its crew and injected them into the
bloodstream ?
If we did that to Radium they could take out his remaining brain cells with a laser
cannon !
Graham
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| User: "Rich Grise" |
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| Title: Re: What are the obstacles to building a pen-sized free-electron laser? |
21 Jul 2006 06:50:47 PM |
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On Tue, 18 Jul 2006 17:04:25 +0100, Eeyore wrote:
jimp@specsol.spam.sux.com wrote:
In sci.physics Radium <glucegen1@excite.com> wrote:
Is it possible to make vacuum pumps, high-voltage power supplies,
shielding and accelerators that are small enough to fit in a pen-sized
object?
In comic books and scifi movies.
What was that one where they shrunk a craft and its crew and injected them into the
bloodstream ?
"Fantastic Voyage". Oddly enough, The Good Doctor Asimov had his hands in
that, like he wrote the original story.
I saw a different movie on the same theme, but with Dennis Quaid and
Martin Short, but I can't remember the name of it - the craft has only
Quaid in it, and it accidentally gets stuck into Short, and nobody knows
it's there - attempted hilarity ensues. ;-)
Cheers!
Rich
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| User: "Bob Myers" |
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| Title: Re: What are the obstacles to building a pen-sized free-electron laser? |
24 Jul 2006 11:05:20 AM |
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"Rich Grise" <rich@example.net> wrote in message
news:pan.2006.07.22.07.49.38.826325@example.net...
In comic books and scifi movies.
What was that one where they shrunk a craft and its crew and injected
them into the
bloodstream ?
"Fantastic Voyage". Oddly enough, The Good Doctor Asimov had his hands in
that, like he wrote the original story.
Minor trivia bit: the Good Doctor actually did not write the
ORIGINAL story. "Fantastic Voyage," the novel by Isaac
Asimov, was actually an adaptation of the previously-written
screenplay. In one of Asimov's columns for Analog magazine,
he once discussed the problems he had in coming up with
a plausible process for shrinking the submarine and crew, given
the way the original screenplay had been written. In his novel,
there's also a very slightly different ending - they had to make
sure that the white blood cell that had ingested the _Proteus_
ALSO made it out from Benes' body, or else the expanding
bits of wrecked submarine would've killed him just as
certainly as the injury they were trying to cure. That little bit
was completely ignored in the movie.
I saw a different movie on the same theme, but with Dennis Quaid and
Martin Short, but I can't remember the name of it - the craft has only
Quaid in it, and it accidentally gets stuck into Short, and nobody knows
it's there - attempted hilarity ensues. ;-)
"InnerSpace," 1987.
Bob M.
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| User: "Rich Grise" |
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| Title: Re: What are the obstacles to building a pen-sized free-electron laser? |
24 Jul 2006 12:03:20 PM |
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On Mon, 24 Jul 2006 16:05:20 +0000, Bob Myers wrote:
"Rich Grise" <rich@example.net> wrote in message
news:pan.2006.07.22.07.49.38.826325@example.net...
In comic books and scifi movies.
What was that one where they shrunk a craft and its crew and injected
them into the
bloodstream ?
"Fantastic Voyage". Oddly enough, The Good Doctor Asimov had his hands
in that, like he wrote the original story.
Minor trivia bit: the Good Doctor actually did not write the ORIGINAL
story. "Fantastic Voyage," the novel by Isaac Asimov, was actually an
adaptation of the previously-written screenplay. In one of Asimov's
columns for Analog magazine, he once discussed the problems he had in
coming up with a plausible process for shrinking the submarine and crew,
given the way the original screenplay had been written. In his novel,
there's also a very slightly different ending - they had to make sure that
the white blood cell that had ingested the _Proteus_ ALSO made it out from
Benes' body, or else the expanding bits of wrecked submarine would've
killed him just as certainly as the injury they were trying to cure. That
little bit was completely ignored in the movie.
I saw a different movie on the same theme, but with Dennis Quaid and
Martin Short, but I can't remember the name of it - the craft has only
Quaid in it, and it accidentally gets stuck into Short, and nobody knows
it's there - attempted hilarity ensues. ;-)
"InnerSpace," 1987.
Bob M.
Thanks for this! Plus, I remember that getting the Quaid vehicle out
without blowing up Short was quite instrumental to the plot, toward
the end, so to speak. :-)
Thanks!
Rich
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