| Topic: |
Science > Physics |
| User: |
"souiss" |
| Date: |
27 Jan 2004 12:17:41 PM |
| Object: |
pulsed laser deposition |
I intend to buy a pulsed laser depostion (PLD) setup to deposit thin
ceramic films. By reading the litterature it seems that a lot of
people use KrF lasers with a wavelength of 248nm. However using a
solid-state Nd:YAG laser whose frequency is quadrupled (1064nm down
to 266nm) seems to be also possible.
What are the pros and the cons concerning the use of a KrF gas laser
and a Nd:YAG solid-state laser to work around 250nm for deposition of
thin oxide films?
Thanks in advance for your help and for sharing your experience of
PLD.
Souiss
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| User: "Uncle Al" |
|
| Title: Re: pulsed laser deposition |
27 Jan 2004 03:06:55 PM |
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souiss wrote:
I intend to buy a pulsed laser depostion (PLD) setup to deposit thin
ceramic films. By reading the litterature it seems that a lot of
people use KrF lasers with a wavelength of 248nm. However using a
solid-state Nd:YAG laser whose frequency is quadrupled (1064nm down
to 266nm) seems to be also possible.
What are the pros and the cons concerning the use of a KrF gas laser
and a Nd:YAG solid-state laser to work around 250nm for deposition of
thin oxide films?
1) The more complicated the system, the smaller the mean time
between failures.
2) What is the power available from each system? The *energy*
overall? The amount of chemistry you move is not related to the
power, but to total deposited energy.
3) A KrF laser can be mounted on the back of a truck. A
frequency-quadrupled setup is more likely mounted on a
vibration-isolated optical bench with exquisite temperature and angle
control of its non-linear optical crystals.
4) What does each system cost to buy? What is the cost of a year's
consummables including input energy and cooling? What is the
estimated lifetime of each system? What will it cost to overhaul?
If you can have one of two systems, one serviced by a high school grad
and the other by a PhD, which one do you wish to own? Uncle Al's VW
Golf is 15 years old and it has never needed any kind of maintenance
or servicing for power steering, power brakes, power windows, air
conditioning... because it doesn't have any. It simply and reliably
runs, getting its 29 mpg real world and chewing through a set of
Michelins every 60,000 miles. Admittedly it is on its second Sear's
DieHard battery. They only last about ten years in situ (and the
original VW battery was crap). Simplicity is good. (So is some
silicone stopcock grease on the battery's connects and their
surrounds).
--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
"Quis custodiet ipsos custodes?" The Net!
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