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CR:YAG

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Daedronus

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Nov 4, 2009, 11:54:13 PM11/4/09
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What would be a good ballpark figure for the initial transmittance for
a cr:yag passive q-switch?

This would be for a flash lamp pumped nd:yag laser with about 100-300J
of electrical power.

I know there is probably a lot of math behind it, but that is far
beyond me.

Regards.

David

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Nov 9, 2009, 11:29:47 AM11/9/09
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I don't know much, but I guess if you want to make it lase, start with
Cr:YAG at high initial transmission, like 85%. After you can make it
lase, use Cr:YAG with low initial transmission, like 35%. Lower
initial transmission increase the threshold pump power but increase
the slope efficiency.

STEVE ROBERTS

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Nov 10, 2009, 11:43:22 AM11/10/09
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Email AlphaLas in Germany and ask them for help.

They sell passive Qswitches and can probably refer you to the proper
paper. I'm 240 miles from my Archive and can't pull the refs for you,
sorry.

Steve

Daedronus

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Nov 12, 2009, 8:44:44 AM11/12/09
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I have ordered a 39% piece from the chinese guys.
I'll try that with a 40% optical coupler and if it won't work with 80%
one.

It was only 80$ so I won't cry too much If I can't get it to lease.

Also according to the AlphaLas pdf about cr:yags:

"We have a large variety of Cr4+:YAG standard crystals in stock for:
- Flashlamp-pumped lasers with T=0.25, T=0.32, T= 0.50
- Diode-pumped lasers with T= 0.80, T=0.85, T=0.9 and T=0.95"

I have seen this before, this is more or less why I went for 39%.
Seemed like a conservative value.

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