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Thread: opsl - when did these happen?

  1. #21
    Join Date
    May 2007
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    Quote Originally Posted by Draco View Post
    I don't think I have come across this term with a small laser so what does the thermal lensing do? does it drift with temp?
    From what I know and from what I have seen while playing with this opsl is that the SHG crystal seems to drift and starts to poison the optical resonance. I notice that as the temperature shifts, the power fades off at on extreme or the other but in this range, the power goes up and down as it degrades. So, 50mw at the sweet spot and then 5mw, then 30, then 1mw, then 10 until there is nothing. So, to me, it shifts enough to disrupt the resonance until it just cannot lase.

    Someone who knows more can certainly correct me if I'm wrong but that's what it looks like to me.

  2. #22
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    Jan 2006
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    Quote Originally Posted by Draco View Post
    so what does the thermal lensing do?
    Here is a good primer on the topic.

    But in a nutshell, temperature variation in a solid can cause it's optical properties to change significantly. Since the optical elements in this laser are extremely small, even a small change in refraction can have a large effect on the output.

    Adam

  3. #23
    Join Date
    Nov 2008
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    I am finally back to this project. I hope to open one of the greens and try some other pump wavelengths. I got some clean room time Thursday. Iím hitting it with a range from 700-1500nm. I have little hope due to the coatings but we will see. I tried a crude attempt a while back with no luck. This setup will let me use good positioners for alignment.

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