We see a divergent beam of multimode KGW Raman laser with flat cavity mirrors, which is focused at the distance ~1.8 F, where F is lens focal length. It means that the beam has spherical component, which can be collimated by some lens at the output of Raman laser.
I think that it is well known effect, but can not find a paper, where this effect in Raman lasers is described. Can anybody give me a reference ?
Dmitry Nuzhdin
Dear Aleksandr,
This looks to me like a thermal lensing effect, would you think that this ref is of any use ?
Article High power tungstate-crystal Raman laser operating in the st...
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