473nm polarisation...

[LesioQ]

Not any one that I know of. At least not a brewster-inclined one

Piotr.K

[buffo]

It might be the case on more expensive models...

However, I've seen DPSS greens with *lousy* polarization ratios (we're talking 5:1 here). So it wouldn't surprise me to discover that those grossly inefficient cavities were simply sending the randomly-polarized 1064 into the KTP and just hoping for the best. And thus it follows that they'd do the same thing with cheaper blue models as well...

Adam

[DMills]

Remember that a blue cavity needs something to suppress the 1064 anyway or the yag will lase there instead of on the much lower gain 946 line, It might be possible to make that component (probably one or both cavity mirrors) polarisation sensitive.

946 is MUCH less gainy then 1064, so you will tend to get lower intracavity powers and hence MUCH lower conversion efficiency for a given non linear effect.

I strongly suspect that doubled 946 takes polarisation quite seriously even in the 'cheap' units.

Regards, Dan.

[MechEng3]

You would be surprised....the polorisation is random out of the yag to some extent with regards to the pump polarity. The issue I have seen is that some crystals are just a better cut than others. BiBo that is. Some crystals I have dropped into a cavity and no matter where it was it made blue photons. Others, most of them, only had a very small position that would peak in the 473/946 conversion. I mean small enough to make a 1/16 turn on the micro positioner and loose it totally. The crystal itself just regards 946 more so than 1064..... So getting a quality crystal was the big thing to me. But that is what you get with bulk lasers. They die...they get replaced.

[mixedgas]

Hum, Nd:vandate is supposed to be inherently 400:1, maybe not all blues use the more effective vandate? Nd:Yag does not have a fast and slow axis. Probably some are thus using nd:yag.

Steve

[ElektroFreak]

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[mixedgas]

I don't think vanadate has a 946nm line.. I know it has a 914nm line which results in 457nm blue. I've long been under the impression that 473nm lasers use Nd:YAG.

Your right, I just looked it up. Its there, but much weaker then in YAG. Still,depending on if its type one or type two conversion, you still may have strong polarization.

Steve