anamorphic prism

[Draco]

will a anamorphic prism pair from a green DPSS laser that are epoxied in place work for a blue laser diode? the 450nm versions?

[frostypaw]

Dependent on the different divergences of the two lasers surely - de-poxy and refit perhaps? The glass should be fine but it depends on the AR coatings I would have though, potentially quite lossy

[planters]

Of course you could test it, but I would guess not; only because of the AR coating. The prism angles and the principal should be fine. Anamorphic prisms have pretty large losses even when they have an optimized coating. Ten to 20% is not unusual. A less than optimal coating would be even worse. A cylinder pair will work much better.

[Draco]

wow i had not known the coatings would cause that much loss, my x/y rig had the same problem with the dichro the reflects red and pass other colors but i find it reflects green at a loss of about 20-30%. I have never used a cylinder pair or even where to get one, how would that be set up? my guess is the cylinder is flat on one side and curved on the other?
I some times see the anamorphic prisms that where taken from 473nm lasers, infact the same CNI one i have yet to align,
i am diffidently curious about the cylinder pair though

[norty303]

I put 520 and 445/462 through a common pair of prisms no problem.
Either they are BB coated or the 445 or 520 coatings are not very narrow.

[frostypaw]

The dichros... there's different ones for 532 and 520 I think I read, some pass lots of t'other frequency. You might have one of those, could be worth a test. edit> sorry you were saying about your red one, i'm sure there are varieties there too for 650/638

Similarly I have BB coated prisms, but stanwax sells ones specific for 638/520/445 I think.

Noob question perhaps but do all green DPSS and green/blue diode lasers share the same fast:slow axis ratio then? I might be getting all screwed up there but I would have thought even if B/G diodes are close enough the DPSS would probably be different, just seems counterintuitive.

[catalanjo]

The dichros... there's different ones for 532 and 520 I think I read, some pass lots of t'other frequency.

Hey I might be interested in one of those dichros = 520 pass 532 reflect, or vica-versa, if U know of a a source that doesn't leave me skint!
Cheers

[frostypaw]

Hey I might be interested in one of those dichros = 520 pass 532 reflect, or vica-versa, if U know of a a source that doesn't leave me skint!
Cheers

nowhere clever, there's just a zillion weird dichros on ebay. varies lots. spangle yourself with all the different scale graphs. i was going to get one to combine RGBV but decided it probably wasn't worth the hassle without 465nm as the blue

couldn't find one exactly matching the problem but assuming i read these right this could be sold to combine green+red and be good for 520 but lossy for 532
http://www.ebay.com/itm/Dichroic-Mir...-/160623040076

going the other way good for 520 shoddy 532
http://www.ebay.com/itm/Dichroic-Mir...-/310761502003

and a good for 532 bad for 520
http://www.ebay.com/itm/Dichroic-Mir...JcNWRswOCAc3YA
but it's such close wavelengths, doesn't give much room for error

this looks kinda like what you want but much dearer
http://www.ebay.com/itm/Dichroic-Mir...-/161955455536

this says it will reflect 532/transmit 520 at around a 90/80% level, but a shade cheaper
http://www.ebay.com/itm/Dualband-Dic...-/310611247749

*noob complete misunderstandings aside

[Sandstorm]

Noob question perhaps but do all green DPSS and green/blue diode lasers share the same fast:slow axis ratio then? I might be getting all screwed up there but I would have thought even if B/G diodes are close enough the DPSS would probably be different, just seems counterintuitive.

SA/FA depends on emitter size for laser diodes. DPSS works with a bit different principles and they usually are set up to emit TEM00, which is [very close to] Gaussian and has no SA/FA. Since I've never seen a showlaser module with multimode DPSS green, would be interesting if Draco provided some pictures and more details? I've never seen prism pairs inside 532 either...

[Draco]

there is the inside one of the lasers i use, it's made by CrystaLaser in 2003 and just accrued to me that the coatings on the prisms are coated for in-fared, i forgot that it is in the in-fared section of the laser, in setups that i have seen that have these in the visible light range i think the arrangement is the same or similar just different coatings. The gold block with the number 22 on it is the crystal pair for generating the 532nm beam and the mode is TEM00, The cheap crap high power laser pointers we have a hate/love deal with i have seen mode hop but that i think is because they are very over driven and have bottom of the bin parts in.
I marked out the beam path in this laser because i really really really need to find a few pump diodes and have no clue what the diode mount is, it's not C-Mount even though it's the same shape, the beam is inline rather then at a 90 degree angle like a C-Mount. I hope i have the lines drawn right and hope this helps. The output power is 25mw but could do 80mw when the lasers had less time on them, mine are running at end of life now and need new diodes, they still do 25mw but the controller is running at is max current now. the manufacture is useless for info, they just want to sell me a new unit rather then provide parts, i had to hand draw a partial schematic to get one unit up and running again.