YVO4 Crystal 5x2.9x9.6mm Yttrium Vanadate

Ebay: YVO4 Crystal 5x2.9x9.6mm Yttrium Vanadate

New Casix 501 060 000 YVO4 Crystal 5x2 9x9 6mm Yttrium Vanadate | eBay

Can this be used to build a high power 532nm laser? aside from a pump diode and collimation, what else is needed, anyone?

Mirrors and a frequency doubler (obviously). Cant view the listing, but some crystals are coated to eliminate the need for mirrors-HR532 HT1064 on one side, HT808 on the other.

Thanks, any idea who might coat such a crystal and if it is terribly expensive, if needing mirrors?

You can probably find mirrors on ebay. Getting an individual crystal coated would not be with the cost. I think meredith instruments sells crystals with the proper coatings. Btw I told you the wrong coatings; the vanadate will be HT808 on one side, HR1064 on the other side. The doubler will be HT1064 HR808 on side and HR532 HT1064/808 on the other. Then the OC will be HR808/1064 HT532.

Thanks, this guy thinks these are AR coated for C-Band, maybe not good for use where I want to use it then. I've googled C-Band and it is closer to 1500nm, but I know so little about this kind of thing, I'm not sure.

crazyspaz said:

You can probably find mirrors on ebay. Getting an individual crystal coated would not be with the cost. I think meredith instruments sells crystals with the proper coatings. Btw I told you the wrong coatings; the vanadate will be HT808 on one side, HR1064 on the other side. The doubler will be HT1064 HR808 on side and HR532 HT1064/808 on the other. Then the OC will be HR808/1064 HT532.

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Actually, that's not quite right....generally the lasing medium is HT 808/HR1064/HR532, and then HR808/AR1064/AR532

and then the KTP is DBAR 1064/532 and the OC is HR 1064 and sometimes partially reflective 532 depending on how many passes you want.

or at least this is the way CNI does it. depends on where you want light to go. some people allow the 532 to span the entire cavity, some people stop it at the KTP. depends on what you want your beam to be like.

ultimatekaiser said:

Actually, that's not quite right....generally the lasing medium is HT 808/HR1064/HR532, and then HR808/AR1064/AR532

and then the KTP is DBAR 1064/532 and the OC is HR 1064 and sometimes partially reflective 532 depending on how many passes you want.

or at least this is the way CNI does it. depends on where you want light to go. some people allow the 532 to span the entire cavity, some people stop it at the KTP. depends on what you want your beam to be like.

Click to expand...

Yea *cough* thats uh, what I meant, yea.
I will just play it off as "i was typing on my phone and mistyped"
Which is slightly true.
slightly.

crazyspaz said:

Yea *cough* thats uh, what I meant, yea.
I will just play it off as "i was typing on my phone and mistyped"
Which is slightly true.
slightly.

Click to expand...

sure it was

It was a good try though. And what you put down would probably work too. The beam would just have different properties.

The seller says the AR coating is a yellowish-greenish tint, probably for 1500 nm. Does this prevent use for a 532nm pumped laser with a KTP?

Disregard, I received this answer, below, on another forum that these are likely used for 1550nm telecom. For the sake of other LPF members looking to do the same thing someday (Please forgive me for ripping from another group) I thought it worth posting his response here:

mixedgas said:

1. No visible purple tint that changes color with angle and ambient lighting in the crystal, probably undoped YV04 used as a high index of refraction optic.
2. C Band coating, 1550 nm. Doped Vandate does not lase significantly in 1550 region.

Rough conclusion: Its a compensator optic of some sort for a Mid IR telecom device and not a laser crystal.

For known good laser crystals, I'm going to put a plug in here for my former employer, Altos Photonics. You might pay 2X over Ebay, but Russian grown crystals and Lithuanian Optical Coatings are actually quite good. (Well, Actually superb !) That way you know what your getting and the prices are reasonable. If you dig deep enough into the Altos Website you'll find the Eksma Optics laser crystals page (Not the Rods page) with actual US prices. If not, call the office and get a quote.

Really, really, screaming lasers need "capped" vanadate with un-doped ends fused onto the doped Vanadate or you need a high Quality oriented and coated crystal like Altos sells.

Having built or repaired a few lasers, I'm weary of Ebay DPSS parts. Eksma treats their parts as if they are all destined for lab service, so the coatings are good and the orientations are correct.

Steve

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MAybe give these guys in NY a call.

They supply crystals and can suggest a crystal system and how to make use of it.

Non-linear Optical crystals, Birefringent crystals, E-O/A-O crystals

Nd:YVO4 in a frequency-doubled green laser pointer. Internal construction is shown. AAA-type cells and electronics lead to a laser module (enlarged in lower diagram). This contains a powerful 808 nm IR diode laser that pumps a Nd:YVO4 laser crystal, in turn providing 1064 nm light. This immediately is doubled inside a nonlinear optics KTP crystal, resulting in green light at the half-wavelength of 532 nm. This beam is expanded and infrared-filtered. see diagram here: Neodymium-doped yttrium orthovanadate - Wikipedia, the free encyclopedia

What is it you actually want to do?

Thank you very much, I spent quite a few minutes looking at their offerings. One of the things I want to ask them is how much 532nm power can be had for a given size of ktp crystal and how hard they need to be driven with IR to get it. I can't seem to find the information through google searches, maybe just using the wrong terms.

Laser Project said:

Thank you very much, I spent quite a few minutes looking at their offerings. One of the things I want to ask them is how much 532nm power can be had for a given size of ktp crystal and how hard they need to be driven with IR to get it. I can't seem to find the information through google searches, maybe just using the wrong terms.

Click to expand...

The most common DPSSL in use is the 532 nm wavelength green laser pointer. A powerful (>200 mW) 808 nm wavelength infrared GaAlAs laser diode pumps a neodymium-doped yttrium aluminium garnet (Nd:YAG) or a neodymium-doped yttrium orthovanadate (Nd:YVO4) crystal which produces 1064 nm wavelength light from the main spectral transition of neodymium ion. This light is then frequency doubled using a nonlinear optical process in a KTP crystal, producing 532 nm light. Green DPSSLs are usually around 20% efficient, although some lasers can reach up to 35% efficiency.

In other words, a green DPSSL using a 2.5 W pump diode would be expected to output around 500-900 mW of 532 nm light.

In optimal ideal conditions, Nd:YVO4 has a conversion efficiency of 60%, while KTP has a conversion efficiency of 80%. In other words, a green DPSSL can theoretically have an overall efficiency of 48%


You might be better off with a cost effective professional production made 532nm that is exactly what you need rather than playing around with crystals, diodes and optics mountings and everything else you would need. You are going to find out that even under good conditions and with experienced knowledgeable professional building techs, they are not easy to make fine tune and tweak and results vary widely--each one being different.

ONe guy who makes not cheap but very good 532nm modules is Lasever see: http://www.lasever.com/plus/view.php?aid=152

Why attempt to reinvent the wheel when someone probably makes a production unit the fits what you want to do?

I'm a believer, I just spent all weekend trying to rescue a 250mw pointer I have and driving it hard with 4 watts of IR I only have 15 percent efficiency. I have a new appreciation for laser pointers done right. (puts out more than double now, but still, only 15 percent or so efficient). I guess I'm driving the crystal too hard for what it is.

Yes it certainly isn't easy that's for sure. I'm fixing a 589 PGL-M right now and it's quite a royal pain in the ass. It needed a new pump diode and the alignment is messed in a few ways I rather dislike

I can sure tell when the crystal is getting too hot, if I over drive it... The efficiency drops, I can get 550 mw out of it at 3.7 amps of current to the IR diode, push that up to 5 amps and the output drops to 400mw and lower. If I had a TEC controling the crystal temperature, I could probably get 800mw out of this thing.