Can anyone help identify the purpose of this 782nm laser diode?

I believe this 782 nm infrared water cooled laser diode might have been designed for pumping a laser rod, but for what wavelength the rod could produce when pumped with 782nm I have no idea. Will 782nm work with a ND:YAG rod? Anyone here recognize this? I cannot find anything on it either at the Coherent.com web site, or on the web.





PN:

IDK.... I'd contact Coherent tomorrow.

Jerry

I seldom have any luck contacting the manufacturers for info on obsolete products, I can't find this in their products now. Perhaps I should try.

Just ask to talk to an Application Engineer/Technician.
A salesman only wants to sell you something. He doesn't
want to be bothered looking up info on a non-sale... IMO
You do have the PO # and date Shipped....

Jerry

I think it might be an old LIDAR diode, pulse, but don't have specs for it.

Edit: Checking the absorption wavelengths/lines to pump ND:YAG, 782nm isn't high enough, well, worse than that, no absorption peaks there at all, so I don't think it is for that rod, or for that matter, any other rod when searching the net.

780nm is great for low atmospheric attenuation, that's probably why that wavelength was used for early high power LIDAR, but the wavelength keeps moving in the commercial devices market, went to 850nm, now 905nm for a lot of rangefinding gear. However, 905 is crap for that due to relatively high attenuation. I'm talking long distances though, most commercial rangefinder users don't need that, golfers don't need to measure very far.

782nm has been known to be used to pump Tm:YAG rods. The emission produced is 2010nm and is know as a thulium laser. They are used mainly for medical applications. As you already said, 782nm is too low a central wavelength for ND:YAG. You could also theoretically produce a 391nm SHG.

The guy I bought this from just emailed me that it was to pump 2 um rods, that matches what you suggested too. On his ebay listing he suggested it could be used for pumping a rod, but I thought he was wrong.. Nope, I see he was right and I just needed to ask again for more specifics.

The case says burn in tested at greater than 8M, any idea on that whether referring to time or pulse energy? I might just contact coherent on this, just that I have had so many laser companies ignore politely worded questions about old stuff that I am now conditioned to assume they won't answer me. I think they are worried I might shoot myself in the eye or the stuff is just too old and they don't know, either way often silence. Maybe just because it isn't a sale and I need to do what Jerry suggested from now on.

Regarding this device, I don't want it for pumping a rod, but for other experiments, so that doesn't matter. However, I want to find the specs to know if I should pulse it at a max of 75 amps and if so, for how long, or whether that current rating is for CW. Being water cooled and the size it is, my guess is it is a long pulse rating and not CW, I think it is just too small for that, but then again, I am unfamiliar with water cooled diodes and what their ratings can be.

At least I was correct on the application. >8M, I thought that was to do with lifetime, as in it will last 8 million shots but I could be totally wrong. I know, it is difficult to get a response from certain companies I have noticed.

I was editing more into the post as you were typing an answer. I would think 8 million shots would use it up too much.

The only way of getting exactly what you want is to find out from the manufacturer. These aren't that common AFAIK. I don't know if anyone on here has had any experience with these. All we know is what they are used for. You are probably right on the shots thing. It is possible that they are CW as it states power, not peak power or any mention of any duration. You would need sufficient water cooling for this laser it seems.

OK, I see what they probably meant now. Thanks.

No problem Alaskan. Good luck.

I'm thinking got to be a long pulsed device to pump a shorter pulsed output rod, I don't think a medical YAG would be used for anything but a pulse, certainly not going to weld anything together

It is hard to say, I first thought pulsed as I saw articles about thuliums being used in ablation. But it doesn't seem to give any reference to pulsed for the diode you have. In that case, we have no idea about its peak pulse power, pulse duration etc. It would help the thermal management, by being pulsed. I'm going to take a look to see if I can find anything else for you.

He has more of them I might buy, that's why I'm trying to get the specs, or figure it out. Thanks, anything you find would be appreciated. I sure wasn't doing well with my earlier searches, couldn't find they were used to pump a rod.

You're welcome, I'll at least give it a shot for you. I figured they probably was used to pump, so I looked that up first.
No description though seems to get any closer to the diode.