Can someone tell me the technical difference between OPSL (Optically Pumped Semiconductor Lasers) and DPSS ('Diode-Pumped Solid-State) lasers?
thanks.
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Can someone tell me the technical difference between OPSL (Optically Pumped Semiconductor Lasers) and DPSS ('Diode-Pumped Solid-State) lasers?
thanks.
I think OPSL would refer to lasers like ruby, dye lasers etc, which just use a regular, non-coherent light source to pump them, whereas DPSS is pumped with 808nm coherent light from a laser diode.
http://www.laserfocusworld.com/vloc/...al-application
That's an article that explains OPS lasers. Refer to Wikipedia or other sources for explanation of DPSS lasers.
Bedankt voor de link Jeroen.
If inderstand correct, OPS Lasers got better beamspecs, are smaller, longer lifetime, higer power, and can create more colors.
Does someone got some pricing on this OPS lasers?
Ask Hugo (or send an e-mail to Light-line.de , that company is the certified Coherent system integrator which supplies Hugo.. You can't buy them direct from Coherent, the driver/TEC has to be made by the system integrator).
Don't fall over backwards when you hear the price :)
Can you give us an idea of the price? I'm curious, but not curious enough to write a mail...
As for the difference between OPSL and DPSSL, it's mainly that in DPSS you pump (excite) lanthanide ions in a glass matrix to get them to lase at a higher wavelength. In the case of OPSL you pump a carefully engineered semiconductor instead.
OPSL is more flexible, as it's easier to change the emission spectrum of a semiconductor and their absorption is much wider. A simplified picture is to think of it as a solar cell and laser diode in the same package.
Technically it's more like a solar cell and a quantum dot laser in the same package. Quantum wells are cool. :)Quote:
Originally Posted by tocket
Those SDL MOPA lasers are OPSL correct? I got one that daedal is trying to see if it works.
mopa is master oscillator power amplifier.
So you have a little red diode with nice beam quality, because you can get good beam quality in a small weak diode that you can not get with high power. Then you have a second diode die that is the power amplifer. The beam from the nice quality diode goes into the power amplifier, in your case does a single pass through and comes out with a lot, lot more power. Its a expensive way of solving the red problem. With the issue of having to make the dies track each other in wavelength across a wide range of temperatures.
Steve
in the tens of thousands for a few watts
Quote:
Originally Posted by aijii
OR,,,,,,,, $99.95 on Ebay in 2015. :D
Rattle, rattle, I'm waking the dead, this is an old thread.Quote:
Originally Posted by 300EVIL
Too bad that link to Laser Focus World no longer works, I've been googling trying to find how an OPSL works, I mean, in regard to the pump wavelength. It occurred to me my 577 nm OPSL probably isn't being pumped by 1154 nm, as I was told by the seller, or more likely I just misunderstood him and he was talking about the wavelength into the LBO crystal. I mean why use OPSL if you can just double the wavelength of 1154 to produce 577?
Edit: Of course, when I post this I soon after find the new link: https://www.laserfocusworld.com/lase...mplaser-market
Although after reading, I still don't understand what wavelength the IR pump is at in the 577 nm OPSL.
Get in touch with Daniel Briggs. He's not often here on PL anymore, but I think he is active on Facebook. (Ugh - I know...)
Dan has resurrected several high-power OPSL lasers. I'm sure he can point you in the right direction for a proper pump diode.
Adam
Thanks, damn, I hate what FB does anymore so dumped that account two years ago. I will see what I can do to track him down, but really, I just need to know what the common pump diode wavelength is for 577 nm. I'm missing that key point of information to have a basic idea how OPSL lasers work.
Yeah, I hear you. I gave up Facebook several years ago myself. Best decision ever!
Admittedly my knowledge of OPSL is quite limited, but I thought that the gain medium (that is, the quantum well source of IR that is frequency-doubled to produce the output) operates in a similar manner to a standard DPSS laser, in that it accepts a near IR pump wavelength (805-808 nm) and outputs slightly longer IR at 900-1200 nm.
The magic of OPSL is that the IR output wavelength of that quantum well can be tuned to a very precise wavelength target, so that when you frequency-double it you get whatever visible color you are looking for.
So for 577 nm yellow, the IR output of the quantum well would be tuned to 1154nm.
But I'm pretty sure the pump diode would still be the standard 808 nm IR... At least, that's the way I understood those lasers. But again - I'm no expert!
I sent a PM to Dan; hopefully he'll get an email alert and join in the discussion here.
Adam
Someone had told me a 808 nm diode was used, but I didn't believe them after getting conflicting information from someone else, or more likely, I just misunderstood them. So this is very good news, 808 nm, of course, are plentiful on the surplus market and I already have some new old stock ones in C-Mount which put out up to 16 watts.
it’s 808nm. Found this out when those little greens were around.Quote:
Originally Posted by Laser57
... I have several 808nm-multi-bar-diodes, bundled or focussed on an FSMA-connector - 25Watts on a 0,7mm fiber-output and a 300W(?) module on 0,4mm ... but mostly using 975nm-diodes for "material processing", not for pumping (but all my fiber-lasers uses 975nm pumping diodes) ...
Viktor
I've been buying 808 modules off of ebay for a few years off and on, have a few good ones now, up to 50 watts which were used in a Coherent 532 nm laser as well as some c-mount 808 nm diodes, so I'm happy to see this :)
Attachment 58897
Shooting IR into the night sky in Alaska.
Photo of the collimated output of one of the FAP 808 nm multiple fiber output modules using a 2 VDC Cyclon battery as the DC supply. I did this only once, not a good idea to be playing with IR outside. I made sure no one was around and didn't point at anything more than the top of a tree. Just 3 minutes, then put it away. Of course, the camera had the IR filter removed to be able to pick it up.
where you are at you might get something nasty sent your way thinking someone was painting you.Quote:
Originally Posted by Laser57
... yes! - even if the 808nm-beam is (mostly) invisible for the human eye (I can see a dim "red" if enough energy density), digital cameras or web-cams will see it perfect (as seen in your image), so could provoke some nasty questions or more :rolleyes:
I've done some of my tests with 975nm-beams in the backyard only, so none involved :cool:
How is your diode module in the image "organized"? -- have some diodes with 19 single emitters "bundled" into a 0,7mm fiber-output (similar to your image) ... or "pregrouped" in 5x7 into a quadrate, what's pretty good visible in the "far field" or widened beams ...
Viktor
Hi!Quote:
Originally Posted by Laser57
I got Adam's message to come and have a look.
You're mostly correct; the output 577nm is frequency doubled from 1154nm. This IR wavelength will of course vary from whatever the output wavelength. I think it's possible to do in OPSL:
460nm, 480nm, 488nm, 514nm, 532nm, 561nm, 577nm, 590nm, 607nm and 639nm
There are other IR and UV ones too. (Frequency tripled, and undoubled ones 1154nm, 1064nm, 920nm etc.)
607nm and 639nm are exceptions from "normal" OPSL's in that they are actually blue output OPSL's pumping another cavity bolted onto the end, Pr:YLF, to convert the blue light to 607nm (orange) or 639nm (red). That's what's in the little bolt on "nozzle" on the end of it.
So for 577nm you'd actually be going: 808nm -> 1154nm -> 577nm
And for 639nm you'd be going: 808nm -> 920nm -> 460nm -> 639nm
The corresponding undoubled IR orginal wavelengths are created from the specific design of the OPS chip. They are essentially designed to have a variety of deposited layers to create a useable IR laser for a specific wavelength. This range is about 700-1200nm. If you want 1154nm? You design an OPS chip for that. You want 920nm? You design a chip for that etc. Then stick in a frequency doubler to get your visible wavelength.
So you can pretty much pick any wavelength it's worth throwing R&D money at to warrant the costs. That's why most of the OPSL's you can buy happen to be at useful wavelenths for processes, or identical to power hungry argons they would be replacing etc.
However: you're absolutely stuck to the wavelength you have for the OPS chip you've got; there's no tunability on the ouptut wavelength.
There is a birefringent and LBO you can tune, but this will not alter the output wavelength.
ALL OPSL's are 808nm pump; but the spot size and geometry is important for proper beam profiles.
If you have one there, you should get some light out around 12-16A on the diode. Most high power Taipans will output their nameplate rating when ideally tuned and healthy around the 30-36A. Do not exceed 40A. This is the absolute max for the diodes.
There's a lot more to it, and I've omitted many many details, but hopefully the above is what you need to know?
I think I have some 577nm OPS chips in my collection if your one is dead. They are literally hen's teeth though :) *warn
If it's a pump diode that is dead... that is not the usual failure mode unless it has many 1000's of hours on the clock or a badly set driver.
All the best,
Dan
well, I pointed into the sky very briefly making sure no aircraft, not that it would cause a problem unless pointing at a law enforcement craft which could detect it. It was in the middle of nowhere Alaska.Quote:
Originally Posted by kecked
Yes, I can see the beam visually too, but only if pointed at something close, I see nothing pointed into the sky by eye. My camera had the IR filter removed, so the beam would be visible, with the filter in place, my camera wasn't sensitive enough to see the beam at all. Now, night vision cameras would pick it up for sure, since they don't block IR. The beams were 19 single emitters bundled together, I wanted to see what the beam from all of them would look like into the night sky, that's why I took the photo. The mRad was close to 16, as best I could tell measuring the spot size inside my apartment at a given distance, that's wide, and why at distance, there isn't enough power to cause anyone a problem. Although close up it can, that is why I made sure no one was about where I was doing the photo and only for a few seconds up high into the sky.Quote:
Originally Posted by VDX
Dan, thank you so much for helping me understand, with your response I have a basic understanding of how they work now. I don't know if it is the OPS chip or not in my 577 units, I hope not, as you are telling me, they are far and few between, if ever, to find one. If you were to sell one, I'd be interested just to have it as a worst case repair. I don't know when I will get to troubleshooting my 5 watt 577 nm unit, it might be awhile.Quote:
Originally Posted by danielbriggs
Are the OPS chips all the same power output capability if pumped hard enough by a laser diode, or vary between the different power output rated heads? I'm more active on a less active forum, if you want to contact me there, we would be happy to have one more member, even if a single post. Right now there are only three of us who are active over there. Here's a thread I started on this same subject: Coherent Genesis Taipan 577 nm Optically Pumped Semiconductor Laser (OPSL) - Lasers - Laser Discourse
Chris
Guys, forgive me for three posts one after the other, but I wanted to answer the responses separately, I didn't know they were waiting for me to see until today.
... if you're searching more infos about laser-diodes and "internas" - here I've uploaded images of some of my diodes (and other relevant infos):
https://reprap.org/wiki/Laser_Cutter_Notes
Have much more, but don't update this wiki regularly (could be, lost interest) ...
Viktor