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FrozenGate by Avery

565nm DPSS labby

Good for you, Chris. Mine is going out by DHL as we speak. Likely the best deal on a laser I ever got. Might have to buy several if I can figure out exactly what they are doing. Worth $30.00 just for the xtal(s).
 





On mine lasing started at 561.1 and slowly shifted to about 565 when warmed up. Its very coherent, and had a beautiful transverse mode. So it has a gain bandwidth of at least 5 nm. I sold it, and ordered a 575 immediately, so was in no hurry to reverse engineer it. I did see one discrete wavelength hop during warmup, then it continued to slide.

Keep in mind that some solid state materials (ND:YLF as example) have as much as fifty nanometers of gain bandwidth, so don't assume it is a direct diode just because of the wide shift. Also do not assume a Type I doubler would need such tight phase matching or retuning over a wide bandwidth. Type II, maybe, but not always for Type I.

I simply did not feel like tearing down a 180$ stable laser with very clean modulation, doing that much power.
Mine was screaming hot, at least 50 mw. Pricing is all over the place, btw..

I'll do much more detailed testing when the 575s get here.. Answer, we don't know till some one pops one open. Even then there will be questions.

Steve
 
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I ordered one from our Aussie buddy but he cannot send DHL to me, since I am on a base in Qatar, it will have to go to the US into the military mail forwarding system, then back over to me here.
 
LSRFAQ said:
On mine lasing started at 561.1 and slowly shifted to about 565 when warmed up. Its very coherent, and had a beautiful transverse mode. So it has a gain bandwidth of at least 5 nm. I sold it, and ordered a 575 immediately, so was in no hurry to reverse engineer it. I did see one discrete wavelength hop during warmup, then it continued to slide.

Keep in mind that some solid state materials (ND:YLF as example) have as much as fifty nanometers of gain bandwidth, so don't assume it is a direct diode just because of the wide shift. Also do not assume a Type I doubler would need such tight phase matching or retuning over a wide bandwidth. Type II, maybe, but not always for Type I.

I simply did not feel like tearing down a 180$ stable laser with very clean modulation, doing that much power.
Mine was screaming hot, at least 50 mw. Pricing is all over the place, btw..

I'll do much more detailed testing when the 575s get here.. Answer, we don't know till some one pops one open. Even then there will be questions.

Steve
Click to expand...


That's interesting. I found a cheap 532nm DPSS laser that runs on AA batteries would creep up in wavelength. I thought it was very strange until a guy in CA found the same thing with an identical laser. I reported it several years ago, but because I couldn't explain why it was happening, I was not believed. You could watch it move up slowly in wavelength on the spectrometer. I still have it tucked away with two others that have 4 lines and 6 lines respectively.


Chris, you didn't buy the one from Shenzhen Optlaser Tech? Mine is going out by DHL tonight and I should have it within a week. My total cost was $65.00.
 
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paul1598419 said:
It is difficult, but not impossible. Diachi linked a 488nm laser done this way by Lazeerer. That was from 2013 IIRC.

Yes, it was a Melles Griot direct diode 976nm duobled to 488nm. Here's the link: https://laserpointerforums.com/f40/488nm-direct-double-mg-lab-laser-system-85658.html.
Click to expand...

That's an amazing piece of work, but also requires TEC control to keep both the laser and the crystal to a very precise temperature at all. The pump diode also is a single mode one that operates at pretty high power levels.

This is vastly different from what is proposed to be offered here: there seems to be NO temperature control for either laser diode or crystal. Also the price point is a few orders of magnitude below the melles-griot solution, though that doesn't say it's impossible to achieve.

I guess the only way to figure this thing out is to actually get one and take it to bits. Perhaps it does use a different chemistry for the solid state laser making this possible, which to me seems more likely that actually directly double the output from a diode at this point.

Apart from spectroscopy the only way to tell would be taking out that 'crystal' and putting it under the microscope to see if it's actually "just" and doubler, or a sandwich of a solid state laser and a doubler with coatings in between.
 
I guess we will know the results soon enough then :)

Are they still available to order? I'd love to have a look at one to see what's actually going on!
 
Mine will be here day after tomorrow. I'm looking forward to putting it on my spectrometer and watching to see if it drifts up in wavelength. I also want to see what they are pumping it with. But, it might be out of range for my spectrometer. I need to also see if pump current will change the output power.
 
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I'll have my 575 friday. I plan to set some time aside to take decent pics of it, that and vs my 565.. I'm hoping the extra ~10nm is enough for my camera to notice it's yellower.
 
Benm said:
That's an amazing piece of work, but also requires TEC control to keep both the laser and the crystal to a very precise temperature at all. The pump diode also is a single mode one that operates at pretty high power levels.

This is vastly different from what is proposed to be offered here: there seems to be NO temperature control for either laser diode or crystal. Also the price point is a few orders of magnitude below the melles-griot solution, though that doesn't say it's impossible to achieve.

I guess the only way to figure this thing out is to actually get one and take it to bits. Perhaps it does use a different chemistry for the solid state laser making this possible, which to me seems more likely that actually directly double the output from a diode at this point.

Apart from spectroscopy the only way to tell would be taking out that 'crystal' and putting it under the microscope to see if it's actually "just" and doubler, or a sandwich of a solid state laser and a doubler with coatings in between.
Click to expand...


Yup, made those points elsewhere. I wasn't posting that link as proof that this is direct doubled, just that direct doubling was possible, due to a miscommunication between Paul and myself.
 
I tried looking for it through "565 nm laser" search query. but didn't find it. I'd like to buy a couple of them to have a volatile exchange fund, for converting them into gas lasers then:yh::yh:
 
You can buy a 565nm or 575nm laser now without going on eBay. If you look for the thread on PhotonLexicon started by MagicL520. He represents a Chinese company that sells these on Alibaba for $30.00 each, plus shipping. You can PM him to get one or both lasers. They ship using DHL so I don't know what the shipping cost might be to you, LaserBuilder.
 
paul1598419 said:
You can buy a 565nm or 575nm laser now without going on eBay. If you look for the thread on PhotonLexicon started by MagicL520. He represents a Chinese company that sells these on Alibaba for $30.00 each, plus shipping. You can PM him to get one or both lasers. They ship using DHL so I don't know what the shipping cost might be to you, LaserBuilder.
Click to expand...

Is Mr.Jimmy Fan the seller?
 
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