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FrozenGate by Avery

574nm 36 mW Yellow Laser

kecked said:
On pl freeman posted they ar3 having problems with their lase4s loosing power over time due to bad crystals. This is why they didn’t ship yet and he’s begging we have patience while they solve it. It’s just the current batch of crystals not all of them. I noticed this myself. First time I turned mine on it was a blowtorch. Now a softe4 but nice glow. I could see the beam in direct sunlight and now not.
Click to expand...

Yes is old news already.

We have three recent confirmations of independent communications from Freeman citing production problems with low cost, mass or any production of OPT 575nm lasers due to unstable output.
Post #414, #421,#439 and now this one #479
 
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I just want to know what the crystals are. It would be highly helpful to know.
 
CurtisOliver said:
I just want to know what the crystals are. It would be highly helpful to know.
Click to expand...


Exactly, you and everyone else and the pump diode as well.

Then there would be a chance of making much higher quality module/professional level module, however, something tells me it is not that simple or it would have already been done many times over already. There may be several problems short and long term associated with the crystal OPT is using amongst them the stability problem we are seeing now that OPT reports and they not a viable crystal for use in anything but low quality, low cost items like OPT's garden lights.
Remains to be seen what is what when we do.

There are probably real reasons why CNI 577nm lasers are $3800 for 10mW to $9600 for 500mW, retail price--see: https://www.ultralasers.com/lasers-series.php?cat=211

See lab grade 577nm lasers available from CNI here: http://www.cnilaser.com/Yellow-Laser-577nm.htm

Someone could question CNI about supplying crystals for low cost laser modules--ask if they make or know of anything made for that purpose I suppose. They would be able to give an educated guess with all the fingers they have in the laser business including crystal making.
See: Laser crytals, Nd:yvo4, Nd:yag, Nd:gdvo4, Yb:yag, diffusion bonding crystals.
 
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I offered in another thread to run Raman, X-ray diffraction, on the failing crystals. Could run sem too. I’m interested to see if the doping is migrating, simple threshold failure, lattice deformation, and most of all the raman shifts. This could also be facet destruction. Tha5 is massive power for the result. Very inefficient. I think they are on the edge of the pump region. Never the less 3xciting times. It will be solved. Indium foil.....to start! I’d pay much more if they need to increase price for it to work. 100.00 for stable 100mw would be fine. Cheap is not always better. Curiously my 565is stable.
 
kecked said:
I offered in another thread to run Raman, X-ray diffraction, on the failing crystals. Could run sem too. I’m interested to see if the doping is migrating, simple threshold failure, lattice deformation, and most of all the raman shifts. This could also be facet destruction. Tha5 is massive power for the result. Very inefficient. I think they are on the edge of the pump region. Never the less 3xciting times. It will be solved. Indium foil.....to start! I’d pay much more if they need to increase price for it to work. 100.00 for stable 100mw would be fine. Cheap is not always better. Curiously my 565is stable.
Click to expand...

Excellent points. +rep when I can
 
I got one of the early 575nm lasers that OPT had to offer. It has been a very stable 574nm over as long as a 10 minute run while watching it on my spectrometer. Even after increasing the pump power considerably, it is still just as stable as it was when it first arrived. It is anyone's guess what problems they are having with this new batch of crystals, but the laser itself, with a good crystal, is a very stable laser at powers up to 50 to 60 mW with the current pump diode. I have taken the time to examine the beam profile and it appears to be TEM00 mode regardless of the power output. I'm not sure which lasers were having problems with the transverse modes and additional lines that should not be there as there was the Australian version of these too.
 
I don't think this is completely known. For both lasers what components are visible. We know each uses a pump diode, crystal and collimating lens. Are there components not mentioned?

Let's start with the 565 nm laser.
 
They look identical. Both 976 pump. I have both but mine are all from Australia but I bet they came from opt. 565 is stable but 575 dropped in power. Now I did change drivers and I didn’t measure current before the change as the driver toasted. I run 1.5a.
When I got it I ran it off a 9v. Which worked but it got rather warm. The beam was temoo and very visible in daylight. When I get a new one I’ll be willing to take this one apart and xrf it. At least I can tell the elements it is mad3 from. Wish I could just buy the crystal and make a nice 1w! Holy Toledo would that be bright. Sure as hell hope no one ever ever ever points this at an aircraft.
 
kecked said:
They look identical. Both 976 pump. I have both but mine are all from Australia but I bet they came from opt. 565 is stable but 575 dropped in power. Now I did change drivers and I didn’t measure current before the change as the driver toasted. I run 1.5a.
When I got it I ran it off a 9v. Which worked but it got rather warm. The beam was temoo and very visible in daylight. When I get a new one I’ll be willing to take this one apart and xrf it. At least I can tell the elements it is mad3 from. Wish I could just buy the crystal and make a nice 1w! Holy Toledo would that be bright. Sure as hell hope no one ever ever ever points this at an aircraft.
Click to expand...

They both look alike tells us nothing. I don't care about the drivers. When you get a new one and take it apart describe all the parts specific to the laser itself. Perhaps with a detailed description of those parts might give clues to how these two lasers work.
 
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I did some testing on my 575nm (from the aussie) changing the driver input voltage with a PSU.

V_in I_in(mA) mW (with IR)
12.6 790 44
12 816 41
11 875 39
10 907 31
9 945 22
8 981 16
7.5 999 13

At 12V about 10mW are IR. So ~31mW at 12V.
The strange thing is that it's drawing more current than the others that were posted and it doesn't seem to be regulating properly (power should be stable after ~9V according to others).

I was thinking of shorting two input rectifiers (each drops around 0.9V) to drive it with 2xLiIon but it will lose too much power.

Mine has no second line. It's not a gaussian TEM00, but it's not an ugly split-beam mode either.
 
It is likely to get one of these crystals large enough to output 1 watt, the entire laser would have to be redesigned. I know Ultimatekaiser has an OPSL 577nm 3 watt laser, but it has a massive TEC cooled heat sink under it and had to be pieced together because he wasn't able to get one turnkey ready to use.
 
this is copypasta for those who have not seen the update 'over-there' -- added 'today'

quote.

lwarn.gif
565nm/575nm yellow laser
Hello guys, a news must to share with you all. And beg for your understanding and a little bit more patience for waiting the orders' shipping.
I lately get flood msgs of request on the delivery. To all the friends who have paid, I NEED YOU TO READ THE UPDATE AS BELOW.

We have been always informed from our partner that they are unable to reach a quality assured crystal for this laser. It happened several times that the laser always get failure of output steadily.
That the reason they do not transfer the crystal for us to do assembly procedures. So there's no a single finished module at my end now. They told us might be able to carry out before next weekend(beginning of July). But not give the certain words. In certain, we have always kept pushing them to move by quick.


Maybe I should not have posted this news so early. As the issue we seen now the delivery date is not undertaking well. I do apoligize again.
May you give us a little more time, and if you know anybody or your friends on our LPF, please kindly let them know this delay, epecially to those who already paid for orders.

cry cry cry<_:
Thank you!
Freeman.

People can obtain the yellow color laser by matching well the red and green combined, because the truly single wavelength of yellow laser has been at high cost for a long time.
It's the time to break now, here we go a single chip of 565nm/575nm truly yellow only laser, carried out, but a pity that power range only 25-30mW for now.
https://drive.google.com/open?id=1xZ...12y0ww8_k9wB0l

Anybody get interested, just shoot message for inquiry offers.

I will make a clarification here:
To avoid flood confused messages on the laser--

1. 565nm individual wavelength which closes to orange; 575nm another individual, better yellow laser wavelength. Both available.

2. Both, we checked already, show that power loss a lot from original diode 30mW. You will get only 17mW to 25mW(max) in the end.
Here with some pics of the lasers hit powermeter checking.
https://drive.google.com/open?id=1a1...i-rynci3GXHUsM
https://drive.google.com/open?id=1ts...KaAbIRc2KsH3wC
https://drive.google.com/open?id=1Pj...K8gQYYiqp2K0IN
https://drive.google.com/open?id=1Ex...rpO81KGp6cRdHI

4. Suggested TTL modulated on the laser, cuz analogue may lossly a bit more to use the laser efficency.

If you would think these final output still meet any of your applications, then message detailed demands, ,,qty, delivery add, etc.

Will carry higher power 300mW or 500mW, but still in searching, not available at the moment.

Cheers.

Cheers.​
Last edited by MagicL520; Today at 04:03. Reason: Updates for delivery​
With all the best,
Freeman.___________

______________

NOT 'old news' to everyone.. hak
​
 
hakzaw1 said:
quote.

lwarn.gif
565nm/575nm yellow laser
Hello guys, a news must to share with you all. And beg for your understanding and a little bit more patience for waiting the orders' shipping.
I lately get flood msgs of request on the delivery. To all the friends who have paid, I NEED YOU TO READ THE UPDATE AS BELOW.

We have been always informed from our partner that they are unable to reach a quality assured crystal for this laser. It happened several times that the laser always get failure of output steadily.
That the reason they do not transfer the crystal for us to do assembly procedures. So there's no a single finished module at my end now. They told us might be able to carry out before next weekend(beginning of July). But not give the certain words. In certain, we have always kept pushing them to move by quick.


Maybe I should not have posted this news so early. As the issue we seen now the delivery date is not undertaking well. I do apoligize again.
May you give us a little more time, and if you know anybody or your friends on our LPF, please kindly let them know this delay, epecially to those who already paid for orders.

cry cry cry<_:
Thank you!
Freeman.

People can obtain the yellow color laser by matching well the red and green combined, because the truly single wavelength of yellow laser has been at high cost for a long time.
It's the time to break now, here we go a single chip of 565nm/575nm truly yellow only laser, carried out, but a pity that power range only 25-30mW for now.
https://drive.google.com/open?id=1xZ...12y0ww8_k9wB0l

Anybody get interested, just shoot message for inquiry offers.

I will make a clarification here:
To avoid flood confused messages on the laser--

1. 565nm individual wavelength which closes to orange; 575nm another individual, better yellow laser wavelength. Both available.

2. Both, we checked already, show that power loss a lot from original diode 30mW. You will get only 17mW to 25mW(max) in the end.
Here with some pics of the lasers hit powermeter checking.
https://drive.google.com/open?id=1a1...i-rynci3GXHUsM
https://drive.google.com/open?id=1ts...KaAbIRc2KsH3wC
https://drive.google.com/open?id=1Pj...K8gQYYiqp2K0IN
https://drive.google.com/open?id=1Ex...rpO81KGp6cRdHI

4. Suggested TTL modulated on the laser, cuz analogue may lossly a bit more to use the laser efficency.

If you would think these final output still meet any of your applications, then message detailed demands, ,,qty, delivery add, etc.

Will carry higher power 300mW or 500mW, but still in searching, not available at the moment.

Cheers.

Cheers.​
Last edited by MagicL520; Today at 04:03. Reason: Updates for delivery​
With all the best,
Freeman.___________

______________

NOT 'old news' to everyone.. hak
​
Click to expand...

Thanks for the additional confirmation and details + some Freeman photo links concerning of what has been noted here as "the word" from Freeman several times.

We have four recent LPF confirmations via independent communications with Freeman citing production problems with low cost, mass or any production of OPT 575nm lasers due to unstable output caused by what appears to be crystal production problems
Post #414, #421,#439, #479 and now this one #493---
so as of today LPF has 5 independent confirmations of crystal problems from Freeman.
 
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Thanks for the update, Len. I currently am not waiting for one, but any news updates for those that are, I'm sure are welcome.
 
I was very fast ordering since paul showed up with one, I'm in no rush for it as it's a collectors item. As soon as I get it ill let you know, ordered a month ago + express.
 
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