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FrozenGate by Avery

574nm 36 mW Yellow Laser

paul1598419 said:
Well, these drivers are definitely Chinese in origin. If he really got them from Europe they had a very circuitous journey to end up in Australia. I tend to believe they all come from China and any theories about a European distributor are just hyperbole.
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Just because he uses chinese drivers does not prove the laser itself came from china.

The lasers maye have come from china. But he did say they were not from Opt Lasers.

I don't recall the name of the European supplier. But when I posted a comment on PL he asked if it was one of theirs. Even if it was a European supplier the crystals could still have come from China.
 
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I suppose if I had a bunch of these lasers and my intention was to sell them for more money than I paid for them, I would deny that they came from the place where everyone could get them for the same price as I did. That is, if I were inclined to make money off of members here by pot modding a bunch of inexpensive lasers then charging 3 to 4 X what I paid for them. I don't treat people here that way. And I have little use for those that do.
 
I have no problems with resellers if they're honest about their suppliers and are not greedy with profit. But this is not the case here, so I agree with Paul.
 
Did I not read mention of an order of 10 pcs?? IF that was what was needed to get attention/service I would have ordered a dozen.. and there was/is a possibility of me needing an order of 100 pcs if that is what it takes-- 50pcs for a forum GB and 50pcs for a local laser seller... but NOT without some samples PLEASE!!

I even went ahead and got two orders of teensy heatsinks (for Raspberry phone afaik) they were cheap and either way will eventually get used, I hope for yellow lab lasers....
 
I remember this thread on PL. Even back then the drivers are the same as Opt Laser uses, though back then the Australian seller was adamant about the drivers not being the same drivers. I don't know anything about the heads as I have never bought from him and the heads could have changed over time as Opt Laser was trying to get enough samples out to everyone who was asking once that cat was out of the bag. It sure seems that any irregularity that may have existed initially is gone now.
 
Just as a heads up - I'm pretty sure everyone here knows not to buy any from Opt right now - until (and if) they ever say they have them in stock again...
I paid Freeman back in the end of May - I think it was likely about a week after Paul put his review up - and shortly thereafter asked Freeman for status on shipping - only to find out the 2-3 days 1st promised was going to be a while longer. A few more emails after that (I usually give a 2 week period before asking for an update), and I finally said "If there is no ETA at this point, I'd like refund". Only to be told this:

I's so sorry about that. I never thought it would delay such a long time. But they are really unable to provide us the applicable crystal at the moment.
But please trust me, we're still always keep them pushed. So please give us some more time.

The $60 for that laser is not so much, we still prefer to send you the ordered unit but not refunding. And hope you understand that it's a bit complecated for me to apply the refund from our accounting dept.
I will be grateful so much if you will be with me waiting for the available new laser.
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Not so sure about not just promptly processing a refund. He's been pretty transparent with me up to this point. I am not too upset, as I trust I'll get it back eventually or finally get a laser, but I could be using that money on other expensive projects at the moment.

The world seems to work things like this out on its own, most of the time. I think most people are honest, and try to give everyone the benefit of the doubt. Hopefully he's not holding onto lots of peoples' money like this...
 
Well, I may have paid 'too much' but I'm glad I got the one I did from Nexgen. Bright single mode beam and both the module and driver barely get warm. I've got about 6 hours on it now and I'm not noticing any drop in power........yet.

I'm wondering though if someone would be so kind as to spectro' one of these into the IR. I suspect there may not be any IR filter in there other that the HR/AR coatings. Wondering how much pump and how much fundamental make it out through the lens.
 
WizardG said:
Well, I may have paid 'too much' but I'm glad I got the one I did from Nexgen. Bright single mode beam and both the module and driver barely get warm. I've got about 6 hours on it now and I'm not noticing any drop in power........yet.

I'm wondering though if someone would be so kind as to spectro' one of these into the IR. I suspect there may not be any IR filter in there other that the HR/AR coatings. Wondering how much pump and how much fundamental make it out through the lens.
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It’s 2W 976-980nm diode. They do not have IR filter so keep in mind that. At least leak is not huge and stays around 10-15mW. :wave:
I have a spare crystal from one unit and 4W 980nm IR LD. Must have to experiment.

I can try TEC cooling crystal, but it’s small and requires additional brass plates.
 
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Nexgen said:
It’s 2W 976-980nm diode. They do not have IR filter so keep in mind that. At least leak is not huge and stays around 10-15mW. :wave:
I have a spare crystal from one unit and 4W 980nm IR LD. Must have to experiment.

I can try TEC cooling crystal, but it’s small and requires additional brass plates.
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Does that 10-15mW figure include both the pump frequency and the fundamental of the crystal, presumably ~1150nm?
 
Nexgen said:
It’s 2W 976-980nm diode. They do not have IR filter so keep in mind that. At least leak is not huge and stays around 10-15mW. :wave:
I have a spare crystal from one unit and 4W 980nm IR LD. Must have to experiment.

I can try TEC cooling crystal, but it’s small and requires additional brass plates.
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That could be an interesting experiment. You wouldn't need to drive it full out, so you could get by without a TEC. If these are SFD crystals, you should get close to the 589nm Na line out. It would be worth it to try, IMHO.
 
paul1598419 said:
That could be an interesting experiment. You wouldn't need to drive it full out, so you could get by without a TEC. If these are SFD crystals, you should get close to the 589nm Na line out. It would be worth it to try, IMHO.
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How do you figure we'd be able to get the sodium line outta these crystals? The pump they come with is already 980ish so wouldn't we just see more of the same 565/575 they already deliver?
 
It would depend on the SFD crystal used as I had just read a paper on a 529nm that was pumped with 1064nm. It was my understanding that the 575nm crystals were pumped at a lower near IR than 980nm, so it was a guess at what might come out at the higher WL. Since we still have no idea what these crystals are made of, it was just hypothetical.
 
paul1598419 said:
It would depend on the SFD crystal used as I had just read a paper on a 529nm that was pumped with 1064nm. It was my understanding that the 575nm crystals were pumped at a lower near IR than 980nm, so it was a guess at what might come out at the higher WL. Since we still have no idea what these crystals are made of, it was just hypothetical.
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It would definitely help if we knew the composition of these new crystals!

From earlier posts I thought the original pump for these was 976nm. 980 might be close enough, or might get an entirely different line out the business end. I'm thinking though that the coatings on the crystal are probably pretty narrow band, so even if we saw a different line the efficiency would be disappointing.

However, if we could tease a few more lines out of one of these it would be very helpful in figuring out what the crystal is made of.
 
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Yeah, with the shipping you are looking at two and a half times what I paid for mine and the shipping on it was more than the cost of the laser. But, I got it in less than four days from mainland China and was much less than the Australian wants to ship his laser out.
 
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