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FrozenGate by Avery

574nm 36 mW Yellow Laser

I happen to have used a dual driver so I can use the second one to drive the fan but I wonder how a driver will react to a voltage driven device. Never tried this. Wasteful but interesting. I will replace the fan with a 5v fan off a dead spectrometer. Looks like a fit. Other idea is put a a little tec on it.

Btw I ordered drivers from place called laserwinkle. Guess what I got....the exact drivers a guy called badpip was selling and then vanished. Nice driver. Im thinking of running my yellow with a 120hz modulation to see if I can see the beam and cut down on heat. For lumia it doesn’t matter if the beam is pulsed.

Themodulation test is in.....jelly bean hell. Not good for graphics use. Fine for beam shows.

Last, I can’t load up pictures here. They are always size rejected. Do I just resize tom800x600?

I put the yellow on the hr2000

The fundamental is 573 the pump has a couple peaks 932 and 976. the 976 is a small peak 8000:100 ratio then there is something wide from the base of the peak to 1100nm 500 counts. it real but maybe off the scalle 1100nm is my end. my bet is the large peak gives the 565 and the small peak the 575.
 
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FYI, on my Aussie 575 nm 35 mw yellow laser, it won't put out any yellow at all below 600 mA current into the diode.
 
Kecked - just upload to imgur or some other hosting site and embed the image here. I'd love to see the graph.

Word in from the Chinese, they are testing a 50mW version now.
 
I don't know what to tell you Paul, if I disconnect the driver from the diode and use a CC power supply to drive the diode without anything in between it, I can keep increasing the current and the beam just keeps getting brighter and brighter, I didn't find the knee at 2.25 amps before I decided not to push it further, the power out was still going up.
 
I wonder if its worth completely replacing the driver that comes with these modules with ordinary laser drivers we usually use. I'd also love to know what these could safely be driven up to and what the output power is.
 
Me too, if I could find out what diode they are using, then I'd know how hard I can drive it, at 2.25 amps the beam became very bright in a lit room, I imagine 75 mw, maybe more. I will be replacing the driver with one I bought from DTR just sitting here waiting :)

Also, I didn't have the fan running, didn't get warm, but I also didn't run it very long. I have a host to put it into with lots of heat sink.
 
That sounds amazing. That would have a glorious yellow beam. I am also suspicious though that these modules and the higher power ones may be the same. If not, it could mean those higher power 575's might be able to go higher too. I really want to get one to try out.
 
By what I found with the Aussie unit, doubling the current increases the power by an estimated 2X, so it very well may be the driver which makes the difference, but what I don't understand is why Paul's 36 mw unit is only drawing half an amp, mine takes twice that to produce that amount of output power.
 
Their range may be selected based on efficiency. Their higher power unit may not be any different at all, but instead they are the more efficient systems. Just a hunch.
Your system is properly aligned I take it? No beam clipping etc. It may simply be the pump diode isn't as efficient as Paul's.
The other thing I can think of is wavelength. As you bring the current up you will be increasing the wavelength. We don't know a lot about the crystal, but at low current your laser diode might not be at optimum wavelength for the crystal.

As we know, all ld's have different central wavelengths and can be higher or lower than average.

If the self doubling crystal is what I think it is, then it is possible that these are being pumped by 980nm diodes.
 
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When I first power the laser up, the output is an oblong beam pattern which I can see what looks like small multiple vertical spotty lines in it, until it has been on for 10+ seconds, then it is too bright to see the pattern but looks more like a round spot. I didn't try to see the spot with laser glasses yet at full output, but the beam looks so much better at 2 amps. I tested again, above 2.25 amps the beam begins to dim, beyond it continues to dim, so I reached the knee. 2 amps is probably far too much, maybe better to run it at 1.75 amps as a WAG, sure would like to know what diode this uses. I have some high power 980 nm fiber lasers I could turn way down and try, if I ever do burn out this diode.
 
Well, I found some info surround Yb doped crystals. And a lot of work has been done on self doubling. It is interesting that you are seeing multimode, as it these Yb lasers can be tuned. It also explain the wide linewidths on the spectros.
The paper shows the crystal being pumped by 975nm, which is more than achievable by 980nm diodes. 980's are also available cheap in relatively high powers making them perfect for these modules. In order to avoid damaging the diode and crystals I would keep it a 1.75a too just in case.
I wonder if anyone would be able to get one just for the crystals.
 
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I have two more modules coming from China, maybe I will tear one of those down to get to the diode and crystal. I need to read up on those crystals.
 
I did replace the driver completely and it really other than being able to drive it off 5v didn't change much. Driver still gets hot just not as fast. 5v is 7-8W vs 12v 12-14w lot less power dissipated.

My unit is not even as bright as my 5mw green pointer at 1.5amps on 5v. I don't have a power meter to test. I am measuring the power the driver and laser consume via my power supply so I think I am way low. I'll have to cut the wire and measure the actual current to the diode.


Next I'll toss the 565nm laser on the spec and see what the diode says on the pump. I bet the same and they just move the crystal to change the output.
 
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