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FrozenGate by Avery

591nm Yellow Laser






I did not measure the output i have to organize the closed i got it on ebay it's very nice color i will think it's around maybe 50+mW
 
If you get a chance to measure the output power I'd be interested in knowing that. If you don't mind, how much did you pay for it? Do you have a link?
 
I get confused on these yellows 589 591 593 594. Without seeing or measuring I don’t think you can really know from a picture. Still pretty good color.
 
kecked said:
I get confused on these yellows 589 591 593 594. Without seeing or measuring I don’t think you can really know from a picture. Still pretty good color.
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There should be no confusion. There are only two wavelengths in reality. 589nm and 593.5nm. 593.5nm (594nm) is noticeably more orange in colour vs 589nm. Both are SFG (Sum Frequency Generation) DPSS lasers.
589nm uses the 1064nm+1319nm lines of Nd:YAG. 1/((1/1064)+(1/1319))=588.93nm
593.5nm uses the 1064nm+1342nm lines of Nd:YVO4. 1/((1/1064)+(1/1342))=593.47nm.

The 589nm modules are simply 589nm modules. 591/593/594's are all 593.5nm modules. Verifiable by tech and by spectrometer.

Both of these DPSS technologies have been around for a long time now. But they've always been expensive and low efficiency.
The irony is; out of the two, 589's were most accessible and cheaper for a long time. 593.5's actually dried up and some members regretted ever giving up or never buying a 593.5 at the time. Me included. It took for me to have a lucky auction of eBay for me to get hold of a 593.5nm labby from a Russian.

Now the 589's are rare and expensive. Yet we have cheap 593.5's suddenly available. Despite the fact that these were the most expensive, least efficient, and most unstable out of the two.
 
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That was helpful thank you. I wonder if the transitions are that tight or if you can temp tune the sum difference frequencies. I have tried sum difference only once and it failed.
 
kecked said:
That was helpful thank you. I wonder if the transitions are that tight or if you can temp tune the sum difference frequencies. I have tried sum difference only once and it failed.
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Temperature tuning won't work with these SFG's unfortunately. It's because the mechanism still relies on a double crystal setup. One solid state medium and then the harmonic medium. This means the lasing crystal is the regulator. It only is going to produce wavelengths according to its emission lines. Temperature can affect semiconductors in this way, but this actually has a negative affect on DPSS lasers. Because the solid state crystal is after a narrow absorption band so the diode shifting can reduce the efficiency. DPSS lasers can be used alongside gas lasers to calibrate spectrometers because of their non wavelength shifting exact lines. There are new types of solid state lasers called SFD (Self Frequency Doubling) lasers. These are single crystal setups that as the name suggests they self double themselves without the need for a harmonic crystal. Another more unusual feature of these are their emission lines aren't as narrow. In fact they can have bands which are most likely tuned by optics rather than thermal tuning. Again, once these lase a wavelength, I have not noticed wavelength shift under different operating temperatures. Probably because they rely on the same diode pumping mechanism as other DPSS's by definition. Examples of these SFD DPSS lasers are the mysterious cheap 565/575's that popped up years ago. And now the cheap 555-561nm, and 571-574nm modules that exist now. Which answers your question marked laser in your signature.

To change a DPSS wavelength you need to cancel out the dominant line and have optics specially designed to add gain to the laser cavity using the weaker lines. Some defected DPSS's have been known to exist with some people here lucky to own one which are multiline. So multiple lines are lasing and being doubled and summed. If you own a 593.5nm laser you will quite often see 532nm emission first before seeing the 593.5nm line. This I have found to be temperature dependent, but also depends the battery level.
 
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