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Every lasee diode have multiple peaks within its spectral width. In GaN diodes tjeey are separated by >0.1 nm. Herw a picture of a 488nm from the Thorlabs website: The amplitude of these peaks changes with time, pressure, temperature and so on. Ocean optics also shows this on their website...

Do you know how they measure and define the wave length? Laser diodes emit all internal modes in a 1-2nm wide band. The strength of every mode depends on many factors and changes with time. Do they perform a fit to the data? If yes, than what kind of fit and to what kind of data? Here two 495nm...

You are welcome. I received a lot from this forum and it's members so I just try to give some value back to them. 100mA (~45mW output power) and a heatsink temperature of 25°C. I will open a sell thread soon, when I measuremed them all and decided which one I will keep for myself. I don't...

As for all GaN diodes it is around 1nm per 200mA (if the extra heat is effectivly removed) and ~1nm per 20°K. At some point the this relation becomes nonlinear (when the thermal rollover starts) and is usually higher but also a sign that you close to kill the diode. Without a proper heatsink...

Thank you Paul. I already new from some companies that override them big time that these GaN diode lasers can take a much higher current than the GaAs diodes (don't really get why but I will find out soon). Seems like their thermal conductance is much better..? I think the max ratings are really...

So. Today I did the PIV measurements with a TEC stabilized mount and one with TEC turned off (it wasstill mounted to an optical Table but a TEC is a pretty good thermal isolator). Here the results: First with the TEC turned on and stabilzed to 25°C Pretty impressive for my planned...

I allways use a tec controlled diode mount for my measuremts, but I can also use a passive heatsink afterwards as a comparisson in power and wl change. Singlemode

I don't really need to. I was able to pull the 494nm diode up to 499nm with grating feedback and I am really need only 497nm max. So these diodes are what I was looking for! Singlemode

So, today I binned the first 10 diodes from my order of 20. I performed a fit to a Lorentzian distribution (first value) and an extreme peak function (second value). Here the results: | 493.9nm | 493.8nm | | 493.9nm | 493.8nm | | 494.7nm | 494.5nm | | 494.4nm | 494.1nm |...

Experimentally = measure it! Singlemode Ps: my answer is a consequence of your question. Ask better, get better answers

It is very interesting that the rumors of sharp aiming to produce 488nm on a large scale are around for many months now. But they officially released 505nm and 495nm on their website. Ether they produce a ton of diodes every time they change their parameters to look for 488nm or they have...

The last diode of the 5 Paul tested so far is >495nm :) But I am also looking like you fpr 495nm or higher for scientific purposes. Do you have a link or two? Singlemode

I am sure you can push them up to 3 nm with current/temperature. On the side of the spectrum you have the 501/502nm from sharp. What WL are you looking for? Singlemode

I have a remote controllable Current driver/TEC controller combination. Never used the included script language for ramp generation though, just the basic functions. If it will take to long to understand it, I will make a curve by hand :) Singlemode

Thanks Paul! fnaly real 495nm diodes! Mine will arrive tomorrow but I won't be able to test them before the weekend. Can't wait to cherry pick them :). I can also test the wl shift based on current and temperature independently with a temperate controlled mount. Current wise I can even look...

Wow paul, that went very fast. Were the diodes beamed to you :) ? Please share your results of at least one diode, so we know of it is a real 495nm one! Mine will arrive in some days and I hate waiting so much. Singlemode

Yeah, I am exited like a child at Christmas. These new ones are exactly at the WL what I want for my lab setup and I already started writing a paper draft involving a laser system based on them. I plan to add some members of this forum into the acknowledgments ;) Singlemode PS: The link...

According to this specsheet: https://www.thorlabs.com/drawings/bfc8d6636698521a-38E0B409-E7FC-1AEB-11016E9DED880949/DJ532-40-SpecSheet.pdf +/- 1nm is within the specs. Singlemode

Like Paul nicely explained, using a fibre is one key ingredient for consistent measurement since the fibre decouples the optical adjustment inside the spectrometer. The second one is a calibration with a known light source. It should be another stable laser or a calibration lamp (<100$ on ebay)...

Has somebody any information about their wl? Singlemode