Laser diodes are typically +/- 5nm. So a 445, will usually be in anywhere between 440 to 450nm. They are the same technology but won't necessarily be the same laser diode. When it comes to diodes, they can only be taken to 1nm resolution when spectrographed. Diode wavelength also naturally...
I recommend doing some more research into laser wavelengths.
The fact that you didn't know any 473nm diodes existed, then why would you think they would be cheap? They obviously are not common. When things aren't commonly available, it is higher in market price.
Different semiconductor materials...
Yep, this ^^
Efficiency is important for cost per mW. Market demand and ability to be mass produced drives down cost considerably. If there was no market for DPSS 532's they would still be expensive too.
Another thing to note is that common dpss pointers use stock crystals which have the...
I'll answer each question in order.
You are correct that shorter visible wavelengths are least absorbed by water, you could however still use a red and not notice any major effects as water is generally transparent to visible wavelengths. The absorption is most noticed once you...
This is a different dpss process to that of typical 555/556nm lasers.
Edit: It is still possible you may be correct on the crystal, just not the doping. Nd:YCOB exists, but I have seen a patent using Nd:YGG.
I'm putting my bet more on Nd:YGG for the 555nm dpss. Correct pump wavelength.
Nope it is not LiLuF4, well at least not as like in that thread as the pump wavelength is completely wrong.
The pump is 976nm which automatically lends itself to praseodymium doped crystals (Pr:xxx)
And as I just looked up Pr:LiLuF4 I can rule out known visible combinations in the yellow/green...
For me to feel comfortable with any suggestions, I would want to know what the strong desire is to own something so potentially dangerous and have it portable.
NIR/IR part of spectrum would end up being far safer than anything suggested for the NUV/UV wavelengths.
Sounds like they may produce the crystals directly themselves? Can you ask what Crystal they use? We could only speculate. It would be nice to put this to rest and would love to do more research into it. Might open up a rabbit hole