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The longer focal length, the smaller the NA and the bigger the laser spot so smaller power density

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I'm looking for a few parts for my new projects, if anyone's willing to sell anything from the list feel free to contact me: thin etalons. Anything sub 1 mm really. I'm looking for few visible wavelengths, but because most etalons don't have/need coatings, almost all will work as long as...

This time I decided to reduce linewidth and improve stability and tunability. At first, I doubled pump power by combining two diodes using PBS and stabilized their temperature to peak absorption using peltier modules. Then I inserted BFT into the resonator in hopes of jumping between colors...

I'm curious why red uses 3 wavelengths.

You can't call it laser POINTER if it can't point as it's invisible. There's really good reason there're no 808nm laser pointers for sale. Because they're perfect way to hurt someone and if you know enough to handle one you also know that you can build it in <1h. RE temperature: There are also...

"Classes" laser power is defined over certain aperture. Maybe it's enough for you to enclose the beam in device for long enough that it spreads to 6/5 of aperture

Thanks, will try contacting them

Hi, so in this thread op37 documented his journey with getting nice side pumped Nd crystals bonded to Q switch. Unfortunately, he seems long gone from the forum. Does anyone has crystals like that one for sale or knows where I could find one?

Would you be willing to sell any of this crystals?

Unlikely we'll get vis fiber sources in the near future. As far as I know the only one actively experimented on is green from Er3+ fibers. Nonlinear conversion in OPOs/OPAs is just too simple to bother implementing custom wavelengths anymore. I don't think I know any lab that has any modern...

because it'd make "white" light from only green and red parts. Kr/Ar has more lines, that better covers whole spectrum

Depends how much you spread the beam. PBS can be used to combine kW beams if they have low enough power density

For me personally power isn't that important, 70mW is plenty and new wavelengths are really nice

You're aware you just shared perfect list for scammers to let them know it's time to create new account?

I'm curious how exactly he added external etalon to it.

Random research I pulled out suggests that CMOS sensors die around 0.4J/cm^2 for ns pulses and 0.02J/cm^2 for ps pulses. That's low enough to illuminate the entire drone with one, powerful pulse.

Why waste helium instead of using hydrogen? Bonus points for higher velocity/pressure

You most certainly can't disable a drone with any reasonable laser (exceptions: look at US military lasers) so I shouldn't be braking the rules. To things that come to my mind: hundred+ J Q-switched pulse to hopefully fry all photosensitive devices on drone like cameras 100+W quasi-CW laser...