Can I change this green laser to blue point laser? Do I need

>>278812
no, the wavelength (color) of the laser cannot change

you can either get a color filter (maybe)
or just buy a blue laser

you would need to replace the resonance crystal, and the circuitry that drives it. basically, you need a different laser.

>>279240

>resonance crystal

You're surely kidding, I'm not falling for that star wars shit.

>>279280
sorry, i should have said "gain medium" (it's essentially a crystal, though). from wikipedia:

A laser consists of a gain medium, a mechanism to energize it, and something to provide optical feedback.[8] The gain medium is a material with properties that allow it to amplify light by way of stimulated emission. Light of a specific wavelength that passes through the gain medium is amplified (increases in power).

For the gain medium to amplify light, it needs to be supplied with energy in a process called pumping. The energy is typically supplied as an electric current or as light at a different wavelength. Pump light may be provided by a flash lamp or by another laser.

>>278812
No, irrelevant, and no. If you want a blue laser, buy one.