520nm 5mw Green Laser Module Diode 515nm Laser Beam Dot Lazer Glass Lens Module

Magnificent piece of engineering.Excellent power stability, glass lens quality and collimation.Whoever designed and made this module deserves a lot of credit. I just bought a 2nd one!POWER: both modules I are stably at 6-7 mW at 4V.Certainly delivers the power promised.

I energized the laser I received with a precision current limited laser/LED driver. At 3V, I measured less than 500 uW (0.5mW) with both of my Newport optical power meters. The laser gave a reasonable beam but it was less than 10% of the output power that was advertised. If you really need 5mW or even 1-2mW, look somewhere else.I am buying 2 more to make sure I didn't get a substandard device. I post an update when I can.

It's tough to say for sure, but comparing head to head with a second 520nm laser, this one sure looks like a traditional DPSS infrared+crystal module at 532nm.