520nm wavelength lasers are belong to green laser pointers, also called viridian laser, which is a very rare laser. The first and most important aspect of 520nm green lasers is that they are direct-diode semiconductor lasers. This means the laser beam is emitted directly from the laser diode from the semiconductor. 532nm green laser pointer, on the other hand, are DPSS lasers that are more complex in construction. In fact, 532nm green lasers don’t even contain a green laser diode, instead, inside a 532nm green laser module is a 808nm infrared laser diode.