Green laser pointer is the most popular laser pointer in the world now, because green light is 6 times brighter than red light, the light column is more obvious than red light, and the price is much cheaper than blue light and yellow light. Users of laser pens generally choose green pens.

The wavelength of the light emitted by the green laser pen is 532nm, and the laser type is class IIIA, using two No.7 batteries. The brightness of the green laser pointer is relatively objective, so the danger to the eyes is also relatively high, and the higher the power, the more dangerous it is. Generally speaking, the 5mw laser pen is widely used, and the US market allows the 5mw laser pen. More than 5mw requires special approval. There are no strict restrictions in China, which requires our users to pay special attention to safety, not to point at the eyes or other easily injured parts to prevent the laser from entering the eyes through reflection. Generally speaking, the green light with adjustable focal length will also have a double protection switch.

The nonlinear crystal is excited by an infrared laser with a wavelength of 808nm, generating infrared light of 1064nm, and then frequency doubling to generate green light of 532nm, which belongs to a solid-state laser.

Some green lasers operate in pulsed or quasi-continuous mode to reduce cooling problems and extend battery life.

The published green laser without frequency doubling has higher efficiency.