A high polarization microchip green laser with dual Nd:YVO4 crystal

A high polarization Nd:YVO4/KTP laser with dual crossed gain crystal is reported. Using two optical axis orthogonal Nd:YVO4 crystal as gain medium, eliminating the depolarization effect of single Nd:YVO4 crystal, the high polarization green laser is obtained. With 1.8 W diode laser pump power the output power of TEM00 green laser is 366 mW, the light–light conversion efficiency is up to 20.3%, and the polarization ratio is 110:1. This laser has the advantages of being simple and easily attainable at a low cost, and it is suitable for batch production.

Research highlights
► High polarization green laser is attained using two optical axis orthogonal Nd:YVO4 crystal.
► Optical bonding is adopted among the components, which makes laser simple and suitable for batch production.
► Power of laser with dual Nd:YVO4 crystals is more than the sum power of one Nd:YVO4 crystal.