Green diode laser

A green Diode laser, comprising:

• a tubular laser casing having a first opening end and a second opening end;
• a heat sink sealedly mounted at said first opening end of said laser casing;
• a semiconductor chip supported by said heat sink for emitting a pumping radiation;
• an optical resonant cavity supported within said laser casing, including a lasing medium supported by said laser casing to optically communicate with said semiconductor chip for a light amplification of fundamental frequency, and an intracavity frequency doubler supported by said laser casing to optically communicate with said lasing medium for frequency doubling of said fundamental frequency, wherein an input facet is formed at said lasing medium for said pumping radiation entering thereinto, an output facet is formed at said intracavity frequency doubler for said frequency-double beam exiting therefrom;
• an IR blocking filter inclinedly and sealedly mounted at said second opening end of said laser casing to optically communicate with said output facet of said intracavity frequency doubler;
• and
• a photodiode supported by said heat sink at a position that when said frequency-double beam exits said output facet, said IR blocking filter reflects a portion of said frequency-double beam towards said photodiode such that said photodiode is adapted for detecting said frequency-double beam from said IR blocking filter as a feedback for controlling a power output of said optical resonant cavity.