The invention discloses a
green laser device which comprises a pumping source, a focusing lens, a self frequency multiplication
laser crystal and a frequency multiplication
crystal, wherein the pumping source, the focusing lens, the self frequency multiplication
laser crystal and the frequency multiplication crystal are sequentially arranged. The
laser transmitting faces of the self frequency multiplication laser crystal and the frequency multiplication crystal are plated with
dielectric film. The contact faces of the self frequency multiplication laser crystal and the frequency multiplication crystal are fixed together. By means of the
green laser device, the frequency multiplication crystal and the self frequency multiplication laser crystal are combined to jointly output green lasers. Under the low-temperature condition, the frequency multiplication crystal is mismatched, and the green lasers are output by the self frequency multiplication laser crystal; under the normal-temperature condition, the self frequency multiplication laser crystal serves as a laser crystal to generate
fundamental frequency lasers, due to the fact that the frequency multiplication crystal has the larger
nonlinear coefficient and the higher laser-laser conversion efficiency, frequency multiplication is carried out on the
fundamental frequency lasers through the frequency multiplication crystal to generate the green lasers for outputting, and compared with a single self frequency multiplication crystal, the laser-laser conversion efficiency and the output power are greatly improved. The gluing technology is adopted for the self frequency multiplication laser crystal and the frequency multiplication crystal, the structure is compact, and the stability is good.