| 摘要 |
PURPOSE:To attain a miniaturized solid-state laser device which does not require dust prevention by arranging a semiconductor laser element, a solid-state laser element, a non-liniar optical medium and a coupling optical system in the same package and providing a laser beam projecting window in the package as a part of a laser resonator. CONSTITUTION:Laser light 1a projected from a semiconductor laser 1 is collected and projected on a flat plate mirror 4a at the edge of a solid-state laser element by a coupling optical system 2. Then, the solid-state laser element 4 is excited by the laser beam, laser oscillation by the solid-state laser element 4 is generated by a laser resonator constituted by a flat mirror 4a and a plano- concave mirror 8 and laser beam fundamental waves from the solid-state laser element 4 are generated. The laser beam fundanmental waves are made incident on a non-linear optical medium 5 arranged in the resonator and the second harmonic are also projected as the transmitted light. Since an optical multi-layer film which reflects almost all the laser beam fundamental waves and that permeates almost all the second harmonic is formed on the plano-concave mirror 8 of the laser resonator, the second harmonic of the solid laser fundamental waves is taken out as light projected from a solid-state laser resonator. |
