EYESAFE LASER BEAM GENERATOR

PROBLEM TO BE SOLVED: To provide an eyesafe laser beam generator, which can achieve a more increase in the repetition frequency of an eyesafe laser beam and a more increase in the peak power of the eyesafe laser beam. SOLUTION: A generator has a pump laser resonator A which is composed of a pump laser medium 1A, a Q switching element 2A and front the rear mirrors 3A and 4A, and an optical parametric oscillator B which is composed of a crystal 1B for wavelength conversion, an intermediate mirror 2B and the rear mirror 4A. A laser beam L1 for excitation is inputted in the medium 1A and a fundamental wavelength laser beam L2 is generated from the medium 1A inputted with the laser beam L1 . When the laser beam L2 is transmitted through the element 2A, the laser beam L2 is converted into pulse-shaped light. When the value of the laser beam L2 exceeds a prescribed threshold value, the wavelength of the laser beam L2 is converted by the crystal 1B to generate an eyesafe laser beam L3 and this laser beam L3 is outputted to the outside. The laser beam L2 can be transmitted through the light transmission surface on one side of the light transmission surface of the medium 1A, and a radiating layer 14 which do not absorb the laser beam L2 is made to interpose between the mirror 3A and the medium 1A, in such a way as to intersect orthogonally the optical axis of the laser beam L1 .