Abstract: A method and apparatus is presented whereby control of the frequency of pulses emitted by a resonant ring slave laser is forced to a single frequency defined by a seed laser through the control of the pathlength of the ring laser resonant path. By monitoring the time difference between turn on of a Q-switch within the laser resonant cavity and the time of occurrence of the output pulse of the slave laser, and effecting changes to the ring laser resonant path in a manner to minimize the measured time difference, the frequency of the output pulse from the slave laser is driven to a single frequency defined by the seed laser resonator.

Abstract: A laser apparatus having an optical resonator composed of two end adjustably mounted mirrors positioned at each end of a YAG laser rod. In order to obtain mechanical stability and protection from the environment, concave mirrors having a radius of curvature of less than one meter are each installed in the mount. The mount includes a mirror cell which is preloaded into the mount housing using a generally truncated cone or belville washer shape as a spring. The center of the mirror is gimbaled about a bearing in the mirror cell. Once of the mirror is aligned, it is cemented in position. Thus, the mount combines a short radius of curvature mirror to reduce the sensitivity to optical and mechanical perturbations with a mount to provide mechanical stability in a high-shock environment.