CONTINUOUS WAVE, FREQUENCY-DOUBLED SOLID STATE LASER SYSTEMS WITH STABILIZED OUTPUT

摘要

A solid-state laser system for producing a frequency-doubled CW laser output beam having a stabilized output. The laser system includes within a threemirror resonator cavity, a Nd: YAG laser rod operating at an output wavelength of 1.064 um in the TEM transverse mode, and a KTP frequency-doubling crystal. At one end of the laser cavity the beam is reflected from a folding mirror through the frequency-doubling crystal to another reflecting mirror which reflects both the fundamental wavelength of the output beam from the laser rod, and also the doubled frequency beam at a wavelength of 0.532 um back through the frequency-doubling crystal onto the folding reflector. The folding reflector is coated to reflect light at the longer wave length but transmits substantially all of the light incident upon it at the 0.532 um wavelength. Cladding of the laser rod with Spinel or quartz and/or laminar flow cooling of the laser rod are utilized to maintain the temperature distribution over the surface of the laser rod substantially constant so as to stabilize the output power level at the frequency-doubled wavelength.