Abstract
Enhanced birefringence compensation together with dynamic thermal focus correction was demonstrated in a high-power, high-pulse-energy oscillator based on two flashlamp-pumped, 1x10cm Nd:YAG rods. Birefringence compensation was achieved by 90i polarization rotation with either a quartz rotator between the rods or with a Faraday Rotator between forward and backward resonator passes. An Imaging Variable Radius Mirror NIVRM composed of discrete optics was used as the resonator rear mirror. Imaging was required to re-image the rod principal plane onto itself so as to minimize the birefringence compensation's bifocal tensing sensitivity. Dynamic control of the IVRM radius of curvature was required to compensate thermal focusing variations. Integration into a Reentrant configuration, enabled average output power of 114W @ 20Hz with 3% overall efficiency in a polarized beam. Pulse energy dropped by only 3% compared to cold operation.
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