Abstract
Nd:YAG rod lasers have been plagued with the inability to go to high average powers because of thermally induced birefringence. We have developed a scalable Nd:YAG master oscillator/power amplifier (MOPA) laser system which employs a novel phase conjugation scheme to correct both for the material and thermal distortions as well as the thermal birefringence in a double pass amplifier. This scheme reduces the double pass depolarization from 42% to less than 7% and is easy to align.
© 1994 Optical Society of America
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