Waveplate for Correcting Thermally Induced Stress Birefringence in Solid State Lasers.
Patent, Filed 13 Mar 81, patented 4 Oct 83,
DEPARTMENT OF THE NAVY WASHINGTON DC
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This patent discusses thermally induced stress birefringence in laser resonators is eliminated by inserting a waveplate in the resonating cavity. The waveplate is chosen by matching its polarization transmission matrices of the laser rod and a Porro prism used as an end reflector in the resonating cavity. This produces a total polarization transmission matrix in the resonating cavity which is independent of ray coordinates. Additional control of the polarization transmission matrix is provided using a Porro prism as a cavity reflector that has an antireflection coating on its roof to change the required phase advance angle of the waveplate.
- Lasers and Masers