Birefringence-compensated alignment-insensitive frequency double

Details Birefringence-compensated alignment-insensitive frequency double Birefringence-compensated alignment-insensitive frequency double

1993-11-12

1995-11-14

Hellner, Mark

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359326, 359338, H01S 310, G01J 120

Patent

active

054672147

ABSTRACT:
Apparatus and a related method for generating a second harmonic frequency optical output from a fundamental frequency input beam, without significant birefringence. The apparatus includes two Type II doubler crystals of equal length arranged with their corresponding axes parallel to each other, and a polarization rotator positioned between the doubler crystals, to rotate the polarization angle of a residual fundamental frequency component of an output beam from one of the crystals by 90.degree. or an odd multiple of 90.degree.. Random birefringence introduced into one of the doubler crystals is virtually canceled in the other, and the assembly of the two crystals and the polarization rotator may be angularly adjusted as needed for phase matching or tuning, without detracting from the birefringence compensation capability. The invention is also disclosed in the context of a phase conjugated master oscillator power amplifier (PC MOPA) system.

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