Laser with temperature controlled harmonic generating crystal.

摘要

A laser produces a light beam which is passed through a nonlinear crystal along a beam path. The noncritical phase matching axis of the nonlinear crystal is offset at a slight angle from the beam path. The angle of exit of the second harmonic light from the nonlinear crystal varies with the temperature of the crystal. A segmented photodetector detects this beam angle and generates a temperature error signal. A temperature control element receives a temperature error signal and causes the temperature of the crystal to be adjusted.