An automatic gain control circuit in the feedback path for a laser wavelength control circuit is described herein. This gain control circuit automatically adjusts the amplification of the analog signals output from a photodetector array, where the array detects a fringe pattern created by a laser beam....http://www.google.com/patents/US5867514?utm_source=gb-gplus-sharePatent US5867514 - Laser wavelength control circuit having automatic DC offset and gain adjustment
