A wavelength locker for monitoring the wavelength drift of a laser uses a pair of detectors for detecting a power component of the laser beam and a wavelength component of the laser beam, respectively. Various positionings of the power detector and/or variations to the collimating lens provide a compact...http://www.google.com/patents/US6838658?utm_source=gb-gplus-sharePatent US6838658 - Simple and compact laser wavelength locker
