A heterodyne laser instantaneous frequency measurement system is disclosed. The system utilizes heterodyning of a pulsed laser beam with a continuous wave laser beam to form a beat signal. The beat signal is processed by a controller or computer which determines both the average frequency of the laser...http://www.google.de/patents/US4798467?utm_source=gb-gplus-sharePatent US4798467 - Heterodyne laser instantaneous frequency measurement system
