Patent ID: 8472022
Filing Date: 2013-06-25
Classification: G01J,G01M,G01N,H01S

Abstract:
1. A system for spectroscopic detection of a loss in a resonator cavity, the system comprising: a tunable laser source for generating a laser beam; a frequency locking system for either locking the frequency of the laser beam to a resonance of the resonator cavity or locking the length of the cavity to the frequency of the laser beam; a first modulation element comprising an amplitude modulator for modulating the laser beam at a first modulation frequency to generate a modulated laser beam comprising a first modulation signal; an input coupler adapted for directing the modulated laser beam into the resonator cavity; a first directing element for directing a first portion of light reflected from the input coupler to a first photodetector to generate a first detected signal; and a first demodulator capable of demodulating the first modulation signal from the first detected signal to generate a first error signal which is a function of the loss in the resonator cavity.