SPECTROSCOPIC DETECTION SYSTEM AND METHOD

摘要

A system and method for spectroscopic detection of a loss in a resonator cavity. The system comprises: 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 for modulating the laser beam at a first modulation frequency to generate a modulated laser beam; 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.