ABSTRACT
To deal with the frequency locking between the lasers with optical passive cavity in Cavity-Enhanced Absorption Spectroscopy (CEAS), a novel scheme is proposed and analyzed based on optical amplification technique and self-injection frequency-locking technique. A simplified model is established for this scheme, and the relation between the intensity of resonance light and the absorption coefficient of the gas sealed in the cavity is obtained in steady-state status. By comparing the simulation results of 100 ppm concentration CH4 with the theoretical results, the feasibility of the proposed scheme is verified.
