Frequency locked laser system

Abstract

This invention provides a frequency-locked laser system, including a probe light source, a frequency-output probe laser, and a frequency-doubled coupling light source to output a coupling laser. The frequency-locking module includes an electro-optic phase modulator to phase-modulate the probe laser and generate a modulated laser; a saturated absorption spectrum device receives the modulated laser and generates a saturated absorption spectrum signal, which is detected by a first photodetector; an electromagnetic induction transparent spectrum generation device receives the modulated laser and the coupling laser and generates an electromagnetic induction transparent spectrum signal, which is detected by a second photodetector; a frequency-locking controller generates a first error signal by modulating and demodulating the saturated absorption spectrum signal, which controls a first frequency modulation controller to lock the frequency of the probe light source; after the probe light source is locked, the electromagnetic induction transparent spectrum signal is modulated and demodulated to generate a second error signal, which controls a second frequency modulation controller to lock the frequency of the coupling light source. This solves the problems of complex tuning, poor stability, and large size in dual-wavelength laser systems.

Images