Single frequency fiber laser with high frequency stability

Abstract

The invention provides a single frequency fiber laser with high frequency stability. The laser comprises high gain optical fibers, a narrow-band fiber optical Bragg grating, a broadband fiber optical Bragg grating, a single-mode semiconductor pump light source, a wavelength division multiplexer, an optical fiber isolator, an optical coupler, a frequency discrimination system, an electronic servo system, PZT piezoelectric ceramic and a heat sink which can control temperature automatically. According to the single frequency fiber laser with high frequency stability, a laser short linear cavity structure is adopted, output optical signals act on the frequency discrimination system, generated error signals are transmitted to the electronic servo system, the PZT piezoelectric ceramic is driven to stretch and retract so that closed loop feedback control is formed, and therefore the single frequency fiber laser with the high frequency stability is obtained. The single frequency fiber laser with the high frequency stability can be applied to the fields such as coherent light communication, Doppler windfinding radars, cold atom physical experiments, gravitational wave detection and quantum optics.

Description

technical field [0001] The invention relates to a single-frequency fiber laser, in particular to a high-frequency stable single-frequency fiber laser with output power up to tens of mW and frequency stability of tens of MHz. Background technique [0002] Single-frequency narrow-linewidth fiber laser, also known as single longitudinal mode fiber laser, is characterized in that the laser works in a single longitudinal mode operation state, and the output spectrum linewidth is very narrow, up to 10 -9 nm. The narrow linewidth ensures that the laser has good coherence, and the coherence length can reach hundreds of kilometers. Narrow linewidth single longitudinal mode fiber lasers have important applications in the fields of high-speed optical communication, long-distance optical sensing, coherent communication, and high-precision spectral analysis. [0003] In laser communication, in order to improve the receiving sensitivity, the coherent heterodyne receiving method is gener...

AI Technical Summary

Problems solved by technology

The former of these two methods lacks the optimization of the frequency stabilization operation, and it is difficult to explain which part of the resonator has an effect on the overall operation of the resonator; the frequency stabilization accuracy of the latter is not ideal, and the PZT piezoelectric ceramics are tiny step, will lead to significant changes in the length of the resonant cavity, and the modulation is more difficult

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