Single-frequency fiber laser device with wide single-longitudinal-mode temperature range

Abstract

The invention discloses a single-frequency fiber laser device with a wide single-longitudinal-mode temperature range. The laser device is composed of a broadband fiber grating, a highly-doped gain fiber, a narrowband fiber grating, a wavelength division multiplexer, a single-mode semiconductor pump laser device and an optical isolator. The single-mode semiconductor pump laser device is used as a pump source to carry out pumping on a resonant cavity; with the fiber grating with the short grating zone length, the reflectivity of the narrowband fiber grating is optimized and improved; and with the ultra-short highly-doped gain fiber as a grain medium, the effective cavity length of the whole resonant cavity is shortened effectively from many aspects and the space between adjacent longitudinalmodes inside the cavity is increased substantially, so that the laser device is able to realize a stable single-frequency laser output within a wide temperature range. The laser device has the wide single-longitudinal-mode temperature range and is protected from being affected by the external environmental temperature in operation; and the stable single longitudinal mode output is realized. The laser device can be applied to fields of space detection, coherent optical communication, Doppler wind-finding radar, gravitational wave detection, and quantum optics and the like.

Description

technical field [0001] The invention relates to a laser light source, in particular to a single-frequency fiber laser with a single longitudinal mode whose temperature range can reach tens of degrees Celsius. Background technique [0002] Single-frequency fiber lasers have the advantages of narrow output linewidth, low noise, adjustable frequency, long coherence length, and compact structure. They have huge applications in high-precision fields such as coherent optical communications, optical atomic clocks, high-resolution laser spectrometers, and quantum communications. value. Among them, the single-frequency fiber laser with a short linear cavity structure is considered to be the most promising laser light source at present due to its compact and simple device and low cost. But relatively speaking, because the effective cavity length of the current single-frequency fiber laser with short straight cavity structure is still long, generally 3~10cm, the temperature range of t...

AI Technical Summary

Problems solved by technology

However, based on directly shortening the effective cavity length of the resonator, significantly increasing the distance between adjacent longitudinal modes in the cavity, and then obtaining a single-frequency fiber laser output in a wide single longitudinal mode temperature range, there are currently few relevant reports.

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