Narrow-band fiber laser for mixed medium microcavity full-optical tuning

Abstract

The invention discloses a narrow-band fiber laser for mixed medium whisper gallery mode microcavity full-optical tuning. The fiber laser comprises a semiconductor laser pump source, a wavelength division multiplexer, a gain fiber, a fiber isolator, an optical coupler, a polarization controller and a tapering fiber coupling mixed medium microcavity, wherein the units are connected end to end in a fiber coupling manner to form a fiber resonant cavity in a closed manner. The tapering fiber coupling mixed medium microcavity is taken as a mode selection unit in the fiber resonant cavity, light is coupled into the microcavity through one end of a tapering fiber, total reflection transmission is carried out on each end face to form a whisper gallery resonance mode, and the light is returned to the fiber resonant cavity through the other end of the tapering fiber. The mixed medium microcavity is composed of two or more than two layers of media, namely one or more layers of medium films with high index of refraction, great thermo-optical coefficient and high light transmissivity are wrapped on the inner layer medium surface of the microcavity. The laser has the characteristics of large wavelength coverage full-optical tenability, compact strucutre, good monochromaticity and the like.

Description

technical field [0001] The invention relates to a narrow-band fiber laser system with mixed-medium microcavity all-optical tuning, and belongs to the technical field of fiber lasers. Background technique [0002] Due to its advantages of all-fiber, high coherence and tunability, high efficiency, and compact structure, wavelength-tunable narrow-linewidth fiber lasers have become high-quality light sources for long-distance optical fiber communication and optical fiber sensing systems. They are used in military, medical and industrial processing There are also broad application prospects in other fields. [0003] The key to realizing narrow-band laser output is to realize narrow-band mode selection in the all-fiber laser resonator through reasonable cavity structure design and filtering technology. At present, narrowband laser output can be obtained through centimeter-scale linear short cavities and ring cavities with built-in narrowband fiber filters (ie, fiber gratings, sat...

AI Technical Summary

Problems solved by technology

However, using a long cavity or introducing more mode selection and wavelength tuning devices in the cavity will increase the probability of laser frequency and intensity noise, reducing the compactness and stability of the laser system

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