Single-frequency narrow-band optical fiber laser based on high roundness three-dimensional rotational symmetric microcavity

Abstract

The invention discloses a single-frequency narrow-band optical fiber laser based on a high roundness three-dimensional rotational symmetric microcavity. The laser comprises a semiconductor laser pumping source, a wavelength division multiplexer, an optical isolator, a rare earth doped fiber, a polarization controller, an optical coupler and a high roundness microballoon cavity-conical fiber coupling unit. The semiconductor laser pumping source is connected with the optical isolator through the wavelength division multiplexer, and is connected with the rare earth doped fiber through the output end of the optical isolator. The output end of the rare earth doped fiber passes through the polarization controller, the high roundness microballoon cavity-conical fiber coupling unit and the optical coupler in order, and finally is connected with the input end of the wavelength division multiplexer through the output end of the optical coupler to form a closed cavity. According to the invention, high roundness microballoon cavity-conical fiber coupling unit is used to select the frequency; through ultra-narrow bandwidth echo wall mold resonance spectrum formed in the high roundness microballoon cavity, the output laser has the advantages of ultra-narrow bandwidth; and the laser has the advantages of great coherence, high stability, compact structure, low cost, small loss and the like.

Description

technical field [0001] The invention belongs to the technical field of fiber lasers, and relates to a single-frequency narrow-band fiber laser based on a high-roundness three-dimensional rotationally symmetrical microcavity. Background technique [0002] Single-frequency narrow-bandwidth fiber lasers have the characteristics of high coherence, tunable frequency, low noise, and compact structure. They have broad application prospects in many fields such as spectroscopy, optical fiber sensing, oil exploration, power systems, and military defense. [0003] To achieve single-frequency narrow-band laser output, the key technology is to design a reasonable cavity structure and adopt appropriate filtering technology to achieve narrow-band frequency selection in the resonant cavity. At present, single-frequency narrow-band laser output can be achieved through ultrashort cavities, linear cavities with built-in saturable absorbers, composite cavities, and narrow-band filter devices (s...

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Problems solved by technology

[0004] Aiming at the disadvantages of high production cost, poor stability, low compactness and large output bandwidth in the prior art, the present invention proposes a high-roundness three-dimensional rotationally symmetrical microcavity frequency-selected single-frequency narrow-bandwidth fiber laser

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