Fabry-Perot cavity and outer-cavity semiconductor laser

Abstract

The invention discloses a Fabry-Perot cavity and an outer-cavity semiconductor laser, wherein the Fabry-Perot cavity comprises a cavity body, a coupling mirror, a first reflecting mirror and a second reflecting mirror, incident beams are irradiated into the inside of the cavity body through the coupling mirror and rightly irradiated on the first reflecting mirror, after the incident beams are reflected by the first reflecting mirror, the incident beams go back to the coupling mirror and reflecting and transmission happen at the position of the coupling mirror, the beams which are reflected by the coupling mirror are rightly irradiated on the second reflecting mirror, after the beams are reflected by the second reflecting mirror, the beams go back to the coupling mirror, the beams which are reflected by the coupling mirror are rightly reflected on the first reflecting mirror again, and resonance oscillation of the beams among the coupling mirror, the first reflecting mirror and the second reflecting mirror is achieved; transmission beams which are through coupling mirror are irradiated out in the direction which is collinear with and opposite to the direction of the incident beams. Due to the fact that an extra electron feedback system does not need to be controlled when feedback beams are provided by the Fabry-Perot cavity, cost can be reduced, and line width of laser beams is further narrowed in a pressed mode when system stability is guaranteed.

Description

technical field [0001] The invention relates to the laser field, in particular to a Fabry-Perot cavity and an external cavity semiconductor laser. Background technique [0002] External cavity semiconductor lasers are important laser light sources in scientific research and industry. However, the output spectral line of the usual external cavity semiconductor laser is very wide, generally reaching hundreds of kilohertz or even several megahertz, which is far from the application requirements of many occasions. In order to obtain laser output with a narrow linewidth, one of the existing technologies currently used is to use an optical feedback method to inject a laser beam with a wider linewidth into a separately controllable Fabry-Perot cavity, and use the Fabry-Perot The laser beam transmitted by the Li-Perot cavity is fed back into the semiconductor laser tube, so as to realize the narrowing of the laser line width. [0003] Specific details of the prior art on optical f...

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Problems solved by technology

[0004] However, this solution has the following obvious defects: In the locking mode, since the external resonant cavity is easily disturbed by external vibrations and noises, the resonant frequency of the external cavity will be unstable

The Fabry-Perot cavity is track-locked on the unstable external resonator, which is not conducive to maintaining the stability of the Fabry-Perot cavity and the entire system, which is not conducive to the realization of laser linewidth narrowing

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