Semiconductor laser for selecting mold by using total internal reflection polygonal resonant cavity

Abstract

The invention discloses a semiconductor laser for selecting a mold by using a total internal reflection polygonal resonant cavity. The semiconductor laser comprises a polygonal resonant cavity, an active FP (Fabry-Perot) resonant cavity and a coupler, wherein the polygonal resonant cavity is coupled with the FP resonant cavity through the coupler. In the polygonal resonant cavity, steering of light waves at the top point of the polygonal resonant cavity through a total internal reflection principle is realized, so that a resonant loop is obtained; a shallow etching process is adopted for each edge of the polygonal resonant cavity and the FP resonant cavity, so that loss is reduced; and the polygonal resonant cavity serves as a filter and is coupled with FP resonant cavity for selecting the mode, so that single-mode work of the laser is realized. In the semiconductor laser, an optical grating is not required to be manufactured, and the structure is simple; and the design of the total internal reflection polygonal resonant cavity can be used for realizing a semiconductor laser of jumpless mode turning or digital tuning.

Description

technical field [0001] The invention relates to a semiconductor laser, in particular to a semiconductor laser which utilizes total internal reflection polygonal cavity mode selection. Background technique [0002] Tunable semiconductor lasers have the advantages of compact structure, high integration, long life, and easy mass production, and have great application value in the fields of interferometry and optical communication. Among them, the tunable laser light source without mode hopping is especially important for interferometry. The jump of the light source mode in the measurement will have a great impact on the measurement accuracy of the detected quantity. For example, when measuring the distance, the mode hopping of the laser light source will be reduced. The spatial resolution of the measurement. For mode-hop-free tuning, when the lasing wavelength is tuned by a certain wavelength selection factor, the optical path length of the main resonator must be adjusted sync...

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