Semiconductor laser

Abstract

The invention discloses a semiconductor laser, which comprises a semiconductor PN junction, and a surface active Bragg reflection grating, a ridge-shaped waveguide array, a multimode interference waveguide and a super-symmetric array waveguide which are arranged on the semiconductor PN junction and distributed along the same column, the surface active Bragg reflection grating is arranged at one end of the ridge-shaped waveguide array, one end of the multimode interference waveguide is adjacent to the other end of the ridge-shaped waveguide array, and the super-symmetric array waveguide is adjacent to the other end of the multimode interference waveguide. According to the semiconductor laser, the surface active Bragg grating is used for providing single-frequency laser with tunable wavelength, the ridge-shaped waveguide array is used for gain amplification, the multimode interference waveguide is used for coherent coupling, and finally, the super-symmetric array waveguide is used for secondary transverse mode selection and gain. And high-power, narrow-linewidth and wavelength-tunable high-beam-quality laser is realized.

Description

Technical field[0001]The invention relates to the field of lasers, in particular to a semiconductor laser.Background technique[0002]Semiconductor lasers are laser devices that use semiconductor materials as working materials. They have the advantages of small size, light weight, direct electro-optical conversion, high conversion efficiency, good beam quality, and narrow laser line width. They are used in optical phased array lidar, active detection and recognition, etc. The field has a wide range of application prospects.[0003]The existing tunable, high beam quality semiconductor lasers mainly include waveguide mode selection single-tube devices such as master-controlled oscillator power amplifiers, tapered lasers, plate-coupled waveguide lasers, distributed feedback lasers, and distributed Bragg reflection lasers.[0004]Although high beam quality semiconductor lasers have made great progress in improving output power, beam quality, and optimizing spectral linewidth, various types of...

AI Technical Summary

Problems solved by technology

For example, the power amplifier of the master oscillator and the tapered laser obtain high power output through the tapered semiconductor optical amplifier, but the light output aperture of the tapered amplifier is usually above 100 microns, resulting in extremely low coupling efficiency with the single-mode fiber or single-mode waveguide

Another example is that a slab-coupled waveguide laser combines a specially designed epitaxial structure with a ridge waveguide to obtain high-quality laser light. However, the gain volume of the ridge waveguide is limited, so it is difficult to achieve high power output at the watt level.

As another example, distributed feedback and distributed Bragg reflection lasers use a built-in grating structure to achieve mode selection, but the design of the aforementioned built-in grating structure is complex, the process is difficult, and the development cost is high.

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