Semiconductor laser with adjustable coherence and application

Abstract

The invention discloses a coherence-adjustable semiconductor laser and application, and the semiconductor laser comprises a deformed resonant cavity which comprises a first concentric cavity, a connection cavity and a second concentric cavity; the few-mode electrode injection region is arranged on the upper surface of the deformed resonant cavity and is used for generating high-coherence laser; the multimode electrode injection region is arranged in a region outside the few-mode electrode injection region on the upper surface of the deformed resonant cavity and is used for generating low-coherence laser; the isolation layer is arranged on the side wall of the deformation resonant cavity; the first metal layer is arranged on the isolation layer; the second metal layer is arranged on the first metal layer; and a third metal layer disposed on the second metal layer. According to the semiconductor laser with adjustable coherence provided by the invention, the pattern electrode is introduced on the upper surface of the cavity and the partition injection is carried out, and the magnitude of the injected current in different electrode areas is different, so that the laser can realize adjustable coherence.

Description

technical field [0001] The invention relates to the field of semiconductor lasers, laser display technology and biological imaging technology, in particular to a semiconductor laser with adjustable coherence and its application. Background technique [0002] The excellent properties of laser such as high coherence, high directionality, high brightness and good monochromaticity make lasers widely used in various industrial fields such as laser ranging, laser display, optical communication, laser weapons, laser whitening, laser processing, etc. big application. Due to the high coherence of laser light, speckle phenomenon will occur in equipment using laser light as a light source. In laser display, laser holography, coherence tomography, and synthetic aperture radar imaging, the speckle generated by laser will seriously damage the imaging quality and interfere with the accurate reading of information in the image. It is necessary to reduce or eliminate laser speckle to improv...

AI Technical Summary

Problems solved by technology

At present, the mature method of suppressing speckle is to add optical devices to suppress speckle on the optical path of the laser, but this method is costly, depends heavily on the stability of the environment, and cannot meet the high coherence of the laser. and switching between low coherence

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