Ultra-narrow linewidth laser based on spatial light

Abstract

The invention provides an ultra-narrow linewidth laser based on spatial light. The ultra-narrow linewidth laser comprises a laser generation gain device, a space coupling lens, a first lens with transmission and reflection characteristics, a convex lens and a spherical mirror which are sequentially arranged, wherein the first lens is vertically arranged relative to the horizontal direction, the convex surface of the convex lens and the concave surface of the spherical mirror are oppositely arranged, and a distributed scattering medium is arranged on the concave surface of the spherical mirror.According to the invention, the space laser generated by the laser generation gain device is transmitted to the gain medium on the spherical mirror; the gain medium is used for carrying out line width compression on the space laser to obtain scattering signals with a narrower linewidth; the scattering signals are fed back and transmitted back to the laser generation gain device along an originalpath; the laser generation gain device carries out gain amplification on the received scattering signals, the scattering signals after gain amplification are used as space laser to be transmitted to the distributed scattering medium again along the original path to carry out line width compression, and when balance is achieved, the optical signals reflected and output by the first lens are subjected to multiple times of line width cyclic deep compression.

Description

technical field [0001] The invention belongs to the technical field of narrow line width lasers, in particular to an ultra-narrow line width laser based on spatial light. Background technique [0002] Ultra-narrow linewidth lasers have the characteristics of high coherence, high integration and low phase noise, so they have very important application prospects in LiDAR, digital coherent transmission systems and other application fields. So far, most of the studies on the characteristics of laser linewidth have focused on the one-dimensional transmission process of waveguide light, and there are few detailed studies on spatial lightwidth compression. As far as the current wide compression method for spatial light is concerned, such as using multi-mirror reflection and coupling as waveguide light and then using the external cavity method, there are problems in various current methods, such as the system is huge, or the wavelength needs to be limited, and it is difficult to dir...

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Problems solved by technology

[0003] The invention provides an ultra-narrow linewidth laser based on spatial light to solve the problem of complex structure and large volume of the current deep compression device for spatial light laser linewidth

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