Narrow linewidth laser used for coherent laser radar

Abstract

The invention relates to the technical field of coherent laser radar, and discloses a narrow linewidth laser used for a coherent laser radar, which comprises a substrate. A silicon refrigeration sheetis fixedly mounted on the left side of the top of the substrate; a circuit board is fixedly mounted at the top of the silicon refrigeration sheet; a laser gain chip is movably mounted at the top of the circuit board; a thermistor is fixedly installed at the top of the circuit board and located on the left side of the laser gain chip; a first cylindrical mirror is fixedly installed at the top of the substrate and located on the right side of the laser gain chip; and a second cylindrical mirror is fixedly installed at the top of the substrate and located on the right side of the first cylindrical mirror. According to the narrow linewidth laser used by the coherent laser radar, the laser gain chip is arranged, and an optical path of the outer cavity part does not need to bear high energy density, so that extremely high optical power output can be tolerated, coherent output of two paths of laser can be supported, and the narrow linewidth laser is suitable for application of various coherent optics.

Description

technical field [0001] The invention relates to the technical field of coherent lidar, in particular to a narrow linewidth laser used in coherent lidar. Background technique [0002] Lidar is a radar system that emits laser beams to detect the position and speed of the target. Its working principle is to transmit a detection signal to the target, and then compare the received signal reflected from the target with the transmitted signal for appropriate processing. After that, the relevant information of the target can be obtained, such as target distance, azimuth, height, speed, attitude and even shape parameters, so as to detect, track and identify targets such as aircraft and missiles. [0003] According to the Chinese authorized invention CN201510999578.7, the external cavity narrow linewidth laser has the beneficial effects of narrow linewidth, high power, low noise and high frequency stability, and can be applied to high-order modulation formats and coherent detection sy...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a narrow-linewidth laser used in coherent laser radar, which has the advantages of conveniently and quickly realizing narrow-linewidth laser oscillation and linear frequency modulation output and strong stability, and solves the problem of satisfying long-term For distance detection, the line width of the laser must be narrow enough to meet the coherence of time and distance. Secondly, the laser must have a wide range of linear frequency modulation capabilities, and the line width should remain consistent during the frequency modulation process.

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