Integrated phased array laser radar system

Abstract

The invention discloses an integrated phased array laser radar system comprising a laser phased array transmitting module, a coupled grating array receiving module, and a coherent detection module. The laser phased array transmitting module includes a coherent laser light source and a laser emission phased array. The coupled grating array receiving module includes an imaging optical system and a coupled grating array; the imaging optical system converges echo laser reflected from different object space target points to a corresponding position point on a focal plane in image space; and the incident surface of the coupled grating array is located on the focal plane in image space of the imaging optical system. The coherent detection module includes a branch waveguide, a bus waveguide, localoscillator light, and a waveguide photoelectric detector. According to the invention, the integrated phased array laser radar system has advantages of fast scanning speed, small size, high system integration, low cost, long detection distance, and strong noise suppression ability.

Description

technical field [0001] The invention belongs to the technical field of phased array laser radar systems, in particular to an integrated phased array laser radar system. Background technique [0002] In the existing silicon-based waveguide phased-array lidar, a narrow-linewidth laser is used as the light source, and the output laser beam is guided into the silicon-based waveguide by an optical coupler. The laser light wave is transmitted in the silicon-based waveguide and finally reaches each An array element composed of a silicon-based phase shift unit and a silicon-based antenna, each phase shift unit is composed of a thermal electrode and a silicon-based waveguide, which is controlled by the system program control chip, by changing the electrical signal loaded on the phase shift unit , and then change the temperature of the hot electrode in the phase shift unit; due to the thermo-optic effect of the silicon material, the refractive index of the silicon-based waveguide in t...

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Problems solved by technology

[0004] Aiming at the defects existing in the prior art, the present invention provides an integrated phased array laser radar system, which aims to solve the problem of the low output power of a single semiconductor laser, the extremely small receiving optical antenna area of ​​the silicon-based antenna array, and the integrated Problems with phased array lidar systems not working at long distances

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