Laser scanning side lobe suppression device of phased array

A technology of laser scanning and sidelobe suppression, applied in radio wave measurement systems, instruments, etc., can solve difficult problems and achieve the effects of high processing precision, stable and reliable performance, and simple structural design principles

Inactive Publication Date: 2013-01-09
SHANGHAI NORMAL UNIVERSITY
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AI Technical Summary

Problems solved by technology

The use of non-periodic or irregular phased arrays to compress the far-field sidelobe effect puts forward higher requirements for the precision processing technology of optical phased array devices with micron-scale irregular array structures, which is difficult

Method used

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  • Laser scanning side lobe suppression device of phased array
  • Laser scanning side lobe suppression device of phased array
  • Laser scanning side lobe suppression device of phased array

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Embodiment Construction

[0020] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] see figure 1 A phased array laser scanning sidelobe suppression device shown includes a main oscillator laser 1 and a phase compensation plate 5, and a beam expander collimator 2 and an optical phase control Array scanner 3, optical phased array scanner 3 is also connected with controller 4; The pre-designed phase compensation plate performs phase compensation on the scanning beam, suppresses the far-field side lobe, improves the beam quality of the scanning laser, and realizes high-resolution phased array laser scanning.

[0022] The optical phased array scanner 3 is an electronically controlled phase modulation array, which can be electro-optic materials or liquid crystal materials such as lithium niobate (L iNbO3) crystals, lithium tantalate crystals (L i TaO3), lead lanthanum zirconate titanate (PLZT) ceramics, etc...

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Abstract

The invention discloses a laser scanning side lobe suppression device of a phased array. The suppression device comprises a master oscillation laser and a phase compensation plate, a beam expanding collimator and an optical phased array scanner are arranged between the master oscillation laser and the phase compensation plate in sequence, and the optical phased array scanner is also connected with a controller; the distance between the output end of the optical phased array scanner and the phase compensation plate can meet the self-imaging conditions of fractional Talbot effect; and the phase of the phase compensation plate corresponds to the phase of the Fresnel diffraction propagated from an optical field of a laser array to an optical field in the fractional Talbot distance. The laser scanning side lobesuppression device of the phased array disclosed by the invention is used for outputting non-mechanical scanning beams with high beam quality in a phased array laser radar transmission system, has the advantages of simple structure, stable and reliable performance, rapid high-resolution non-mechanical laser scanning and the like, is specially suitable for the fields such as laser scanning radars and laser communications, and has significant meaning for development of compact, light and high-quality laser scanning system.

Description

technical field [0001] The invention relates to laser scanning side lobe suppression technology, more specifically, relates to a phased array laser scanning side lobe suppression device. Background technique [0002] LiDAR is widely used in target detection, tracking, aiming and imaging recognition due to its high resolution in frequency domain, space domain and time domain. With the increasing and complex requirements for target detection, higher requirements are placed on the function and performance of lidar. Especially in terms of its beam pointing accuracy and beam pointing control ability, the traditional mechanical servo system has been difficult to meet the needs of high-performance lidar. Optical phased array scanning technology enables LiDAR to have high-performance beam control and excellent operational flexibility, and has become an international research hotspot in recent years. [0003] The optical phased array is directly derived from the microwave phased ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/491
Inventor 闫爱民石旺舟胡志娟朱瑞兴
Owner SHANGHAI NORMAL UNIVERSITY
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