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Device for carrying out laser radar spectrum filtering by utilizing reflection type volume Bragg grating

A volume Bragg grating and spectral filtering technology, which is applied in the field of laser radar spectral filtering, can solve the problems of poor spectral filtering effect and affecting the accuracy of laser radar detection signals, etc., achieve good wavelength selectivity, high laser damage threshold, and improve signal-to-noise than the effect

Active Publication Date: 2021-03-16
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

The minimum peak transmittance at the center wavelength of commonly used filters is generally 40%-70%, the bandwidth of the filter is usually 5-10nm, and the center wavelength of the filter is fixed, the spectral filtering effect is not good, which seriously affects the laser Accuracy of Radar Detection Signals

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  • Device for carrying out laser radar spectrum filtering by utilizing reflection type volume Bragg grating
  • Device for carrying out laser radar spectrum filtering by utilizing reflection type volume Bragg grating

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Embodiment Construction

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of them. Based on the examples in this application. All other embodiments obtained by persons of ordinary skill in the art without creative efforts belong to the protection scope of the present application.

[0025] Such as figure 1 As shown, the present invention utilizes reflective volume Bragg grating to carry out lidar spectral filtering device, comprises narrow pulse laser ①, optical transmitting system ②, optical receiving system ③, first lens ④, optical pinhole ⑤, second lens ⑥ , reflective volume Bragg grating ⑦ and photodetector ⑧; narrow pulse laser ① emits laser pulses, input to the optical transmitting system ②, reflect from the target object, rec...

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Abstract

The invention discloses a device for carrying out laser radar spectrum filtering by utilizing a reflective volume Bragg grating. The device comprises a narrow pulse laser, an optical transmitting system, an optical receiving system, a lens, an optical small hole, the reflective volume Bragg grating and a photoelectric detector, when an output light beam passes through the reflective volume Bragg grating, a Bragg diffraction effect occurs when Bragg diffraction conditions are met, light beams which do not meet the conditions are transmitted through the volume Bragg grating, the bandwidth of thediffracted light beams is further narrowed, the intensity loss is very small, the bandwidth of a laser radar echo signal can be effectively reduced, the signal to noise ratio is improved, and the signal to noise ratio is reduced. Particularly, when the laser radar is applied to a strong background light environment, the spectrum filtering effect of the laser radar is improved.

Description

technical field [0001] The invention relates to the technical field of laser radar spectral filtering, in particular to a reflective device for performing laser radar spectral filtering by using a reflective volume Bragg grating. Background technique [0002] As an active detection technology that can accurately and quickly obtain three-dimensional space information of the target, lidar is widely used in ranging, tracking, imaging guidance, atmospheric monitoring, active remote sensing and other directions. In order to better obtain the echo signal of the lidar, generally better laser monochromaticity, that is, a narrower spectral linewidth is required. Improving the spectral filtering effect of lidar and obtaining narrower signal bandwidth has gradually become the focus of research. In the existing laser radar receiving system, the receiving method generally adopts the laser direct receiving method, and the spectral filtering widely adopts narrow-band filter for filtering....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/02G01S7/481G01S7/484G01S7/486G01S7/4861G02B5/18
CPCG01S17/02G01S7/481G01S7/484G01S7/486G01S7/4861G02B5/1861Y02A90/10
Inventor 刘博蒋贇范伟
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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