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Lasers and LiDAR

A laser radar and laser technology, applied in the field of laser detection, can solve problems such as difficult to achieve high integration and high peak power, and difficult to meet the application requirements of laser radar

Active Publication Date: 2021-05-28
HESAI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing tunable solid-state lasers are difficult to meet the application requirements of lidar, and it is difficult to achieve both high integration and high peak power

Method used

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  • Lasers and LiDAR
  • Lasers and LiDAR
  • Lasers and LiDAR

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Experimental program
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Effect test

Embodiment Construction

[0043] It can be seen from the background art that the tunable laser in the prior art has the problem that it is difficult to meet the requirements of the lidar.

[0044] Specifically, for example, in automatic driving and unmanned driving, first of all, it is hoped that the detection distance of the lidar is far enough (for example, in the case of a reflectivity of 10%, the detection distance reaches 300m), then the laser needs to have high peak power and large pulse Second, if you want to obtain a denser point cloud to accurately identify pedestrians, vehicles, etc., you need a laser with a high repetition rate; after that, you want to reduce the design difficulty of the scanning mirror (the design difficulty of a one-dimensional scanning mirror is much lower than that of a two-dimensional scanning mirror. ), if a one-dimensional scanning mirror is used instead of a two-dimensional scanning mirror, the laser needs to be able to be tuned quickly, and combined with a splitting ...

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Abstract

A laser and a laser radar, the laser comprises: a pump unit, a gain unit, a Q-switching unit and a light splitting unit arranged in sequence along an optical axis; the pump unit generates pump light; the gain unit includes a gain medium; the The Q-switching unit includes a saturable absorber; the light splitting unit generates outgoing laser light and a plurality of tuned lights of different wavelengths; a resonant reflection surface and a scanning unit, the resonant reflection surface is located between the gain unit and the pump unit , the scanning unit is located on the optical path of the plurality of tuned lights, and the scanning unit selects one from the plurality of tuned lights and returns the selected tuned light according to the original optical path. The laser is a tunable laser that can realize Q-switching, can obtain higher peak power and greater pulse energy, and can effectively shorten the cavity length and volume of the resonator cavity, which is conducive to the realization of high integration and high peak power. Consideration of value power.

Description

technical field [0001] The invention relates to the field of laser detection, in particular to a laser and a laser radar. Background technique [0002] Tunable laser refers to a laser that can continuously change the laser output wavelength within a certain range. Such lasers are versatile and can be used in spectroscopy, photochemistry, medicine, biology, integrated optics, optical communications, and more. Current tunable solid-state lasers mainly use split structures and birefringent filters or etalons as intracavity tuning elements to achieve wavelength tuning. For example, US5317447 uses birefringent plates combined with active Q-switching to realize tunable pulsed lasers. For example, US5623510 uses etalon as a tuning element. [0003] Lidar is a commonly used ranging sensor, which has the characteristics of long detection distance, high resolution, and low environmental interference. It is widely used in intelligent robots, drones, unmanned driving and other fields....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/098H01S3/106G01S17/02G01S7/481G01S7/484
CPCH01S3/106G01S7/484G01S7/481G01S17/02
Inventor 李大汕向少卿
Owner HESAI TECH CO LTD
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