A laser radar semiconductor laser light source collimation and beam expansion device

Abstract

The invention discloses a laser radar semiconductor laser light source collimation and beam expansion device, which is mainly composed of an aspherical lens, a quartz negative lens, a quartz positive lens, an adjustable flange and the like. The device has simple structure, low cost, and good beam collimation performance. It can compress the divergence angle of the semiconductor laser from 0.2×0.4rad to less than 0.2mrad, which meets the requirements of laser radar for detecting light sources. The optical and mechanical properties of the device are stable, and can It is used in 18-level random vibration and ambient temperature of -30°C - -50°C, which meets the stability requirements of lidar under harsh conditions; the device is equipped with a flange, and different divergence angles can be obtained by fine-tuning the flange of the beam expander The semiconductor laser light source; by adjusting the flange, the device can also be applied to collimate the beams of other light sources with different wavelengths.

Description

technical field [0001] The invention relates to a collimating beam expanding device, in particular to a collimating beam expanding device applied to a semiconductor laser of a laser radar detection light source. Background technique [0002] Semiconductor lasers are a class of optoelectronic devices with a wide range of uses. They have the advantages of high photoelectric conversion efficiency, small size, long life, and high power density. They are widely used in material processing, laser marking, laser printing, laser ranging, laser storage, etc. In the civilian field, as well as military fields such as laser guidance and laser weapons, semiconductor laser technology covers almost all optoelectronic fields. [0003] In the field of laser radar, the application of semiconductor lasers as detection light sources further increases the small size and weight of laser radar, increases the detection wavelength and high precision of laser radar, and is widely used in remote sensi...

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Problems solved by technology

[0006] The problem to be solved by the present invention is to solve the problem that the divergence angle of the semiconductor laser radar is too large to be applied in the laser radar, and to provide a laser radar semiconductor laser light source collimation and beam expansion device, which can compress the emission angle of the high-power pulsed semiconductor laser To 0.2mrad, in order to ensure the needs of laser radar for detecting light sources; According to the traditional physical optics theory, the collimation characteristics of the beam expander are related to the beam expander performance, that is to say, the divergence angle of the beam is inversely related to the spot size. Obtaining a quasi-parallel beam with a very small divergence angle requires a large beam expansion factor of the beam expander, which can expand the spot of the beam to a large size. Therefore, under normal circumstances, the multiple of the beam expander is generally below 20 times.

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