Collimating and beam expanding device for semiconductor laser sources of laser radar

Abstract

The invention discloses a collimating and beam expanding device for semiconductor laser sources of a laser radar. The collimating and beam expanding device is mainly composed of an aspherical lens, a quartz positive lens, a tunable flange and the like. The collimating and beam expanding device is simple in structure, low in cost and good in beam collimation performance, a divergence angle of a semiconductor laser is compressed from 0.2X0.4rad to below 0.2mrad, and the requirement of the laser radar for probing light sources is met; the device is stable in optical and mechanical properties, can be used under level-18 random vibration at the environment temperature from minus 30 DEG C to minus 50 DEG C, and meets the requirement of the laser radar on stability in bad conditions; the device is provided with the flange, semiconductor laser sources different in divergence angle can be obtained by fine tuning of the flange of the beam expanding device; by tuning of the flange, the device can also be applied to beam collimation of other different-wavelength light sources.

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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