Multi-pass light spot laser emitter

Abstract

The invention relates to a multi-pass light spot laser emitter. The emitter comprises a laser source and a lens, and is characterized in that the lens comprises a plurality of lens subareas, the mainoptical axes of a plurality of lens subareas coincide and have different focal lengths, and the laser source is arranged on the main optical axis, under irradiation of the laser source, when light passes through different lens zones, divergence angles of the light are different. Through optical shaping system partition or multi-configuration optical system synthesis of the laser transmitting end,multi-configuration output of the laser transmitting system is achieved, the beneficial effect that the sizes of laser multi-pass light spots of a single transmitting unit are similar is achieved, that is, the sizes of the light spots with different detection distances are similar, and therefore model selection and layout of detection devices are greatly simplified.

Description

technical field [0001] The invention relates to the manufacture and application of lasers, in particular to a laser emitter with multi-pass light spots. Background technique [0002] In optical transmitting and receiving systems such as laser communication, laser energy transmission, and laser analog countermeasures, in order to make full use of the directivity and low divergence of lasers, a longer effective working distance is often required. Therefore, the laser emitting end will be adjusted to the state of the small divergence angle of the laser. However, the light spot still gradually becomes larger with the increase of the transmission distance, that is, the size of the light spot at a short distance and a long distance will be very different. This state has caused great troubles to the laser receiving end. First, the energy density at the near end and the far end are very different, making it difficult to select detector devices. Second, the large difference in spot ...

AI Technical Summary

Problems solved by technology

This state has caused great troubles to the laser receiving end. First, the energy density at the near end and the far end are very different, making it difficult to select detector devices. Second, the large difference in spot size causes difficulties in positioning accuracy and detector layout.

First of all, when the distance between the laser emitter and the detector matrix is ​​relatively close, the divergence angle of the beam emitted by the laser emitter should be larger, so as to prevent the beam from irradiating between the detectors in the detector matrix, reducing the hit rate of the laser emitter; Secondly, when the distance between the laser emitter and the detector matrix is ​​relatively long, the divergence angle of the beam emitted by the laser emitter should be smaller, so as to prevent the light spot from becoming larger after the beam passes through a longer optical path, and more light may be irradiated in the light spot. detectors, making the measurement accuracy low

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