Device for adjusting laser beam divergence angle in real time

Abstract

The invention discloses a device for adjusting a laser beam divergence angle in real time. In the device, a beam expander secondary mirror, a fixed wedged mirror, a guide rail and a beam expander main mirror are sequentially fixed on a base, the vertical light transmission surface of the fixed wedged mirror is arranged opposite to the beam expander secondary mirror; the guide rail is parallel to the inclined light transmission surface of the fixed wedged mirror, a translation platform is arranged on the guide rail, an adjustable wedged mirror is arranged on the translation platform; the inclined light transmission surface of the adjustable wedged mirror is arranged opposite to the inclined light transmission surface of the fixed wedged mirror in parallel; the translation platform is used for carrying the adjustable wedged mirror to move along the guide rail, and laser varies with the changes of the lens thickness of the adjustable wedged mirror so as to change a light path between the beam expander main mirror and the beam expander secondary mirror and achieve the aim of changing the laser beam divergence angle. In the process of changing the laser beam divergence angle by the device for adjusting the laser beam divergence angle in real time, which is provided by the invention, a laser transmitter optical axis can be kept stable so that the emitted laser stably irradiates on a target favorably. The device for adjusting the laser beam divergence angle in real time, provided by the invention, has the advantages of simple structure and convenience in use and is suitable for application to a high-accuracy focusing system.

Description

technical field [0001] The invention belongs to the field of beam control of laser systems, and in particular relates to a real-time adjustment device for diverging angles of laser beams. Used in laser systems to change the divergence angle of the laser beam in real time. Background technique [0002] In the laser system to track and identify the dynamic target or the laser ranging system, when the laser irradiates the target, it is necessary to change the laser beam divergence angle in real time according to the distance of the dynamic target, so that the spot covers the target feature part and keeps the spot size at the target basically unchanged. , to ensure that enough target areas are illuminated to facilitate the extraction of target feature contours and the determination of tracking points. At present, the known real-time adjustment device for laser beam divergence uses a translation platform to carry a laser beam expander secondary mirror or primary mirror to move o...

AI Technical Summary

Problems solved by technology

In the process of moving the secondary mirror or the primary mirror to change the divergence angle of the laser beam, the movement of the lens that deviates from the original optical axis of the optical system will cause the laser emission axis to deviate from the original optical axis more sensitively, so that the laser spot irradiated on the target deviates from the required The position, affect the lighting effect

Especially in long-distance dynamic target illumination, small changes in the laser emission axis will cause the illumination spot to deviate from the target, making it difficult to achieve effective illumination

And because the change of the divergence angle of the laser beam is more sensitive to the change of the distance between the primary and secondary mirrors, the method of directly moving the primary and secondary mirrors to change the divergence angle of the laser beam has higher requirements on the translation stage, usually with a resolution of less than 1 micron

Images