Apparatus for measuring parallelity of laser beam

Abstract

The invention relates to an apparatus for measuring parallel of laser beam, which adopts the tested light beam, diaphragm, a convergence lens, a semi-transmitting reflector, two column lenses, two four-quadrant detectors and a computer to form the measuring apparatus; it also adopts a convergence lens a semi-transmitting reflector, two column lenses, two four-quadrant detectors to form light beam parallel detector; it does light beam parallel detecting based on image diffusion focusing error detecting. It adopts differential method to eliminate the detecting error from the incidence light off-axis. It can own any sensitivity and linear range by designing the optical system; especially be suit for detecting the light caliber with high quality, and the laser beam with small diffusing angle and rotational symmetry.

Description

technical field [0001] The invention belongs to laser technology and is a device for measuring the parallelism of laser beams. It is mainly used in the detection of the divergence angle of the collimated laser beam and the measurement of the divergence angle of the small divergence angle and rotationally symmetrical laser beam. Background technique [0002] Laser collimator for measuring the coaxiality of large mechanical holes and shafting and the straightness, flatness and parallelism of the plane, laser range finder, laser atmospheric monitoring and wireless optical communication, all need collimated laser beams , the parallelism of the laser beam has a great influence on the performance of the measuring instrument and the communication quality. Therefore, the application range of the detection of the parallelism of the collimated laser beam is relatively large. The parallelism of the collimated laser beam is measured by the far-field divergence angle of the beam. [0...

AI Technical Summary

Problems solved by technology

[0004] 1) The interferometer is expensive;

[0005] 2) Generally, the interferometer has a large volume and is inconvenient to use;

[0006] 3) Vibration has a great influence on the measurement;

[0007] 4) The angle range that can be measured is small

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