LD (Laser Diode) laser phase mixing device and method

Abstract

The invention relates to an LD (Laser Diode) laser phase mixing device and an LD laser phase mixing method, which are used for mixing phases of light which is emitted by an LD light source and is collimated by a first collimating lens. The LD laser phase mixing device comprises a fixed cylindrical seat, a micro-motor, a cross grating and a second collimating lens, wherein the micro-motor is installed on the fixed cylindrical seat; the cross grating is installed on the micro-motor and rotates at high speed under the drive of the micro-motor; the second collimating lens is installed on the fixed cylindrical seat and the cross grating is arranged on an object focal plane of the cross grating to enable light waves emitted by all points on the light emitting surface of the LD light source to be fully mixed on the image focal plane of the second collimating lens after diffraction of the cross grating and the conversion of the second collimating lens. The device provided by the invention has the advantages that the structure is simple, the cost is low, the device is convenient and reliable to use, the device is especially suitable for the field of high-precision laser ranging, any beam of light waves which are emitted towards a reflecting target contains light wave information of all points of the light emitting surface and the sighting error caused by phase unevenness can be basically eliminated through an average effect of a photoelectric receiver.

Description

technical field [0001] The invention relates to an LD (laser diode) laser phase mixing device and method, especially suitable for the occasion of using a semiconductor laser array (LDA) as a light source for high-precision laser pulse distance measurement. Background technique [0002] Aiming error refers to a ranging error caused by inconsistency in ranging results when measuring at different positions in the spot of the beam emitted by the rangefinder. A point of light does not emit light at the same time, there is a certain time delay between them. Especially in high-precision long-distance pulse laser ranging, since it is necessary to use a semiconductor laser array (LDA) integrating multiple LD emitting units to generate high peak power laser pulses, it is more likely to cause time between each LD emitting unit Delay. [0003] The existing optical fiber phase mixing technology utilizes the mode dispersion characteristic of the optical fiber or utilizes the mode coupli...

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Problems solved by technology

[0004] However, regardless of the mode dispersion characteristics of the optical fiber or the mode coupling characteristics for phase mixing, it can only slightly improve the phase inhomogeneity of the luminous tube. Poor, especially when LDA is used, the influence of phase inhomogeneity on ranging accuracy cannot be eliminated

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