METHOD FOR TWO-DIMENSIONAL DEVIATION OF OPTICAL RADIATION Russian patent published in 2024 - IPC G02F1/133 

FIELD: acousto-optics; laser equipment.

SUBSTANCE: invention relates to acousto-optics and laser equipment, namely to the technique of interaction of pulsed laser radiation with a substance, in particular, to methods of controlling acousto-optical devices intended for controlling the direction of propagation and amplitude of optical beams with the possibility of separating wavelengths, their power, and can be used for deflecting optical radiation in various devices using lasers, for example, in laser locators, range finders, in laser surgical instruments, in devices for laser engraving, marking, processing and cutting materials, etc. In the method of two-dimensional deviation of optical radiation, radiation is generated by an additional high-frequency laser made on copper vapours with the possibility of generating simultaneously at two wavelengths, four paired acousto-optic deflectors are used, two for each laser radiation channel with the corresponding wavelength of the high-frequency laser, performing adjustment of high-frequency laser and additionally introduced laser radiation energy meter by means of additionally introduced control unit, for which material processing program is set by means of formation of matrix of parameters in form of table filled with data from energy meter, by means of the control unit, the starting laser radiation is generated in the form of a high-frequency laser sync pulse and the laser radiation energy meter is switched to the standby mode, performing by means of control unit adjustment of additionally introduced high-frequency generator for beginning of acoustic waves generation, each channel of laser radiation with one radiation wavelength is directed along coordinates X, Y, performing by means of control unit formation of acoustic waves by additionally introduced high-frequency generator when high-frequency signals are supplied to piezoelectric transducer, laser radiation is divided at the corresponding wavelength by means of an additionally introduced polarization plate into horizontally polarized and vertically polarized with the possibility of vertically polarized radiation falling depending on the wavelength on the first or second acousto-optical deflectors, and horizontally polarized radiation on rotated by 90° relative to the other, depending on the wavelength, first or second acousto-optic deflector, measuring intensity of radiation introduced into corresponding acousto-optic deflector in preset position deflected by means of diffraction grating of corresponding acousto-optic deflector, laser radiation is directed after corresponding acousto-optic deflectors with vertical polarization and horizontal polarization to an additionally introduced second polarization plate with possibility of addition after the second polarization plate of laser radiation of horizontal and vertical polarization so that each controlled position from each two-dimensional deflector coincides in direction, the path difference for two laser radiation channels with different wavelengths is taken into account and ultimately produces one laser radiation with total radiation from each acousto-optical two-dimensional deflector, after the second polarization plate part of the laser radiation is directed to the laser radiation energy meter, with the other part of the laser radiation the surface of the metal article is processed, data are transmitted from the laser radiation energy meter to the control unit, after which the following laser radiation pulses are supplied to the first and second acousto-optical deflectors for processing the material surface coated with the liquid layer, pulse-by-pulse energy in the pulse of the generated laser radiation is measured for each angular position after passing through the system of two-dimensional acousto-optical deflectors and the difference between the maximum and minimum values of not more than 5% of the amplitude of the maximum high-frequency signal is monitored.

EFFECT: high efficiency and uniformity of processing the surface of the material by enabling programmed scanning of the processed surface of the material of individual laser pulses, controlling the level of energy in each pulse and high efficiency of diffraction of the acousto-optic deflector.

12 cl, 5 dwg