A laser beam splitting device with controllable central zero-order light intensity and its design method
A design method and zero-order technology, applied in optical components, instruments, optics, etc., can solve the problem that the central zero-order light intensity is difficult to control
Active Publication Date: 2020-08-25
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is: to overcome the deficiency that the zero-order light intensity in the center of the existing Damman grating beam splitter is not easy to control
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[0025] figure 1 It is a schematic diagram of the basic structure of the laser beam splitter with controllable central zero-order light intensity of the present invention. Taking the design of a 1×5 beam splitter with a total included angle of 20° at a laser wavelength of 650 nm as an example to illustrate the design process in detail:
[0026] (1) Determine the grating period d=7.486um according to the incident laser wavelength λ and the angle θ between the grating diffraction order m and the zero order.
[0027] (2) According to the required laser beam splitting number of 5, determine the number of phase discontinuity points within the grating period as K=4.
[0028] (3) The simulated annealing algorithm is used to optimize the coordinate x of the mutation point within a single period of the grating 1 ,x 2 ,x 3 ,x 4 and phase difference To achieve equal intensity laser beam splitting. The final optimized normalized mutation point coordinate value is: x 1 =0,x 2 =0.3...
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Abstract
The invention discloses a laser beam splitter with controllable central zero-order light intensity and a design method thereof and belongs to the field of optical element design. In order to solve theproblem that the central zero-order light intensity of existing Damman grating laser beam splitters is not easy to control, the new laser beam splitter is provided. The laser beam splitter is of a two-step pure-phase grating structure, the phase difference between every two adjacent phase abrupt change points is Pi, and the coordinate and phase difference of each phase abrupt change point in a grating cycle are optimized through an optimization algorithm to achieve laser beam splitting with equal light intensity. According to a designed diffraction device, when etching depth is slightly smaller than theoretical step depth, central zero-order light can be enhanced, and when the etching depth is slightly greater than the theoretical step depth, the central zero-order light can be weakened.Therefore, etching parameters can be conveniently adjusted to finally realize equal-intensity laser beam splitting, and the laser beam splitter has an important application value in the fields of laser radars, three-dimensional measurement, medical cosmetology and the like, wherein specific information is shown in the description.
Description
technical field [0001] The invention relates to the field of optical element design, in particular to a laser beam splitting device with controllable central zero-order light intensity and a design method thereof. . Background technique [0002] Converting a single laser beam into multiple laser beams with equal light intensity has a wide range of needs in many fields such as lidar, medical cosmetology, optical fiber communication, and optical information processing. In 1971, Daman proposed a spatial coordinate modulation binary phase grating, also known as Daman grating. Because this type of device is a Fourier transform beam splitter, it has the advantages that the light intensity uniformity of the spot array is not affected by the incident light intensity distribution and can produce arbitrary arrangement of lattices, so it is considered to be the most effective beam splitter at present. [0003] The Damman grating has a two-step structure, and the phase difference betw...
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IPC IPC(8): G02B27/00G02B27/10G02B5/18
Inventor 庞辉邓启凌曹阿秀史立芳吴育娟
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI