Ultra-resolution compression amplitude optical modulator for laser remote transmission of central light spot
A technology of long-distance transmission and optical modulator, applied in the direction of instruments, optics, optical components, etc.
Inactive Publication Date: 2009-07-01
INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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There is currently no good way to achieve this compression of the far-field carrier beam
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[0018] The invention uses the photon sieve technology capable of compressing far-field light spots in beam shaping of long-distance laser communication. See figure 2 , a schematic diagram of a photonic sieve amplitude light modulator 3 based on a 50-ring Fresnel zone plate designed for the present invention. The photon sieve amplitude light modulator 3 is a plurality of circular holes regularly distributed on the flat plate of the Fresnel zone plate, wherein the amplitude transmittance of the circular holes is 1, except that the other parts of the circular holes are opaque, and the amplitude transmittance is 1. is 0. A plurality of circular holes satisfy a certain distribution: they are respectively distributed on odd (or even) rings at the positions of the Fresnel rings, and the size of the circular holes satisfies 1.5 times the width of each corresponding Fresnel ring.
[0019] The manufacture of the photonic sieve amplitude light modulator 3 is realized by using large-sc...
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Disclosed is an amplitude optical modulator for super-resolution compression of central spots of laser after distantly transmitting, which utilizes the photon sieve technology to realize compressing a central diffraction limit spot main lobe of the laser after distantly transmitting, the optical modulator is placed at the rear of a diffraction limit lens to perform geometric corrections on the distant-field central diffraction spot main lobe, and the correction degree is determined by device structures. The amplitude optical modulator utilizes a circular-hole distribution structure based on fresnel zone plates, and the position and the size of circular holes are given by the design calculation. The invention gives optimized photon sieve manufacturing parameters which can meet the requirement that the physical dimension compression ratio of the distant-field diffraction main lobe is about 0.4, and performs relative simulated experiments to validate that the amplitude optical modulator which utilizes the photon sieve technology to manufacture can realize compression of the distant-field main lobe of the laser beam after distantly transmitting. The invention can increase the quality of carrier beams for far-distance laser communication, can increase compact disk storage capacity, can increase confocal microscopic resolution, and can be used in various instruments needing changing distant-field diffraction spot main lobes.
Description
technical field [0001] The invention relates to the technical field of wavefront shaping of laser beams, in particular to an amplitude light modulator designed using photon sieve technology to realize geometric dimension compression of the central main lobe of far-field diffraction after long-distance transmission of laser beams. The modulator of the invention can be used to improve the quality of the microscope and increase the storage capacity of the optical disc. Background technique [0002] Compressing and shaping the far-field diffraction spot of laser is an important content of diffractive optics. Because in long-distance laser communication, the light spot at the receiving end will diverge very large as the distance increases, so it is a very useful technology to correct this divergent light spot. At the same time, for long-distance laser emitting devices, large-caliber emitting lenses are often required, but it is unrealistic to use only the method of increasing th...
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IPC IPC(8): G02B27/42
Inventor 贾佳姜骥谢长青刘明
Owner INST OF MICROELECTRONICS CHINESE ACAD OF SCI