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Orbital Angular Momentum Optical Comb Generation Method and System Based on Angular Binarized Phase
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An orbital angular momentum, binarization technology, applied in optics, nonlinear optics, instruments, etc., can solve the problems of complex system, long grating calculation time, low diffraction efficiency, etc., and achieve the effect of strong stability and simple structure
Active Publication Date: 2022-05-24
BEIJING INSTITUTE OF TECHNOLOGYGY
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However, existing OAM spectrum clipping techniques or OAM optical comb generation schemes often have problems such as long grating calculation time, complex systems, or low diffraction efficiency.
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Embodiment 1
[0033] Example 1: Generate OAM optical comb with OAM mode range: -63 to +63, OAM mode interval Δl=2
[0034] In this embodiment, according to the OAM state range and mode interval of the OAM optical comb, the phase distribution of the angular binarized phase grating obtained by computer numerical calculation includes 70 angular phase turning points, and is composed of:
[0036] The angular binarized phase grating is loaded on the liquid crystal spatial light modulator to obtain the far-field diffr...
Embodiment 2
[0037] Example 2: Generate OAM optical comb with OAM mode range: -62 to +62, OAM mode interval Δl=4
[0038] In this embodiment, according to the OAM state range of the OAM optical comb and its mode interval, the phase distribution of the angular binarized phase grating obtained by computer numerical calculation includes 68 angular phase turning points, and is composed of:
[0040] The angular binarized phase grating is loaded on the liquid crystal spatial light modulator to obtain the far-field dif...
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Abstract
The invention discloses a method and a system for generating an orbital angular momentum optical comb based on an angular binary phase. The present invention introduces a phase turning point for the pure phase grating along the angular coordinates, and a phase jump from 0 to π or π to 0 will appear at the turning point, thereby generating a 0-π angular binary phase grating. By setting the appropriate number of phase turning points and their angular position coordinates, the incident fundamental mode Gaussian beam can be modulated into a structured beam containing a series of orbital angular momentum modes with equal mode spacing and equal mode intensity, that is, an orbital angular momentum optical comb. The orbital angular momentum mode range and mode interval of the generated orbital angular momentum optical comb are only related to the number of angular phase turning points and the angular position coordinates. The orbital angular momentum optical comb generation system based on the angular binary phase of the present invention adopts the fundamental mode Gaussian beam to directly irradiate the angular binary phase grating of the present invention. Orbital angular momentum keying communication and other fields have broad application prospects.
Description
Technical field: [0001] The invention relates to the field of optoelectronic technology, in particular to a method and system for generating an orbital angular momentum optical comb based on an angular binarization phase. Background technique: [0002] Similar to macroscopic objects, microscopic particles such as photons also carry angular momentum. The angular momentum carried by photons includes two forms: spin angular momentum (SAM) and orbital angular momentum (OAM). Among them, SAM corresponds to the macroscopic left-right circular polarization state; OAM corresponds to the helical wavefront of the beam. Studies have shown that the complex amplitude contains a helical phase factor The beam of is a vortex beam, where l is the topological charge, also known as the OAM mode order, are the angular coordinates. Each photon of the vortex beam carries a value of OAM ( In order to reduce Planck's constant), the helical phase has a phase singularity in the center of th...
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