Multichannel orbital angular momentum multiplexing nonlinear holographic device

An orbital angular momentum and nonlinear technology, applied in nonlinear optics, instruments, optics, etc., can solve the problems of fewer channels, poor imaging effect, low signal-to-noise ratio, etc., and achieve reduced dependence, high signal-to-noise ratio, good imaging effect

Active Publication Date: 2020-07-17
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current nonlinear holographic technology has a small number of channels at optical frequencies, a low signal-to-noise ratio, and poor imaging effects

Method used

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  • Multichannel orbital angular momentum multiplexing nonlinear holographic device
  • Multichannel orbital angular momentum multiplexing nonlinear holographic device
  • Multichannel orbital angular momentum multiplexing nonlinear holographic device

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Embodiment Construction

[0021] This embodiment provides a multi-channel orbital angular momentum multiplexing nonlinear holographic device, such as figure 1 As shown, it includes a near-infrared laser 1, a linear polarizer 2, a beam splitter I 3, a spatial light modulator I 4, a lens I 5, a hole 6, a mirror 7, a lens II 8, a beam splitter II 9, and a light baffle 10 , spatial light modulator II 11, lens III 12, half-wave plate 13, lens IV 14, polarizing beam splitter 15, KTP crystal 16, lens V17, dichroic mirror 18 and CCD camera 19; wherein, near-infrared laser 1 After the emitted beam passes through the linear polarizer 2, it is separated into beam I and beam II by the beam splitter I3, and the beam I is reflected by the spatial light modulator I4, and then passes through the beam splitter I3, the lens I5, and the hole 6 in sequence , reflector 7, lens II 8, merge with beam II at polarizing beam splitter 15; light baffle 10 is placed on one side of beam splitter II 9, the beam separated by beam spl...

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Abstract

The invention discloses a multichannel orbital angular momentum multiplexing nonlinear holographic device. A near-infrared laser is used as a light source. The light beam emitted by the near-infraredlaser is split into a light beam I and a light beam II through a beam splitter I after passing through a linear polarizer, and the light beam I is reflected by a spatial light modulator I and sequentially passes through the beam splitter I, a lens I, a hole, a reflector and a lens II and is converged with the light beam II at a polarization beam splitter; a light barrier is arranged on one side ofthe beam splitter II, and the light beam II separated by the beam splitter II is reflected by the spatial light modulator II and sequentially passes through the beam splitter II, a lens III, a half-wave plate and the lens IV and is converged with the light beam I at the polarization beam splitter; the converged light beams pass through a KTP crystal and a lens V in sequence, fundamental waves andsecond harmonics are separated out through a dichroscope and finally the fundamental waves and the second harmonics are recorded through a CCD camera. The number of channels on each optical frequencyis increased, the signal-to-noise ratio is high and the imaging effect is good.

Description

technical field [0001] The invention relates to the field of optical nonlinear holography, in particular to a multi-channel orbital angular momentum multiplexing nonlinear holographic device. Background technique [0002] Holography uses holograms to reconstruct the intensity and phase information of an object. Since its invention, it has been widely used in three-dimensional holographic display, data storage, optical encryption, holographic interferometry and microscopy. Because of the unprecedented demand in information storage, people have taken advantage of the different orthogonal physical dimensions of light (including wavelength, polarization, space, and time) to multiplex multiple parallel information channels in a single hologram. Such holograms are called optical multiplexing. With holograms (OMH). [0003] In order to shape the wavefront of light generated in nonlinear optical processes, holography has been extended from the field of linear optics to nonlinear o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03H1/22G02F1/35G02F1/355
CPCG02F1/353G02F1/3551G03H1/2294
Inventor 杨昊成方心远张勇
Owner NANJING UNIV
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