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Photon orbital angular momentum mode arbitrary multiplication and division method and system

An orbital angular momentum, photon technology, applied in optics, nonlinear optics, instruments, etc., can solve the problems of complex wavefront regulation and loss, and achieve the effect of OAM multiplication and division operations

Inactive Publication Date: 2020-11-17
SUN YAT SEN UNIV
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Problems solved by technology

However, the superposition of the above n phase modulations will correspond to the need for complex amplitude modulation, so the implementation of wavefront regulation is more complicated and because the amplitude modulation will introduce losses

Method used

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  • Photon orbital angular momentum mode arbitrary multiplication and division method and system
  • Photon orbital angular momentum mode arbitrary multiplication and division method and system
  • Photon orbital angular momentum mode arbitrary multiplication and division method and system

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specific Embodiment

[0055] Specifically, the input photon orbital angular momentum mode corresponds to the wavefront of the vortex light field having a specific angular helical phase exp(ilθ 1 ), the present embodiment takes l=2 as the input photon orbital angular momentum mode to realize the OAM multiplication operation of n=3 / 2 for illustration, and the vortex light field incident to the optical coordinate transformation module passes through the first phase plate and the first phase successively Plate helical decomposition and phase modulation Q(r 1 ,θ 1 ) and P(r 2 ,θ 2 ) to realize the helical coordinate transformation. After the helical transformation of this module, the intensity distribution of the incident light field changes from the original (r 1 ,θ 1 The circular distribution on the ) plane is transformed into (r 2 ,θ 2 ) spiral distribution on the plane, and the phase distribution is from the angle to the spiral phase exp(ilθ 1 ) is transformed into the spiral phase exp(inlθ ...

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Abstract

The invention discloses a photon orbital angular momentum mode arbitrary multiplication and division method and system, and the method comprises the steps that: a vortex light field carrying photon orbital angular momentum is vertically incident to a first phase plate of a (r1, theta 1) plane; the vortex light field is propagated to a second phase plate of the (r2, theta2) plane after being subjected to spiral decomposition and phase modulation by the first phase plate; the vortex light field passes through the second phase plate to enable phase distribution to be converted from an angular spiral phase exp (il theta 1) into an angular scaled spiral phase exp (inl theta 2), and the vortex light field passes through an optical 4f low-pass filtering module to obtain ideal vortex light with annular light intensity distribution; and ideal vortex light is output through output planes (r3 and theta 3) of the optical 4f low-pass filtering module. The system comprises an optical coordinate transformation module and an optical 4f low-pass filtering module. The photon orbital angular momentum mode arbitrary multiplication and division method and system can be widely applied to the field of square regulation and control.

Description

technical field [0001] The invention relates to the field of light field control, in particular to a method and system for arbitrary multiplication and division of photon orbital angular momentum modes. Background technique [0002] The vortex light is a kind of spatially structured light field, the light intensity distribution is a circular ring, and the corresponding phase distribution is a spiral phase structure with a linear angular change (carrying a spiral phase factor exp(ilθ), where l is a specific order of topological charge number, θ is the azimuth angle). Vortex light carries photon orbital angular momentum (Orbital angular momentum, OAM), and OAM modes corresponding to different topological charges (orders) have orthogonal properties. In optical communication applications, vortex optical modes of different orders can be used as channels for different information transmission, which provides an important technical way to increase communication capacity by orders ...

Claims

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Application Information

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IPC IPC(8): G02F1/01
CPCG02F1/0102G02F1/0121
Inventor 陈钰杰闻远辉余思远
Owner SUN YAT SEN UNIV
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