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Non-destructive vortex light field beam splitting device

A vortex light, non-destructive technology, applied in the fields of laser technology, nonlinear photophysics, atomic physics, can solve the problems of original state destruction, low efficiency, etc., to achieve the effect of improving purity and good imaging effect

Pending Publication Date: 2020-07-28
青岛鲲腾量子应用技术有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A disadvantage of this method is that the original state is completely destroyed after the measurement, and it is not very efficient

Method used

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  • Non-destructive vortex light field beam splitting device
  • Non-destructive vortex light field beam splitting device
  • Non-destructive vortex light field beam splitting device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A

[0071] Embodiment A is specifically as follows: R 4 =0.95, T=0.98, the transmittance T of the annular cavity, and the transmittance T of the output coupling mirror 27 4 and the phase δ of the intracavity beam propagation of the annular cavity is fixed, by adjusting the reflectivity R of the input coupling mirror 21 1 , to obtain the reflection coefficient C of the ring cavity as shown in Figure 5(a) R and transmission coefficient C T with the reflectivity R of the input coupling mirror 21 1 relationship curve.

[0072] From Figure 5(a), the transmission coefficient C of the annular cavity R Reaching the minimum value, the reflection coefficient C of the annular cavity T Reaches the maximum value. R in Figure 5(a) 1 becomes larger, the impedance mismatch of the device increases, and the transmission coefficient C of the annular cavity T value decreases, the reflection coefficient of the annular cavity C R The value is increasing. The transmittance of the input couplin...

Embodiment b

[0073] Embodiment b is specifically as follows: R 1 =R 4 =0.90, T=1, as shown in Figure 5(b), this embodiment simulates when the ring cavity resonates with |1>, the input mode is ), the reflection coefficient C of the annular cavity with different phase transformation ΔΦ R and transmission coefficient C T pattern shape. In this example, the language of quantum mechanics is used to represent different OAM modes, defining When ΔΦ increases, the transmission spectra of the modes |1> and |-1> split from the degenerate state to the non-degenerate state, and when the transmission spectra of the two modes are completely separated, the transmission mode only contains the mode resonant with the ring cavity, The other mode is fully reflective.

Embodiment c

[0074] Embodiment c is specifically as follows: for the input mode is ), when the mode matching coefficient M (the mode matching coefficient is the overlapping ratio of the input mode and the cavity eigenmode) varies from 0 to 0.995, the spatial shape of the transmitted and reflected beams is shown in Figure 5(c). When M=0 When , both modes of light are completely reflected, and no mode of light is transmitted from the cavity; while for almost perfect mode matching M = 0.995, one mode of light is completely reflected, and the other mode of light is completely transmitted.

[0075] The experimental and simulation results of the present invention for other different input modes are shown in FIG. 6 . The input modes are the transmission spectra of |0>+|1>, |1>+|2>, |-1>+|1> and |-2>+|2>, such as Figure 6(a)-6(d) shown in . For high topologically charged OAM modes, more irrelevant high-cavity modes will appear in the transmission spectrum due to the impurities of the input mod...

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Abstract

A non-destructive vortex light field beam splitting device comprises an annular cavity mode selection module, and the annular cavity mode selection module comprises an input coupling mirror, a first Dove prism, a second Dove prism, a scanning cavity locking assembly, a concave mirror and an output coupling mirror which form an annular cavity; an input light beam is partially reflected and partially transmitted by the input coupling mirror; an LG light beam transmitted by the input coupling mirror sequentially passes through the first Dove prism, the second Dove prism, the scanning lock cavityassembly, the concave mirror, the output coupling mirror and the output coupling mirror to reflect and transmit part of light, and the reflected LG light beam is also partially reflected and partiallytransmitted after entering the input coupling mirror. And thus, the two OAM carrying light beams with opposite topological charges are changed from a degenerate state to a non-degenerate state.

Description

technical field [0001] The invention relates to the technical fields of laser technology, nonlinear optical physics and atomic physics, in particular to a non-destructive vortex optical field beam splitting device. Background technique [0002] The full degrees of freedom of light include frequency, intensity, polarization and orbital angular momentum (OAM). The singularity of the intensity and phase distributions of OAM-carrying beams has inspired many exciting applications, such as optical manipulation and trapping, high-precision optical metrology, and quantum information processing. The mutually orthogonal OAM modes offer the possibility of spatial mode multiplexing for high-capacity classical optical communication. The infinite dimension of OAM modules makes dense coding and coordinate-independent quantum key distribution more promising. For various applications based on multiple OAM modes, it is crucial to effectively identify and separate different OAM modes. In pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/10G02B27/09G02B27/28
CPCG02B27/0938G02B27/0972G02B27/0977G02B27/1026G02B27/104G02B27/285
Inventor 周志远李岩张万斌史保森郭光灿
Owner 青岛鲲腾量子应用技术有限公司
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