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A Hermitian-Gaussian mode beam splitter

A beam splitter and mode technology, applied in the optical field, can solve the problems of no beam splitter and complex structure, and achieve the effect of good stability and high precision

Active Publication Date: 2021-01-29
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This beam splitter is not directly applicable to Hermitian-Gaussian beams, so the structure is more complicated
So far there is no Hermite-Gaussian beam splitter without conversion

Method used

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  • A Hermitian-Gaussian mode beam splitter
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  • A Hermitian-Gaussian mode beam splitter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Such as figure 1 As shown, the phase converter is placed horizontally in the optical path one of the Mach-Zehnder (MZ) interferometer. The optical paths caused by the two optical routing paths of the MZ interferometer are equal, and different exits will cause different phase differences due to the different reflection times of the two outgoing beams. At the first exit, the phase difference of the two beams of light is 0, so interference constructive occurs; at the second exit, the phase difference of the two beams of light is π, so interference destructive occurs. When the Hermitian-Gaussian modes with different mode parameters m pass through the phase converter, the phase (m+1 / 2)θ will be introduced, so that a phase difference related to the mode parameter m will be introduced between the two optical paths of the interferometer. When θ=π, properly adjusting the lengths of the two optical paths can make the Hermitian-Gaussian mode whose mode parameter m is an even numb...

Embodiment 2

[0038] Such as figure 2As shown, the phase converter is placed in the optical path 1 of the Sagnac interferometer in a horizontal arrangement, the principle is the same as that of the M-Z interferometer, and the effect of beam splitting the Hermite-Gaussian modes with different m values ​​can be achieved. Similarly, if the phase converter is placed in the Sagnac interferometer in a vertical manner, the beam splitting of the Hermitian-Gaussian mode will be realized according to the value of n.

Embodiment 3

[0040] Such as image 3 As shown, the present embodiment utilizes orthogonal polarization states to realize interference, and replaces the two optical paths of the interference device with two orthogonal polarization states (usually horizontal and vertical polarizations), and then Figure 4 and Figure 5 The phase converter shown is loaded on the spatial light modulator in the form of a Fresnel phase plate, corresponding to Figure 6 and Figure 7 . Set the incident light to 45 ° Polarization, using the characteristic that the reflective phase spatial light modulator only modulates a single polarization (for example, the Holoeye Pluto-VIS-016 only modulates the horizontal polarization), so that the horizontal polarization component in the incident light passes through the phase converter, while the vertical polarization The straight polarized component is then equivalent to not passing through, thus introducing a phase difference between the two polarized components that i...

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Abstract

The invention relates to a Hermite-Gaussian mode beam splitter. The Hermite-Gaussian mode beam splitter comprises a phase converter and an interference device; the phase converter is added to the interference device; the interference device splits a light beam into a light beam A and a light beam B; the light beam A passes through the phase converter, and the light beam B does not pass through thephase converter; and the two light beams are combined again at the exits of the interference device. Phase values introduced by the phase converter and the arrangement mode of the phase converter arechanged, so that different phase differences are correspondingly generated at the two exits, and are related to a Hermite-Gaussian mode horizontal parameter m or vertical parameter n; a finally-inputted mode emerges at different exits, and therefore, Hermite-Gaussian mode beam splitting is realized. The Hermite-Gaussian mode beam splitter of the invention is based on two feature parameters, namely, the Hermite-Gaussian mode horizontal parameter and vertical parameter, any mode conversion does not occur, and the beam is split under a mode undamaged condition; a whole process does not involve diffraction, and the light directly transmits through the device, or is reflected, and therefore, the Hermite-Gaussian mode beam splitter can be considered as a general transmissive or reflective opticdevice.

Description

technical field [0001] The invention belongs to the field of optical technology, and relates to a high-order laser transverse mode beam splitter, in particular to a Hermitian-Gaussian mode beam splitter. Background technique [0002] The Hermitian-Gaussian mode and the Laguerre-Gauerian mode are two commonly used laser transverse modes. Beam splitters are devices used to separate laser modes into different spatial locations. At present, the Laguerre-Gaussian mode beam splitter technology is relatively mature, but the realization of the Hermite-Gaussian mode beam splitter is relatively difficult. The existing Hermite-Gaussian mode beam splitter scheme is to convert the mode into Laguerre-Gaussian light first, and then combine the existing Laguerre-Gaussian mode beam splitter to realize the beam splitting of the Hermite-Gaussian mode . This kind of beam splitter is not a device directly applicable to Hermitian-Gaussian beams, so the structure is relatively complicated. So ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/28
CPCG02B27/283
Inventor 张沛刘青贾俊亮张科鹏
Owner XI AN JIAOTONG UNIV
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