Vector Bessel beam generating device

A Bessel beam and generating device technology, applied in the field of optics, can solve the problems of limited types of Bessel beams and complicated operation, and achieve the effect of simple and feasible operation process

Active Publication Date: 2019-05-31
NANKAI UNIV
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  • Claims
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Problems solved by technology

This method is complex to operate and the types of Bessel beams generated are limited

Method used

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  • Vector Bessel beam generating device
  • Vector Bessel beam generating device
  • Vector Bessel beam generating device

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Embodiment

[0034] Such as figure 1 As mentioned above, the vector Bessel beam generation device includes: a spatial light modulator SLM1 , a first lens 2 , a spatial filter 3 , a first wave plate 301 , a second wave plate 302 , a second lens 4 and a grating 5 .

[0035] The spatial light modulator SLM1 is used to receive and adjust the phase of the linearly polarized light to form adjusted light.

[0036] The holographic grating is loaded on the SLM1, which is used to diffract and adjust the light to form diffracted light with opposite vortex phase and intensity of Bessel distribution; the transmittance of the holographic grating is Where x is the abscissa of diffracted light in space coordinates, y is the ordinate of diffracted light in space coordinates; f is the space carrier frequency of the holographic grating, d is the period of the holographic grating, is the handedness coordinate of the holographic grating, r is the radial coordinate of the holographic grating, is the initia...

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Abstract

The invention discloses a vector Bessel beam generating device comprising a spatial light modulator, a first lens, a spatial filter, a second lens and a grating. The holographic grating is loaded on the spatial light modulator to realize diffraction of modulated light after adjustment by the spatial light modulator, thereby forming diffracted light that have opposite vortex phases and intensitiesin Bessel distribution. The diffracted light passes through the first lens and then is filtered by the spatial filter to form left-handed circularly polarized light and right-handed circularly polarized light; and the left-handed circularly polarized light and the right-handed circularly polarized light pass through the second lens and the light is overlapped by the grating to form a vector Besselbeam. According to the disclosed device, vector Bessel beams with different orders can be formed only by adjusting the holographic grating to change the vortex phases of the diffracted light; and theoperation is simple and feasible.

Description

technical field [0001] The invention relates to the field of optics, in particular to a vector Bessel beam generating device. Background technique [0002] The traditional Bessel beam is generated by an axicon lens. If you need to obtain a high-order Bessel beam, that is, a Bessel beam with orbital angular momentum, you need a phase mutation unit for vertically incident circularly polarized electromagnetic waves. The cross-polarized transmission component of the cross-polarized transmission component introduces a phase mutation related to its distribution position, and by superimposing the phase distribution required to generate the vortex beam and the phase distribution required to generate the Bessel beam, the cross-polarized component in the transmission field presents Propagation properties of Bessel beams carrying orbital angular momentum. This method is complicated to operate, and the types of Bessel beams generated are limited. Contents of the invention [0003] T...

Claims

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Application Information

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IPC IPC(8): G02B27/28G02B27/42G02B27/46
Inventor 涂成厚王珂王强张洪爽李勇男王慧田
Owner NANKAI UNIV
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