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Optical system for generating any-order optical vortex array and limited optical lattice with defects

An optical vortex and optical system technology, applied in the field of optics, can solve the problems of complex amplitude modulation, single modulation of light waves, etc., and achieve the effect of saving experimental equipment and space, strong applicability and flexibility, and simple optical path.

Active Publication Date: 2022-02-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The spatial light modulator is a device that can be used to modulate the amplitude and phase of the light field. Most of the existing spatial light modulators can only modulate the amplitude or phase of the light wave alone. To achieve simultaneous independent modulation of the amplitude and phase is Complex amplitude modulation presents certain difficulties

Method used

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  • Optical system for generating any-order optical vortex array and limited optical lattice with defects
  • Optical system for generating any-order optical vortex array and limited optical lattice with defects
  • Optical system for generating any-order optical vortex array and limited optical lattice with defects

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The laser 1 emits a linearly polarized beam with a wavelength of 632.8nm. After passing through the half-wave plate 2 and the polarization beam splitter 3, the polarization direction of the light is horizontally polarized. The outgoing light enters the beam expander 4 along the light propagating direction, and the beam expander 4 expands the beam. The diameter of the expanded spot is about 3 mm, which can match the liquid crystal panel of the spatial light modulator 5 .

[0044] The light beam expanded by the beam expander 4 is irradiated to the spatial light modulator 5, and the spatial light modulator 5 is controlled by a computer 10, and can load a hologram of an alternating optical vortex array of any order in real time. After complex amplitude modulation by the spatial light modulator 5 and focusing by the first lens 6, the first-order diffracted beam is selected by the diaphragm 7, that is, an arbitrary-order alternating optical vortex array of the target is obtain...

Embodiment 2

[0051] Using the same optical path diagram and complex amplitude encoding method as in Embodiment 1, changing the values ​​of parameters n, a and b, loading the obtained hologram on the spatial light modulator 5, and obtaining different parameters on the image detector 9. tunable finite light lattice.

[0052] Figure 4 It is the light intensity distribution experiment result diagram of the tunable finite light lattice produced under different parameters, and the light intensity value is taken as the common logarithm, where: Figure 4 (a)n=3, Figure 4 (b) n=4; parameter w 0 The value of 1.5mm. according to Figure 4 (a1), 4(a3), 4(a5), 4(b1), 4(b3) and 4(b5), it can be found that when the values ​​of parameters a and b are equal, a square finite light lattice is produced array. From Figure 4 In (a2), 4(a4), 4(b2) and 4(b4), it can be seen that when the values ​​of parameters a and b are not equal, a rhombic finite optical lattice array or a rhombic defected Finite Li...

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Abstract

The invention discloses an optical system for generating an any-order optical vortex array and a limited optical lattice with defects. The optical system comprises a laser, a collimation and beam expansion system, a spatial light modulator, a 4-f system and an image detector which are arranged according to an optical path. Linear polarization Gaussian light emitted by the laser passes through the collimation and beam expansion system and then irradiates the spatial light modulator for complex amplitude modulation, first-order diffraction light of the emergent light generates an arbitrary-order alternating optical vortex array on the rear focal plane of the first 2-f system, and an adjustable limited optical lattice with defects is generated on the rear focal plane of the second 2-f system. The topological charge value of each vortex in the generated random-order alternating optical vortex array and the distance between the vortexes can be accurately controlled; light spots in the generated limited optical lattice are arranged according to a specific rule, the number of the light spots is limited and controllable, and optical lattice defects can be generated by controlling parameters; the generated controllable and adjustable limited space optical lattice with the optical lattice defects can be applied to optical control of various particles.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to an optical system for generating an arbitrary-order alternating optical vortex array and an adjustable finite light lattice with defects. Background technique [0002] The optical vortex has a phase singularity, where the phase is uncertain, and its amplitude and light intensity are zero, forming a light intensity distribution of a dark hollow structure; there is a spiral phase term in the phase of the vortex light field It means that each photon carries The orbital angular momentum of , where l is the topological charge of the optical vortex, is the azimuth angle, is the reduced Planck constant. The properties of optical vortex with dark hollow structure and orbital angular momentum can be applied in the fields of information transmission, image processing and optical micro-manipulation. [0003] The optical vortex array is an array structure composed of multiple optica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/09
CPCG02B27/09G02B27/0944G02B27/0927G02B26/06G01J1/0411G01J1/0429G01J1/0437G03H1/2294G03H2001/0077G01J11/00G02B27/286G03H1/0005G03H1/22G03H2225/34G21K1/04G21K1/06
Inventor 王立刚刘大东
Owner ZHEJIANG UNIV
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