Method and device for producing diffraction-free Bessel beam array in random order based on phase hologram

Abstract

The invention relates to a method and a device for producing diffraction-free Bessel beam array in random order based on phase hologram, which overcomes the technical defects that the existing method is complex and the service efficiency of light energy is low; the method has the following schemes: a beam of monochromatic plane light waves is used for irradiating a group of phase hologram with the same characteristic value arranged according to the design requirement in a space light modulator; a unique bright ring with centralized energy is produced after the hologram is performed with Fourier transform; the bright ring is filtered through an annular space filter; and Fourier transform is performed again so as to generate diffraction-free Bessel beam array. The device comprises a light wave beam expanding alignment lens group, a space light modulator, a Fourier lens I, an annular space filter and a Fourier lens II that are arranged in sequence along the transmitting direction of the light path. The method and the device have the following advantages: the use efficiency of energy is high; according to the need, the phase hologram in the space light modulator is changed and written so that the diffraction-free Bessel beam array in random order and at random position can be obtained.

Description

Technical field [0001] The invention relates to an optical information processing technology, in particular to a method and device for generating an arbitrary order non-diffraction Bessel beam array based on a phase hologram. The non-diffraction Bessel beam array can be used in three-dimensional measurement, optical tweezers , multi-particle manipulation and optical vortex and other fields have a wide range of applications. Background technique [0002] Diffraction of light is a common physical phenomenon in nature, which almost affects the propagation of all traditional wave fields. People are trying to find a new light field - non-diffraction light. Until the 1950s, Mcleod studied the beam propagation characteristics of the conical lens, and pointed out that the lens is different from the traditional lens. When the plane incident light wave passes through the lens, the distribution of the transverse light field in the specific propagation range behind it There is basicall...

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Problems solved by technology

[0006] In order to overcome the technical shortcomings of the existing method of generating arbitrary-order non-diffraction Bessel beams and beam arrays, which are complex and the efficiency of light energy use is low, the present invention discloses a method for generating arbitrary-order non-diffraction Bessel beams based on phase holograms. Array method and device thereof

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