CN104035200A - Method for generating abnormal hollow beams and device thereof - Google Patents
Method for generating abnormal hollow beams and device thereof Download PDFInfo
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- CN104035200A CN104035200A CN201410260038.2A CN201410260038A CN104035200A CN 104035200 A CN104035200 A CN 104035200A CN 201410260038 A CN201410260038 A CN 201410260038A CN 104035200 A CN104035200 A CN 104035200A
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- abnormal hollow
- light modulator
- spatial light
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- hollow beam
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Abstract
The invention discloses a method for generating abnormal hollow beams and a device thereof. The method comprises the following steps: emitting Gauss beams by a laser, and adjusting the strength of the Gauss beams and the sizes of light spots through an attenuation sheet and a beam expanding mirror; performing optical field modulation and control on the beams obtained after adjustment through a spatial light modulator which loads a computer-generated holography sheet on a liquid crystal display screen, wherein the computer-generated holography sheet comprises the wavelength of incident light and the electric field distribution information of the abnormal hollow beams at a position where the transmission distance is zero; intercepting first-grade diffraction beams emitted by the spatial light modulator by using a circular aperture to obtain abnormal hollow beams. According to the technical scheme, the abnormal hollow beams are generated by the Gauss beams, the principle is simple, and the method is easy to implement. The provided device for generating abnormal hollow beams is simple in structure, and is low in manufacturing cost. Other special optical elements are not needed, adjustment is easy, and the device stability is high.
Description
Technical field
The present invention relates to a kind of method and device thereof that produces abnormal hollow beam (Anomalous Hollow Beam), the light beam producing can be applicable to the fields such as atom optics, free space optical communication, scale-of-two optics, optics particle capture and medical biotechnology.
Background technology
A kind of annular beam that central light strength (or axial strength) is zero on the direction of propagation is called " hollow beam " (or " dark hollow beam ").Such light beam is except the general parameters with light beam is (as frequency
, power
p 0 and the angle of divergence
α) outside, also have some special parameters, as: blackening size (
dSS), width of light beam (
w dHB ), beam radius (
r 0 ) and width-diameter ratio (
wRR) etc.
The type of hollow beam has a lot, and dissimilar have different beam characteristicses and a special using value thereof.For example, the preparation that hollow Gaussian beam can be used for studying effective generation of higher hamonic wave and the multiphoton ionization of atom and secretly restraints Magneto-Optical Trap.The hollow beam that some are dispersed naturally, the hollow beam distributing as Laguerre-Gaussian beam, bagel type hollow beam, mould output hollow beam and double gauss can be used for realizing the optics imprison of microscopic particle and the laser guiding of four-dimensional manipulation and cold atom, funnel, cooling with imprison etc.Due to beam propagation unchangeability, the Bezier-Gaussian beam of high-order and high-order
mathieuhollow beam can be used for guiding and collimation microscopic particle, even produces cold atomic beam and realizes atomic beam photolithography.
Stanford Univ USA in 2005
wumention the earliest and in Du Ke storage ring, observed abnormal hollow electron beam Deng people: an electron beam being formed by outside bright ring and oval core.This transverse instability that can be used for studying light beam with the oval symmetrical abnormal hollow electron beam of oval solid core, for linearity and non-linear particle dynamics in research energy storage ring provide an important instrument.
At optical field, be analogous to above-mentioned abnormal hollow electron beam, document (Y. Cai, " Model for an anomalous hollow beam and its paraxial propagation; " Optics Letters 32 (21), 3179 – 3181 (2007)) the abnormal hollow beam light field of description that the theoretical model of first abnormal hollow beam is similar to proposed, its light field is described as the stack of limited Gauss model and bagel model, and derives its transmission formula:
(1)
Wherein,
with
respectively that light beam exists
xwith
ybeam waist in direction.
2009, fractional fourier transform was introduced into the research to abnormal hollow beam.Soon, there is scholar to study by the transport property of round-meshed ABCD system at free space abnormal hollow beam, and proposed one for studying abnormal hollow beam by convenient and high efficiency approach---the approximate analysis method of ABCD system transport property.2012, the people such as professor Zhao Chengliang combined these two research directions again, and fractional fourier transform system is introduced and had in the ABCD system in aperture (circular hole and square hole), studied more accurately and conveniently the transport property of abnormal hollow beam.In addition, the one order optical system transport property of abnormal hollow beam by imbalance also by scholar's research.
The model of abnormal hollow beam has a lot, for example annular beam, Bessel-Gaussian beam, high-order
mathieulight beam and hollow Gaussian beam etc.The method that produces hollow beam also has a lot, for example: the several different methods such as transverse mode back-and-forth method, geometrical optics approach, spatial filter method.Said method is all very complicated, and cost of manufacture is higher.
Summary of the invention
Problem to be solved by this invention is to overcome the deficiency that prior art exists, provide a kind of principle simple, be easy to realize, there is the production method of the abnormal hollow beam of actual application value, and according to the inventive principle of the method, provide a kind of simple in structure, the device of the abnormal hollow beam of generation cheap for manufacturing cost.
For achieving the above object, the technical solution used in the present invention is to provide a kind of method that produces abnormal hollow beam, comprises the steps:
(1) Gaussian beam is carried out to light intensity attenuation and beam expander processing;
(2) loading calculation hologram sheet in the LCDs of spatial light modulator, carries out light field regulation and control by the Gaussian beam after expanding by spatial light modulator; Described calculation holographic sheet comprises incident light wavelength, the abnormal hollow beam Electric Field Distribution at transmission range z=0 place
e(x, y, 0) information,
，
Wherein,
with
respectively that described abnormal hollow beam light beam exists
xwith
ybeam waist in direction;
(3) intercept the first order diffracted beam by spatial light modulator outgoing, obtain abnormal hollow beam.
Technical solution of the present invention also comprises provides a kind of device that produces abnormal hollow beam, and the Gaussian beam that laser instrument sends, through intensity and the spot size of attenuator and beam expanding lens adjustment Gaussian beam; The light beam that obtains after adjusting is carried out to light field regulation and control by spatial light modulator, loading calculation hologram sheet in the LCDs of described spatial light modulator, calculation holographic sheet comprises incident light wavelength, the abnormal hollow beam Electric Field Distribution at transmission range z=0 place
e(x, y, 0) information,
，
Wherein,
with
being respectively described abnormal hollow beam exists
xwith
ybeam waist in direction; Intercept the first order diffracted beam by spatial light modulator outgoing with circular hole diaphragm again, obtain abnormal hollow beam.
Laser instrument of the present invention is He-Ne laser instrument; Described attenuator is circular graded density optical filter; Described spatial light modulator is transmission-type spatial light modulator.
The light distribution that the present invention produces abnormal hollow beam and can be observed and be taken by measurement mechanism abnormal hollow beam, this measurement mechanism comprises convex lens, beam distribution instrument and coupled computing machine.
Due to the utilization of technique scheme, compared with prior art, of the present invention have a following advantages:
1, technical solution of the present invention directly utilizes Gaussian beam to produce abnormal hollow beam, and principle is simple, easily realizes;
The generation device of the abnormal hollow beam 2, providing is simple in structure, low cost of manufacture;
3, need to be by other special optical element, be easy to adjust, device stability is good.
Brief description of the drawings
Fig. 1 is the structural representation of a kind of experimental provision that produces abnormal hollow beam that example of the present invention provides;
Fig. 2 is the calculation holographic sheet loading in spatial light modulator in the embodiment of the present invention;
Fig. 3 is the surface of intensity distribution of the abnormal hollow beam of the generation that measures in the embodiment of the present invention.
In Fig. 1: 1, He-Ne laser instrument; 2, attenuator; 3, beam expanding lens; 4, spatial light modulator; 5, circular hole diaphragm; 6, convex lens; 7, beam distribution instrument; 8,9, computing machine.
Embodiment
Below in conjunction with drawings and Examples, technical solution of the present invention is further described.
Embodiment 1:
Referring to accompanying drawing 1, it is the structural representation of a kind of abnormal hollow beam generation device that provides of the present embodiment.This device comprises: laser instrument 1, attenuator 2, beam expanding lens 3, spatial light modulator 4, circular hole diaphragm 5, convex lens 6, laser beam analyzer 7, computing machine 8 and 9.
For He-Ne laser instrument, (power is 5mW to laser instrument 1, wavelength is 632.8nm), send Gaussian beam by laser instrument 1, adjust light intensity and the spot size of Gaussian beam through attenuator 2 and beam expanding lens 3, described attenuator 2 is circular graded density optical filter, and described beam expanding lens 3 is combined by two convex lens that are parallel to each other; Gaussian beam after adjustment is through spatial light modulator 4, described spatial light modulator 4 is transmission-type spatial light modulator (BQ-SLM1024), by Bootload calculation holographic sheet, the Gaussian beam after expanding is carried out to light field regulation and control by computing machine 8, referring to accompanying drawing 2, it be the present embodiment provide for light beam being carried out to the calculation holographic sheet of light field regulation and control, calculate and produce by MATLAB mathematical software, write according to the light distribution formula (1) in summary of the invention, the Electric Field Distribution expression formula that abnormal hollow beam goes out at transmission range z=0 is:
(1)
Wherein,
with
respectively that light beam exists
xwith
ybeam waist in direction.Referral procedure is as follows:
clear;
clc;
[x, y]=meshgrid (linspace (5,5,2000)); % calculation holographic chip size
W0x=1; Girdling the waist in %x direction
W0y=1; Girdling the waist in %y direction
Lambda=632.8e-6; % wavelength
K=2*pi/lambda; % wave-number vector
D=500; % grating constant
EE1=(-2+8*x.^2/w0x^2+8*y.^2/w0y^2).*exp(-x.^2/w0x^2-y.^2/w0y^2);
EE2=exp(i*x*d);
II=(EE2+EE1).*conj(EE2+EE1);
figure(1)
Imshow (II, []) % Display control computer hologram sheet
The profile of calculation holographic sheet is the profile of abnormal hollow beam---outside bright ring and center circle core, its major parameter is w0x, w0y and lambda, represent respectively light beam
x,
ybeam waist in direction and the wavelength of light beam, in the time that w0x and w0y equate, calculation holographic sheet be circular, when w0x and w0y be not etc. time, calculation holographic sheet is ellipse.Wavelength lambda will with the consistent wavelength that incides spatial light modulator laser.
Apply the calculation holographic sheet that above program produces, for light beam is carried out to light field regulation and control; After regulation and control, utilize circular hole diaphragm 5 to intercept first order diffracted beam, obtain abnormal hollow beam; Convex lens 6, beam distribution instrument 7 and coupled computing machine 9 composition measuring apparatus for measurement, for observing and take the light distribution of abnormal hollow beam.
Utilize the said apparatus that the present embodiment provides to produce and measure abnormal hollow beam, concrete operation step is as follows:
1, send Gaussian beam by laser instrument 1, regulate beam intensity through attenuator 2, then regulate spot size through beam expanding lens 3, obtain being convenient to the Gaussian beam expanding that experiment is used.
2, the Gaussian beam expanding arrives spatial light modulator 4, software program by computing machine 8 is loaded into calculation holographic sheet in the LCDs of spatial light modulator 4, position and the size of calculation holographic sheet on the position of the LCDs of adjusting spatial light modulator 4 and display screen, described Gaussian beam is just in time radiated on calculation holographic sheet, carries out the rear outgoing of light field regulation and control.As accompanying drawing 2 is calculation holographic sheet used in the present embodiment.
3, by the light beam generation diffraction of spatial light modulator outgoing, intercept first order diffracted beam by circular hole diaphragm 5, obtain abnormal hollow beam.
4, convex lens 6, beam distribution instrument 7 and coupled computing machine 9 for measurement, for observing and take the light distribution of abnormal hollow beam.Referring to accompanying drawing 3, it is the surface of intensity distribution that in the present embodiment, beam distribution instrument is taken the abnormal hollow beam obtaining.
Claims (5)
1. a method that produces abnormal hollow beam, is characterized in that comprising the steps:
(1) Gaussian beam is carried out to light intensity attenuation and beam expander processing;
(2) loading calculation hologram sheet in the LCDs of spatial light modulator, carries out light field regulation and control by the Gaussian beam after expanding by spatial light modulator; Described calculation holographic sheet comprises incident light wavelength, the abnormal hollow beam Electric Field Distribution at transmission range z=0 place
e(x, y, 0) information,
，
Wherein,
with
respectively that described abnormal hollow beam light beam exists
xwith
ybeam waist in direction;
(3) intercept the first order diffracted beam by spatial light modulator outgoing, obtain abnormal hollow beam.
2. a device that produces abnormal hollow beam, is characterized in that: the Gaussian beam that laser instrument sends, through intensity and the spot size of attenuator and beam expanding lens adjustment Gaussian beam; The light beam that obtains after adjusting is carried out to light field regulation and control by spatial light modulator, loading calculation hologram sheet in the LCDs of described spatial light modulator, calculation holographic sheet comprises incident light wavelength, the abnormal hollow beam Electric Field Distribution at transmission range z=0 place
e(x, y, 0) information,
，
Wherein,
with
being respectively described abnormal hollow beam exists
xwith
ybeam waist in direction; Intercept the first order diffracted beam by spatial light modulator outgoing with circular hole diaphragm again, obtain abnormal hollow beam.
3. a kind of device that produces abnormal hollow beam according to claim 2, is characterized in that: described laser instrument is He-Ne laser instrument.
4. a kind of device that produces abnormal hollow beam according to claim 2, is characterized in that: described attenuator is circular graded density optical filter.
5. a kind of device that produces abnormal hollow beam according to claim 2, is characterized in that: described spatial light modulator is transmission-type spatial light modulator.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111028641A (en) * | 2019-12-10 | 2020-04-17 | 西安交通大学 | Gaussian light comprehensive experiment teaching system and experiment method thereof |
| CN112882243A (en) * | 2021-02-02 | 2021-06-01 | 浙江师范大学 | Method for constructing elliptical spiral Mathieu vortex beam based on phase stabilization method |
| CN113747149A (en) * | 2021-08-26 | 2021-12-03 | 浙江大华技术股份有限公司 | Method and device for detecting abnormality of optical filter, electronic device, and storage medium |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111028641A (en) * | 2019-12-10 | 2020-04-17 | 西安交通大学 | Gaussian light comprehensive experiment teaching system and experiment method thereof |
| CN112882243A (en) * | 2021-02-02 | 2021-06-01 | 浙江师范大学 | Method for constructing elliptical spiral Mathieu vortex beam based on phase stabilization method |
| CN113747149A (en) * | 2021-08-26 | 2021-12-03 | 浙江大华技术股份有限公司 | Method and device for detecting abnormality of optical filter, electronic device, and storage medium |
| CN113747149B (en) * | 2021-08-26 | 2024-04-16 | 浙江大华技术股份有限公司 | Abnormality detection method and device for optical filter, electronic device and storage medium |
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Application publication date: 20140910 |