CN105807431B - The optical system of accuracy controlling hollow beam size - Google Patents
The optical system of accuracy controlling hollow beam size Download PDFInfo
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- CN105807431B CN105807431B CN201610297276.XA CN201610297276A CN105807431B CN 105807431 B CN105807431 B CN 105807431B CN 201610297276 A CN201610297276 A CN 201610297276A CN 105807431 B CN105807431 B CN 105807431B
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- circumferential weld
- hollow beam
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- laser
- diameter
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0972—Prisms
Abstract
The invention discloses a kind of optical systems of accuracy controlling hollow beam size, it includes optical platform, it is placed with laser on the optical platform, is sequentially placed the adjustable circumferential weld of collimating and beam expanding system, diameter, rotating ground glass, thin lens and axicon along the optical path of the laser.The mode that optical system through the invention can use change circumferential weld diameter accurately adjusts the size of hollow beam, provides succinctly to obtain the hollow beam of size adjustable, effective new way；Strong means are provided for the various sizes of particle of active manipulation.The advantages that optical system is related to that optical element is few, and structure is simple, is easy to build and debug, easy to operate, and accurate to hollow beam size Control.Therefore, it has a vast market foreground in practical applications.
Description
Technical field
The present invention relates to optical field, the optical system of specifically a kind of accuracy controlling hollow beam size.
Background technique
Hollow beam is a kind of annular beam that light intensity is zero in the transmit direction.When the light beam is used for particle capture,
Has many advantages, such as non-contact, not damaged and low disturbance, to get more and more people's extensive concerning.Eckerskorn in 2013 et al.
It proposes using hollow beam as the scheme of laser catheter, and experimentally successfully realizes the capture and guiding to particle；2015
Porfirev et al. is successfully realized the imprison to carbon nano-particle in air using hollow beam.Turpi n in 2015 etc. is mentioned
Out with blue detuning ring of light cooling and imprison87Rb atom boson-einstein condensation new departure, and obtained in related experiment
Verifying.Therefore the generation of hollow beam and application are had been a hot spot of research.
In order to obtain the hollow beam of suitable practical application, scientists are largely explored, and obtain hollow beam
New departure is also constantly suggested.It is generated at present there are many hollow beams, such as quarter wave plate 14 phase-plate method, Fiber Optic Sensor, helical phase
Plate method, twin shaft pyramid method, computer-generated hologram method etc., but the size of hollow beam produced by these methods is mostly difficult to control, nothing
Method flexibly captures the particle different from manipulation size, limits their practical application.
Summary of the invention
The purpose of the present invention is to provide a kind of optical systems of control accurate hollow beam size, can be convenient and accurate
Ground hollow regulating beam sizes.
To achieve the goals above, the present invention adopts the following technical scheme:
The optical system of accuracy controlling hollow beam size, including optical platform are placed with laser on the optical platform,
The adjustable circumferential weld of collimating and beam expanding system, diameter, rotating ground glass, thin lens and axis are sequentially placed along the laser optical path of the laser
Pyramid；Wherein, beamwidth of the laser beam after collimating and beam expanding system is greater than the diameter of circumferential weld, and the slit width of circumferential weld is much smaller than circumferential weld
Diameter, circumferential weld nestle up rotating ground glass, and rotating ground glass is equal to the focal length of thin lens at a distance from thin lens.
After adopting the above scheme, the laser beam after expanding generates incoherent quasi- single after circumferential weld and rotating ground glass
The annular light source of color；After thin lens focuses, Bezier-Xie Er model beams are generated；Using axicon line focus, in axis
Hollow beam is generated behind pyramid.The accurate adjustable of hollow beam size is realized by way of changing circumferential weld diameter.This optics
System structure is simple, it is easy to operate and can to hollow beam size carry out control accurate the advantages that；Therefore, which can be flexible
Capture various sizes of particle, and the particle-capture being suitable under various complex environments.There is extensive city in practical applications
Field prospect.
Detailed description of the invention
Fig. 1 is the component devices figure of optical system of the present invention；
Fig. 2 is the light path schematic diagram of optical system of the present invention；
The structural schematic diagram of circumferential weld in Fig. 3 present invention；
Fig. 4 is the variation relation figure of hollow beam and circumferential weld slit width in the present invention.
Specific embodiment
In order to which the technical solution of present system is explained further, below by specific embodiment come to present system into
Row elaborates.
The optical system of accuracy controlling hollow beam size of the invention, as shown in Figure 1, including optical platform 1, optics is flat
It is provided with He-Ne laser 2 on platform, is sequentially placed short focal length lens 3, long-focus lens 4, straight along the optical path of He-Ne laser 2
The adjustable circumferential weld 5 of diameter, frosted glass 6, thin lens 8 and axicon 9.It is provided between frosted glass 6 and thin lens 8 for driving hair glass
The fractional motor 7 that glass 6 rotates, 9 rear of axicon are provided with the CCD imaging system of the diameter for measuring generated hollow beam
10。
It is the adjustable circumferential weld 5 of laser 2, short focal length lens 3, long-focus lens 4, diameter, frosted glass 6, fractional motor 7, thin
Mirror 8, axicon 9 and CCD imaging system 10 are positioned on optical platform 1 by the fixed support of bracket 11.
Wherein, beamwidth of the He-Ne laser beam after the beam-expanding system that short focal length lens 3 and long-focus lens 4 form is answered
Greater than the diameter of circumferential weld 5, the slit width of circumferential weld 5 should be much smaller than the diameter D (being specifically shown in Fig. 3) of circumferential weld 5, and circumferential weld 5 nestles up frosted glass
6, and frosted glass 6 should be equal to the focal length of thin lens 8 at a distance from thin lens 8.
When work, as shown in Fig. 2, first opening He-Ne laser 2 and fractional motor 7, laser beam is saturating by short focus
After 4 collimator and extender of mirror 3 and long-focus lens, it is radiated on circumferential weld 5 and the frosted glass 6 of rotation and generates incoherent quasimonochromatic annular
Light source generates Bezier-Xie Er model beams after the focusing of thin lens 8, poly- finally by line of the axicon 8 to JSM light beam
Jiaozhuo hollow beam for generating diverging amplitude very little outward.Diameter by changing circumferential weld 5 controls incoherent circular light
Source size is modulated the spatial coherence distribution of Bezier-Xie Er model light field, to realize to hollow beam size
Accurate control.
As embodiment, we select the focal length f=of the focal length f=15mm of short focal length lens 3, long-focus lens 4
190mm, the slit width of circumferential weld 5 are 0.02mm, the focal length f=200mm of thin lens 8, base angle γ=1 ° of axicon 9, axicon 9
Refractive index n=1.458.When experiment, optical system is built according to the element orders of Fig. 1；The diameter of circumferential weld 5 takes 1 respectively, 2,3,4,
5,6mm, and measure the diameter for generating hollow beam at different distance with CCD imaging system 10 after axicon 9, it is shown in Table 1.
The different size circumferential welds of table 1 generate the size of hollow beam on different Z planes
By the ring of light diameter of Z planes different in table 1 and circumferential weld diameter respectively divided by the maximum value of every a line, that is, returned
One change processing, and data are plotted in the curve graph that abscissa is circumferential weld diameter, see Fig. 4.As can be seen from Figure 4, empty after normalization
Heart ring of light size is changed linearly with circumferential weld, while this variation tendency is unrelated with position, and is changed with circumferential weld after normalization
Situation is consistent.Through analytical table 1 it is not difficult to find that on same Z plane, the holding of the ratio and hollow beam of variation front and back circumferential weld
Unanimously.Easily Z plane hollow beam can be quantitatively described with the situation of change of circumferential weld for this rule, to realize to sky
The accuracy controlling of heart beam sizes.
The optical system, which will be captured and be manipulated for different sized particles, as a result, opens new gate, and market prospects are also
It is very wide.
The product form and style of above-described embodiment and schema and non-limiting present system, any technical field
The appropriate changes or modifications that those of ordinary skill does it all should be regarded as the patent category for not departing from present system.
Claims (1)
1. the optical system of accuracy controlling hollow beam size, it is characterised in that: including optical platform, placed on the optical platform
Have laser, along the laser optical path of the laser be sequentially placed the adjustable circumferential weld of collimating and beam expanding system, diameter, rotating ground glass,
Thin lens and axicon；Wherein, beamwidth of the laser beam after collimating and beam expanding system is greater than the diameter of circumferential weld, and the diameter of circumferential weld is
50 times, 100 times, 150 times, 200 times, 250 times or 300 times of the slit width of circumferential weld, circumferential weld nestle up rotating ground glass, rotate hair glass
Glass is equal to the focal length of thin lens, base angle γ=1 of axicon at a distance from thin lenso, the refractive index n=1.458 of axicon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610297276.XA CN105807431B (en) | 2016-05-06 | 2016-05-06 | The optical system of accuracy controlling hollow beam size |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610297276.XA CN105807431B (en) | 2016-05-06 | 2016-05-06 | The optical system of accuracy controlling hollow beam size |
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| CN105807431A CN105807431A (en) | 2016-07-27 |
| CN105807431B true CN105807431B (en) | 2019-03-26 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110058416B (en) * | 2018-11-13 | 2023-05-26 | 首都师范大学 | Device and method for generating long-distance stable transmission Bessel light beam |
| CN110967842B (en) * | 2019-11-11 | 2021-08-06 | 长春理工大学 | Local hollow light beam free opening and closing system based on optical tweezers technology |
| CN111426919A (en) * | 2020-04-08 | 2020-07-17 | 国网山西省电力公司电力科学研究院 | Basin-type insulator detection device based on laser-induced ultrasound |
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