CN102289075B - Device and method for generating polarization-state-adjustable hollow light beam - Google Patents
Device and method for generating polarization-state-adjustable hollow light beam Download PDFInfo
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- CN102289075B CN102289075B CN201110219312.8A CN201110219312A CN102289075B CN 102289075 B CN102289075 B CN 102289075B CN 201110219312 A CN201110219312 A CN 201110219312A CN 102289075 B CN102289075 B CN 102289075B
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Abstract
The invention discloses a device and a method for generating a polarization-state-adjustable hollow light beam. The device comprises a laser light source, wherein a polarizer, a quarter-wave plate, a microscope objective, optical fiber, a collimation lens and a multi-dimensional adjustment frame are sequentially arranged along the laser output direction of the laser light source; the microscope objective is fixed on a clamp of the multi-dimensional adjustment frame; an input end of the optical fiber is fixed on an optical fiber bracket of the multi-dimensional adjustment frame; an end face of the input end is positioned on a rear focal point of the microscope objective; the end face of an output end of the optical fiber is positioned on a front focal point of the collimation lens; the optical fiber is few-mode optical fiber; and the multi-dimensional adjustment frame is provided with a first knob, a second knob and a third knob, which respectively adjust horizontal and pitching angles of the microscope objective by the clamp to realize off-axis incidence of a focused light beam on the optical fiber. The invention has the advantages that: the device is simple in structure and convenient to operate; and the high-quality polarization-state-adjustable hollow light beam can be output.
Description
Technical field
The present invention relates to light beam, particularly a kind of generation device of polarization-state-adjustable hollow light beam and method.
Background technology
In recent years, along with the development of microscopic particle optical acquisition and ultrahigh resolution microscopy, the inhomogeneous hollow beam of polarization state space obtains increasing attention.The method of obtaining the inhomogeneous hollow beam of polarization state space is mainly divided into two kinds of active method and passive ways.Wherein comparatively be typically and adopt photon crystal grating mirror as laser instrument output coupling mirror, utilize rare earth ion doped optical fiber to obtain the active scheme of this light beam as gain media.Can obtain the Laser output of the inhomogeneous hollow beam of polarization state space of higher-wattage by this active scheme, and the polarization purity of light beam is also very high, but this system is comparatively complicated, and operating personnel's professional technical is had relatively high expectations.Components and parts adopt optical precision instrument more, make whole system expensive, and the easy introducing interference of active system self is affected the stability of system.Up to now, the beam quality (circular symmetry, power stability) that this scheme obtains is still not high, makes to utilize the hollow beam that the method obtains also to need an evolution for microscopic particle optical acquisition and ultrahigh resolution microscopy.
Summary of the invention
The present invention is directed to all drawbacks of above-mentioned active method, propose a kind of generation device and method of polarization-state-adjustable hollow light beam.Operation is simple for the method, and apparatus structure is simple, adopts cheap optical device, can realize the inhomogeneous hollow beam output of high-quality polarization state space.
Technical solution of the present invention is as follows:
A kind of generation device of polarization-state-adjustable hollow light beam, feature comprises LASER Light Source in this device, along the Laser output direction of this LASER Light Source, the polarizer successively, quarter-wave plate, microcobjective, optical fiber, collimation lens and multidimensional adjustment rack, described microcobjective is fixed on the fixture of described multidimensional adjustment rack, the input termination of described optical fiber is fixed on the structure of fiber_optic of described multidimensional adjustment rack and the end face of this input end is positioned in the back focus of described microcobjective, the end face of the output terminal of described optical fiber is positioned at the front focus of described collimation lens, described optical fiber is that core diameter is thinner, only can support the less fundamental mode optical fibre of the low step mode of laser wavelength of incidence, described multidimensional adjustment rack also has the first knob, the second knob and the 3rd knob respectively by fixture the level to described microcobjective and luffing angle adjust, with realize focus on after light beam to optical fiber from axle incident.
Described optical fiber is only to support two low step mode LP01 moulds of laser wavelength of incidence and the less fundamental mode optical fibre of LP02 mould.
On the output light path of described collimation lens, be also provided with polaroid analyze and ccd detector, the imaging surface of described ccd detector is positioned on the focal plane of described collimation lens.
Utilize the generation device of above-mentioned polarization-state-adjustable hollow light beam to produce the method for hollow beam, its feature is that the method comprises the following steps:
1. on the output light path of described collimation lens, set gradually polaroid analyze and ccd detector, the imaging surface of described ccd detector is positioned on the focal plane of described collimation lens;
2. adjust the first knob, the second knob and the 3rd knob of described multidimensional adjustment rack, level and luffing angle by fixture to described microcobjective are adjusted, with realize focus on after light beam to optical fiber from axle incident, thereby suppress exciting of LP01 mould in described optical fiber, realize the output of hollow beam;
3. the anglec of rotation of the quarter-wave plate described in rotation is to realize the hollow beam that optionally excites radial polarisation, orientation polarization and intermediate state polarization:
The optical axis that the described quarter-wave plate of rotation makes this wave plate is parallel with the polarization direction of the described polarizer, regulate the 3rd knob on described multidimensional adjustment rack, make described ccd detector can observe hollow beam clearly, now finely tune the second knob the described polaroid analyze of rotation, observe the hot spot pattern after analyzing by described ccd detector, when the concealed wire in output beam is always vertical with the polarization direction of described polaroid analyze, now the light beam of output is radial polarisation light;
Rotating described quarter-wave plate, to make the angle of the optical axis of this wave plate and the polarization direction of the described polarizer be orientation polarization angle θ
0time, regulate the 3rd knob on described multidimensional adjustment rack to make described ccd detector can observe hollow beam clearly, now finely tune the second knob the described polaroid analyze of rotation, observe the hot spot pattern after analyzing by ccd detector, always parallel with the polarization direction of described polaroid analyze when the concealed wire in output beam, now the light beam of output is orientation polarized light;
Rotating described quarter-wave plate, to make the angle of the optical axis of this wave plate and the polarization direction of the described polarizer be 0 °～θ
0between when unspecified angle, regulate the 3rd knob on described multidimensional adjustment rack to make described ccd detector can observe hollow beam clearly, now finely tune the second knob the described polaroid analyze of rotation, observe the hot spot pattern after analyzing by ccd detector, when the concealed wire in output beam is a certain angle with the polarization direction of described polaroid analyze always, now the light beam of output is intermediate state light beam.
Described orientation polarization angle θ
0because different optical fiber changes to some extent, θ
0～5 °
Technique effect of the present invention:
1,, because the present invention all adopts passive device, the disturbing factor that system self is introduced is less, and output facula quality is greatly improved;
2, in the whole adjustment process of device, need the element adjusted less, regulates very easyly, can realize the inhomogeneous hollow beam of high-quality polarization state space and export.Less demanding to professional skill.
3, the device that the method adopts is simultaneously commercial devices, cheap, and expense can effectively be controlled.
Brief description of the drawings
Fig. 1 is the light channel structure schematic diagram of a most preferred embodiment of apparatus of the present invention.
Fig. 2 is multidimensional adjustment rack 12 and the micro objective 4 of assembling and the syndeton schematic diagram of optical fiber 5 incident terminations 8
Fig. 3 shows the present invention and tests light intensity and the polarization state distribution schematic diagram of the radial polarisation, orientation polarization and the intermediate state polarization that obtain.
Light beam light intensity and the polarization state distribution schematic diagram of Fig. 3 (a) for utilizing the radial polarisation of the inventive method acquisition to export.
Fig. 3 (b) is light beam light intensity and the polarization state distribution schematic diagram that utilizes the orientation polarization output of the inventive method acquisition.
Fig. 3 (c) is light intensity and the polarization state distribution schematic diagram that utilizes the intermediate state polarization output of the inventive method acquisition.
Embodiment
Below in conjunction with the good accompanying drawing of embodiment, the invention will be further described, but should not limit the scope of the invention with this.
First refer to Fig. 1, Fig. 1 is the light channel structure schematic diagram of a most preferred embodiment of apparatus of the present invention.As seen from the figure, the generation device of polarization-state-adjustable hollow light beam of the present invention, this device comprises LASER Light Source 1, along the Laser output direction of this LASER Light Source 1, the polarizer 2 successively, quarter-wave plate 3, microcobjective 4, optical fiber 5, collimation lens 6 and multidimensional adjustment rack 12, described microcobjective 4 is fixed on the fixture 10 of described multidimensional adjustment rack 12, the input termination 8 of described optical fiber 5 is fixed on the structure of fiber_optic 11 of described multidimensional adjustment rack 12 and the end face of this input end 8 is positioned in the back focus of described microcobjective 4, the end face of the output terminal 9 of described optical fiber 5 is positioned at the front focus of described collimation lens 6, described optical fiber 5 is that core diameter is thinner, only can support the less fundamental mode optical fibre of the low step mode of laser wavelength of incidence, described multidimensional adjustment rack 12 also has the first knob 13, the second knob 14 and the 3rd knob 15 respectively by fixture 10 level to described microcobjective 4 and luffing angle adjust, with realize focus on after light beam to optical fiber from axle incident.On the output light path of described collimation lens 6, be also provided with polaroid analyze 16 and ccd detector 7, the imaging surface of described ccd detector 7 is positioned on the focal plane of described collimation lens 6.
Described optical fiber 5 is only to support two low step mode LP01 moulds of laser wavelength of incidence and the less fundamental mode optical fibre of LP02 mould.
The present invention is the passive way that obtains the inhomogeneous hollow beam output of high-quality polarization state space with optical fiber as mode selector.
In this scheme, optical fiber 5 is as mode selector, and the optical fiber core diameter of selection is thinner, only can support two low step mode LP01 moulds of laser wavelength of incidence and the less fundamental mode optical fibre of LP02 mould.Although select this optical fiber that system capacity conversion efficiency is declined, but the model selection ability of optical fiber strengthens, this is three degenerate mode of equal value (TE01 moulds due to LP02 mould, TM01 mould, HE11 mould) in comprise inhomogeneous pattern (the TE01 mould of polarization state space that need to excite, TM01 mould), only need effectively to suppress a few pattern, can realize the output of the inhomogeneous hollow beam of specific polarization state space.Adjusting the first knob 13, the second knob 14 and the 3rd knob 15 on described multidimensional adjustment rack 12 are for adjusting level and the luffing angle of microcobjective 4, with realize focus on after light beam to optical fiber from axle incident, thereby suppress exciting of LP01 mould in optical fiber 5, realize the output of hollow beam.For Polarization-Sensitive characteristic, before micro objective 4, add the adjustment of quarter-wave plate 3 for the polarization state of the linearly polarized light to incident based on ordinary optic fibre, effectively to excite the inhomogeneous hollow beam of required polarization state space.Can realize and optionally excite radial polarisation by control the level of microcobjective 4 and the anglec of rotation of luffing angle and quarter-wave plate 3 simultaneously, the hollow beam of orientation polarization and intermediate state polarization, radial polarisation herein refer to light space each point polarization state all along circle radial direction (as shown in Fig. 3 (a)), orientation polarization refer to light space each point polarization state all along circle tangential direction (as shown in Fig. 3 (b)), intermediate state polarization refers to that the polarization state of space each point of light is between the direction radially and between orientation polarization (as shown in Fig. 3 (c)).Can realize by controlling the inclination angle of micro objective 4 and the anglec of rotation of quarter-wave plate 3 between the hollow beam of radial polarisation, orientation polarization and intermediate state polarization and mutually switching.
First utilize coordinate target screen to collimate to LASER Light Source 1, the LASER Light Source while is as the excitation source of collimated light source and optical fiber.Utilize the LASER Light Source 1 of collimation to carry out coaxial adjustment to the polarizer 2 in light path, quarter-wave plate 3, microcobjective 4.After this incident end 8 of optical fiber is fixed on to the optical fiber fixed support 11 on multidimensional adjustment rack 12, and regulates the incident end 8 of optical fiber to make its end face be positioned at the focus of microcobjective 4, now reach optimum coupling, optical fiber emergent light power is the highest.Regulate the position of fiber-optic output 9 to make its end face be positioned at the focal plane of described collimation lens 6, now regulate level, the luffing angle of collimation lens 6 to make the outgoing beam collimation of fiber-optic output 9.At the rear placement polaroid analyze 16 of collimation lens 6 and ccd detector 7, the imaging surface of described ccd detector 7 is positioned on the focal plane of described collimation lens 6.Utilize CCD image device 7 to observe outgoing beam.
Utilize the generation device of above-mentioned polarization-state-adjustable hollow light beam to produce the method for hollow beam, comprise the following steps:
1. on the output light path of described collimation lens 6, set gradually polaroid analyze 16 and ccd detector 7, the imaging surface of described ccd detector 7 is positioned on the focal plane of described collimation lens 6;
2. adjust the first knob 13, the second knob 14 and the 3rd knob 15 of described multidimensional adjustment rack 12, level and luffing angle by fixture 10 to described microcobjective 4 are adjusted, with realize focus on after light beam to optical fiber from axle incident, thereby suppress exciting of LP01 mould in described optical fiber 5, realize the output of hollow beam;
3. the anglec of rotation of the quarter-wave plate 3 described in rotation is to realize the hollow beam that optionally excites radial polarisation, orientation polarization and intermediate state polarization:
The optical axis that the described quarter-wave plate 3 of rotation makes this wave plate is parallel with the polarization direction of the described polarizer 2, regulate the 3rd knob 15 on described multidimensional adjustment rack 12 to make described ccd detector 7 can observe hollow beam clearly, now finely tune the second knob 14 the described polaroid analyze 16 of rotation, (be set as 22.5 ° of step pitches, rotate a circle), observe the hot spot pattern after analyzing by described ccd detector 7, when the concealed wire in output beam always vertical with the polarization direction of described polaroid analyze 16, now the light beam of output is radial polarisation light, referring to Fig. 3 (a),
Rotating described quarter-wave plate (3), to make the angle of the optical axis of this wave plate and the polarization direction of the described polarizer 2 be orientation polarization angle θ
0time, regulate the 3rd knob 15 on described multidimensional adjustment rack 12 to make described ccd detector 7 can observe hollow beam clearly, now finely tune the second knob 14 the described polaroid analyze 16 of rotation, (be set as 22.5 ° of step pitches, rotate a circle), observe the hot spot pattern after analyzing by ccd detector 7, when the concealed wire in output beam always parallel with the polarization direction of described polaroid analyze 16, now the light beam of output is orientation polarized light, referring to Fig. 3 (b);
Rotating described quarter-wave plate 3, to make the angle of the optical axis of this wave plate and the polarization direction of the described polarizer 2 be 0 °～θ
0between when unspecified angle, regulate the 3rd knob 15 on described multidimensional adjustment rack 12 to make described ccd detector 7 can observe hollow beam clearly, now finely tune the second knob 14 the described polaroid analyze 16 of rotation, (be set as 22.5 ° of step pitches, rotate a circle), observe the hot spot pattern after analyzing by ccd detector 7, when the concealed wire in output beam is a certain angle with the polarization direction of described polaroid analyze 16 always, now the light beam of output is intermediate state light beam, referring to Fig. 3 (c).
Described orientation polarization angle θ
0because different optical fiber changes to some extent, θ
0～5 °
As can be seen here, the present invention, by the second knob 14 and the 3rd knob 15 and the quarter-wave plate 3 of linkage rotation multidimensional adjustment rack 12, can realize the switching between radial polarisation, orientation polarization and intermediate state polarization hollow beam.Use very convenient.
Claims (3)
1. the generation device of a polarization-state-adjustable hollow light beam, be characterised in that this device comprises LASER Light Source (1), multidimensional adjustment rack (12), along the Laser output direction of this LASER Light Source (1), the polarizer (2) successively, quarter-wave plate (3), microcobjective (4), optical fiber (5), collimation lens (6), the sense of rotation of described quarter-wave plate (3) is adjustable, optionally excite radial polarisation to realize, the hollow beam of orientation polarization and intermediate state polarization, described microcobjective (4) is fixed on the fixture (10) of described multidimensional adjustment rack (12), structure of fiber_optic (11) end face upper and this input end (8) that the input termination (8) of described optical fiber (5) is fixed on described multidimensional adjustment rack (12) is positioned in the back focus of described microcobjective (4), the end face of the output termination (9) of described optical fiber (5) is positioned at the front focus of described collimation lens (6), described optical fiber (5) is that core diameter is thinner, only can support two low step mode LP01 moulds of laser wavelength of incidence and the less fundamental mode optical fibre of LP02 mould, described multidimensional adjustment rack (12) also has the first knob (13), the second knob (14) and the 3rd knob (15) are adjusted level and the luffing angle of described microcobjective (4) by fixture (10) respectively, with realize focus on after light beam to optical fiber from axle incident.
2. the generation device of polarization-state-adjustable hollow light beam according to claim 1, it is characterized in that, on the output light path of described collimation lens (6), be also provided with polaroid analyze (16) and ccd detector (7), the imaging surface of described ccd detector (7) is positioned on the focal plane of described collimation lens (6).
3. utilize the generation device of the polarization-state-adjustable hollow light beam described in claim 1 to produce the method for hollow beam, it is characterized in that the method comprises the following steps:
1. on the output light path of described collimation lens (6), set gradually polaroid analyze (16) and ccd detector (7), the imaging surface of described ccd detector (7) is positioned on the focal plane of described collimation lens (6);
2. adjust the first knob (13), the second knob (14) and the 3rd knob (15) of described multidimensional adjustment rack (12), by fixture (10), level and the luffing angle of described microcobjective (4) are adjusted, with realize focus on after light beam to optical fiber from axle incident, thereby exciting of the middle LP01 mould of optical fiber (5) described in suppressing, realizes the output of hollow beam;
3. the anglec of rotation of the quarter-wave plate (3) described in rotation is to realize the hollow beam that optionally excites radial polarisation, orientation polarization and intermediate state polarization:
When the described quarter-wave plate (3) of rotation makes the polarization direction of the optical axis of this wave plate and the described polarizer (2) parallel, regulate the 3rd knob (15) on described multidimensional adjustment rack (12) to make described ccd detector (7) can observe hollow beam clearly, now finely tune the second knob (14) the described polaroid analyze (16) of rotation, observe the hot spot pattern after analyzing by described ccd detector (7), when the concealed wire in output beam always vertical with the polarization direction of described polaroid analyze (16), now the light beam of output is radial polarisation light,
Rotating the angle that described quarter-wave plate (3) makes the polarization direction of the optical axis of this wave plate and the described polarizer (2) is orientation polarization angle θ
0time, regulate the 3rd knob (15) on described multidimensional adjustment rack (12) to make described ccd detector (7) can observe hollow beam clearly, now finely tune the second knob (14) the described polaroid analyze (16) of rotation, observe the hot spot pattern after analyzing by ccd detector (7), always parallel with the polarization direction of described polaroid analyze (16) when the concealed wire in output beam, now the light beam of output is orientation polarized light;
Rotating described quarter-wave plate (3), to make the angle of the polarization direction of the optical axis of this wave plate and the described polarizer (2) be 0 °～θ
0between when unspecified angle, regulate the 3rd knob (15) on described multidimensional adjustment rack (12) to make described ccd detector (7) can observe hollow beam clearly, now finely tune the second knob (14) the described polaroid analyze (16) of rotation, observe the hot spot pattern after analyzing by ccd detector (7), when the concealed wire in output beam is a certain angle with the polarization direction of described polaroid analyze (16) always, now the light beam of output is intermediate state light beam.
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| CN102866501B (en) * | 2012-09-27 | 2014-10-22 | 哈尔滨工程大学 | Emergent light spot strength homogenizing mode-disturbing device for optical fiber |
| CN103197431B (en) * | 2013-03-29 | 2015-04-08 | 光库通讯(珠海)有限公司 | Optical fiber coupler |
| CN104020567A (en) * | 2014-05-13 | 2014-09-03 | 西安电子科技大学 | Hollow light beam converting device |
| US9684125B2 (en) * | 2015-05-14 | 2017-06-20 | Coherent, Inc. | Transport of polarized laser-radiation using a hollow-core fiber |
| CN105700080A (en) * | 2016-04-20 | 2016-06-22 | 江苏宇迪光学股份有限公司 | Fiber coupling system capable of maintaining optical polarization |
| CN111525376B (en) * | 2020-04-30 | 2021-11-02 | 长江师范学院 | Based on TM01Vortex laser generation method for mode light conversion and vortex laser |
| CN111751340B (en) * | 2020-06-24 | 2023-08-11 | 宁波舜宇仪器有限公司 | Beam multiplexing confocal imaging device and imaging method |
| CN112925064A (en) * | 2021-01-22 | 2021-06-08 | 中国科学院微电子研究所 | Multi-beam combined adjusting device and method |
| CN114690318B (en) * | 2022-03-31 | 2023-05-26 | 华中科技大学 | Mode wave plate based on few-mode optical fiber and mode conversion method |
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