CN102289075A - 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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- CN102289075A CN102289075A CN 201110219312 CN201110219312A CN102289075A CN 102289075 A CN102289075 A CN 102289075A CN 201110219312 CN201110219312 CN 201110219312 CN 201110219312 A CN201110219312 A CN 201110219312A CN 102289075 A CN102289075 A CN 102289075A
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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, the generation device and the method for the adjustable hollow beam of particularly a kind of polarization state.
Background technology
In recent years, along with microscopic particle optical acquisition and ultrahigh resolution Microscope technology development, the uneven hollow beam in polarization state space obtains increasing the attention.The method of obtaining the inhomogeneous hollow beam in polarization state space mainly is divided into two kinds of active method and passive ways.Wherein comparatively be typically and adopt the photon crystal grating mirror, utilize rare earth ion doped optical fiber to obtain the active scheme of this light beam as gain media as the laser instrument output coupling mirror.Can obtain the laser output of the inhomogeneous hollow beam in polarization state space of higher-wattage by this active scheme, and the polarization purity of light beam is also very high, but this system design is comparatively complicated, and operating personnel's professional technical is had relatively high expectations.Components and parts adopt optical precision instrument more, make total system cost an arm and a leg, 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 that the hollow beam that utilizes this method to obtain is used for the microscopic particle optical acquisition and the ultrahigh resolution microscopy also needs an evolution.
Summary of the invention
The present invention is directed to all drawbacks of above-mentioned active method, propose the generation device and the method for the adjustable hollow beam of a kind of polarization state.Operation is simple for this method, and apparatus structure is simple, adopts cheap optical device, can realize the uneven hollow beam output of high-quality polarization state space.
Technical solution of the present invention is as follows:
The generation device of the adjustable hollow beam of a kind of polarization state, characteristics comprise LASER Light Source in this device, laser outbound course along this LASER Light Source, be the polarizer successively, quarter-wave plate, microcobjective, optical fiber, collimation lens and multidimensional adjustment rack, described microcobjective is fixed on the anchor clamps 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 on 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 first knob, second knob and the 3rd knob are adjusted the level and the luffing angle of described microcobjective by anchor clamps respectively, with the light beam after realize focusing on to optical fiber from axle incident.
Described optical fiber is only to support two the low step mode LP01 moulds of laser wavelength of incidence and the less fundamental mode optical fibre of LP02 mould.
Also be provided with polaroid analyze and ccd detector on the output light path of described collimation lens, the imaging surface of described ccd detector is positioned on the focal plane of described collimation lens.
Utilize the method for the generation device generation hollow beam of the adjustable hollow beam of above-mentioned polarization state, its characteristics are that this 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 first knob, second knob and the 3rd knob of described multidimensional adjustment rack, by anchor clamps the level and the luffing angle of described microcobjective are adjusted, with the light beam after realize focusing on to optical fiber from axle incident, thereby suppress exciting of LP01 mould in the described optical fiber, realize the output of hollow beam;
The anglec of rotation of 3. rotating described quarter-wave plate is to realize optionally exciting the hollow beam of radial polarisation, orientation polarization and intermediate state polarization:
Rotating described quarter-wave plate makes the optical axis of this wave plate parallel with the polarization direction of the described polarizer, regulate the 3rd knob on the described multidimensional adjustment rack, make described ccd detector can observe hollow beam clearly, finely tune second knob and rotate described polaroid analyze this moment, by the hot spot pattern after the described ccd detector observation analyzing, concealed wire in output beam is vertical with the polarization direction of described polaroid analyze always, and this moment, the light beam of output was radial polarisation light;
Rotating described quarter-wave plate, to make the angle of the polarization direction of the optical axis of this wave plate and the described polarizer be orientation polarization angle θ
0The time, the 3rd knob of regulating on the described multidimensional adjustment rack makes described ccd detector can observe hollow beam clearly, finely tune second knob and rotate described polaroid analyze this moment, by the hot spot pattern after the ccd detector observation analyzing, concealed wire in output beam is parallel with the polarization direction of described polaroid analyze always, and this moment, the light beam of output was the orientation polarized light;
Rotating described quarter-wave plate, to make the angle of the polarization direction of the optical axis of this wave plate and the described polarizer be 0 °～θ
0Between during unspecified angle, the 3rd knob of regulating on the described multidimensional adjustment rack makes described ccd detector can observe hollow beam clearly, finely tune second knob and rotate described polaroid analyze this moment, by the hot spot pattern after the ccd detector observation analyzing, concealed wire in output beam is a certain angle with the polarization direction of described polaroid analyze always, and this moment, the light beam of output was the intermediate state light beam.
Described orientation polarization angle θ
0Because of 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 introduces is less, makes the output facula quality obtain very big raising;
2, need the element adjusted less in Zhuan Zhi the whole adjustment process, regulate very easyly, can realize the uneven hollow beam output of high-quality polarization state space.Less demanding to professional skill.
3, the device that this method adopted simultaneously is commercial devices, cheap, and expense can effectively be controlled.
Description of 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 synoptic diagram of optical fiber 5 incident terminations 8
Fig. 3 shows light intensity and the polarization state distribution schematic diagram that the present invention tests the radial polarisation, orientation polarization and the intermediate state polarization that are obtained.
Light beam light intensity and polarization state distribution schematic diagram that Fig. 3 (a) exports for the radial polarisation of utilizing the inventive method acquisition.
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
The invention will be further described below in conjunction with the good accompanying drawing of embodiment, but should not limit protection scope of the present invention with this.
See also Fig. 1 earlier, 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 the adjustable hollow beam of polarization state of the present invention, this device comprises LASER Light Source 1, laser outbound course along this LASER Light Source 1, be 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 anchor clamps 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 on 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 first knob 13, second knob 14 and the 3rd knob 15 are adjusted by the level and the luffing angle of 10 pairs of described microcobjectives 4 of anchor clamps respectively, with the light beam after realize focusing on to optical fiber from axle incident.Also be provided with polaroid analyze 16 and ccd detector 7 on the output light path of described collimation lens 6, 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 the 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.
At first utilize coordinate target screen that LASER Light Source 1 is collimated, the LASER Light Source while is as the excitation source of collimated light source and optical fiber.Utilize the polarizer 2, quarter-wave plate 3, microcobjective 4 in 1 pair of light path of collimated laser light light source to carry out coaxial adjusting.After this incident end 8 of optical fiber is fixed in the optical fiber fixed support 11 on the multidimensional adjustment rack 12, and the incident end 8 of regulating optical fiber makes its end face be positioned at the focus of microcobjective 4, reach optimum coupling this moment, and optical fiber emergent light power is the highest.The position of regulating fiber-optic output 9 makes its end face be positioned at the focal plane of described collimation lens 6, and level, the luffing angle of regulating collimation lens 6 this moment make the outgoing beam collimation of fiber-optic output 9.Place polaroid analyze 16 and ccd detector 7 in collimation lens 6 backs, the imaging surface of described ccd detector 7 is positioned on the focal plane of described collimation lens 6.Utilize 7 pairs of outgoing beams of CCD image device to observe.
Utilize the method for the generation device generation hollow beam of the above-mentioned adjustable hollow beam of polarization state, 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 first knob 13, second knob 14 and the 3rd knob 15 of described multidimensional adjustment rack 12, level and luffing angle by 10 pairs of described microcobjectives 4 of anchor clamps are adjusted, with the light beam after realize focusing on to optical fiber from axle incident, thereby suppress exciting of LP01 mould in the described optical fiber 5, realize the output of hollow beam;
The anglec of rotation of 3. rotating described quarter-wave plate 3 is to realize optionally exciting the hollow beam of radial polarisation, orientation polarization and intermediate state polarization:
Rotating described quarter-wave plate 3 makes the optical axis of this wave plate parallel with the polarization direction of the described polarizer 2, the 3rd knob of regulating on the described multidimensional adjustment rack 12 15 makes described ccd detector 7 can observe hollow beam clearly, finely tune second knob 14 and rotate described polaroid analyze 16 this moment, (be set at 22.5 ° of step pitches, rotate a circle), by the hot spot pattern after the described ccd detector 7 observation analyzings, concealed wire in output beam is vertical with the polarization direction of described polaroid analyze 16 always, this moment, the light beam of output was radial polarisation light, referring to Fig. 3 (a);
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 orientation polarization angle θ
0The time, the 3rd knob of regulating on the described multidimensional adjustment rack 12 15 makes described ccd detector 7 can observe hollow beam clearly, finely tune second knob 14 and rotate described polaroid analyze 16 this moment, (be set at 22.5 ° of step pitches, rotate a circle), by the hot spot pattern after the ccd detector 7 observation analyzings, the concealed wire in output beam is parallel with the polarization direction of described polaroid analyze 16 always, this moment, the light beam of output was the orientation polarized light, referring to Fig. 3 (b);
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 during unspecified angle, the 3rd knob of regulating on the described multidimensional adjustment rack 12 15 makes described ccd detector 7 can observe hollow beam clearly, finely tune second knob 14 and rotate described polaroid analyze 16 this moment, (be set at 22.5 ° of step pitches, rotate a circle), by the hot spot pattern after the ccd detector 7 observation analyzings, concealed wire in output beam is a certain angle with the polarization direction of described polaroid analyze 16 always, this moment, the light beam of output was the intermediate state light beam, referring to Fig. 3 (c).
Described orientation polarization angle θ
0Because of different optical fiber changes to some extent, θ
0～5 °
This shows that the present invention can realize the switching between radial polarisation, orientation polarization and intermediate state polarization hollow beam by second knob 14 and the 3rd knob 15 and the quarter-wave plate 3 of interlock rotation multidimensional adjustment rack 12.Use very convenient.
Claims (5)
1. the generation device of the adjustable hollow beam of polarization state, be characterised in that this device comprises LASER Light Source (1), laser outbound course along this LASER Light Source (1), be 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 anchor clamps (10) of described multidimensional adjustment rack (12), the structure of fiber_optic (11) that the input termination (8) of described optical fiber (5) is fixed on described multidimensional adjustment rack (12) goes up and the end face of this input end (8) is positioned on 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 the less fundamental mode optical fibre of the low step mode of laser wavelength of incidence, described multidimensional adjustment rack (12) also has first knob (13), second knob (14) and the 3rd knob (15) are adjusted the level and the luffing angle of described microcobjective (4) by anchor clamps (10) respectively, with the light beam after realize focusing on to optical fiber from axle incident.
2. the generation device of the adjustable hollow beam of polarization state according to claim 1 is characterized in that described optical fiber (5) is only to support two the low step mode LP01 moulds of laser wavelength of incidence and the less fundamental mode optical fibre of LP02 mould.
3. the generation device of the adjustable hollow beam of polarization state according to claim 1, it is characterized in that, also be provided with polaroid analyze (16) and ccd detector (7) on the output light path of described collimation lens (6), the imaging surface of described ccd detector (7) is positioned on the focal plane of described collimation lens (6).
4. utilize the method for the generation device generation hollow beam of the adjustable hollow beam of the described polarization state of claim 1, it is characterized in that this 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 first knob (13), second knob (14) and the 3rd knob (15) of described multidimensional adjustment rack (12), by anchor clamps (10) level and the luffing angle of described microcobjective (4) are adjusted, with the light beam after realize focusing on to optical fiber from axle incident, thereby suppress exciting of the middle LP01 mould of described optical fiber (5), realize the output of hollow beam;
The anglec of rotation of 3. rotating described quarter-wave plate (3) is to realize optionally exciting the hollow beam of radial polarisation, orientation polarization and intermediate state polarization:
Rotating described quarter-wave plate (3) makes the optical axis of this wave plate parallel with the polarization direction of the described polarizer (2), the 3rd knob of regulating on the described multidimensional adjustment rack (12) (15) makes described ccd detector (7) can observe hollow beam clearly, finely tune second knob (14) and rotate described polaroid analyze (16) this moment, by the hot spot pattern after described ccd detector (7) the observation analyzing, concealed wire in output beam is vertical with the polarization direction of described polaroid analyze (16) always, and this moment, the light beam of output was radial polarisation 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 orientation polarization angle θ
0The time, the 3rd knob of regulating on the described multidimensional adjustment rack (12) (15) makes described ccd detector (7) can observe hollow beam clearly, finely tune second knob (14) and rotate described polaroid analyze (16) this moment, by the hot spot pattern after ccd detector (7) the observation analyzing, concealed wire in output beam is parallel with the polarization direction of described polaroid analyze (16) always, and this moment, the light beam of output was the 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 during unspecified angle, the 3rd knob of regulating on the described multidimensional adjustment rack (12) (15) makes described ccd detector (7) can observe hollow beam clearly, finely tune second knob (14) and rotate described polaroid analyze (16) this moment, by the hot spot pattern after ccd detector (7) the observation analyzing, concealed wire in output beam is a certain angle with the polarization direction of described polaroid analyze (16) always, and this moment, the light beam of output was the intermediate state light beam.
5. method according to claim 4 is characterized in that described orientation polarization angle θ
0Because of different optical fiber changes to some extent, θ
0～5 °.
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Cited By (11)
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| CN102866501A (en) * | 2012-09-27 | 2013-01-09 | 哈尔滨工程大学 | Emergent light spot strength homogenizing mode-disturbing device for optical fiber |
| CN103197431A (en) * | 2013-03-29 | 2013-07-10 | 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 |
| CN104218993A (en) * | 2014-08-15 | 2014-12-17 | 无锡信欧光电科技有限公司 | Polarization-dependent loss and differential group delay controller |
| 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 |
| CN104218993B (en) * | 2014-08-15 | 2017-01-04 | 无锡信欧光电科技有限公司 | A kind of Polarization Dependent Loss and Differential Group Delay controller |
| CN107636503A (en) * | 2015-05-14 | 2018-01-26 | 相干公司 | Polarised laser emission is transmitted using hollow-core fiber |
| CN111525376A (en) * | 2020-04-30 | 2020-08-11 | 长江师范学院 | Based on TM01Vortex laser generation method for mode light conversion and vortex laser |
| CN111751340A (en) * | 2020-06-24 | 2020-10-09 | 宁波舜宇仪器有限公司 | Light 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 |
| CN114690318A (en) * | 2022-03-31 | 2022-07-01 | 华中科技大学 | Mode wave plate based on few-mode optical fiber and mode conversion method |
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| CN102866501A (en) * | 2012-09-27 | 2013-01-09 | 哈尔滨工程大学 | Emergent light spot strength homogenizing mode-disturbing device for optical fiber |
| 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 |
| CN103197431A (en) * | 2013-03-29 | 2013-07-10 | 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 |
| CN104218993B (en) * | 2014-08-15 | 2017-01-04 | 无锡信欧光电科技有限公司 | A kind of Polarization Dependent Loss and Differential Group Delay controller |
| CN104218993A (en) * | 2014-08-15 | 2014-12-17 | 无锡信欧光电科技有限公司 | Polarization-dependent loss and differential group delay controller |
| CN107636503A (en) * | 2015-05-14 | 2018-01-26 | 相干公司 | Polarised laser emission is transmitted using hollow-core fiber |
| KR102669900B1 (en) | 2015-05-14 | 2024-05-29 | 코히어런트, 인크. | Transmission of polarized laser radiation using hollow fibers |
| 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 |
| CN111525376A (en) * | 2020-04-30 | 2020-08-11 | 长江师范学院 | Based on TM01Vortex laser generation method for mode light conversion and vortex laser |
| 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 |
| CN111751340A (en) * | 2020-06-24 | 2020-10-09 | 宁波舜宇仪器有限公司 | Light beam multiplexing confocal imaging device and imaging method |
| 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 |
| CN114690318A (en) * | 2022-03-31 | 2022-07-01 | 华中科技大学 | Mode wave plate based on few-mode optical fiber and mode conversion method |
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