CN103633540A - Optical fiber laser aligning system - Google Patents
Optical fiber laser aligning system Download PDFInfo
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- CN103633540A CN103633540A CN201310636764.5A CN201310636764A CN103633540A CN 103633540 A CN103633540 A CN 103633540A CN 201310636764 A CN201310636764 A CN 201310636764A CN 103633540 A CN103633540 A CN 103633540A
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Abstract
The invention provides an optical fiber laser aligning system which comprises an optical fiber laser, an optical fiber output terminal, an aligning lens, an aligner displacement drive component, a wave surface calibration component, a beam splitter, a light condenser, a sensing element and a control system. The laser output by the optical fiber laser outputs from the output terminal through an output optical fiber. The output laser is aligned by the aligning lens and transmitted to the wave face calibration component for calibration. The calibrated laser is transmitted to the beam splitter. Most of the laser is output by the beam splitter in a reflection manner. A small part of the laser transmits to a focusing lens and focused to the sensing element. A closed loop control component feeds back signals to control the wave surface calibration component and the aligning lens displacement drive component by processing the output signals of the sensing element.
Description
Technical field
The present invention relates to laser technology field, be specifically related to a kind of optical-fiber laser colimated light system.
Background technology
The advantages such as high-capacity optical fiber laser has that conversion efficiency is high, good beam quality, thermal control management is simple and compact conformation is flexible, make it in industry, scientific research and the field such as military, have a wide range of applications.Fiber laser in use, conventionally need to collimate fiber laser outgoing laser beam and obtain good collimated light beam, and then focuses on use.
Patent " collimater of fiber laser and fiber laser " (publication number 102135668A) discloses a kind of collimater of fiber laser, it comprises lens barrel, is fixed on the output tail optical fiber of this lens barrel front end and is fixed on the optical lens in this lens barrel, the rear end face of this output tail optical fiber is positioned at the focus place of this optical lens, and described optical lens comprises biconcave lens and the biconvex lens of the same optical axis arranging in turn along light path.Collimater of the present invention, the doublet that its optical lens is mainly comprised of the biconcave lens of positive spherical aberration and the biconvex lens of negative spherical aberration, this doublet can be eliminated system aberration, thereby the beam quality of output beam does not reduce substantially after assurance collimator and extender, maintained the high advantage of fiber laser beam quality.
In existing laser fiber collimater, conventionally adopt the method for collimating lens and fiber end face gummed, the GRIN Lens of making, non-spherical lens, spherical lens or set of lenses are bonded on fiber end face.In order to improve collimater performance, people have carried out a large amount of research work.For example Chinese patent " optical fiber collimator " (02112329.2) has proposed a kind of collimator structure that adds connector, by by connector respectively with optical fiber and the bonding mode of collimating lens, avoided adhesive to enter light path.But it can not solve, debug error, detect with the introducing of making nonsynchronous problem, while connector and caused between optical fiber and collimating lens and had air gap, when light beam by time can produce echo reflection and off-energy.The problem of existing collimater is: collimating lens and optical fiber exist debugs error, and collimation effect monitoring and collimater are made asynchronous.
In a word, there is following problem in the collimation output for high-capacity optical fiber laser: first, there is certain regulating error in collimating lens, comprise axial adjustment error and longitudinal regulating error, axial adjustment error will cause collimating out of focus cannot obtain collimated light beam, longitudinally regulating error will cause launching light beam off-axis to; Second, during high-capacity optical fiber laser collimation, collimating lens is worked and is produced large calorimetric under laser high power density, cause thermal lensing effect, in the inside of lens, changed the refractive index of collimating lens, on the surface of lens, caused distortion, thereby collimating lens focal length is changed, cause collimating error to occur, impact collimation effect; The 3rd, high power optical fibre laser is in alignment procedure, and the effects such as lens spherical aberration change the corrugated of laser, impact collimation effect.The 4th, the good beam quality of gain fibre laser, but due under high power, fiber laser can excite high-rder mode, causes beam quality variation.In a word, the decline of collimation effect, finally causes the beam quality of Output of laser to decline, and affects the effective utilization of fiber laser.
Summary of the invention
(1) technical problem solving
For the deficiencies in the prior art, the invention provides a kind of optical-fiber laser colimated light system, can realize the high accuracy collimation to fiber laser Output of laser, significantly improve the quality of high power optical fibre laser output.
(2) technical scheme
In order to realize above object, the present invention is achieved by the following technical programs:
A kind of optical-fiber laser colimated light system, it is characterized in that, comprise fiber laser, output optical fibre, fiber-optic output head, collimating lens, collimating lens displacement drive assembly, Wavefront Rectification assembly, light-splitting device, condenser, sensing element and closed-loop control assembly.
Wherein, described fiber laser Emission Lasers, described laser is exported from described fiber-optic output head through described output optical fibre, the laser of output is transmitted on described Wavefront Rectification assembly after described collimating lens collimation, the laser of described Wavefront Rectification assembly after to described collimation is proofreaied and correct, and by the Laser output after proofreading and correct to described light-splitting device, described light-splitting device is exported most of laser reflection, by small part laser-transmitting to described condenser, described condenser converges to the laser of transmission on described sensing element, after described sensing element carries out opto-electronic conversion, output electrical signals is to described closed-loop control assembly, described closed-loop control assembly generates feedback signal according to the described signal of telecommunication, and utilize Wavefront Rectification assembly and described collimating lens displacement drive assembly described in feedback signal closed-loop control.
Wherein, utilize Wavefront Rectification assembly described in feedback signal closed-loop control specifically to comprise: by closed-loop control assembly, to obtain feedback signal the corrugated of laser is detected and proofreaied and correct.
Wherein, utilize collimating lens displacement drive assembly described in feedback signal closed-loop control specifically to comprise: by closed-loop control assembly, to obtain feedback signal the position of described collimating lens is detected and proofreaied and correct.
Wherein, the Control loop of described collimating lens displacement drive assembly is comprised of collimating lens displacement drive assembly, collimating lens, sensing element and closed-loop control assembly.
Wherein, the Control loop of described Wavefront Rectification assembly is comprised of Wavefront Rectification assembly, light-splitting device, condenser, sensing element and closed-loop control assembly.
Wherein, the sensing element in the Control loop of described collimating lens displacement drive assembly and the Control loop of described Wavefront Rectification assembly and closed-loop control assembly are all devices.
Additionally, the sensing element in the Control loop of described collimating lens displacement drive assembly and the Control loop of described Wavefront Rectification assembly is two devices, and closed-loop control assembly is two assemblies.
(3) beneficial effect
The present invention at least has following beneficial effect:
The optical-fiber laser colimated light system that the present invention proposes, feature is to comprise two Control loops, and closed-loop control assembly utilizes feedback signal, and collimation lens displacement driven unit and Wavefront Rectification assembly are controlled respectively.Adopt collimator lens position closed-loop control, compensation collimating lens is because of collimating error and the thermal lensing effect of position deviation; Adopt corrugated closed-loop control, the thermic aberration that correction high power collimation causes and the wavefront distortion of high power optical fibre laser transmission etc., the high accuracy collimation of realizing high power optical fibre laser, significantly improves high power optical fibre laser output beam quality, finally significantly promotes fiber laser task performance.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these figure other accompanying drawing.
Accompanying drawing 1 is the structure chart of a kind of optical-fiber laser colimated light system in the present invention;
Accompanying drawing 2 is embodiment that the present invention is applied to one-level optical fiber laser amplifier;
Accompanying drawing 3 is embodiment that the present invention is applied to two-stage optical fiber laser amplifier;
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Referring to Fig. 1, the embodiment of the present invention provides a kind of optical-fiber laser colimated light system, comprises following components: fiber laser 101, output optical fibre 102, fiber-optic output head 103, collimating lens 105, Wavefront Rectification assembly 107, light-splitting device 108, condenser 109, sensing element 110, control system 114 and collimating lens displacement drive assembly 112.
Wherein, fiber laser 101 Emission Lasers, described laser is exported from fiber-optic output head 103 through output optical fibre 102, the laser of output is transmitted on Wavefront Rectification assembly 107 after described collimating lens 105 collimations, laser after Wavefront Rectification assembly 107 collimation is proofreaied and correct, and by the Laser emission after proofreading and correct to light-splitting device 108, light-splitting device 108 is exported most of laser reflection, by small part laser-transmitting to condenser 109, condenser 109 converges to the laser of transmission on sensing element 110, sensing element 110 carries out opto-electronic conversion output electrical signals to closed-loop control assembly 114, closed-loop control assembly 114 generates feedback signal according to the signal of telecommunication obtaining, and utilize feedback signal closed-loop control Wavefront Rectification assembly 107 and collimating lens displacement drive assembly 112.
Wherein, the sensing element 110 in the Control loop of the Control loop of collimating lens displacement drive assembly and Wavefront Rectification assembly and closed-loop control assembly 114 are all devices.
Wherein, adopt collimator lens position closed-loop control, the position of collimation lens is detected and is proofreaied and correct, and compensation collimating lens is because of collimating error and the thermal lensing effect of position deviation; Adopt corrugated closed-loop control, the corrugated of laser is detected and proofreaied and correct, the thermic aberration that correction high power collimation causes and the wavefront distortion of high power optical fibre laser transmission etc., to realize the high accuracy collimation of high power optical fibre laser, significantly improve high power optical fibre laser output beam quality.
Referring to Fig. 2, the embodiment of the present invention provides a kind of one-level optical fiber laser amplifier of applying above-mentioned optical-fiber laser colimated light system.Wherein, fiber laser is by optical fiber seed source 215, and one-level fiber amplifier 216 and Wavefront Rectification unit form.Optical fiber seed source 215 is by semiconductor laser pumping source, single mode gain fibre, and fiber grating and pumped fiber coupler form, and the gain fibre fibre core/cladding diameter adopting is 10/125um, and fibre core numerical aperture is 0.06, and optical fiber seed source is realized basic mode output.Fiber amplifier level is by pumping source, and large mould field gain fibre and pumping coupling form, and the gain fibre fibre core/cladding diameter of employing is 30/250um, and fibre core numerical aperture is 0.06.Monomode fiber seed source is excited multi-mode laser and is amplified by fiber amplifier level.
After the laser of optical fiber seed source 215 outputs amplifies by optical-fiber laser amplifying stage 216, from fiber-optic output 203 outputs; Output of laser is transmitted on Wavefront Rectification assembly 207 after collimating lens 205 collimations, and after Wavefront Rectification assembly Wavefront Rectification, most of light is by light-splitting device 208 reflection outputs.Light-splitting device 208 converges to part laser-transmitting on sensing element 210 after focus lamp 209 simultaneously.Control system 214, closed-loop control system 211 is by the processing to sensing element 210 output signals, feedback signal closed-loop control Wavefront Rectification assembly 207 and collimating lens displacement drive assembly 212, the Wavefront Rectification of realization to fiber laser Output of laser, finally realizes the output of high light beam quality high power optical fibre laser.Due to the mode that adopts the main oscillations of monomode fiber laser to amplify, the multi-mode laser that amplifying stage obtains is exported phase place between each pattern and is correlated with, so, with Wavefront Rectification assembly, carry out Wavefront Rectification and can improve quality for outputting laser beam.
Referring to Fig. 3, the embodiment of the present invention provides a kind of two-stage optical fiber laser amplifier of applying above-mentioned optical-fiber laser colimated light system.Wherein, fiber laser is by optical fiber seed source 315, and one-level fiber amplifier 316 and Wavefront Rectification unit form.Optical fiber seed source 315 is by semiconductor laser pumping source, single mode gain fibre, and fiber grating and pumped fiber coupler form, and the gain fibre fibre core/cladding diameter adopting is 10/125um, and fibre core numerical aperture is 0.06, and optical fiber seed source is realized basic mode output.The first fiber amplifier level 316-1 is by pumping source, and large mould field gain fibre and pumping coupling form, and the gain fibre fibre core/cladding diameter of employing is 20/400um, and fibre core numerical aperture is 0.06.The second fiber amplifier level 316-2 is by pumping source, and large mould field gain fibre and pumping coupling form, and the gain fibre fibre core/cladding diameter of employing is 30/400um, and fibre core numerical aperture is 0.06.Monomode fiber seed source is excited multi-mode laser and is amplified by two-stage fiber amplifier level.
After the laser of optical fiber seed source 315 outputs amplifies by two-stage optical-fiber laser amplifying stage, from fiber-optic output 303 outputs; Output of laser is transmitted on Wavefront Rectification assembly 307 after collimating lens 305 collimations, and after Wavefront Rectification assembly Wavefront Rectification, most of light is by light-splitting device 308 reflection outputs.Light-splitting device 308 converges to part laser-transmitting on sensing element 310 after focus lamp 309 simultaneously.Control system 314, closed-loop control system 311 is by the processing to sensing element 310 output signals, feedback signal closed-loop control Wavefront Rectification assembly 307 and collimating lens displacement drive assembly 312, the Wavefront Rectification of realization to fiber laser Output of laser, finally realizes the output of high light beam quality high power optical fibre laser.Due to the mode that adopts the main oscillations of monomode fiber laser to amplify, the multi-mode laser that amplifying stage obtains is exported phase place between each pattern and is correlated with, so, with Wavefront Rectification assembly, carry out Wavefront Rectification and can improve quality for outputting laser beam.
Above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (7)
1. an optical-fiber laser colimated light system, it is characterized in that, comprise fiber laser, output optical fibre, fiber-optic output head, collimating lens, collimating lens displacement drive assembly, Wavefront Rectification assembly, light-splitting device, condenser, sensing element and closed-loop control assembly;
Wherein, described fiber laser Emission Lasers, described laser is exported from described fiber-optic output head through described output optical fibre, the laser of output is transmitted on described Wavefront Rectification assembly after described collimating lens collimation, the laser of described Wavefront Rectification assembly after to described collimation is proofreaied and correct, and by the Laser output after proofreading and correct to described light-splitting device, described light-splitting device is exported most of laser reflection, by small part laser-transmitting to described condenser, described condenser converges to the laser of transmission on described sensing element, after described sensing element carries out opto-electronic conversion, output electrical signals is to described closed-loop control assembly, described closed-loop control assembly generates feedback signal according to the described signal of telecommunication, and utilize Wavefront Rectification assembly and described collimating lens displacement drive assembly described in feedback signal closed-loop control.
2. the system as claimed in claim 1, is characterized in that, utilizes Wavefront Rectification assembly described in feedback signal closed-loop control specifically to comprise: by closed-loop control assembly, to obtain feedback signal the corrugated of laser is detected and proofreaied and correct.
3. the system as claimed in claim 1, is characterized in that, utilizes collimating lens displacement drive assembly described in feedback signal closed-loop control specifically to comprise: by closed-loop control assembly, to obtain feedback signal the position of described collimating lens is detected and proofreaied and correct.
4. the system as claimed in claim 1, is characterized in that, the Control loop of described collimating lens displacement drive assembly is comprised of collimating lens displacement drive assembly, collimating lens, sensing element and closed-loop control assembly.
5. system as claimed in claim 4, is characterized in that, the Control loop of described Wavefront Rectification assembly is comprised of Wavefront Rectification assembly, light-splitting device, condenser, sensing element and closed-loop control assembly.
6. system as claimed in claim 5, is characterized in that, the sensing element in the Control loop of described collimating lens displacement drive assembly and the Control loop of described Wavefront Rectification assembly and closed-loop control assembly are all devices.
7. system as claimed in claim 5, is characterized in that, the sensing element in the Control loop of described collimating lens displacement drive assembly and the Control loop of described Wavefront Rectification assembly is two devices, and closed-loop control assembly is two assemblies.
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| CN201310636764.5A CN103633540B (en) | 2013-11-27 | 2013-11-27 | A kind of optical-fiber laser colimated light system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105406334A (en) * | 2015-12-29 | 2016-03-16 | 中国科学院西安光学精密机械研究所 | Spatial beam coupling system and closed-loop control method thereof |
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| US20070176077A1 (en) * | 2006-01-30 | 2007-08-02 | Science Applications International Corporation | System and method for correction of turbulence effects on laser or other transmission |
| CN102081200A (en) * | 2010-12-20 | 2011-06-01 | 长春理工大学 | Adaptive optical fiber coupling and output collimation device for variable light beam quality laser |
| CN102508365A (en) * | 2011-11-01 | 2012-06-20 | 浙江大学 | Method and apparatus of real-time automatic calibration and compensation for beam drift |
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Patent Citations (5)
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| JP2007151244A (en) * | 2005-11-24 | 2007-06-14 | Nippon Signal Co Ltd:The | Synchronous timing detector of electromagnetic actuator |
| US20070176077A1 (en) * | 2006-01-30 | 2007-08-02 | Science Applications International Corporation | System and method for correction of turbulence effects on laser or other transmission |
| CN1987546A (en) * | 2006-12-30 | 2007-06-27 | 中国科学院光电技术研究所 | Device for realizing light beam automatic shaping using shape changing lens |
| CN102081200A (en) * | 2010-12-20 | 2011-06-01 | 长春理工大学 | Adaptive optical fiber coupling and output collimation device for variable light beam quality laser |
| CN102508365A (en) * | 2011-11-01 | 2012-06-20 | 浙江大学 | Method and apparatus of real-time automatic calibration and compensation for beam drift |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105406334A (en) * | 2015-12-29 | 2016-03-16 | 中国科学院西安光学精密机械研究所 | Spatial beam coupling system and closed-loop control method thereof |
| CN105406334B (en) * | 2015-12-29 | 2018-07-27 | 中国科学院西安光学精密机械研究所 | Spatial beam coupled system and its closed loop control method |
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Effective date of registration: 20180504 Address after: 102200 building 32, Zhongyuan Yun Yuan Garden, 79 baton West Road, Changping District, Beijing. Patentee after: Beijing Tongfang Huaguang System Technology Co., Ltd. Address before: 100084 Tsinghua Yuan, Beijing, Tsinghua Yuan, Beijing 100084-82 mailbox Patentee before: Tsinghua University |