CN104917044A - Optical fiber type laser beam quality optimization device - Google Patents
Optical fiber type laser beam quality optimization device Download PDFInfo
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- CN104917044A CN104917044A CN201510309730.4A CN201510309730A CN104917044A CN 104917044 A CN104917044 A CN 104917044A CN 201510309730 A CN201510309730 A CN 201510309730A CN 104917044 A CN104917044 A CN 104917044A
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- optical fiber
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- light beam
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Abstract
The invention provides an optical fiber type laser beam quality optimization device, which comprises a passive optical fiber, a collimating mirror, a spectroscope, a light beam quality measuring unit and a control unit, wherein the passive optical fiber is provided with a coupling device and a plurality of optical fiber adjusters; the light beam quality measuring unit measures quality of output light beams in real time, and transmits results to the control unit; the control unit parses out control signals required by control points and transmits the signals to parameter adjusters; and the parameter adjusters controls mode coupling of modes in the optical fiber after changing parameters such as a refractive index or optical path of the optical fiber, so that energy is coupled from a high-order mode to a low-order mode, thereby realizing optimization of the light beam quality. The optical fiber type laser beam quality optimization device has the advantages of being compact in size, high in efficiency, low in output power loss, stable and reliable, capable of real-time optimization of light beam quality, and high in anti-interference capability.
Description
Technical field
The present invention relates to a kind of optical-fiber type laser beam quality optimization device, for controlling and improve beam quality and the brightness of Output of laser in real time, be adapted at the application of high power laser light field.
Background technology
Along with development in science and technology and economic growth, in industry manufacture field, more and more higher requirement is proposed to the brightness of laser system.But in high power situation, all can there is the problem that beam quality declines in all types of laser, output brightness is difficult to be guaranteed.People propose kinds of schemes to promote the beam quality of Output of laser.Such as can design the waveguiding structure of special transmission laser to filter out higher order mode.But this mode can lose a part of power, be difficult to apply in high power situation; And need the beam quality of known laser, cannot accomplish to adjust the next beam quality deterioration of environment disturbed belt in real time.Self adaptation distorting lens such as can be used again to improve the beam quality of Output of laser.But self adaptation distorting lens is expensive, and in limited volume array element Limited Number, be difficult to realize high precision light beam quality and improve.
Summary of the invention
In order to overcome above-mentioned prior art Problems existing, the invention provides a kind of optical-fiber type laser beam quality optimization device, laser coupled to be optimized is entered an optical fiber, measure the beam quality exported in real time and the refractive index of FEEDBACK CONTROL optical fiber each point or light path, change optical fiber internal schema coupling condition, realize laser to be coupled from higher order mode to low step mode, thus improve beam quality, have volume little, efficiency is high, real-time optimization, reliable and stable advantage.
The technology of the present invention solution is as follows:
A kind of optical-fiber type laser beam quality optimization device, comprises coupling unit, passive fiber, collimating mirror, spectroscope, beam quality measuring unit, control unit and optical fiber adjuster;
Laser to be optimized is coupled into passive fiber by coupling unit, transmission after outgoing, by collimating mirror, then be divided into two light beams through spectroscope, the first light beam as output light, in the second light beam incident beam quality measurement unit; Beam quality measuring unit is for measuring the quality information of the second light beam; Control circuit is used for generating control signal according to the quality information of the second light beam and sending optical fiber adjuster to; Optical fiber adjuster is installed on described passive fiber, optical fiber adjuster is used under the effect of described control signal, change optical fiber parameter to control the coupling of each pattern in optical fiber, thus energy is coupled to low-order mode from high-rder mode, complete the optimization of beam quality.
The effect that described coupling unit does not have beam quality to select in coupling process, enters described passive fiber by the laser coupled of more than 90% as far as possible.Described passive fiber can propagate all communication modes that beam quality laser to be optimized comprises.
Described spectroscopical reflectivity is from 0.01% to 99.99%.
Described beam quality measuring unit can be placed on spectroscopical transmission direction, also can be placed on spectroscopical reflection direction, described beam quality measuring unit can be but be not limited to be: charge coupled cell (CCD), beam quality measuring instrument and video camera etc.
The algorithm that described control unit realizes can be but be not limited to: random paralleling gradient descent algorithm, single dithering, many ditherings, genetic algorithm and simulated annealing etc.
Described parameter regulator multiple spot is arranged on optical fiber, can be but be not limited to: piezoelectric ceramic (PZT), semiconductor cooler (TEC), resistance wire, phase-modulator and stepping motor etc.
Collimating mirror can be convex lens, also can be convex lens group.
Technique effect of the present invention:
Can allow in the optical fiber of various mode propagation at one section, may emergence pattern coupling between various pattern.Laser coupled to be optimized in the optical fiber that multiple optical fiber adjuster is housed, is measured the beam quality exported, is flowed to control unit by the present invention in real time.Control unit can parse the control signal required for each control point, then flows to a parameter regulator.The parameters such as the refractive index of parameters adjuster change optical fiber or light path control the Mode Coupling of each pattern in optical fiber later, thus energy is coupled from high-rder mode to low-order mode, realize the optimization of beam quality.Compared with existing first technology, compact, with low cost, can real-time optimization beam quality, system stability is reliable, is applicable to various types of laser and exports, can realize the beam quality optimization of high-power laser beam, obtain high brightness laser.
Accompanying drawing explanation
Fig. 1 is optical-fiber type laser beam quality optimization device structure chart of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each execution mode of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
First refer to Fig. 1, Fig. 1 is an embodiment of optical-fiber type laser beam quality optimization device.A power output is the ytterbium-doping optical fiber laser of 1000W, and beam quality is about M
2=4.Coupling unit 1 adopts the mode of welding to be 50 μm by almost all laser coupled enters a core diameter, and cladding diameter is 400 μm, and length is the passive fiber 2 of 1m.On passive fiber 2 equally spaced set up 20 piezoelectric ceramic as can change passive fiber 2 local light path optical fiber adjuster 7.Convex lens 3 collimation being 40mm by a focal length after laser exports from passive fiber becomes a diameter and is about 6mm light beam, by the spectroscope 4 that a reflectivity is 99.9%, the light reflection of 99.9% is as exporting light, and the Transmission light of 0.1% enters the receiving surface of a high-speed CCD 5.We are multiplied by area as evaluation function using the light intensity in the circle at diameter 4mm.
In the present embodiment, control circuit unit 6 adopts stochastic parallel gradient descent method, and process is as follows:
1), an initial control voltage u is set first at random
(0)={ u
1, u
2..., u
20}
(0).Export respectively on 20 piezoelectric ceramic;
2) information, then collected by high-speed CCD 5 calculates evaluation function J fast
(m);
3), regeneration random perturbation voltage δ u
(m)={ δ u
x1, δ u
y1, δ u
x2, δ u
y2}
(m)and preserve;
4), by disturbance voltage δ u
(m)with control voltage u
(m)output on piezoelectric ceramic 7;
5) the evaluation function J after disturbance, is measured
+ (m);
6), by random perturbation voltage δ u
(m)negate and with control voltage u
(m)piezoelectric ceramic 7 is exported on after cumulative;
7) the evaluation function J after disturbance, is obtained
- (m);
8), Calculation Estimation variation of function Δ J
(m)=J
+ (m)-J
- (m);
9), according to formula u
(m+1)=u
(m)+ γ δ u
(m)Δ J
(m)upgrade control voltage and export piezoelectric ceramic 7 to, carry out the m+1 time iteration;
10), the 3rd is proceeded to) step, proceed voltage control, until system-down.
After algorithm realization convergence, the evaluation function J that CCD5 collects is stabilized in maximum.Now, beam quality reaches optimized effect, achieves M
2=1.2, power output is 998W.
This embodiment shows, the present invention has compact, with low cost, can real-time optimization beam quality, the advantages such as system stability is reliable.Be applicable to various types of laser export, the beam quality optimization of high-power laser beam can be realized, obtain high brightness laser.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. an optical-fiber type laser beam quality optimization device, it is characterized in that, comprise coupling unit (1), passive fiber (2), collimating mirror (3), spectroscope (4), beam quality measuring unit (5), control unit (6) and optical fiber adjuster (7);
Laser to be optimized is coupled into passive fiber (2) by coupling unit (1), outgoing after transmission, by collimating mirror (3), two light beams are divided into again through spectroscope (4), first light beam as output light, in the second light beam incident beam quality measurement unit (5); Beam quality measuring unit (5) is for measuring the quality information of the second light beam; Control circuit (6) generates control signal for the quality information according to the second light beam and sends optical fiber adjuster to; Optical fiber adjuster (7) is installed on described passive fiber (2), optical fiber adjuster (7) is under the effect of described control signal, change optical fiber parameter to control the coupling of each pattern in optical fiber, thus energy is coupled from high-rder mode to low-order mode, complete the optimization of beam quality.
2. according to the optical-fiber type laser beam quality optimization device described in claim 1, it is characterized in that: described beam quality measuring unit (5) is placed on spectroscopical transmission direction, or being placed on spectroscopical reflection direction, described beam quality measuring unit (5) is charge coupled cell, beam quality measuring instrument or video camera.
3. according to the optical-fiber type laser beam quality optimization device described in claim 1, it is characterized in that: described optical fiber adjuster (7) is piezoelectric ceramic, semiconductor cooler, resistance wire, phase-modulator or stepping motor.
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| CN201510309730.4A CN104917044B (en) | 2015-06-08 | 2015-06-08 | A kind of optical-fiber type laser beam quality optimizes device |
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|---|---|---|---|
| CN201510309730.4A CN104917044B (en) | 2015-06-08 | 2015-06-08 | A kind of optical-fiber type laser beam quality optimizes device |
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| CN104917044B CN104917044B (en) | 2018-04-03 |
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| CN109145411A (en) * | 2018-08-02 | 2019-01-04 | 浙江工业大学 | A kind of Key Circuit unit positioning method based on embedded parallel organization genetic algorithm |
| CN112731594A (en) * | 2021-03-31 | 2021-04-30 | 武汉光谷航天三江激光产业技术研究院有限公司 | Intelligent optical fiber coupling system and method |
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| CN103259169A (en) * | 2013-04-22 | 2013-08-21 | 西北大学 | Difference frequency terahertz wave optical optical fiber laser |
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| US20140347662A1 (en) * | 2012-05-17 | 2014-11-27 | The United States Of America As Represented By The Secretary Of Commerce | Coupled Cavity Spectrometer With Enhanced Sensitivity and Dynamic Range |
| CN102830474A (en) * | 2012-09-10 | 2012-12-19 | 太原理工大学 | Automatic coupling device from optical fiber laser device to single mode optical fiber |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109145411A (en) * | 2018-08-02 | 2019-01-04 | 浙江工业大学 | A kind of Key Circuit unit positioning method based on embedded parallel organization genetic algorithm |
| CN109145411B (en) * | 2018-08-02 | 2023-04-18 | 浙江工业大学 | Key circuit unit positioning method based on embedded parallel structure genetic algorithm |
| CN112731594A (en) * | 2021-03-31 | 2021-04-30 | 武汉光谷航天三江激光产业技术研究院有限公司 | Intelligent optical fiber coupling system and method |
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| CN104917044B (en) | 2018-04-03 |
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