CN103001106A - High power optical fiber laser amplifier capable of achieving stable control of polarization precompensation - Google Patents
High power optical fiber laser amplifier capable of achieving stable control of polarization precompensation Download PDFInfo
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Abstract
The invention discloses a high power optical fiber laser amplifier capable of achieving stable control of polarization precompensation. The high power optical fiber laser amplifier comprises a polarization controller, an optical fiber amplifier, a polarization detector and an analysis controller, the seed beam output direction sequentially passes through the polarization controller, the optical fiber amplifier and the polarization detector, strong light output by an output end of the polarization detector is used as an amplified high-power laser, and weak light output by the other output end of the polarization detector is output to the analysis controller to perform feedback control to the polarization controller. According to the high power optical fiber laser amplifier, polarization changes of output light are detected, the electric optical fiber polarization controller is used to perform feedback compensation to polarization disturbance, high power laser output with stable polarization can be achieved, expensive polarization-maintaining type optical fibers are not used so that costs are reduced, and the high power optical fiber laser amplifier can be conveniently popularized to a large mode field photonic crystal fiber or a double-cladding gain optical fiber.
Description
Technical field
The present invention relates to the high power optical fibre laser amplifier of the stable control of a kind of polarization precompensation, belong to the laser control technique field.
Background technology
Fiber laser has the advantages such as volume is little, lightweight, conversion efficiency is high, output beam quality is good, has obtained in recent years swift and violent development.High-capacity optical fiber laser, especially ultrashort pulse fiber laser adopt low-power seed source and multi-stage power amplifier to form, i.e. MOPA(Master Oscillator Power Amplifier usually).Photonic crystal fiber or the double clad gain fibre of the symmetry that main amplifying stage adopts usually, but there are the environmental interference such as a large amount of vibrations, variations in temperature in the environment of fiber amplifier work, optical fiber in the amplifier is subject to the interference of these changing factors in the surrounding environment easily, causes exporting the polarisation of light attitude and shakes.Amplify a series of important application such as non-linear video stretching in relevant synthetic, the coherent detection, nonlinear frequency conversion, optical parameter amplification, spectral combination, photonic crystal fiber of light beam, laser spectroscopy, all the polarizability of high-capacity optical fiber laser had very high requirement.Be head it off, scheme in the past adopts inclined to one side photonic crystal fiber or the double clad gain fibre of guarantor to keep the stable output of polarization more, but protect inclined to one side large mode area pcf and double clad gain fibre and make difficulty, expensive, use also inconvenient, other devices in the laser amplifier system light path all will correspondingly adopt polarization-type, and cost further increases, moreover large mould field polarization maintaining optical fibre optical component manufacture craft is also relatively immature.These effects limit applying of this method.
Summary of the invention
For addressing the above problem, the invention provides the high power optical fibre laser amplifier of the stable control of a kind of polarization precompensation, utilize electronic optical fiber polarization controller to come the disturbance of feedback compensation polarization by surveying the variation of output polarisation of light, not only can realize the high power laser light output that polarization is stable, and do not use expensive guarantor's bias tyre optical fiber, reduce cost, can be generalized to easily large mode area pcf or double clad gain fibre.
For achieving the above object, the present invention adopts following technical scheme:
The high power optical fibre laser amplifier of the stable control of polarization precompensation comprises Polarization Controller, fiber amplifier, polarization detector, analyzer-controller; The seed light outbound course is described Polarization Controller, fiber amplifier, polarization detector successively, using as the high power laser light after amplifying than high light of an output output of polarization detector, what another output of polarization detector was exported is defeated by analyzer-controller FEEDBACK CONTROL Polarization Controller than the low light level.
Described Polarization Controller comprises optical fiber squeezer and controlled fiber of 3 angled arrangements, and controlled fiber is monomode fiber, multimode fiber, touches area double-cladding optical fiber or high-strength light photonic crystal fiber greatly, and three optical fiber squeezers axially are 45 degree.
Described fiber amplifier comprises high-power fiber optic isolator, multiple die semiconductor laser, pump combiner, yb-doped double-clad fiber, fiber collimating lenses; The seed light of Polarization Controller output enters pump combiner by high-power fiber optic isolator, the multiple die semiconductor laser connects the pumping input of pump combiner, the common port of pump combiner connects yb-doped double-clad fiber, and the output light of yb-doped double-clad fiber is exported to described polarization detector after collimating by fiber collimating lenses.
Described fiber amplifier comprises high-power fiber optic isolator, multiple die semiconductor laser, pump combiner, yb-doped double-clad fiber, fiber collimating lenses; The seed light of described Polarization Controller output enters yb-doped double-clad fiber by high-power fiber optic isolator, the terminal common port that connects pump combiner of yb-doped double-clad fiber, the multiple die semiconductor laser connects the pumping input of pump combiner, and the output light of pump combiner output is exported to described polarization detector after collimating by fiber collimating lenses.
Described polarization detector comprises wave plate, polarization beam apparatus, photodetector, the high power laser light of fiber amplifier output is adjusted polarization state by wave plate, then laser is divided into two strong and weak different bundles through polarization beam apparatus, a-road-through enters photodetector to be surveyed, and signal by analysis controller processes to control Polarization Controller.
Described yb-doped double-clad fiber is the monomode fiber of one or more doping in the doped with rare-earth elements, large core diameter multimode fiber, doubly clad optical fiber, photonic crystal fiber.
Described polarization beam apparatus is for being optical fiber structure or space structure.
Described seed light is continuous laser or nanosecond, psec or femtosecond pulse.
Described optical fiber laser amplifier is that multi-stage cascade amplifies, and every grade includes Polarization Controller, fiber amplifier, polarization detector and analyzer-controller.
Compared with prior art, the present invention has the following advantages:
1, by automatically controlled Polarization Controller can real time high-speed polarization scrambling is compensated, relative low price, be fit to be applied to conventional optical fiber laser amplifier, for the stable output of the polarization of FEEDBACK CONTROL high-capacity optical fiber laser provides a kind of new technology approach.
2, the present invention adopts FEEDBACK CONTROL to make the light intensity energy stabilization that detects the road at a less initial value, and control is simple, and is easy and simple to handle.
3, the Polarization Controller of the present invention's employing has the fast advantage of corresponding speed, can compensate fast polarization shake.
4, the Polarization Controller of the present invention's employing has the little advantage of insertion loss, can directly insert between optical fiber oscillator stage and the amplifier, also can be inserted between pre-amplifying stage and the power-amplifier stage.
5, the Polarization Controller of the present invention's employing is applicable to all optical regions, can be used for the FEEDBACK CONTROL of doped with rare-earth elements (ytterbium, erbium, thulium, holmium, praseodymium etc.) fiber amplifier polarization.
6, the monomode fiber that adopts in the Polarization Controller that the present invention adopts has specific high mechanical properties, enough bear the stress of piezoelectric ceramic extruding optical fiber, high strength monomode fiber wherein is available special high-intensity large core diameter multimode fiber or doubly clad optical fiber or photonic crystal fiber also, thereby is applicable to the polarization control of high-power fiber amplifying stage.
7, the polarization detector of the present invention's employing can use between a plurality of optical fiber cascade amplifiers in cascade, improves the precision of polarization control.
8, the polarization detector of the present invention's employing is applicable to continuously or the optical-fiber laser of pulse, only needs polarization detector work correspondingly under continuous or pulse mode.
9, the polarization detector of the present invention's employing, can be advantageously used in optimizing the optical frequency-doubling output of fiber amplifier, described polarization detector can with accordingly to the optical frequency-doubling device replacement of input polarization sensitivity, be controlled the polarization shake of fiber amplifier to maximum power output by the monitoring optical frequency-doubling.
10, the polarization detector of the present invention's employing, can be advantageously used in the pulse compression of high power psec and femtosecond pulse optical-fiber laser, described polarization detector can with accordingly to the optical pulse compressor reducer replacement of input polarization sensitivity, be controlled the polarization shake of fiber amplifier to the maximum compression pulse power output of acquisition by monitoring optical pulse compressor reducer.
11, the polarization detector of the present invention's employing, can expand easily and be applied to the femtosecond laser frequency comb control technology, polarization variations by the precompensation optical fiber amplifier, in conjunction with the light field T/F accurate control technique of optical fiber femtosecond laser, promote the time and frequency zone control precision of high power femtosecond optical-fiber laser.
Description of drawings
Fig. 1 is the high power optical fibre laser amplifier architecture figure of the stable control of polarization precompensation.
Fig. 2 is the schematic diagram of optical fiber polarization controller.
Fig. 3 is a kind of structure chart of the stable control of polarization precompensation high power optical fibre laser amplifier of Pumped.
Fig. 4 is a kind of structure chart of the stable control of polarization precompensation high power optical fibre laser amplifier of backward pumping.
Fig. 5 is a kind of structure chart of the stable control of polarization precompensation high power optical fibre laser amplifier of multi-stage cascade.
Fig. 6 is the workflow diagram of analyzer-controller.
Embodiment
The present invention is described in further detail by embodiment below in conjunction with accompanying drawing, so that more clearly understand the present invention:
Such as Fig. 1, the present invention introduces the high power optical fibre laser amplifier of the stable control of a kind of polarization precompensation, mainly comprises four parts, is respectively Polarization Controller 100, fiber amplifier 200, polarization detector 300, analyzer-controller 400.The weak seed light of light intensity enters fiber amplifier 200 by Polarization Controller 100 is laggard, laser after fiber amplifier 200 amplifies is by polarization detector 300 outputs, after the information exchange that polarization detector 300 obtains is crossed analyzer-controller 400 processing, FEEDBACK CONTROL Polarization Controller 100.
Optical fiber laser amplifier polarization of the present invention is stable, not only can be used for the detection of biomolecule, can also be used for the sensitive photoelectron detection etc. that laser coherence closes bundle, biomedical imaging, surface topography imaging, trace analysis, interface detection, high accuracy time domain-frequency domain control, laser radar, high accuracy pulse laser machining, aerospace field, be with a wide range of applications.
The optical fiber squeezer that described Polarization Controller 100 adopts piezoelectric ceramic to make, optical fiber squeezer can change the birefringence parameter of optical fiber dynamically, the polarization state of compensation laser.Optical fiber squeezer not only can be realized at a high speed, efficiently polarization scrambling compensation, obtain the stable high power laser light output of polarization, expand the application of high power optical fibre laser, can also avoid using polarization maintaining optical fibre and protect inclined to one side device, reduce the cost of amplification system.
Such as Fig. 2, described Polarization Controller 100 comprises the optical fiber squeezer 101 of 3 angled arrangements, 102,103 and controlled fibers 104, and controlled fiber 104 can be monomode fiber, multimode fiber, touch area double-cladding optical fiber or high-strength light photonic crystal fiber greatly.Optical fiber squeezer is made by piezoelectric ceramic, can push optical fiber and produce extra birefringence, changes the wherein polarization state of laser.Three optical fiber squeezers 101,102,103 axially are 45 degree, the extruding of different angles can cause that polarization state certain diameter on the Poincare sphere equatorial plane is the main shaft rotation, and three degree of freedom can guarantee that the polarization state of laser is compensated go back to the precalculated position effectively like this.
Embodiment 1:
Such as Fig. 3, it is the stable high power laser light amplifier of forward pumping polarization.The Polarization Controller 100 that comprises the tail optical fiber input and output, fiber amplifier, polarization detector, analyzer-controller 400.Fiber amplifier comprises high-power fiber optic isolator 201, multiple die semiconductor laser 202, pump combiner 203, yb-doped double-clad fiber 204, fiber collimating lenses 205.The power output of multiple die semiconductor laser 202 is preferably 10W, and operation wavelength is preferably 976nm.Pump combiner 203 is (1+1) * 1 structure.The preferred 1m of yb-doped double-clad fiber 204 length.Described polarization detector comprises wave plate 301, polarization beam apparatus 302, photodetector 303.Described wave plate 301 preferred quarter wave plates, its operation wavelength is preferably 1064nm.Polarization beam apparatus 302 adopts polarizing beam splitter mirror.
The seed light of Polarization Controller 100 outputs enters pump combiner by high-power fiber optic isolator 201, multiple die semiconductor laser 202 connects the pumping input of pump combiner 203, the common port of pump combiner 203 connects yb-doped double-clad fiber 204, the output light of yb-doped double-clad fiber 204 is by the rear output of fiber collimating lenses 205 collimations, then regulate polarization angle by wave plate 301 and be injected on the polarization beam apparatus 302, so that the light intensity of polarization beam apparatus 302 parallel outputs is maximum.The weak light in another road of polarizing beam splitter mirror output is injected photodetector 303 and is carried out the light intensity detection, analyzer-controller 400 receives the piezoelectric ceramic of the signal post-processing FEEDBACK CONTROL Polarization Controller of photodetector 303, so that the stabilized intensity that obtains that photodetector 303 is surveyed, so just can guarantee that laser obtains the stable output of polarization at certain initial value.
Embodiment 2:
Such as Fig. 4, it is the stable high power laser light amplifier of backward pumping polarization.The Polarization Controller 100 that comprises the tail optical fiber input and output, fiber amplifier, polarization detector, analyzer-controller 400.Fiber amplifier comprises high-power fiber optic isolator 201, multiple die semiconductor laser 202, pump combiner 203, yb-doped double-clad fiber 204, fiber collimating lenses 205.The power output of multiple die semiconductor laser 202 is preferably 10W, and operation wavelength is preferably 976nm.Pump combiner 203 is (1+1) * 1 structure.The preferred 1m of yb-doped double-clad fiber 204 length.Described polarization detector comprises wave plate 301, polarization beam apparatus 302, photodetector 303.Described wave plate 301 preferred quarter wave plates, the quarter wave plate operation wavelength is preferably 1064nm.Polarization beam apparatus 302 adopts polarizing beam splitter mirror.
The seed light of Polarization Controller 100 outputs enters yb-doped double-clad fiber 204 by high-power fiber optic isolator 201, the yb-doped double-clad fiber 204 terminal common ports that connect pump combiner 203, multiple die semiconductor laser 202 connects the pumping input of pump combiner 203, the output light of pump combiner 203 outputs is by the rear output of fiber collimating lenses 205 collimations, then regulate polarization angle by quarter wave plate and be injected on the polarization beam apparatus 302, so that the light intensity of polarization beam apparatus 302 parallel outputs is maximum.The weak light in another road of polarization beam apparatus 302 outputs is injected photodetector 303 and is carried out the light intensity detection, analyzer-controller 400 receives the piezoelectric ceramic of the signal post-processing FEEDBACK CONTROL Polarization Controller of photodetector 303, so that the stabilized intensity that obtains that photodetector 303 is surveyed, so just can guarantee that laser obtains the stable output of polarization at certain initial value.
Embodiment 3:
Such as Fig. 5, it is the high power laser light amplifier of multi-stage cascade.Comprise multistage amplification module, the structure of all grades amplification module is identical.
Every grade of amplification module all comprises Polarization Controller 100, high-power fiber optic isolator 201, multiple die semiconductor laser 202, pump combiner 203, yb-doped double-clad fiber 204, fiber collimating lenses 205, wave plate 301, polarization beam apparatus 302, photodetector 303, analyzer-controller 400.
The weak seed light of light intensity is exported through the Polarization Controller 201 of first order amplification module, enter pump combiner 203 by high-power fiber optic isolator 201, multiple die semiconductor laser 202 connects the pumping input of pump combiner 203, the common port of pump combiner 203 connects yb-doped double-clad fiber 204, the output light of yb-doped double-clad fiber 204 is by polarization beam apparatus 302 beam splitting, and the weak light in another road of polarization beam apparatus 302 outputs is injected photodetector 303 and carried out the light intensity detection.The stronger light in another road of polarization beam apparatus output carries out the next stage cascade and amplifies, enter pump combiner by high-power fiber optic isolator, the multiple die semiconductor laser connects the pumping input of pump combiner, the common port of pump combiner connects the long yb-doped double-clad fiber of 1m, the output light of yb-doped double-clad fiber is by the fibre optic polarizing beam splitter beam splitting, the weak output light of polarization beam apparatus is injected photodetector and is carried out the light intensity detection, exports more by force light and uses as the high power laser light after amplifying.Analyzer-controller is processed the piezoelectric ceramic of FEEDBACK CONTROL Polarization Controller, so that the stabilized intensity that obtains that photodetector is surveyed, so just can guarantee that laser obtains the stable output of polarization at certain initial value.
Such as Fig. 6, it is the workflow diagram of analyzer-controller, photodetector survey to be implemented the light intensity of detecting polarization beam splitter output, and the initial light intensity during recording start, when shake occurs polarization state, the light intensity of each road output of polarization beam apparatus will be not equal to initial light intensity, strengthen the voltage of Polarization Control unit this moment, if output intensity reduce with difference initial value, then keeps the voltage-regulation direction to continue to adjust, if output intensity and initial value difference increase, change so the voltage-regulation direction.By the Real Time Monitoring to output intensity, polarization state can be stablized like this.
Claims (9)
1. the high power optical fibre laser amplifier of the stable control of polarization precompensation is characterized in that: comprise Polarization Controller (100), fiber amplifier (200), polarization detector (300), analyzer-controller (400); The seed light outbound course is described Polarization Controller (100), fiber amplifier (200), polarization detector (300) successively, using as the high power laser light after amplifying than high light of an output output of polarization detector (300), what another output of polarization detector (300) was exported is defeated by analyzer-controller (400) FEEDBACK CONTROL Polarization Controller (100) than the low light level.
2. polarization precompensation according to claim 1 is stablized the high power optical fibre laser amplifier of control, it is characterized in that: described Polarization Controller (100) comprises optical fiber squeezer (101,102,103) and a controlled fiber (104) of 3 angled arrangements, controlled fiber (104) is monomode fiber, multimode fiber, touches area double-cladding optical fiber or high-strength light photonic crystal fiber greatly, and three optical fiber squeezers (101,102,103) axial 45 are spent.
3. a kind of polarization precompensation according to claim 2 is stablized the high power optical fibre laser amplifier of control, it is characterized in that: described fiber amplifier comprises high-power fiber optic isolator, multiple die semiconductor laser, pump combiner, yb-doped double-clad fiber, fiber collimating lenses; The seed light of Polarization Controller output enters pump combiner by high-power fiber optic isolator, the multiple die semiconductor laser connects the pumping input of pump combiner, the common port of pump combiner connects yb-doped double-clad fiber, and the output light of yb-doped double-clad fiber is exported to described polarization detector after collimating by fiber collimating lenses.
4. a kind of polarization precompensation according to claim 2 is stablized the high power optical fibre laser amplifier of control, it is characterized in that: described fiber amplifier comprises high-power fiber optic isolator, multiple die semiconductor laser, pump combiner, yb-doped double-clad fiber, fiber collimating lenses; The seed light of described Polarization Controller output enters yb-doped double-clad fiber by high-power fiber optic isolator, the terminal common port that connects pump combiner of yb-doped double-clad fiber, the multiple die semiconductor laser connects the pumping input of pump combiner, and the output light of pump combiner output is exported to described polarization detector after collimating by fiber collimating lenses.
5. according to claim 3 or the high power optical fibre laser amplifier of the stable control of 4 described a kind of polarization precompensations, it is characterized in that: described polarization detector comprises wave plate, polarization beam apparatus, photodetector, the high power laser light of fiber amplifier output is adjusted polarization state by wave plate, then laser is divided into two strong and weak different bundles through polarization beam apparatus, a-road-through enters photodetector to be surveyed, and signal by analysis controller processes to control Polarization Controller.
6. a kind of polarization precompensation according to claim 5 is stablized the high power optical fibre laser amplifier of control, it is characterized in that: described yb-doped double-clad fiber is the monomode fiber of one or more doping in the doped with rare-earth elements, large core diameter multimode fiber, doubly clad optical fiber, photonic crystal fiber.
7. a kind of polarization precompensation according to claim 5 is stablized the high power optical fibre laser amplifier of control, and it is characterized in that: described polarization beam apparatus is for being optical fiber structure or space structure.
8. a kind of polarization precompensation according to claim 1 is stablized the high power optical fibre laser amplifier of control, and it is characterized in that: described seed light is continuous laser or nanosecond, psec or femtosecond pulse.
9. a kind of polarization precompensation according to claim 1 is stablized the high power optical fibre laser amplifier of control, it is characterized in that: described optical fiber laser amplifier is that multi-stage cascade amplifies, and every grade includes Polarization Controller, fiber amplifier, polarization detector and analyzer-controller.
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| CN103227406A (en) * | 2013-04-28 | 2013-07-31 | 陈国梁 | Passive mode-locking optical fiber laser device |
| CN103368054A (en) * | 2013-07-26 | 2013-10-23 | 上海朗研光电科技有限公司 | Fast feedback control method and system for locked-mode self-starting of optical fiber laser |
| CN103715591A (en) * | 2014-01-07 | 2014-04-09 | 北京大学 | Optical fiber laser device based on spectrum adjustment and implementation method of optical fiber laser device |
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| CN103227406A (en) * | 2013-04-28 | 2013-07-31 | 陈国梁 | Passive mode-locking optical fiber laser device |
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| CN108767637A (en) * | 2018-08-03 | 2018-11-06 | 光越科技(深圳)有限公司 | THz high repetition frequency high power femto second optical fiber lasers based on dispersive wave |
| CN108767637B (en) * | 2018-08-03 | 2023-12-05 | 光越科技(深圳)有限公司 | THz high repetition frequency high power femtosecond optical fiber laser based on scattered wave |
| CN110233417A (en) * | 2019-05-28 | 2019-09-13 | 中国科学院理化技术研究所 | A kind of device improving diamond raman laser efficiency |
| CN110299666B (en) * | 2019-06-11 | 2020-11-10 | 上海交通大学 | Anthropomorphic method for automatic mode locking under various pulse states |
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| US12076276B2 (en) | 2019-07-19 | 2024-09-03 | Keranova | Cutting device with optical coupler including a polarisation corrector |
| CN114502119B (en) * | 2019-07-19 | 2024-09-27 | 克拉诺瓦公司 | Cutting device with optical coupler including polarization corrector |
| CN111716008A (en) * | 2020-06-18 | 2020-09-29 | 青岛自贸激光科技有限公司 | Laser processing system based on high-speed polarization control |
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Application publication date: 20130327 |