CN106300001A - Optical-fiber laser Spectral beam combining device and method - Google Patents
Optical-fiber laser Spectral beam combining device and method Download PDFInfo
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- CN106300001A CN106300001A CN201610888564.2A CN201610888564A CN106300001A CN 106300001 A CN106300001 A CN 106300001A CN 201610888564 A CN201610888564 A CN 201610888564A CN 106300001 A CN106300001 A CN 106300001A
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- fiber laser
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- prismatic film
- beam combining
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 44
- 230000003595 spectral effect Effects 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000006073 displacement reaction Methods 0.000 claims abstract description 47
- 238000012360 testing method Methods 0.000 claims abstract description 11
- 238000005457 optimization Methods 0.000 claims abstract description 8
- 238000013461 design Methods 0.000 claims abstract description 5
- 239000010408 film Substances 0.000 claims description 44
- 238000001228 spectrum Methods 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 6
- 239000010409 thin film Substances 0.000 claims description 6
- 230000005855 radiation Effects 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 abstract description 4
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- 238000003786 synthesis reaction Methods 0.000 abstract description 3
- 230000010287 polarization Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000005286 illumination Methods 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 238000012512 characterization method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 241000931526 Acer campestre Species 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000005566 electron beam evaporation Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000009022 nonlinear effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000004304 visual acuity Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
Abstract
The invention discloses a kind of optical-fiber laser Spectral beam combining device and method, belong to laser optics technical field.Optical-fiber laser Spectral beam combining device includes optical fiber laser and collimating lens, and optical fiber laser is provided with Bit andits control platform；Also including super prismatic film, spectroscope and the Displacement Feedback system arranged along light path, spectroscope is provided with position adjustment；Optical fiber laser, Bit andits control platform, position adjustment and Displacement Feedback system are by master control system control.Optical-fiber laser Spectral beam combining method includes the design of super prismatic film, characteristic test, incident laser Spectral beam combining.The present invention single group device realizes the synthesis of many incident beams, it is to avoid cascade, and it is little to close school difficulty of getting one's things ready, and system stability is high；Super prismatic film element is relatively low to laser energy absorption, beneficially improving laser load capacity；Polarization characteristic is relied on less relative to grating class device by super prismatic film device, is conducive to polarizing device unrelated optimization, promotes the conjunction bundle efficiency to unpolarized optical-fiber laser.
Description
Art
The present invention relates to High-power Laser Technologies, especially optical-fiber laser Spectral beam combining, belong to laser optics technical field.
Background technology
At present, it is high that the relatively conventional laser instrument of high-performance optical fibre laser has efficiency, good beam quality, and power output is stable
Etc. feature, it it is the good selection of high power laser system.But for simple optical fiber laser instrument, its output can be subject to
Nonlinear effect, the restriction of the factors such as hot injury, it is difficulty with high power laser light output.Utilize Spectral beam combining beam combination technology, energy
Power density in enough effectively lifting unit ares, is an up the effective technical way of fiber laser device output.
The Technology Ways realizing high efficiency Spectral beam combining is to utilize the dispersion characteristics of Dispersive Devices to realize certain incident bar
The common aperture synthetic of different wave length beamlet under part, wherein Dispersive Devices is to ensure that the Primary Component that high efficiency synthesizes.Enter at present
The Dispersive Devices type that row Spectral beam combining is conventional is mainly plane grating and Volume Bragg grating, due to being sent out of optical fiber laser
The light gone out is non-polarized light, i.e. comprises s light component and comprises again p light component, realize high efficiency Spectral beam combining need to realize right
Both polarized components all realize higher diffraction efficiency, and thus design and preparation to device propose the highest requirement,
Final Project Realization has the biggest difficulty；Spectral beam combining scheme based on Volume Bragg grating the most all uses level link
Structure, the stability of such system can be affected by the biggest, and under continuous wave laser action, the heat effect of device can cause device
The abrupt degradation of performance；If the device that utilized grating device is transmission-type, can produce the strongest when carrying out Spectral beam combining
Heat absorption, reduce device continuous laser load capacity, and then the stability of Spectral beam combining can be affected, be more than existing spectrum
The weak point of synthesis Dispersive Devices.
Summary of the invention
In order to overcome the above-mentioned deficiency of existing Spectral beam combining technology, the present invention provides a kind of optical fiber based on super prismatic film
Laser spectrum synthesizer and method.
Due to the strong dispersion effect in super prism devices, can produce to a certain degree in the case of different wave length incidence
Space displacement differentiate, the space displacement utilizing different wave length to produce in super prism devices can carry out spectrum beam combination.This
Bright propose a kind of super prismatic film device being applied to Spectral beam combining, and the demand for Spectral beam combining proposes super prism
Method that thin film is optimized and the Spectral beam combining device of correspondence.
The technical solution adopted for the present invention to solve the technical problems is:
Optical-fiber laser Spectral beam combining device, including optical fiber laser and collimating lens, optical fiber laser is provided with displacement control
Platform processed；Also including super prismatic film, spectroscope and the Displacement Feedback system arranged along light path, spectroscope is provided with position adjustment system
System；Optical fiber laser, Bit andits control platform, position adjustment and Displacement Feedback system are by master control system control；Super prismatic film
Bottom is provided with heat radiation substrate.
Optical-fiber laser Spectral beam combining method, comprises the following steps:
A. surpass prismatic film to design:
The Gaussian spectrum method of development is utilized to calculate different wave length incident illumination space displacement of eye point after film system transmits, profit
The capacity usage ratio of film system is calculated with transfer matrix method；According to obtained space displacement and capacity usage ratio information, calculate pin
Super prismatic film object function MF to spectrum beam combination demand:
In formula, F is the weight evaluating space displacement, and N is sample point quantity, GiAnd RiFor each sampling during optimizing
The space displacement of wavelength and capacity usage ratio,WithOptimization aim space displacement and Energy harvesting for each sampling wavelength
Rate, Δ GiWith Δ RiThe space displacement can tolerated for each sampling wavelength and capacity usage ratio；Based on object function to super prism
Membrane structure is optimized and prepares；
B. prismatic film characteristic test is surpassed:
Test preparing produced space displacement when gained surpasses the same incidence point incidence of prismatic film, obtain ripple
The corresponding relation of long λ and space displacement S；
C. incident laser Spectral beam combining:
According to institute test space displacement S, regulate incident optical laser positions so that it is at the incoming position of super prismatic film
With space displacement S one_to_one corresponding measured before；Imageing sensor is utilized to build Displacement Feedback system, to optical fiber laser position
Put and be finely adjusted, make shoot laser at same eye point with same angle outgoing, spectroscope is receded from light path, complete laser and close
Bundle.
The invention has the beneficial effects as follows, utilize single group device to realize the synthesis of many incident beams, it is to avoid cascade, close school of getting one's things ready difficult
Spending little, system stability is high；Super prismatic film element can use low absorption dielectric material to be coated with, and device is reflective device
Part, relatively low to laser energy absorption, beneficially improving laser load capacity；Super prismatic film device is relative to grating class device pair
Polarization characteristic relies on less, is conducive to polarizing device unrelated optimization, promotes the conjunction bundle to unpolarized optical-fiber laser and imitates
Rate.
The ultimate principle of the present invention is: in photon crystal structure, for the electromagnetic wave of wavelength near forbidden band, its group velocity
When certain angle of incidence, the change to wavelength is very sensitive, and at this moment device shows the strongest dispersion characteristics, is referred to as super rib
Mirror effect.By super prism effect, membrane structure introduces some special structures and can realize different wave length incident illumination
Eye point spatial discrimination, the mechanism modulating multi-wavelength spatial discrimination in thin film is the incident degree of depth of modulation and energy storage mechanism, profit
Super prism effect in thin film can be optimized by both mechanism.Spectral beam combining device based on super prismatic film,
Carry out when closing bundle, utilizing precision displacement platform to control the multichannel incident illumination of the identical different wave length of incident angle in super prismatic film
On incoming position, utilize feedback system to be adjusted, the laser that can realize making different wave length incident under certain condition exists
Same point, with the outgoing of angle, completes multi-path laser aperture synthetic altogether.
Accompanying drawing explanation
Fig. 1 is optical-fiber laser Spectral beam combining equipments overall structure schematic diagram of the present invention；
Fig. 2 is super prismatic film space displacement test schematic diagram in the present invention；
Fig. 3 is super prismatic film space displacement curve chart in 1060-1064nm wave band.
Parts and numbering in figure:
1-optical fiber laser, 1-1 Bit andits control platform,
2 collimating lens, 3 surpass prismatic film, 4 heat radiation substrates,
5 spectroscopes, 5-1 position adjustment,
6 Displacement Feedback systems, 7 master control systems, 8 monochromators, 9 imageing sensors.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further described.
As it is shown in figure 1, optical-fiber laser Spectral beam combining device, including optical fiber laser 1 and collimating lens 2, optical fiber laser 1
It is provided with Bit andits control platform 1-1；Also include super prismatic film 3, spectroscope 5 and Displacement Feedback system 6, the light splitting arranged along light path
Mirror 5 is provided with position adjustment 5-1；Optical fiber laser 1, position adjustment 5-1 and Displacement Feedback system 6 are by master control system
7 control；It is provided with heat radiation substrate 4 bottom super prismatic film 3.
Bit andits control platform 1-1 Adjustment precision is 1 micron, the position of optical fiber laser can be carried out two-dimension adjustment.
Super prismatic film 3 is reflective thin film, and available super prism effect realizes dividing the space of different wave length incident illumination
Distinguish.
Master control system 7 is computer, and displacement control station 1-1 is adjusted by the information provided by Displacement Feedback system 6
Whole.
Spectroscope 5 can be withdrawn light path after having carried out optical fiber laser 1 position adjustment by position adjustment 5-1.Displacement
Feedback system 6 is monitored in real time wait closing Shu Jiguang displacement information after super prismatic film 3.
Optical-fiber laser Spectral beam combining method, comprises the following steps:
A. surpass prismatic film to design:
Shu Sanlu optical maser wavelength to be closed is respectively λ1=1064nm, λ2=1063.3nm, λ3=1060nm, is incident to thin film
During surface, beam radius is 500 μm.According to closing bundle demand, setting super prismatic film optimization object function MF, its calculating formula is:
Space displacement optimization aim produced by the wavelength of Shi Zhong tri-roadBeing set to 0 μm, 600 μm, 1200 μm, reflectance is excellent
Change targetIt is disposed as 90%, for starting film system, membrane structure is optimized with cavity resonator structure or chirped mirror structure；?
N=3 in this suboptimization, p=2, F1=0.5, F2=0.5, think that when being optimized to MF≤0.05 optimization completes；Based on optimizing knot
Structure, utilizes sputtering or the method for electron beam evaporation plating, is prepared super prismatic film.
B. prismatic film characteristic test is surpassed:
Utilize photoelectric detector that the spatial resolving power of super prismatic film is carried out preliminary characterization, as carrying out spectrum conjunction
The foundation become.
Utilize the light path shown in Fig. 2, synthetic laser required under specific incident angle is surpassed prismatic film preparing gained
During same incidence point incidence, produced space displacement is tested, and obtains the corresponding relation of wavelength and space displacement.Test side
Method is that optical fiber laser 1 goes out light through monochromator 8, collimating lens 2, the super prismatic film 3 of rear arrival, reflection light entrance imageing sensor
In 9, the laser of master control system (computer) the 7 pairs of different wave lengths change in displacement after super prismatic film 3 is utilized to be analyzed,
Draw the corresponding relation of the light wavelength lambda on super prismatic film surface and space displacement S.Test result in this example is as it is shown on figure 3, ripple
The light of a length of 1060nm, 1063.3nm and 1064nm produced space displacement S when 45° angle incidence be respectively 0 μm, 520 μm,
1100μm。
C. incident laser Spectral beam combining:
Seeing Fig. 1, Shu Jiguang way n=3 to be closed, it is respectively λ through the wavelength of optical fiber laser 1 output1=
1064nm,λ2=1063.3nm, λ3=1060nm, is incident in super prismatic film 3, and spot diameter is 500 μm.Utilize displacement control
The position of platform 1-1 processed regulation optical fiber laser 1, makes light beams to be closed spacing of incoming position in super prismatic film 3 be respectively
S1=520 μm, S2=1100 μm.Optical fiber laser position is entered through command displacement platform according to super prismatic film preliminary characterization
Row coarse adjustment, utilizes Displacement Feedback system 6 to be finely adjusted optical fiber laser 1 position, in the situation meeting incidence point location matches
Under, eye point can realize overlapping, and exit direction is consistent, after having adjusted, spectroscope 5 is withdrawn from light path, it is achieved aperture synthetic altogether.
In the above-described example, incident angle of light, lambda1-wavelength and conjunction bundle way and parameters optimization can be according to demand
It is adjusted, and selects to meet the super prismatic film closing bundle demand.
Claims (5)
1. an optical-fiber laser Spectral beam combining device, including optical fiber laser (1) and collimating lens (2), on optical fiber laser (1)
It is provided with Bit andits control platform (1-1)；It is characterized in that, also include super prismatic film (3), spectroscope (5) and the position arranged along light path
Moving feedback system (6), spectroscope (5) is provided with position adjustment (5-1)；Optical fiber laser (1), position adjustment (5-
1) and Displacement Feedback system (6) by master control system (7) control；Super prismatic film (3) bottom is provided with heat radiation substrate (4).
Optical-fiber laser Spectral beam combining device the most according to claim 1, it is characterised in that described Bit andits control platform (1-
1) Adjustment precision is 1 micron.
Optical-fiber laser Spectral beam combining device the most according to claim 1, it is characterised in that described super prismatic film (3)
For reflective thin film.
Optical-fiber laser Spectral beam combining device the most according to claim 1, it is characterised in that described master control system (7) is
Computer.
5. an optical-fiber laser Spectral beam combining method, it is characterised in that comprise the following steps:
A. surpass prismatic film to design:
Calculating is for the super prismatic film object function MF of spectrum beam combination demand:
In formula, F is the weight evaluating space displacement, and N is sample point quantity, GiAnd RiFor each sampling wavelength during optimizing
Space displacement and capacity usage ratio,WithOptimization aim space displacement and capacity usage ratio, Δ for each sampling wavelength
GiWith Δ RiThe space displacement can tolerated for each sampling wavelength and capacity usage ratio；
B. prismatic film characteristic test is surpassed:
Test preparing produced space displacement when gained surpasses the same incidence point incidence of prismatic film (3), obtain ripple
The corresponding relation of long λ and space displacement S；
C. incident laser Spectral beam combining:
According to institute test space displacement S, regulate incident optical laser instrument (1) position so that it is in the incident position of super prismatic film (3)
Put and space displacement S one_to_one corresponding measured before；Imageing sensor (9) is utilized to build Displacement Feedback system (6), to optical fiber
Laser instrument (1) position is finely adjusted, and makes shoot laser at same eye point with same angle outgoing, is receded from by spectroscope (5)
Light path, completes to swash combiner.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610888564.2A CN106300001A (en) | 2016-10-11 | 2016-10-11 | Optical-fiber laser Spectral beam combining device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610888564.2A CN106300001A (en) | 2016-10-11 | 2016-10-11 | Optical-fiber laser Spectral beam combining device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115128820A (en) * | 2022-08-30 | 2022-09-30 | 中国科学院长春光学精密机械与物理研究所 | Chirp reflection type volume Bragg grating feedback spectrum beam combining device and method |
| CN115494650A (en) * | 2022-11-07 | 2022-12-20 | 中国航天三江集团有限公司 | Composite light beam synthesizing method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020018298A1 (en) * | 2000-05-02 | 2002-02-14 | Miller David A. B. | Method for dispersing light using multilayered structures |
| US20020122613A1 (en) * | 2000-12-04 | 2002-09-05 | Shigeo Kittaka | Optical device and spectroscopic and integrated optical apparatus using the same |
| US20040008928A1 (en) * | 2002-07-12 | 2004-01-15 | Martina Gerken | Apparatus and method employing multilayer thin-film stacks for spatially shifting light |
| US20050141893A1 (en) * | 2003-12-26 | 2005-06-30 | Chih-Tsung Shih | Power polarization beam combiner and its applications in fiber communication |
| CN205195039U (en) * | 2015-12-21 | 2016-04-27 | 中国工程物理研究院流体物理研究所 | Spectrum synthesis system based on multiplexing body holographic grating |
| CN206148792U (en) * | 2016-10-11 | 2017-05-03 | 成都精密光学工程研究中心 | Optic fibre laser spectrum synthesizer |
-
2016
- 2016-10-11 CN CN201610888564.2A patent/CN106300001A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020018298A1 (en) * | 2000-05-02 | 2002-02-14 | Miller David A. B. | Method for dispersing light using multilayered structures |
| US20020122613A1 (en) * | 2000-12-04 | 2002-09-05 | Shigeo Kittaka | Optical device and spectroscopic and integrated optical apparatus using the same |
| US20040008928A1 (en) * | 2002-07-12 | 2004-01-15 | Martina Gerken | Apparatus and method employing multilayer thin-film stacks for spatially shifting light |
| US20050141893A1 (en) * | 2003-12-26 | 2005-06-30 | Chih-Tsung Shih | Power polarization beam combiner and its applications in fiber communication |
| CN205195039U (en) * | 2015-12-21 | 2016-04-27 | 中国工程物理研究院流体物理研究所 | Spectrum synthesis system based on multiplexing body holographic grating |
| CN206148792U (en) * | 2016-10-11 | 2017-05-03 | 成都精密光学工程研究中心 | Optic fibre laser spectrum synthesizer |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115128820A (en) * | 2022-08-30 | 2022-09-30 | 中国科学院长春光学精密机械与物理研究所 | Chirp reflection type volume Bragg grating feedback spectrum beam combining device and method |
| CN115128820B (en) * | 2022-08-30 | 2022-11-08 | 中国科学院长春光学精密机械与物理研究所 | Chirp reflection type volume Bragg grating feedback spectrum beam combining device and method |
| CN115494650A (en) * | 2022-11-07 | 2022-12-20 | 中国航天三江集团有限公司 | Composite light beam synthesizing method and system |
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