CN102879909B - Multiple beam shares the method that a grating carries out spectrum beam combination - Google Patents
Multiple beam shares the method that a grating carries out spectrum beam combination Download PDFInfo
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Abstract
The present invention is the device and method that a kind of multiple beam shares that a grating carries out spectrum beam combination, belong to semiconductor laser technique field, two identical laser array symmetry is placed on the normal OP both sides of grating, and the multi beam transmission direction that laser array exports respectively is parallel to each other, wavelength X
1, λ
2, λ
3the unit laser beam of monotone variation, after field lens deviation light path, incide on grating with different angles, and completely overlapping in hot spot space, grating place, then after grating effect, the unit light beam of laser array is overlapped near field and far field, form laser beam, the unit light beam of laser array overlaps near field and far field, forms laser beam, realizes high brightness laser respectively and exports.The method can be applicable to multiple laser array and carries out spectrum beam combination, makes laser system one-piece construction simply compact, is convenient to device miniaturization, integrated, reduces grating use amount simultaneously, reduces system cost.
Description
Technical field
The present invention relates to a kind of multiple beam and share the device and method that a grating carries out spectrum beam combination, belong to semiconductor laser technique field, espespecially a kind of multiple beam realizing high brightness laser output shares the device and method that a grating carries out spectrum beam combination.
Background technology
The ability that the brightness of laser can be focused for evaluating laser, brightness is higher, and represent that the ability that can be focused is stronger, the laser power density of acquisition is higher, and it is significant that the Laser output realizing high brightness is applied to the field such as national defence, industry for laser.Brightness is defined as follows:
Wherein P represents laser output power, and λ represents optical maser wavelength, and M2 represents the transmission factor of laser.General light beam closes Shu Fangfa, and as bundle is closed in space, when increasing laser power P, M2 increases, and overall brightness B is reduced on the contrary, and polarization and wavelength coupling method increase limited to the brightness B of entirety.
Spectrum beam combination technology is the effective ways realizing high brightness laser output, N is restrainted unit laser beam synthesis beam of laser and exports by it, transmission factor M2 and the unit light beam of outgoing laser beam are consistent, then realize under M2 permanence condition, output power is improved N doubly, thus laser brightness is improved N doubly.
Conventional spectrum beam combination is laser array and grating one_to_one corresponding; when multiple laser array closes bundle; need to adopt multiple grating; because the light path of each spectrum beam combination is very long, multiple independently spectrum beam combination light path, by making the volume of whole laser system very huge, is unfavorable for the miniaturization of laser system; the grating simultaneously adopted involves great expense; average every sheet price is up to tens thousand of Renminbi, and this also makes the cost of whole laser system greatly increase, and is unfavorable for the large-scale production of laser system.
Summary of the invention
In order to realize miniaturization, the high brightness laser system of low cost, the invention provides a kind of multiple beam realizing high brightness laser output and share the method that a grating carries out spectrum beam combination, laser array and grating one_to_one corresponding to solve conventional spectrum beam combination, when multiple laser array closes bundle, need to adopt multiple grating, because the light path of each spectrum beam combination is very long, multiple independently spectrum beam combination light path will make the volume of whole laser system very huge, be unfavorable for the miniaturization of laser system, the grating simultaneously adopted involves great expense, this also makes the cost of whole laser system greatly increase, be unfavorable for the problem of the large-scale production of laser system.Thus reach the integration of raising system, be convenient to whole system miniaturization, reduce the object of the cost of system simultaneously.
Technical scheme of the present invention is as follows:
Multiple beam shares the method that a grating carries out spectrum beam combination, it is characterized in that:
Comprise two identical laser arrays, two identical field lenses and grating, wherein two identical laser arrays are placed about axle OP symmetry, the multi beam transmission direction that each laser array in two identical laser arrays exports is parallel to each other, wavelength X 1, λ 2, the unit laser beam of λ 3 monotone variation, after field lens effect, incide on grating with different angles, and it is completely overlapping in hot spot space, grating place, require that each unit laser beam and corresponding incident angle meet the grating equation of identical angle of diffraction, then after grating effect, the unit laser beam of each laser array is overlapped near field and far field, form laser beam, realize high brightness laser respectively to export.
Combined by two groups of identical laser arrays and realize sharing a grating and carry out spectrum beam combination application process and be: the output unit light beam wavelength between the unit laser array during each group laser array combines is different, and all meet grating equation, and there is identical angle of diffraction, after field lens deviation light path, by grating effect, make the first laser array array output first laser beam, the second laser array array output second laser beam.
Tool of the present invention has the following advantages:
(1) integrated level is high, and multiple laser array carries out spectrum beam combination through same grating, forms effectively superposition, be convenient to the miniaturization realizing laser system between each light path;
(2) cost is low, and multiple laser array shares a grating and carries out spectrum beam combination, reduces the grating quantity involved great expense, is convenient to the large-scale production of laser system;
(3) high brightness laser bundle exports, and if laser array and laser array are the combination of multiple laser array, realizes the Laser output of more high brightness.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present invention;
Fig. 2 is semiconductor laser array schematic diagram of the present invention;
Fig. 3 is optical fiber output laser array schematic diagram of the present invention;
Fig. 4 is laser array unit light beam wavelength of the present invention, incident angle and angle of diffraction schematic diagram;
Fig. 5 is the conjunction bundle schematic diagram of the multiple laser array of the present invention.
Accompanying drawing implication: 1,1 ', N1, NN, N1 ', NN '. laser array, 11,12,13,11 ', 12 ', 13 '. laser array output unit light beam, 2,2 ', 21,2N, 21 ', 2N '. field lens, 3-grating, 4,4 ', N, N '. the laser output beam after spectrum beam combination, grating output terminal .A, another grating output terminal .A1.
Embodiment
As shown in Figure 1, be made up of two identical laser array (1,1 '), field lens (2,2 ') and gratings (3).The laser array (1 of two, 1 ') place about axle OP symmetry, wherein OP is the normal of grating, laser array (1, 1 ') the multi beam transmission direction exported is parallel to each other, the unit laser beam (11 of wavelength monotone variation, 12, 13 and 11 ', 12 ', 13 '), through field lens (2, 2 ') after effect, incide on grating (3) with different angles, and it is completely overlapping in hot spot space, grating (3) place, require unit laser beam (11, 12, 13 and 11 ', 12 ', 13 ') grating equation of identical angle of diffraction is met with corresponding incident angle, then after grating effect, make the unit laser beam (11 of laser array (1), 12, 13 and 11 ', 12 ', 13 ') overlap near field and far field, form laser beam (4), the unit laser beam (11 of laser array (1 '), 12, 13 and 11 ', 12 ', 13 ') overlap near field and far field, form laser beam (4 '), realize high brightness laser respectively to export.
The laser array (1 related in method, 1 ') can be semiconductor laser array, as shown in Figure 2, N number of luminous point on semiconductor laser array exports different wave length (λ 1, λ 2 ... λ N-1, λ N) unit laser beam, and wavelength linearly changes, also can be all solid state laser using optical fiber as output medium as shown in Figure 3 or fiber laser, wherein A1 represents fiber-optic output, the wavelength that every root optical fiber exports is different, then fiber-optic output is pressed wavelength monotone variation relation linear array.
The unit laser beam (11,12,13) that laser array (1,1 ') exports is after field lens (2) effect, and its angle and wavelength meet grating equation.As shown in Figure 4, if screen periods is Λ, unit laser beam (11,12,13) wavelength is respectively λ 1, λ 2, λ 3, incident angle on grating is θ 1, θ 2, θ 3, it is θ that outgoing laser beam has common angle of diffraction, optical grating diffraction level time is-1 grade, then unit light beam need meet following relationship:
Λ*(sinθ1+sinθ)＝-λ1；
Λ*(sinθ2+sinθ)＝-λ2；
Λ*(sinθ3+sinθ)＝-λ3；
Fig. 5 is the expansion of this patent, two groups of identical laser array combination (N1 ... NN and N1 ' ... NN ') realize share a grating carry out spectrum beam combination application, each group laser array combination (N1 ... NN) the output unit light beam wavelength between the unit laser array in is different, and all meet grating equation, and there is identical angle of diffraction.After various field lens deviation light paths, by grating effect, make the first laser array combination (N1 ... NN) the first laser beam N is exported, the second laser array combination (N1 ' ... NN ') export the second laser beam N '.
Claims (2)
1. multiple beam shares the method that a grating carries out spectrum beam combination, it is characterized in that:
Comprise two identical laser arrays (1, 1 '), two identical field lenses (2, 2 ') and grating (3), wherein two identical laser arrays (1, 1 ') place about axle OP symmetry, two identical laser arrays (1, 1 ') the multi beam transmission direction that each laser array in exports is parallel to each other, wavelength X 1, λ 2, the unit laser beam of λ 3 monotone variation, after field lens effect, incide on grating (3) with different angles, and it is completely overlapping in hot spot space, grating (3) place, require that each unit laser beam and corresponding incident angle meet the grating equation of identical angle of diffraction, then after grating effect, the unit laser beam of each laser array is overlapped near field and far field, form laser beam, realize high brightness laser respectively to export.
2. a multiple beam shares the method that a grating carries out spectrum beam combination, it is characterized in that: combine (N1 by two groups of identical laser arrays ... NN and N1 ' ... NN ') realize sharing a grating and carry out spectrum beam combination application process and be: the output unit light beam wavelength between the unit laser array in each group laser array combination is different, and all meet grating equation, and there is identical angle of diffraction, after field lens deviation light path, acted on by grating (3), make the first laser array combination (N1 ... NN) the first laser beam (N) is exported, second laser array combination (N1 ' ... NN ') export the second laser beam (N ').
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| CN103560384A (en) * | 2013-11-19 | 2014-02-05 | 山东海富光子科技股份有限公司 | Spectrum beam combining myriawatt fiber laser device based on volume Bragg gratings |
| CN107991781B (en) * | 2018-01-08 | 2021-01-29 | 广东省智能机器人研究院 | Method for eliminating unevenness of laser facula output by optical fiber by using spectrum beam combination |
| CN112241069A (en) * | 2020-10-15 | 2021-01-19 | 上海无线电设备研究所 | Optical fiber laser synthesis system |
| CN113794099B (en) * | 2021-11-15 | 2023-01-13 | 中国工程物理研究院激光聚变研究中心 | Composite spectrum synthesizer |
| CN115494650B (en) * | 2022-11-07 | 2023-03-21 | 中国航天三江集团有限公司 | Composite light beam synthesizing method and system |
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| CN102273030A (en) * | 2008-11-04 | 2011-12-07 | 麻省理工学院 | External-cavity one-dimensional multi-wavelength beam combining of two-dimensional laser elements |
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| CN200944495Y (en) * | 2006-09-08 | 2007-09-05 | 北京工业大学 | External cavity coherent phase-locking device of semiconductor laser for optical coupling |
| CN101482691A (en) * | 2008-01-07 | 2009-07-15 | 精工爱普生株式会社 | Illumination device, image display device, and projector |
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