CN111916977B - Laser spectrum synthesis system - Google Patents

Laser spectrum synthesis system Download PDF

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Publication number
CN111916977B
CN111916977B CN202010777818.XA CN202010777818A CN111916977B CN 111916977 B CN111916977 B CN 111916977B CN 202010777818 A CN202010777818 A CN 202010777818A CN 111916977 B CN111916977 B CN 111916977B
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laser
grating
optical fiber
reflector
fiber light
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CN111916977A (en
Inventor
黄晚晴
胡东霞
孙喜博
刘兰琴
张颖
耿远超
王文义
沈本剑
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Laser Fusion Research Center China Academy of Engineering Physics
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Laser Fusion Research Center China Academy of Engineering Physics
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    • 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
    • H01S3/2383—Parallel arrangements
    • H01S3/2391—Parallel arrangements emitting at different wavelengths
    • 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
    • H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
    • H01S3/0057—Temporal shaping, e.g. pulse compression, frequency chirping
    • 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
    • H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
    • H01S3/0071—Beam steering, e.g. whereby a mirror outside the cavity is present to change the beam direction
    • 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
    • H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
    • H01S3/0085—Modulating the output, i.e. the laser beam is modulated outside the laser cavity

Abstract

The invention discloses a laser spectrum synthesis system which comprises a plurality of optical fiber light sources capable of emitting lasers with different central wavelengths, a polished surface reflector for reflecting the lasers emitted by the optical fiber light sources and a grating for reflecting the lasers reflected by the polished surface reflector, wherein the grating is a reflection type diffraction grating, a plurality of beams of lasers emitted by the optical fiber light sources are incident on the polished surface reflector and are collimated into parallel lights while being reflected by the polished surface reflector, and a plurality of beams of lasers reflected by the polished surface reflector are incident on the same position on the grating according to diffraction angles corresponding to respective wavelengths and are reflected by the grating to realize laser spectrum synthesis. The system does not need to use a lens or other transmission elements to expand and collimate laser, avoids the absorption of the transmission elements to high-power laser, uses a polished reflector to simultaneously realize the expansion, collimation and incidence angle matching of the laser, and has simple structure.

Description

Laser spectrum synthesis system
Technical Field
The invention relates to the technical field of laser, in particular to a laser spectrum synthesis system.
Background
At present, high power fiber lasers are widely used in various applications because of their high energy conversion efficiency, excellent beam quality, and stable output. However, due to the limitations of damage, nonlinear effects and the like, further improvement of the output power density of a single optical fiber is limited, and to achieve output with higher power density, spectrum synthesis is an effective technical approach, the principle of spectrum synthesis is that N laser beams with different wavelengths are incident to the same position on a grating according to the diffraction angles corresponding to the wavelengths, the reflection angles of the N laser beams reflected from the position of the grating are consistent, the N laser beams achieve near-field overlapping and far-field pointing consistency, and power synthesis is achieved. However, since the aperture of the light emitted from the fiber optic source is small (depending on the fiber diameter) and the divergence angle is large, it is necessary to collimate and expand the light before it is incident on the grating.
The invention is provided to solve the above problems.
Disclosure of Invention
The invention aims to provide a laser spectrum synthesis system.
In order to achieve the purpose, the invention provides the following technical scheme:
a laser spectrum synthesis system comprises a plurality of optical fiber light sources capable of emitting lasers with different central wavelengths, a polished surface reflector used for reflecting the lasers emitted by the optical fiber light sources and a grating used for reflecting the lasers reflected by the polished surface reflector, wherein the grating is a reflection type diffraction grating, a plurality of beams of lasers emitted by the optical fiber light sources are incident on the polished surface reflector and are collimated into parallel light while being reflected by the polished surface reflector, and a plurality of beams of lasers reflected by the polished surface reflector are incident on the same position on the grating according to diffraction angles corresponding to respective wavelengths and are reflected by the grating to realize laser spectrum synthesis.
Preferably, the plurality of fiber light sources capable of emitting different central wavelengths are arranged in a one-dimensional manner.
Preferably, the incidence angles and incidence positions of the laser lights emitted by the fiber light sources with different central wavelengths incident on the parabolic reflectors are different.
Preferably, the position and the emitting angle of the laser emitted by the optical fiber light source are determined according to the central wavelength of the laser emitted by the optical fiber light source, the position of the parabolic reflector and various parameters of the grating.
Preferably, the method for setting the positions of the optical fiber light source, the parabolic reflector and the grating comprises the following steps:
(1) determining the position of the parabolic mirror, the equation for the parabolic mirror being: y is22Rx, where R is the focal distance of the parabola;
(2) the position of the grating and various parameters are determined,let the distance between the grooves of the grating be d, and the coordinates of the incident/reflection point of the laser on the grating be xg,yg]The included angle between the grating normal line and the x axis is theta, the emergent angle of the synthesized laser on the grating is alpha, and the central wavelength of the laser emitted by the optical fiber light source is lambdai(i ═ 1,2, …, n), the grating equation for the grating is: sin alpha + sin betai＝mλiAnd/d, wherein m is diffraction order, generally 1, and the incident angle beta of the laser reflected by the polished reflector and incident on the grating is calculated according to the grating equationi(i＝1,2,…,n)；
(3) According to the incident angle beta of the laser reflected by the polished reflector to the gratingiCalculating the included angle between the laser reflected by the polished reflector and the x axis as betaiTheta, combined with the laser passing point [ x ] reflected by the mirrorg,yg]Obtaining an equation of the laser reflected by the polished reflector;
(4) obtaining the intersection point [ x ] of the laser reflected by the parabolic reflector on the parabolic reflector according to the equation of the laser reflected by the parabolic reflector and the equation of the parabolic reflectorm,ym]；
(5) According to the intersection point [ x ] of the laser reflected by the parabolic reflector on the parabolic reflectorm,ym]Calculating a normal equation of the point;
(6) calculating an equation of the laser emitted by the optical fiber light source according to the equation of the laser reflected by the polished reflector obtained in the step (4), the normal equation in the step (5) and the reflection law, wherein an angle corresponding to the slope of the equation of the laser emitted by the optical fiber light source is an emergent angle of the optical fiber light source;
(7) the position of the fiber light source is obtained according to the equation of the laser emitted by the fiber light source.
Preferably, in step (7), the coordinates of the fiber light source can be obtained by extending the laser emitted by the fiber light source and intersecting the focal line of the parabolic mirror, where x is R/2 and the coordinates [ R/2, y ] of the fiber light source1],[R/2,y2],…,[R/2,yn]。
Compared with the prior art, the invention has the following beneficial effects:
compared with the spectral power synthesis system in the prior art, the laser spectrum synthesis system provided by the invention does not need to use a lens or other transmission elements for laser beam expansion and collimation, avoids the absorption of the transmission elements on high-power laser, simultaneously realizes the beam expansion, the collimation and the incidence angle matching of the laser by using one polished reflector, and has a simple structure.
Drawings
Fig. 1 is a schematic optical axis diagram of 10 laser beams synthesized in embodiment 2 of the present invention.
In the figure: 1-optical fiber light source, 2-polished reflector, 3-grating.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the present invention is described below in detail and completely with reference to the accompanying drawings. Based on the embodiments in the present application, other similar embodiments obtained by persons of ordinary skill in the art without any creative effort shall fall within the protection scope of the present application.
Example 1
The embodiment provides a laser spectrum synthesis system, which comprises a plurality of optical fiber light sources capable of emitting laser with different central wavelengths, the grating is a reflection-type diffraction grating, a plurality of optical fiber light sources capable of emitting different central wavelengths are arranged in a one-dimensional manner, a plurality of beams of laser emitted by the optical fiber light sources are incident on the parabolic reflector and are collimated into parallel light while being reflected by the parabolic reflector, a plurality of beams of laser reflected by the parabolic reflector are incident on the same position on the grating according to diffraction angles corresponding to respective wavelengths and are reflected by the grating to realize laser spectrum synthesis, and the incident angles and the incident positions of the laser emitted by the optical fiber light sources with different central wavelengths are different.
The method for setting the positions of the optical fiber light source, the polished reflector and the grating specifically comprises the following steps:
(1) determining the position of the parabolic mirror, the equation for the parabolic mirror being: y is22Rx, where R is the focal distance of the parabola;
(2) determining the position and parameters of the grating, setting the interval between lines of the grating as d and the coordinates of the incident/reflecting point of the laser on the grating as xg,yg]Setting the included angle between the grating normal line and the x axis as theta, the emergent angle of the synthesized laser on the grating as alpha, and the central wavelength of the laser emitted by the optical fiber light source as lambdai(i ═ 1,2, …, n), the grating equation for the grating is: sin alpha + sin betai＝mλiAnd/d, wherein m is diffraction order, generally 1, and the incident angle beta of the laser reflected by the polished reflector and incident on the grating is calculated according to the grating equationi(i＝1,2,…,n)；
(3) According to the incident angle beta of the laser reflected by the polished reflector to the gratingiCalculating the included angle between the laser reflected by the polished reflector and the x axis as betai-theta, in combination with the laser passing point [ x ]g,yg]Obtaining an equation of the laser reflected by the polished reflector;
(4) obtaining the intersection point [ x ] of the laser reflected by the parabolic reflector on the parabolic reflector according to the equation of the laser reflected by the parabolic reflector and the equation of the parabolic reflectorm,ym]；
(5) According to the intersection point [ x ] of the laser reflected by the parabolic reflector on the parabolic reflectorm,ym]Calculating a normal equation of the point;
(6) calculating an equation of the laser emitted by the optical fiber light source according to the equation of the laser reflected by the polished reflector obtained in the step (4), the normal equation in the step (5) and the reflection law, wherein an angle corresponding to the slope of the equation of the laser emitted by the optical fiber light source is an emergent angle of the optical fiber light source;
(7) the laser emitted by the optical fiber light source is extended to intersect with the focal line of the polished reflector to obtain the coordinate of the optical fiber light source, wherein the focal line of the polished reflector is x-R/2, and the coordinate of the optical fiber light source is [ R/2, y [ ]1],[R/2,y2],…,[R/2,yn]。
Determining the central wavelength lambda of the laser emitted by the fiber light sourceiAnd obtaining the emergent angle and the coordinate of the optical fiber light source after various parameters of the grating.
Example 2
In this embodiment, the position settings of the fiber light source, the parabolic reflector and the grating are described by taking 10 fiber light sources capable of emitting laser beams with different central wavelengths as examples, where the central wavelength λ of the laser beam isiThe equal spacing distribution is between 1053nm and 1071.817 nm.
The focal length R of the parabolic mirror is 2800mm, from which the equation of the parabolic mirror is determined, and after the equation of the parabolic mirror is determined, the position of the parabolic mirror is naturally determined.
The grating line spacing d is 1/1740mm, α is 63.5, the coordinates of the incident/reflected point of the laser on the grating are [1400,150], and θ is 68 °, thereby determining the position of the grating.
According to the method for determining the position and the emitting angle of the laser emitted by the optical fiber light source provided in embodiment 1, the position of the optical fiber light source is determined, and a schematic diagram of an optical axis of laser synthesis is shown in fig. 1, where 1 is the optical fiber light source, 2 is the parabolic mirror, and 3 is the grating.
The position and various parameters of the grating 3 can be selected according to requirements, and the emergent angle and the coordinates of the optical fiber light source 1 can be obtained according to the position and various parameters of the grating 3 and the central wavelength of the laser emitted by the optical fiber light source 1.
In this embodiment, when the numerical aperture of the light emitted from the fiber light source 1 is 0.06mm, the light has been collimated with a high degree of parallelism by calculating that the numerical aperture is about 0.0007mm after passing through the polished mirror.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (1)

1. A laser spectrum synthesis system is characterized by comprising a plurality of optical fiber light sources capable of emitting laser with different central wavelengths, a polished surface reflector for reflecting the laser emitted by the optical fiber light sources and a reflection grating for reflecting the laser reflected by the polished surface reflector, wherein the plurality of optical fiber light sources capable of emitting the laser with different central wavelengths are arranged in a one-dimensional manner, a plurality of beams of laser emitted by the optical fiber light sources are incident on the polished surface reflector and are collimated into parallel light while being reflected by the polished surface reflector, the plurality of beams of laser reflected by the polished surface reflector are incident on the same position on the reflection grating according to diffraction angles corresponding to respective wavelengths and are reflected by the reflection grating to realize laser spectrum synthesis, wherein the incident angles and the incident positions of the laser emitted by the optical fiber light sources with different central wavelengths incident on the polished surface reflector are different, the method for setting the positions of the optical fiber light source, the polished surface reflector and the reflection grating comprises the following steps:
(1) determining the position of the parabolic mirror, the equation for the parabolic mirror being: y is22Rx, where R is the focal distance of the parabola;
(2) determining the position and parameters of the reflecting grating, setting the interval between lines of the grating as d and the coordinates of the incident/reflecting point of the laser on the grating as xg,yg]The included angle between the grating normal line and the x axis is theta, the emergent angle of the synthesized laser on the grating is alpha, and the central wavelength of the laser emitted by the optical fiber light source is lambdai(i ═ 1,2, …, n), the grating equation of the reflection gratingComprises the following steps: sin alpha + sin betai＝mλiAnd m is diffraction order, and the incident angle beta of the laser reflected by the polished reflector and incident on the reflection grating is calculated according to the grating equationi(i＝1,2,…,n)；
(3) According to the incident angle beta of the laser reflected by the polished reflector to the reflection gratingiCalculating the included angle between the laser reflected by the polished reflector and the x axis as betaiTheta, combined with the laser passing point [ x ] reflected by the mirrorg,yg]Obtaining an equation of the laser reflected by the polished reflector;
(4) obtaining the intersection point [ x ] of the laser reflected by the parabolic reflector on the parabolic reflector according to the equation of the laser reflected by the parabolic reflector and the equation of the parabolic reflectorm,ym]；
(5) According to the intersection point [ x ] of the laser reflected by the parabolic reflector on the parabolic reflectorm,ym]Calculating a normal equation of the point;
(6) calculating an equation of the laser emitted by the optical fiber light source according to the equation of the laser reflected by the polished reflector obtained in the step (4), the normal equation in the step (5) and the emission law, wherein an angle corresponding to the slope of the equation of the laser emitted by the optical fiber light source is an emergent angle of the optical fiber light source;
(7) the coordinates of the optical fiber light source can be obtained by extending the laser emitted by the optical fiber light source and intersecting the focal line of the paraboloidal mirror, wherein the focal line of the paraboloidal mirror is x which is R/2, and the coordinates of the optical fiber light source are R/2, y1],[R/2,y2],…,[R/2,yn]。
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012000038A1 (en) * 2012-01-03 2013-07-04 Humboldt-Universität Zu Berlin laser device
CN104064948A (en) * 2013-03-22 2014-09-24 中国科学院大连化学物理研究所 Variable line selection stable resonant cavity suitable for air flow chemical laser

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
JP5775325B2 (en) * 2011-02-25 2015-09-09 浜松ホトニクス株式会社 Tunable light source
CN103633545A (en) * 2013-12-07 2014-03-12 山东海富光子科技股份有限公司 Difference-frequency tunable single-frequency terahertz source with external cavity strengthened
CN105305210B (en) * 2015-11-18 2018-04-13 中国工程物理研究院激光聚变研究中心 A kind of high-power all-fiber laser based on multi-core optical fiber
CN109787076B (en) * 2019-03-12 2024-04-19 中国工程物理研究院激光聚变研究中心 Thermally induced waveguide structure laser and laser amplifier

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012000038A1 (en) * 2012-01-03 2013-07-04 Humboldt-Universität Zu Berlin laser device
CN104064948A (en) * 2013-03-22 2014-09-24 中国科学院大连化学物理研究所 Variable line selection stable resonant cavity suitable for air flow chemical laser

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