CN113794098A - High-light-beam-quality spectrum beam combining device - Google Patents
High-light-beam-quality spectrum beam combining device Download PDFInfo
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- CN113794098A CN113794098A CN202111344061.6A CN202111344061A CN113794098A CN 113794098 A CN113794098 A CN 113794098A CN 202111344061 A CN202111344061 A CN 202111344061A CN 113794098 A CN113794098 A CN 113794098A
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- grating
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- fiber light
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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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08004—Construction or shape of optical resonators or components thereof incorporating a dispersive element, e.g. a prism for wavelength selection
- H01S3/08009—Construction or shape of optical resonators or components thereof incorporating a dispersive element, e.g. a prism for wavelength selection using a diffraction grating
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
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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
- H01S3/005—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
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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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
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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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08004—Construction or shape of optical resonators or components thereof incorporating a dispersive element, e.g. a prism for wavelength selection
Abstract
The invention discloses a high beam quality spectrum beam combining device, which comprises: the device comprises a one-dimensional fiber light source array, a compensation grating I, a compensation grating II, a beam combination grating I and a beam combination grating II which are sequentially arranged along the propagation direction of a light path; the one-dimensional optical fiber light source array is composed of a plurality of optical fiber light sources with different wavelengths, and light beams emitted by the optical fiber light sources are directed to be parallel. The high-beam-quality spectrum beam combining device provided by the invention improves the beam quality of the combined beam by performing dispersion compensation on the combined sub-beam.
Description
Technical Field
The invention belongs to the field of lasers, and particularly relates to a high-beam-quality spectrum beam combining device.
Background
The laser light source with high beam quality and high average power has important application prospect in the fields of industrial production, equipment manufacturing and the like. When the laser cutting device is applied to the field of laser cutting, the laser light source with higher average power and better beam quality means faster cutting speed and thicker cutting capacity; in the field of laser welding, laser light sources with higher average power and better beam quality mean finer weld quality and faster welding speeds. However, the output power of a single-fiber single-mode laser has an upper limit due to the influence of nonlinear effect and mode instability, and a beam combiner is generally used to couple the outputs of a plurality of fiber lasers in order to achieve a higher-power light source output, but the quality of the combined laser beam is poor due to the coupling mode (M is poor)2Not less than 15) and limits the use of high power lasers.
The spectrum synthesis technology is a technology for realizing high-power and high-beam-quality laser output, can synthesize a plurality of beams of laser with different wavelengths into one beam, and can keep better beam quality while improving the output total power level. The existing spectrum synthesis devices mainly have two types: the first type is a single grating beam combining device, in which multiple beams of laser are incident into a grating from different angles, and the beams with different wavelengths are combined into one beam by using the dispersion capability of the grating, although the device has a simple structure, the requirement on the width of a sub-beam is high, and only the output laser of an ultra-narrow line width laser (the spectral width of the laser is less than about 30 GHz) can be used as an input sub-beam light source. The second type is a double grating beam combining device, in which multiple beams of laser are incident on a first grating at the same angle, and the dispersion characteristics of the gratings are utilized to make multiple beams of light incident on a second grating to realize spatial overlapping, and the multiple beams of light are diffracted by the second grating to be combined into a beam of light, the device has the advantages of reducing the requirement of the beam line width, using a narrow-line-width laser (< 0.5nm) as a beam to be combined, and having the defect that the beam line width is continuously increased (> 0.5nm) along with the increase of the beam power, which leads to poor quality of output beams caused by the factor width of the combining device, and is difficult to realize the spectral combined output of high-power and high-quality beams.
Therefore, in order to improve the quality of the combined beam, the invention provides a high-beam-quality spectrum beam combining device.
Disclosure of Invention
In view of the above, the present invention provides a high beam quality spectrum beam combining device, which implements high power and high quality beam quality spectrum combining output, and facilitates application of the spectrum combining device.
In order to achieve the purpose, the invention adopts the following technical scheme: a high beam quality spectral combining apparatus, the apparatus comprising: the device comprises a one-dimensional fiber light source array, a compensation grating I, a compensation grating II, a beam combination grating I and a beam combination grating II which are sequentially arranged along the propagation direction of a light path; the one-dimensional optical fiber light source array is composed of a plurality of optical fiber light sources with different wavelengths, light beams emitted by the optical fiber light sources point to be parallel, the polarization directions are the same, and the polarization directions are vertical to the incident plane of the sub-beams; the compensation grating I and the compensation grating II are used for providing an anomalous dispersion for each synthesized sub-beam and compensating the dispersion of the beam combination grating; the reticle densities of the compensation grating I, the compensation grating II, the beam combination grating I and the beam combination grating II are the same and are parallel to each other.
Preferably, the distance between the compensation grating I and the compensation grating II is half of the distance between the beam combining grating I and the beam combining grating II.
Preferably, when the one-dimensional fiber light source array is a linearly polarized fiber light source, the compensation grating I, the compensation grating II, the beam combination grating I and the beam combination grating II are all polarization gratings.
Preferably, when the plurality of unpolarized optical fiber light sources or polarized light sources with different polarization directions are used, the compensation grating i, the compensation grating ii, the beam combining grating i and the beam combining grating ii are polarization-independent gratings.
Preferably, the emission light beam of the one-dimensional fiber light source array has a center wavelengthλ c1Is incident on the compensation grating I at an angle with the central wavelength asλ c2The littrow angle of (a) is incident to the beam combining grating I.
Preferably, the center wavelengthλ c1And center wavelengthλ c2Are equal.
The invention has the beneficial effects that: the spectrum synthesis device capable of improving the quality of the output light beam carries out dispersion compensation on the synthesized sub-beams by arranging two pairs of gratings, wherein the compensation gratings carry out dispersion pre-compensation on the light beams, and the beam combination gratings carry out further dispersion compensation on the light beams while realizing beam combination, so that the quality of the light beams of the synthesized light beams is improved. The device disclosed by the invention can obviously improve the beam quality of the synthesized beam and has the capability of realizing high-power and high-quality beam quality output.
Drawings
FIG. 1 is a schematic structural diagram of a spectrum combining apparatus capable of improving the quality of an output light beam according to the present invention;
in the figure: 1. the one-dimensional optical fiber light source array 2, the compensation grating I3, the compensation grating II 4, the beam combination grating I5 and the beam combination grating II.
Detailed Description
It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.
The invention is described in detail below with reference to the figures and specific embodiments.
A spectral combining apparatus for improving the quality of an output beam as shown in fig. 1, said apparatus comprising: the optical fiber grating light source array comprises a one-dimensional optical fiber light source array 1, a compensation grating I2, a compensation grating II 3, a beam combination grating I4 and a beam combination grating II 5 which are sequentially arranged along the propagation direction of an optical path; the one-dimensional optical fiber light source array 1 is composed of a plurality of optical fiber light sources with different wavelengths, light beams emitted by the optical fiber light sources point to be parallel, the polarization directions are the same, the polarization directions are perpendicular to a sub-beam incidence plane, the light beams are incident to the compensation grating I2 at the same angle, the light beams are incident to the compensation grating II 3 after being dispersed by the compensation grating I2, the groove densities of the compensation grating I2 and the compensation grating II 3 are the same, and the grid line direction and the light-facing surface are parallel to each other.
After the narrow-linewidth laser beams emitted by the one-dimensional fiber light source array 1 are subjected to dispersion pre-compensation through the compensation grating I2 and the compensation grating II 3, the sub-beams still keep proper space intervals and point to be parallel, and the spectrums of the light sources of the sub-beams are separated in space; the one-dimensional optical fiber light source array 1 subjected to dispersion compensation by the compensation grating II 3 enters the beam combination grating I4 at the same incident angle, is diffracted by the beam combination grating I4, is overlapped on the beam combination grating II 5 to form a light spot, and is diffracted by the beam combination grating II 5 to be synthesized into a beam of light source which is overlapped in space. After the sub-beam light source is subjected to dispersion compensation through the compensation grating I2 and the compensation grating II 3, the beam quality of the light beam synthesized by the beam combination grating II 5 can be effectively improved.
The linear density of the beam combination grating I is the same as that of the beam combination grating II, and the grid line direction and the light-facing surface are parallel to each other.
According to one embodiment, the linear densities of the compensation grating I, the compensation grating II, the beam combination grating I and the beam combination grating II are the same, and the grid line direction and the light-facing surface are parallel to each other.
The distance between the compensation grating I and the compensation grating II is half of the distance between the beam combination grating I and the beam combination grating II.
As an embodiment, when the one-dimensional fiber light source array is a linearly polarized fiber light source, the compensation grating I, the compensation grating II, the beam combination grating I and the beam combination grating II are all polarization gratings.
As an embodiment, if the one-dimensional fiber light source array is a plurality of unpolarized fiber light sources or polarized light sources with different polarization directions, the compensation grating I, the compensation grating II, the beam combining grating I and the beam combining grating II are all polarization-independent gratings.
Claims (7)
1. A high beam quality spectral combining apparatus, comprising: the optical fiber grating light source array comprises a one-dimensional optical fiber light source array (1), a compensation grating I (2), a compensation grating II (3), a beam combination grating I (4) and a beam combination grating II (5) which are sequentially arranged along the propagation direction of a light path;
the one-dimensional optical fiber light source array (1) is composed of a plurality of optical fiber light sources with different central wavelengths, light beams emitted by the optical fiber light sources point to be parallel, the polarization directions are the same, and the polarization directions are vertical to a sub-beam incidence plane;
the groove densities of the compensation grating I (2), the compensation grating II (3), the beam combination grating I (4) and the beam combination grating II (5) are the same, and the grid line direction and the light-facing surface are parallel to each other.
2. A high beam quality spectral beam combining apparatus according to claim 1, wherein the distance between compensation grating i (2) and compensation grating ii (3) is adjustable.
3. The high beam quality spectral beam combining apparatus of claim 2, wherein the distance between the compensation grating i (2) and the compensation grating ii (3) is half the distance between the beam combining grating i (4) and the beam combining grating ii (5).
4. The high beam quality spectrum beam combining device according to claim 1, wherein when the one-dimensional fiber light source array (1) is a linearly polarized fiber light source, the compensation grating i (2), the compensation grating ii (3), the beam combining grating i (4), and the beam combining grating ii (5) are all polarization-dependent gratings.
5. The high beam quality spectrum beam combining device according to claim 1, wherein when the one-dimensional fiber light source array (1) is a plurality of unpolarized fiber light sources or polarized light sources with different polarization directions, the compensation grating i (2), the compensation grating ii (3), the beam combining grating i (4), and the beam combining grating ii (5) are all polarization-independent gratings.
6. The high beam quality spectral beam combining device of claim 1, wherein the emission beam of the one-dimensional fiber optic source array (1) has a center wavelengthλ c1Is incident on the compensation grating I (2) at an angle with the central wavelength asλ c2The littrow angle of (a) is incident to the beam combining grating I (4).
7. The high beam quality spectral combining apparatus of claim 1, wherein the center wavelengthλ c1And center wavelengthλ c2Are equal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111344061.6A CN113794098A (en) | 2021-11-15 | 2021-11-15 | High-light-beam-quality spectrum beam combining device |
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| CN202111344061.6A CN113794098A (en) | 2021-11-15 | 2021-11-15 | High-light-beam-quality spectrum beam combining device |
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| CN113794098A true CN113794098A (en) | 2021-12-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115079426A (en) * | 2022-07-19 | 2022-09-20 | 中国科学院长春光学精密机械与物理研究所 | Spectrum beam combining device and method |
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| CN104901149A (en) * | 2015-05-05 | 2015-09-09 | 中国科学院上海光学精密机械研究所 | Spectral beam combining system based on three diffraction gratings |
| CN105244752A (en) * | 2015-10-30 | 2016-01-13 | 中国工程物理研究院应用电子学研究所 | Composite spectrum synthesis device |
| US9991678B1 (en) * | 2014-07-30 | 2018-06-05 | Northrop Grumman Systems Corporation | Dispersion compensated diffractive optical element beam combiner |
| WO2020156730A1 (en) * | 2019-01-31 | 2020-08-06 | Rheinmetall Waffe Munition Gmbh | Device for combining at least two laser beams |
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2021
- 2021-11-15 CN CN202111344061.6A patent/CN113794098A/en active Pending
Patent Citations (4)
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|---|---|---|---|---|
| US9991678B1 (en) * | 2014-07-30 | 2018-06-05 | Northrop Grumman Systems Corporation | Dispersion compensated diffractive optical element beam combiner |
| CN104901149A (en) * | 2015-05-05 | 2015-09-09 | 中国科学院上海光学精密机械研究所 | Spectral beam combining system based on three diffraction gratings |
| CN105244752A (en) * | 2015-10-30 | 2016-01-13 | 中国工程物理研究院应用电子学研究所 | Composite spectrum synthesis device |
| WO2020156730A1 (en) * | 2019-01-31 | 2020-08-06 | Rheinmetall Waffe Munition Gmbh | Device for combining at least two laser beams |
Non-Patent Citations (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115079426A (en) * | 2022-07-19 | 2022-09-20 | 中国科学院长春光学精密机械与物理研究所 | Spectrum beam combining device and method |
| CN115079426B (en) * | 2022-07-19 | 2023-08-22 | 中国科学院长春光学精密机械与物理研究所 | Spectrum beam combining device and method |
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Application publication date: 20211214 |