CN111694162B - Spectrum synthesis method and device - Google Patents
Spectrum synthesis method and device Download PDFInfo
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- CN111694162B CN111694162B CN202010575591.0A CN202010575591A CN111694162B CN 111694162 B CN111694162 B CN 111694162B CN 202010575591 A CN202010575591 A CN 202010575591A CN 111694162 B CN111694162 B CN 111694162B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/1086—Beam splitting or combining systems operating by diffraction only
Abstract
The invention discloses a spectrum synthesis method and a spectrum synthesis device, and aims to solve the technical problems that the number of synthesized paths is only dozens of paths and the quality of a finally spectrum synthesized light beam cannot be ensured in the prior art. The invention adopts tunable technology to divide a wide-spectrum super-fluorescence light source, realizes hundreds of seed laser divisions, realizes the output of upper-kilowatt narrow-linewidth fiber lasers through an adjustable filtering power amplifying component, realizes spectrum synthesis through a diffraction grating and a dense fiber array, divides a part of light as reference light, performs spectrum transformation through the front-section tunable technology, realizes the establishment of final feedback control, and ensures the final light beam quality. The spectrum synthesis method and the device can realize the spectrum synthesis of dozens or even hundreds of paths in a limited space, overcome the degradation of light beam quality caused by external factors such as temperature, humidity, jitter and the like by establishing a real-time feedback control system, and ensure the action effect of the spectrum synthesis.
Description
Technical Field
The invention relates to spectrum synthesis of high-power high-beam-quality optical fiber laser output, in particular to a spectrum synthesis method and a spectrum synthesis device.
Background
The spectrum synthesis technology adopts a dispersion optical element to synthesize optical fiber lasers with different wavelengths into a laser beam for output, and is an effective technical approach for realizing a high-brightness and high-power optical fiber laser system at present because the spectrum synthesis technology has the characteristics of simple structure, strong expansibility, good quality of the synthesized light beam, no need of complex regulation and control and the like.
In the prior art, in order to ensure the beam quality of a spectrum combination beam, the line width of each path of laser needs to be less than 35GHz, but due to the influence of the problems of stimulated Brillouin scattering, self-phase modulation, unstable mode and the like, the difficulty in improving the output power of single-path narrow-line-width optical fiber laser is high, in the application process, the quality of the system spectrum synthesis beam is deteriorated due to thermal distortion, environmental temperature change, jitter and the like, and the application effect is influenced.
Disclosure of Invention
The invention aims to solve the technical problems that the number of synthesized paths is only dozens of paths and the quality of the finally spectrally synthesized light beam cannot be ensured in the spectral synthesis method in the prior art, and provides a spectral synthesis method and a device.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the spectral synthesis method is characterized by comprising the following steps:
step 1) splitting an initial light source into a plurality of paths of seed broad spectrum light sources;
step 2) wavelength tuning is carried out on each seed broad spectrum light source to form a narrow line width light source;
step 3) carrying out power amplification on each narrow line width light source;
step 4) densely arranging the multi-path narrow linewidth light sources after power amplification to form an optical fiber array;
step 5) collimating and integrally focusing each path of light beam in the optical fiber array to focus all the light beams at a focus;
step 6), synthesizing light paths at the focus to form a spectrum synthesized light beam;
step 7) splitting the spectrum synthesized light beam to form reflected light and transmitted light;
inputting the reflected light to a power meter or a target surface;
and (3) imaging the transmitted light after focusing, and controlling the tuning wavelength in the step 2) according to the imaging effect so as to control the light beam quality output by the reflected light.
Further, the initial light source in the step 1) is a broad-spectrum super-fluorescent light source.
Further, the reflected light in step 7) accounts for more than 99% of the combined optical path.
Further, each narrow linewidth light source in the step 3) sequentially passes through the pump beam combiner and the amplifier gain fiber to amplify the power of the narrow linewidth light source.
Further, the transmitted light in the step 7) is focused by a focusing lens and then enters the CCD for imaging.
Based on the spectrum synthesis method, the invention also provides a spectrum synthesis device, which is characterized in that: the device comprises a laser light source, a beam splitter, an adjustable filtering power amplifying assembly, a zoom reflector, a diffraction grating, a beam splitter, a focusing lens and a CCD (charge coupled device) which are arranged in sequence;
the laser light source emits a wide-spectrum initial light source;
the beam splitter divides the initial light source into a plurality of paths of seed broad spectrum light sources;
each path of seed broad spectrum light source is provided with an adjustable filtering power amplification component;
the adjustable filtering power amplification component comprises a tunable filter, a pumping beam combiner and a gain optical fiber;
the optical signal input end of the tunable filter is used for receiving a seed broad spectrum light source;
the optical signal input end of the pumping beam combiner is connected with the optical signal output end of the tunable filter, the pumping end of the pumping beam combiner is connected with a pumping source, and the optical signal output end of the pumping beam combiner is connected with the input end of the gain fiber;
the output end of the gain optical fiber is connected with a transmission optical fiber;
all the transmission fibers are closely arranged to form a fiber array;
the output light rays of the optical fiber array are focused on the same focus by the zoom reflector;
the diffraction grating is positioned at the focus and is used for forming a spectrum composite beam;
the beam splitter divides the spectrum synthetic light beam into reflected light and transmitted light;
the reflected light is incident to a power meter or a target surface;
the transmission light is focused by a focusing lens and then is incident to the CCD;
the CCD is positioned at the focus of the focusing lens, is connected with the electric signal feedback end of the tunable filter, and is used for imaging the focused light beam and feeding imaging information back to the tunable filter.
Further, the reflectance of the beam splitter was 99.9%.
Further, the device also comprises a reflecting mirror; the reflecting mirror is positioned between the beam splitter and the focusing lens and used for reflecting the transmitted light to the focusing lens.
Further, the diffraction grating is a prism or a transmission grating or a reflection grating.
Further, the laser light source is a broad spectrum super-fluorescence light source.
The invention has the beneficial effects that:
1. the spectrum synthesis method and the device can realize the spectrum synthesis of dozens or even hundreds of paths in a limited space, overcome the degradation of light beam quality caused by external factors such as temperature, humidity, jitter and the like by establishing a real-time feedback control system, and ensure the action effect of the spectrum synthesis.
2. The invention also arranges a reflector between the beam splitter and the focusing lens, so that the space arrangement of each optical device is more reasonable, and the occupied space can be reduced.
Drawings
FIG. 1 is a schematic structural diagram of a spectrum synthesizer according to the present invention.
Description of the drawings:
the system comprises a 1-laser light source, a 2-beam splitter, a 3-tunable filter, a 4-pumping beam combiner, a 5-gain fiber, a 6-fiber array, a 7-zoom reflector, an 8-diffraction grating, a 9-spectrum synthesized beam, a 10-beam splitter, a 11-power meter, 12-transmitted light, a 13-reflector, a 14-focusing lens, a 15-CCD and a 17-pumping source.
Detailed Description
To make the objects, advantages and features of the present invention more apparent, a spectrum synthesis method and apparatus according to the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following detailed description. It should be noted that: the drawings are in simplified form and are not to precise scale, the intention being solely for the convenience and clarity of illustrating embodiments of the invention; second, the structures shown in the drawings are intended to be part of actual structures.
The working principle of the invention is as follows: the tunable technology is adopted to divide a wide-spectrum super-fluorescent light source, hundreds of seed laser divisions are realized, the output of a high-kilowatt narrow-linewidth optical fiber laser is realized through the adjustable filtering power amplifying component, then, the spectrum synthesis is realized through the diffraction grating and the dense optical fiber array, a part of light is used as reference light, the spectrum transformation is carried out through the front-section tunable technology, the establishment of the final feedback control is realized, and the final light beam quality is ensured.
A spectrum synthesizer is shown in figure 1, and comprises a laser light source 1, a beam splitter 2, an adjustable filtering power amplification component, a zoom reflector 7, a diffraction grating 8, a beam splitter 10, a reflector 13, a focusing lens 14 and a CCD 15 which are arranged in sequence;
the laser light source 1 is a wide-spectrum super-fluorescent light source which emits a wide-spectrum initial light source; the beam splitter 2 divides the initial light source into a plurality of paths of seed broad spectrum light sources; each seed broad spectrum light source is provided with an adjustable filtering power amplifying assembly; the adjustable filtering power amplification component comprises a tunable filter 3, a pumping beam combiner 4 and a gain fiber 5; the optical signal input end of the tunable filter 3 is used for receiving a seed broad spectrum light source; the optical signal input end of the pumping beam combiner 4 is connected with the optical signal output end of the tunable filter 3, the pumping end of the pumping beam combiner is connected with a pumping source 17, and the optical signal output end of the pumping beam combiner is connected with the input end of the gain fiber 5; the output end of the gain fiber 5 is connected with a transmission fiber.
All the transmission optical fibers are tightly arranged and clamped by an optical fiber array clamp to form an optical fiber array 6; the output light rays of the optical fiber array 6 are focused on the same focus by the zoom reflector 7; the diffraction grating 8 is positioned at the focus and is used for forming a spectrum composite light beam 9; the diffraction grating 8 is a prism or a transmission grating or a reflection grating. The beam splitter 10 splits the spectrally combined light beam 9 into reflected light and transmitted light 12; the reflectance of the beam splitter 10 is 99.9%; the split reflected light is incident to a power meter 11 or a target surface; the transmitted light 12 is reflected by a reflector 13, reaches a focusing lens 14, is focused by the focusing lens 14 and then enters a CCD 15; the CCD 15 is located at the focal point of the focusing lens 14, connected to the electric signal feedback end of the tunable filter 3, and configured to image the focused light beam and feed back imaging information to the tunable filter 3.
The working process of the spectrum synthesis device is as follows:
step 1) emergent light of the wide-spectrum super-fluorescent light source passes through a beam splitter 2 to realize tens or hundreds of seed wide-spectrum light sources;
step 2) arranging a tunable filter 3 on each path of seed broad-spectrum light source, and tuning the wavelength of the single-path seed broad-spectrum light source by the tunable filter 3 to form a narrow-linewidth light source; the tunable filter 3 can also be replaced by a space tuning device, is mainly used for realizing low-power single-path different spectrum output, and can adjust the spectrum of each path to realize subsequent feedback control;
step 3), single-path different-spectrum output light rays realize power amplification of a single-path narrow-linewidth light source through a pumping beam combiner 4 and a gain optical fiber 5, and the amplification power can reach thousands of watts;
step 4), densely arranging all the amplified different spectrums to form an optical fiber array 6 and outputting the optical fiber array;
step 5), the laser output by each path realizes the collimation and integral focusing of each path of light beam through a zoom reflector 7, so that all the light beams are focused at a focus;
step 6) placing a diffraction grating 8 at the position of the focus, wherein the diffraction grating 8 is a prism or a transmission grating or a reflection grating and the like, and adjusting the position relation between the light beam and the grating according to the diffraction angle of the grating so that the multi-path spectrum laser can form the optimal spectrum synthesized light beam 9 after passing through the diffraction grating 8;
step 7), enabling the spectrum synthesized light beam 9 to pass through a beam splitter 10 with the reflectivity of 99.9%, enabling most reflected light to irradiate a power meter 11 or a target surface, enabling a small part of transmitted light 12 to be focused by a focusing lens 14 through a reflecting mirror 13, placing a CCD 15 at the focus of the focusing lens 14, and displaying a synthesized effect on the CCD 15 by the spectrum synthesized light beam effect; the synthesis effect is transmitted to the tunable filter 3 through feedback control, and each path of input seed broad spectrum light source is adjusted in real time to achieve the optimal spectrum synthesis effect.
Claims (4)
1. A spectral synthesis apparatus, characterized by: the device comprises a laser light source (1), a beam splitter (2), an adjustable filtering power amplification component, a zoom reflector (7), a diffraction grating (8), a beam splitter (10), a focusing lens (14) and a CCD (15) which are arranged in sequence;
the laser light source (1) emits a wide-spectrum super-fluorescence light source;
the beam splitter (2) divides the broad-spectrum super-fluorescence light source into tens or hundreds of seed broad-spectrum light sources;
each path of seed broad spectrum light source is provided with an adjustable filtering power amplification assembly;
the adjustable filtering power amplification component comprises a tunable filter (3), a pumping beam combiner (4) and a gain optical fiber (5);
the optical signal input end of the tunable filter (3) is used for receiving the seed broad spectrum light source and tuning the wavelength of the single seed broad spectrum light source to form a narrow line width light source;
the optical signal input end of the pump beam combiner (4) is connected with the optical signal output end of the tunable filter (3), the pump end of the pump beam combiner is connected with a pump source (17), and the optical signal output end of the pump beam combiner is connected with the input end of the gain optical fiber (5); the output end of the gain optical fiber (5) is connected with a transmission optical fiber;
the pump beam combiner (4) and the gain fiber (5) realize power amplification of a single-path narrow-linewidth light source;
all the transmission fibers are closely arranged to form a fiber array (6);
the output light rays of the optical fiber array (6) are focused on the same focal point by a zoom reflector (7);
the diffraction grating (8) is located at the focal point for forming a spectrally combined light beam (9);
the beam splitter (10) splits the spectrally combined light beam (9) into reflected light and transmitted light (12);
the reflected light is incident to a power meter (11) or a target surface;
the transmission light (12) is focused by a focusing lens (14) and then enters a CCD (15);
the CCD (15) is located at the focus of the focusing lens (14), is connected with an electric signal feedback end of the tunable filter (3), and is used for imaging the focused light beam, feeding imaging information back to the tunable filter (3), and adjusting each path of input seed broad spectrum light source in real time to achieve the optimal spectrum synthesis effect.
2. A spectrum synthesizing apparatus according to claim 1, characterized in that:
the reflectivity of the beam splitter (10) is 99.9%.
3. A spectral synthesis apparatus according to claim 2, characterized in that:
further comprising a mirror (13); the reflecting mirror (13) is positioned between the beam splitter (10) and the focusing lens (14) and is used for reflecting the transmitted light (12) to the focusing lens (14).
4. A spectral synthesis apparatus according to claim 3, characterized in that:
the diffraction grating (8) is a transmission grating or a reflection grating.
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| CN112241069A (en) * | 2020-10-15 | 2021-01-19 | 上海无线电设备研究所 | Optical fiber laser synthesis system |
| CN113253472B (en) * | 2021-05-28 | 2021-11-09 | 武汉光谷航天三江激光产业技术研究院有限公司 | Reference light generating device and method for light beam synthesis system |
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