CN210866766U - High-precision and high-efficiency optical fiber laser - Google Patents
High-precision and high-efficiency optical fiber laser Download PDFInfo
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- CN210866766U CN210866766U CN201921621078.XU CN201921621078U CN210866766U CN 210866766 U CN210866766 U CN 210866766U CN 201921621078 U CN201921621078 U CN 201921621078U CN 210866766 U CN210866766 U CN 210866766U
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Abstract
A high-precision and high-efficiency optical fiber laser comprises a pumping source, a working substance and a resonant cavity; the resonant cavity is an annular resonant cavity and is formed by connecting working substances end to end; the resonant cavity also comprises a gain optical fiber, a coupler, a mode locking modulator and an isolator; the gain optical fiber, the coupler, the mode locking modulator and the isolator are sequentially connected through working substances; and pumping light emitted by the pumping source enters the gain fiber under the light action of the pumping source, and the gain fiber is a rare earth element doped fiber. High accuracy efficient fiber laser, utilize the mode locking technique to realize ultrashort pulse laser output, realize the mode locking through inserting the mode locking modulator in fiber laser, pulse width is narrow, the high accuracy, the high efficiency, application prospect is extensive.
Description
Technical Field
The utility model relates to a fiber laser technical field, concretely relates to high accuracy efficient fiber laser.
Background
In the 70 s of the 20 th century, corning incorporated manufactured the first fiber in the world with attenuation less than 20dB/km, based on the high roll concept of chemical vapor deposition, which breaks through the limit of glass fiber in loss.
The development success and the continuous optimization of the performance of the optical fiber also promote the continuous development of the laser. Optical fibers have many advantages as gain media for lasers. One is as follows: the fiber core of the slender fiber structure of the optical fiber is usually less than 10pm, so that the area-volume ratio of the optical fiber laser is large, the heat dissipation effect is good, the conversion efficiency between optical fibers is high, and the optical fiber laser is suitable for long-time transmission of high-power laser pulses; the second step is as follows: because the laser pulse is transmitted in the optical fiber, the interference of the environment to the pulse transmission is small; and thirdly: er doping3+The gain bandwidth of the optical fiber can reach 10nm, and the pulse width can reach 20fs, so that the optical fiber transmission has large gain bandwidth and ultrashort pulse width; fourthly, the method comprises the following steps: the optical fiber has flexibility, nonlinearity and abundant dispersion characteristics, so that the optical fiber laser has a plurality of mode locking mechanisms and different cavity structures, and the system integration and packaging are facilitated.
Based on the development of the optical fiber and the advantages of the optical fiber as a transmission medium of a laser system, the research on the basic subjects of biology, chemistry, physics, etc. of the fiber laser in the present day, and the success of the scientific research make internal disorder or usurp fields of micro-nano industry, ultra-precise medical surgery, medical imaging, etc. are attracting attention.
However, with the rapid development of science and technology, the fiber laser is continuously improved, and the fiber laser needs to overcome the defects of high price, severe environmental requirements, poor stability and the like of the laser, and needs to improve the precision and the efficiency towards the development of practicability evolution so as to meet various requirements.
Chinese patent application No. CN201120133925.5 discloses an all-fiber Q-switched fiber laser, which includes a pump laser light source, a pump laser signal laser beam combiner, a fiber grating first cavity mirror, a fiber laser gain medium, and an output fiber grating second cavity mirror, and has the innovative point that a Q-switched switch is arranged in the all-fiber laser cavity, the Q-switched switch is an electro-optical switch that directly drives fiber coupling by using pulse voltage of 5 to 200 volts, and the improvement of precision and efficiency is very limited.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: in order to overcome not enough above, the utility model aims at providing a high accuracy efficient fiber laser, simple structure, it is with low costs, utilize the mode locking technique to realize ultrashort pulse laser output, realize the mode locking through inserting the mode locking modulator in fiber laser, pulse width is narrow, the high accuracy, and is high-efficient, and application prospect is extensive.
The technical scheme is as follows: a high-precision and high-efficiency optical fiber laser comprises a pumping source, a working substance and a resonant cavity; the resonant cavity is an annular resonant cavity and is formed by connecting working substances end to end; the resonant cavity also comprises a gain optical fiber, a coupler, a mode locking modulator and an isolator; the gain optical fiber, the coupler, the mode locking modulator and the isolator are sequentially connected through working substances; and pumping light emitted by the pumping source enters the gain fiber under the light action of the pumping source, and the gain fiber is a rare earth element doped fiber.
High accuracy efficient fiber laser, utilize the mode locking technique to realize ultrashort pulse laser output, realize the mode locking through inserting the mode locking modulator in fiber laser for it equals with the fundamental frequency size, light signal process modulator this moment, the intracavity loss of resonance can periodic modulation light signal's amplitude. Because the place with small loss passes through the modulator, the corresponding loss state is still small, and through repeated multiple periodic cycles, the amplitude corresponding to the peak position of the optical signal is continuously strengthened, the loss corresponding to the two ends is continuously attenuated to be small, the width is also continuously compressed, and finally, the pulse peak power formed by active mode locking is high, the pulse width is narrow, and the high precision and the high efficiency are realized.
The working principle is as follows: pumping light emitted by a pumping source enters a gain optical fiber under the action of the light of the pumping source, and the gain medium is a rare earth element doped optical fiber, so that the pumping light is absorbed, rare earth ions absorbing photon energy generate energy level transition and realize population inversion, and the inverted particles pass through a coupler of a resonant cavity and are transited from an excited state to a ground state, the energy is released, and stable laser output is formed. Wherein, the mode locking is realized by the modulator, and the interference is isolated by the isolator.
Resonant cavity, resonant cavity structure be the annular, simple structure, be about for optic fibre end to end can, consequently do not need the dielectric mirror, can form full fiber cavity, output pulse stability is good, be convenient for adjust, can realize the pulse quality high quality of self-starting and output.
Further, in the high-precision and high-efficiency fiber laser, the working substance is a double-clad fiber, and the double-clad fiber comprises a fiber core and an outer layer.
The working substance be double-clad optic fibre, the fibre core comprises the quartz material who mixes elements such as ytterbium ion, as laser oscillation passageway, and outer by transverse dimension and numerical aperture than the big many of fibre core, the refractive index constitutes than the pure quartz material that the fibre core is little. The quartz material has better performance than common glass, is doped with high-radiation-resistant ions such as ytterbium, can bear laser energy of 10,000W without thermal damage, adopts D-type structures and the like, has small optical rotation effect and sufficient absorption, and converts light and light by more than 80%.
Further, in the above high-precision and high-efficiency fiber laser, a wavelength division multiplexer is further included in the resonant cavity, and the wavelength division multiplexer is disposed on the working substance and located between the pump source and the gain fiber.
The pumping light emitted by the pumping source firstly passes through the wavelength division multiplexer and then enters the gain optical fiber, the wavelength division multiplexer can improve the communication capacity, the bandwidth of the optical fiber is fully utilized, and the optical fiber gain amplifier has the advantages of simple capacity expansion, reliable performance and the like.
Further, in the above high-precision and high-efficiency fiber laser, the resonator further includes a filter disposed on the working substance and located between the gain fiber and the coupler.
A filter is arranged between the gain optical fiber and the coupler and serves as a multi-channel comb filter, the wavelength can be adjusted, the cost is low, and a stable transmission spectrum can be output.
Further, in the above high-precision and high-efficiency fiber laser, the gain fiber is an erbium-doped rare earth element-doped fiber in the 1550nm band.
The gain fiber amplifies the output pulse signal, the physical characteristics of which are determined by the host material, and the energy level structure of the doped ions determines the properties of the output spectrum. The gain fiber of the fiber laser is generally a section of doped fiber, and the doped fiber is mainly doped with rare earth ions into the fiber core with certain distribution and concentration. High accuracy efficient fiber laser, utilize the mode locking technique to realize ultrashort pulse laser output, select near 1550nm wave band near erbium (Er) of mixing3+) Erbium ion is used as an important rare earth ion, is used as a laser gain medium, and has the advantages of high pumping power, narrow mode-locking pulse width, large gain bandwidth, small thermal effect and the like.
Further, in the high-precision and high-efficiency fiber laser, the mode-locking modulator is a lithium niobate modulator.
Because electro-optical and acousto-optic modulator volume and coupling loss are all bigger, and lithium niobate modulator is small, closes the loss and is low, can integrate the intracavity to optic fibre, the modulation bandwidth of lithium niobate modulator is also bigger simultaneously, consequently the modulator be lithium niobate modulator.
Further, in the high-precision and high-efficiency fiber laser, the pump source is a semiconductor laser with a 976nm waveband.
The pump source is a semiconductor laser with a 976nm waveband, the light-light conversion efficiency of the pump source can reach 85%, and the pump source has higher absorption efficiency, shorter gain active optical fiber length and lower optical fiber nonlinear effect, and also saves part of material cost.
The utility model has the advantages that:
(1) the structure is simple, ultrashort pulse laser output is realized by using a mode locking technology, mode locking is realized by inserting a mode locking modulator into an optical fiber laser, the loss in a resonant cavity can periodically modulate the amplitude of an optical signal through the modulator, the amplitude corresponding to the peak position of the optical signal is continuously enhanced through repeated multiple periodic cycles, the loss corresponding to two ends is continuously attenuated and is small, the width is continuously compressed, and finally, the pulse peak power formed by active mode locking is high, the pulse width is narrow, the high-precision high-efficiency pulse width is narrow, the high precision is high, and the high efficiency is high;
(2) the needle resonant cavity is annular in structure and simple in structure, namely the optical fibers are connected end to end, so that an all-fiber cavity can be formed without a dielectric mirror, the output pulse stability is good, the adjustment is convenient, and the self-starting and the output pulse quality are high;
(3) the working substance is double-clad optical fiber, the fiber core is made of quartz material doped with ytterbium ion and other elements, the outer layer is made of pure quartz material with transverse size and numerical aperture larger than the fiber core and refractive index smaller than the fiber core, the performance is better than that of common glass, the double-clad optical fiber can bear laser energy of 10,000W without thermal damage, the double-clad optical fiber adopts D-type and other structures, the optical rotation effect is small, the absorption is sufficient, and the light-light conversion is more than 80%;
(4) the wavelength division multiplexer can improve the communication capacity, fully utilizes the bandwidth of the optical fiber, and has simple capacity expansion and reliable performance; the filter is used as a multi-channel comb filter, can adjust the wavelength, has low cost and can output stable transmission spectrum;
(5) the gain fiber is erbium-doped rare earth element-doped fiber near 1550nm band and has the advantages of high pumping power, narrow mode-locked pulse width, large gain bandwidth, small heat effect and the like.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a high-precision and high-efficiency fiber laser according to the present invention;
in the figure: the device comprises a pumping source 1, a working substance 2, a resonant cavity 3, a gain fiber 31, a coupler 32, a mode-locking modulator 33, an isolator 34, a wavelength division multiplexer 35, a filter 36, an output end a and a radio frequency signal b.
Detailed Description
The invention will be further elucidated with reference to fig. 1 and an exemplary embodiment.
The high-precision and high-efficiency optical fiber laser with the structure shown in fig. 1 comprises a pumping source 1, a working substance 2 and a resonant cavity 3; the resonant cavity 3 is an annular resonant cavity and is formed by connecting the head and the tail of the working substance 2; the resonant cavity 3 also comprises a gain fiber 31, a coupler 32, a mode locking modulator 33 and an isolator 34; the gain fiber 31, the coupler 32, the mode locking modulator 33 and the isolator 34 are connected in sequence through the working substance 2; the pumping light emitted by the pumping source 1 enters the gain fiber 31 under the action of the light of the pumping source 1, and the gain fiber is a rare earth element doped fiber.
In addition, the working substance 2 is a double-clad optical fiber which comprises a fiber core and an outer layer.
Wherein, the resonant cavity 3 further comprises a wavelength division multiplexer 35, the wavelength division multiplexer 35 is disposed on the working substance 2 and is located between the pump source 1 and the gain fiber 31.
In addition, a filter 36 is further included in the resonant cavity 3, and the filter 36 is disposed on the working substance 2 and between the gain fiber 31 and the coupler 32.
Further, the gain fiber 31 is an erbium-doped rare-earth-doped fiber in the band around 1550 nm.
Further, the mode-locked modulator 33 is a lithium niobate modulator.
Further, the pump source 1 is a semiconductor laser with a 976nm waveband.
Examples
Based on the above structural basis, as shown in fig. 1.
High accuracy efficient fiber laser, by the pumping light that pumping source 1 sent, under pumping source 1's light effect, earlier through wavelength division multiplexer 35, wavelength division multiplexer can improve communication capacity, make full use of the bandwidth of optic fibre, it has moreover the dilatation a great deal of advantage such as simple and dependable performance.
Then enters the gain fiber 31, because the gain fiber 31 is doped with erbium (Er) near 1550nm band3+) The rare-earth element doped optical fiber uses erbium ion as an important rare-earth ion, which is used as a laser gain medium and has a pumpHigh pump power, narrow mode-locked pulse width, large gain bandwidth, and small thermal effect.
Therefore, the pumping light is absorbed, the rare earth ions absorbing the photon energy generate energy level transition and realize population inversion, the inverted particles pass through the coupler 32 of the resonant cavity, the excited state is transited back to the ground state, the energy is released, and stable laser is formed and output from the output end a. The mode-locked modulator 33 realizes mode-locked modulation through a radio-frequency signal b, the isolator 34 is used for isolating interference, the filter 36 is arranged between the gain fiber 31 and the coupler 32, and the filter 36 is used as a multi-channel comb filter, so that the wavelength can be adjusted, the cost is low, and a stable transmission spectrum can be output.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the details of the above embodiments, and the technical concept of the present invention can be within the scope of the present invention to perform various simple modifications to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and in order to avoid unnecessary repetition, the present invention does not need to describe any combination of the features.
In addition, the embodiments of the present invention can be arbitrarily combined with each other, and the same shall be regarded as the disclosure of the present invention as long as the idea of the present invention is not violated.
Claims (7)
1. A high-precision and high-efficiency optical fiber laser is characterized by comprising a pumping source (1), a working substance (2) and a resonant cavity (3); the resonant cavity (3) is an annular resonant cavity and is formed by connecting the head and the tail of the working substance (2); the resonant cavity (3) also comprises a gain fiber (31), a coupler (32), a mode locking modulator (33) and an isolator (34); the gain fiber (31), the coupler (32), the mode locking modulator (33) and the isolator (34) are sequentially connected through the working substance (2); the pumping light emitted by the pumping source (1) enters the gain fiber (31) under the light action of the pumping source (1), and the gain fiber is a rare earth element doped fiber.
2. The high precision high efficiency fiber laser according to claim 1, wherein the working substance (2) is a double clad fiber comprising a core, an outer layer.
3. A high precision high efficiency fiber laser according to claim 2, characterized in that the resonant cavity (3) further comprises a wavelength division multiplexer (35), the wavelength division multiplexer (35) being arranged on the working substance (2) and located between the pump source (1) and the gain fiber (31).
4. A high precision high efficiency fiber laser according to claim 1, characterized in that the resonant cavity (3) further comprises a filter (36), said filter (36) being arranged on the working substance (2) and between the gain fiber (31) and the coupler (32).
5. The high precision high efficiency fiber laser according to claim 1, characterized in that the gain fiber (31) is a rare earth doped fiber doped with erbium in the 1550nm band.
6. The high precision high efficiency fiber laser according to claim 4, characterized in that the mode-locked modulator (33) is a lithium niobate modulator.
7. A high precision and high efficiency fiber laser as claimed in claim 2, characterized in that the pump source (1) is a semiconductor laser of 976nm band.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921621078.XU CN210866766U (en) | 2019-09-27 | 2019-09-27 | High-precision and high-efficiency optical fiber laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921621078.XU CN210866766U (en) | 2019-09-27 | 2019-09-27 | High-precision and high-efficiency optical fiber laser |
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| Publication Number | Publication Date |
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| CN210866766U true CN210866766U (en) | 2020-06-26 |
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| CN201921621078.XU Expired - Fee Related CN210866766U (en) | 2019-09-27 | 2019-09-27 | High-precision and high-efficiency optical fiber laser |
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- 2019-09-27 CN CN201921621078.XU patent/CN210866766U/en not_active Expired - Fee Related
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Granted publication date: 20200626 Termination date: 20210927 |