CN116093719A - Super-continuous light source based on random laser - Google Patents
Super-continuous light source based on random laser Download PDFInfo
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- CN116093719A CN116093719A CN202310056986.3A CN202310056986A CN116093719A CN 116093719 A CN116093719 A CN 116093719A CN 202310056986 A CN202310056986 A CN 202310056986A CN 116093719 A CN116093719 A CN 116093719A
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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
- H01S3/08018—Mode suppression
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Abstract
The invention provides a super-continuous light source based on random laser, which comprises a pumping source, a beam combiner, a gain optical fiber, a first long-distance single-mode communication optical fiber, a total output end and a random laser reflection module, wherein the first long-distance single-mode communication optical fiber is used for generating super-continuous spectrum optical fiber laser, the random laser reflection module is used for reducing the threshold value of the random laser, the output end of the pumping source and the output end of the random laser reflection module are connected with the input end of the beam combiner, and the output end of the beam combiner, the gain optical fiber, the first long-distance single-mode communication optical fiber and the total output end are sequentially connected; the super-continuum spectrum is generated based on the fiber random laser technology, the structure is simple and reliable, and the loss of a super-continuum spectrum light source in the fiber transmission process can be effectively avoided; the first long-distance single-mode communication optical fiber is used, so that the compatibility is good, and the beam quality is excellent; the laser threshold of random laser is reduced through the random laser reflection module, the super-continuous threshold is reduced, and the practicability is enhanced.
Description
Technical Field
The invention relates to the field of optical communication, in particular to a super-continuous light source based on random laser.
Background
The super-continuous light source has wide application in national defense and military, scientific research, optical detection and spectral analysis. However, most of the current mature supercontinuum schemes are based on ultra-fast pulse laser amplification, and short pulse laser with high peak power excites photonic crystal fibers to realize supercontinuum generation, so that the supercontinuum light source with the structure has high cost, poor photonic crystal fiber compatibility and low system operation efficiency; in addition, the super-continuous light source based on continuous light is driven into a photonic crystal fiber or a conventional single-mode fiber by high-power pump laser, and excitation super-continuous generation is started near a zero dispersion point of the fiber, so that the super-continuous light source with the structure has high generation threshold value and low practicability.
Disclosure of Invention
Aiming at the defects of high cost, poor compatibility of photonic crystal fibers, high supercontinuum threshold and low practicability of the supercontinuum light source in the prior art, the invention provides the supercontinuum light source based on random laser.
The invention discloses a super-continuous light source based on random laser, which comprises a pumping source, a beam combiner, a gain optical fiber, a first long-distance single-mode communication optical fiber, a total output end and a random laser reflection module, wherein the first long-distance single-mode communication optical fiber is used for generating super-continuous spectrum optical fiber laser, the random laser reflection module is used for reducing the lasing threshold of the random laser, the output end of the pumping source and the output end of the random laser reflection module are connected with the input end of the beam combiner, and the output end of the beam combiner, the gain optical fiber, the first long-distance single-mode communication optical fiber and the total output end are sequentially connected; the pump light of the pump source is input into the gain fiber through the beam combiner, the gain fiber generates signal light under the action of the pump light, the signal light is incident into the random laser reflection module through the beam combiner, the signal light reflected by the random laser reflection module and the pump light of the pump source are coupled into the gain fiber through the beam combiner, gain is provided by the gain fiber, the gain fiber is input into the first long-distance single-mode communication fiber, and the super-continuous spectrum fiber laser is generated in the first long-distance single-mode communication fiber through nonlinear effect and then output through the total output end.
Preferably, the random laser reflection module comprises an optical fiber coupler, the optical fiber coupler comprises a first port, a second port, a third port and a fourth port, the first port and the second port are positioned on one side of the optical fiber coupler far away from the beam combiner, the third port and the fourth port are positioned on one side of the optical fiber coupler close to the beam combiner, the first port and the second port are welded, and the third port is connected with the input end of the beam combiner.
Further, the random laser reflection module further comprises a second long-distance single-mode communication optical fiber, the second long-distance single-mode communication optical fiber is used for generating super-continuum spectrum optical fiber laser, and the third end, the second long-distance single-mode communication optical fiber and the input end of the beam combiner are sequentially connected.
Still further, the first long-distance single-mode communication optical fiber and the second long-distance single-mode communication optical fiber are both SMF28 optical fibers; the lengths of the first long-distance single-mode communication optical fiber and the second long-distance single-mode communication optical fiber are both more than or equal to 100m; the gain fiber is a single mode fiber.
Further, the optical fiber coupler is a 2×2 single mode optical fiber coupler, the first port and the second port are input ends of the optical fiber coupler, and the third port and the fourth port are output ends of the optical fiber coupler.
Preferably, the pump source is a semiconductor laser.
Preferably, the wavelength of the pump light output by the pump source is 976nm.
Preferably, the gain fiber is an ytterbium-doped fiber.
Compared with the prior art, the supercontinuum based on random laser generates the supercontinuum based on the fiber random laser technology, has a simple and reliable structure, a wider working wavelength range and stronger multiplexing capability, and can effectively avoid the loss of a supercontinuum light source in the fiber transmission process; the first long-distance single-mode communication optical fiber is used, so that the compatibility is good, and the beam quality is excellent; the laser threshold of random laser is reduced through the random laser reflection module, the super-continuous threshold is reduced, and the practicability is enhanced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a super-continuous light source based on random laser according to an embodiment of the invention.
Fig. 2 is a schematic structural diagram of a super-continuous light source based on random laser according to another embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a super-continuous light source based on random laser according to another embodiment of the present invention.
FIG. 4 is a graph showing the output of a spectrometer with a random laser-based supercontinuum light source according to an embodiment of the present invention.
Description of the embodiments
For a further understanding of the objects, construction, features, and functions of the invention, reference should be made to the following detailed description of the preferred embodiments.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Referring to fig. 1, the super-continuous light source based on random laser of the present invention includes a pump source 1, a beam combiner 2, a gain fiber 3, a first long-distance single-mode communication fiber 4, a total output end 5 and a random laser reflection module 6.
The pump source 1 is used for outputting pump light, the beam combiner 2 is used for coupling the pump light of the pump source 1 and signal light generated by the gain optical fiber 3 and reflected by the random laser reflection module 6 into the gain optical fiber 3, the gain optical fiber 3 is used for providing gain for random laser, the first long-distance single-mode communication optical fiber 4 is used for generating super-continuum spectrum fiber laser, and the random laser reflection module 6 is used for reducing the lasing threshold of the random laser.
The output end of the pump source 1 and the output end of the random laser reflection module 6 are connected with the input end of the beam combiner 2, and the output end of the beam combiner 2, the gain optical fiber 3, the first long-distance single-mode communication optical fiber 4 and the total output end 5 are sequentially connected.
The pump light of the pump source 1 is input into the gain optical fiber 3 through the beam combiner 2, the gain optical fiber 3 generates signal light under the action of the pump light, the signal light is incident into the random laser reflection module 6 through the beam combiner 2, the signal light reflected by the random laser reflection module 6 and the pump light of the pump source 1 are coupled into the gain optical fiber 3 through the beam combiner 2, gain is provided by the gain optical fiber 3, the gain optical fiber is input into the first long-distance single-mode communication optical fiber 4, and the supercontinuum optical fiber laser is generated in the first long-distance single-mode communication optical fiber 4 through nonlinear effect and then output through the total output end 5.
The super-continuous light source generates a super-continuous spectrum based on the fiber random laser technology, has a simple and reliable structure, a wider working wavelength range and stronger multiplexing capability, and can effectively avoid the loss of the super-continuous spectrum light source in the fiber transmission process; the first long-distance single-mode communication optical fiber 4 is used, so that the compatibility is good, and the beam quality is excellent; the laser threshold of the random laser is reduced through the random laser reflection module 6, the super-continuous threshold is reduced, and the practicability is improved.
In practical use, the pump source 1 is generally a semiconductor laser with optical fiber output; the wavelength of the pump light outputted from the pump source 1 is 976nm, 915nm, etc., and the wavelength of the pump light outputted from the pump source 1 is preferably 976nm in view of absorption efficiency; the gain fiber 3 is preferably an ytterbium-doped fiber.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a super-continuous light source based on random laser according to another embodiment of the present invention, compared with the embodiment in fig. 1, in this embodiment, the random laser reflection module 6 includes an optical fiber coupler 61, the optical fiber coupler 61 includes a first port 611, a second port 612, a third port 613 and a fourth port 614, the first port 611 and the second port 612 are located at a side of the optical fiber coupler 61 far from the beam combiner 2, the third port 613 and the fourth port 614 are located at a side of the optical fiber coupler 61 near the beam combiner 2, the first port 611 and the second port 612 are welded, and the third port 613 is connected with an input end of the beam combiner 2.
By fusion bonding the first port 611 and the second port 612, the fiber coupler 61 can be used as a broadband reflector, providing feedback to the system, lowering the random laser threshold.
In practical use, the optical fiber coupler 61 may be a 2×2 single-mode optical fiber coupler, the first port 611 and the second port 612 are input ends of the optical fiber coupler 61, and the third port 613 and the fourth port 614 are output ends of the optical fiber coupler 61; when the first port 611 and the second port 612 are fused and used as a broadband reflector, the third port 613 is an input end and an output end of the broadband reflector, and the third port 613 is configured to receive the signal light from the gain fiber 3 and output the signal light after reflection.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a supercontinuum light source based on random laser according to still another embodiment of the present invention, and compared with the embodiment in fig. 2, the random laser reflection module 6 further includes a second long-distance single-mode communication optical fiber 62, the second long-distance single-mode communication optical fiber 62 is used for generating supercontinuum fiber laser, and the third end 613, the second long-distance single-mode communication optical fiber 62, and the input end of the beam combiner 2 are sequentially connected.
The pump light of the pump source 1 is input into the gain optical fiber 3, so that the gain optical fiber 3 generates signal light, and the signal light is sequentially input into the second long-distance single-mode communication optical fiber 62 and the third port 613 of the optical fiber coupler 61 through the beam combiner 2, so that laser radiation is formed under the reflection of the third port 613 and the random feedback of the second long-distance single-mode communication optical fiber 62.
To reduce cost, the first long-range single-mode communication fiber 4 and the second long-range single-mode communication fiber 62 are SMF28 fibers, which can provide rayleigh scattering on one hand, feedback for random laser light, and nonlinear effects on the other hand, resulting in raman shift and broadening processes.
In order to ensure the spectral width of the super-continuum light source, the lengths of the first long-distance single-mode communication optical fiber 4 and the second long-distance single-mode communication optical fiber 62 are equal to or greater than 100m.
Preferably, the gain fiber 3 is a single-mode fiber, and adopts a full-mode fiber structure, so that the compatibility is good, and the beam quality is excellent.
The following embodiments of the present invention are described with reference to the structure of fig. 3:
the pumping source 1 is a semiconductor pumping laser output by an optical fiber, the power is 9W, and the wavelength is 976nm; the beam combiner 2 is a (2+1) x 1 pump coupler; the gain optical fiber 3 is a 4M long non-polarization-maintaining ytterbium-doped optical fiber, and the model of the optical fiber is LMA-YDF-10/130-M; the first long-range single-mode communication fiber 4 and the second long-range single-mode communication fiber 62 are each 150m long SMF28 fibers to provide random distributed feedback and nonlinear gain based on rayleigh scattering; the optical fiber coupler 61 is a 1064nm1:1 non-polarization maintaining coupler, one end of the optical fiber coupler 61 is welded and used as a broadband reflector, feedback is provided for the system, and the random laser threshold is reduced.
The working principle of the embodiment is as follows: the 976nm pump source 1 provides excitation, pump laser is input into the gain optical fiber 3 after passing through the beam combiner 2, ytterbium ions in the gain optical fiber 3 are transited to an upper energy level to form a particle number inversion state under pumping of the pump laser, the particles at the upper energy level spontaneously transit to a lower energy level and radiate photons, the radiated photons excite more photons under the mirror feedback provided by the optical fiber coupler 61 and the random feedback provided by the second long-distance single-mode communication optical fiber 62 through Rayleigh scattering to form laser radiation, the wave band of the laser radiation covers 1000-1100nm, 1060nm near a gain peak is in competitive advantage along with higher pump power, the generation of the random laser can be expressed as output of pulse light in the time domain due to instability and random feedback of mode competition, the laser with high peak power is excited in the second long-distance single-mode communication optical fiber 62 and the first long-distance single-mode communication optical fiber 4 to be stimulated to scatter, the wavelength is rapidly expanded from 1 micron to more than 1.3 microns, and when the wavelength of the output reaches a zero-wavelength point, the laser with high wavelength reaches the zero-dispersion continuously.
The total output end 5 is connected with a spectrometer, the output result is shown in fig. 4, the horizontal axis is wavelength, the vertical axis is power, the power output is 50MW, the power output is limited by the testing range of the spectrometer, the spectrum range only covers 600-2000nm, the working wavelength range is wide, and the application requirement is completely met.
The super-continuous light source based on random laser generates a super-continuous spectrum based on the fiber random laser technology, has a simple and reliable structure, a wider working wavelength range and stronger multiplexing capability, and can effectively avoid the loss of the super-continuous spectrum light source in the fiber transmission process; the first long-distance single-mode communication optical fiber is used, so that the compatibility is good, and the beam quality is excellent; the laser threshold of random laser is reduced through the random laser reflection module, the super-continuous threshold is reduced, and the practicability is enhanced.
The invention has been described with respect to the above-described embodiments, however, the above-described embodiments are merely examples of practicing the invention. In addition, the technical features described above in the different embodiments of the present invention may be combined with each other as long as they do not collide with each other. It should be noted that the disclosed embodiments do not limit the scope of the invention. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (10)
1. The super-continuous light source based on random laser is characterized by comprising a pumping source, a beam combiner, a gain optical fiber, a first long-distance single-mode communication optical fiber, a total output end and a random laser reflection module, wherein the first long-distance single-mode communication optical fiber is used for generating super-continuous spectrum optical fiber laser, the random laser reflection module is used for reducing the lasing threshold of the random laser, the output end of the pumping source and the output end of the random laser reflection module are connected with the input end of the beam combiner, and the output end of the beam combiner, the gain optical fiber, the first long-distance single-mode communication optical fiber and the total output end are sequentially connected;
the pump light of the pump source is input into the gain optical fiber through the beam combiner, the gain optical fiber generates signal light under the action of the pump light, the signal light is incident into the random laser reflection module through the beam combiner, the signal light reflected by the random laser reflection module and the pump light of the pump source are coupled into the gain optical fiber through the beam combiner, gain is provided by the gain optical fiber, the gain optical fiber is input into the first long-distance single-mode communication optical fiber, and the super-continuous spectrum optical fiber laser is generated in the first long-distance single-mode communication optical fiber through nonlinear effect and then output through the total output end.
2. The random laser based supercontinuum light source of claim 1, wherein said random laser reflection module comprises an optical fiber coupler, said optical fiber coupler comprising a first port, a second port, a third port and a fourth port, said first port and said second port being located on a side of said optical fiber coupler away from said combiner, said third port and said fourth port being located on a side of said optical fiber coupler near said combiner, said first port and said second port being fused, said third port being connected to an input of said combiner.
3. The random laser-based supercontinuum light source of claim 2, wherein the random laser reflection module further comprises a second long-distance single-mode communication fiber, the second long-distance single-mode communication fiber is used for generating supercontinuum fiber laser, and the third end, the second long-distance single-mode communication fiber and the input end of the beam combiner are sequentially connected.
4. The random laser based supercontinuum light source of claim 2, wherein said fiber coupler is a 2 x 2 single mode fiber coupler, said first port and said second port are inputs of said fiber coupler, and said third port and said fourth port are outputs of said fiber coupler.
5. A random laser based supercontinuum light source as in claim 3 wherein said first long-range single-mode communication fiber and said second long-range single-mode communication fiber are SMF28 fibers.
6. A random laser based supercontinuum light source as in claim 3 wherein said first long-distance single-mode communication fiber and said second long-distance single-mode communication fiber are each greater than or equal to 100m in length.
7. A random laser based supercontinuum light source as in claim 3 wherein said gain fiber is a single mode fiber.
8. A random laser based supercontinuum light source as in claim 1 wherein said pump source is a semiconductor laser.
9. A random laser based supercontinuum light source as in claim 1 wherein said pump source outputs pump light having a wavelength of 976nm.
10. A random laser based supercontinuum light source as in claim 1 wherein said gain fiber is an ytterbium doped fiber.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310056986.3A CN116093719A (en) | 2023-01-18 | 2023-01-18 | Super-continuous light source based on random laser |
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| CN202310056986.3A CN116093719A (en) | 2023-01-18 | 2023-01-18 | Super-continuous light source based on random laser |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116845677A (en) * | 2023-07-03 | 2023-10-03 | 中国人民解放军国防科技大学 | Monopole high-power supercontinuum light source based on random distributed feedback |
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2023
- 2023-01-18 CN CN202310056986.3A patent/CN116093719A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116845677A (en) * | 2023-07-03 | 2023-10-03 | 中国人民解放军国防科技大学 | Monopole high-power supercontinuum light source based on random distributed feedback |
| CN116845677B (en) * | 2023-07-03 | 2024-01-26 | 中国人民解放军国防科技大学 | Single-stage high-power supercontinuum light source based on random distributed feedback |
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