CN115579718B - High-power dual-wavelength random distribution feedback Raman fiber laser - Google Patents

High-power dual-wavelength random distribution feedback Raman fiber laser Download PDF

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CN115579718B
CN115579718B CN202211576139.1A CN202211576139A CN115579718B CN 115579718 B CN115579718 B CN 115579718B CN 202211576139 A CN202211576139 A CN 202211576139A CN 115579718 B CN115579718 B CN 115579718B
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fiber
laser
wavelength
raman
source
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CN115579718A (en
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姚天甫
李阳
范晨晨
郝修路
张扬
马小雅
许将明
冷进勇
肖虎
刘伟
周朴
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National University of Defense Technology
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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
    • 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
    • H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
    • 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
    • H01S3/08086—Multiple-wavelength emission
    • H01S3/0809—Two-wavelenghth emission
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
    • Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation

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Abstract

The application relates to a high-power dual-wavelength random distribution feedback Raman fiber laser. The laser includes: the device comprises a pumping source, a wavelength division multiplexer, an acoustic fiber grating, a fiber high-reflection mirror, a Raman fiber and an end cap; one end of the wavelength division multiplexer is connected with the pumping source and the optical fiber high-reflection mirror; the output arm of the wavelength division multiplexer is connected with the acousto-optic fiber grating; the output end of the acoustic fiber bragg grating is connected with one end of the Raman fiber; the other end of the Raman fiber is connected with the end cap, and random fiber laser is output through the end cap; the acousto-optic fiber grating consists of a radio frequency signal source, piezoelectric ceramics and few-mode optical fibers with coating layers stripped, and is used for adjusting a signal light mode at a high-reflectivity end so as to adjust and control an output spectrum. The laser can output high-stability dual-wavelength laser.

Description

High-power dual-wavelength random distribution feedback Raman fiber laser
Technical Field
The application relates to the technical field of fiber lasers, in particular to a high-power dual-wavelength random distribution feedback Raman fiber laser.
Background
The dual-wavelength fiber laser is widely applied in the fields of terahertz generation, optical sensing, biomedical treatment and the like.
Currently, dual wavelength lasers based on ytterbium-doped, erbium-doped, and thulium-doped fibers have been widely reported, which can provide high gain over a wide range of wavelengths. However, there is inevitably strong mode competition and mode hopping in the uniformly broadened gain medium, causing increased laser instability.
Disclosure of Invention
In view of the above, it is necessary to provide a high-power dual-wavelength random-distribution-feedback raman fiber laser capable of outputting a high-stability dual-wavelength laser.
A high power dual wavelength randomly distributed feedback raman fiber laser, the laser comprising: the device comprises a pumping source, a wavelength division multiplexer, an acoustic fiber grating, a fiber high-reflection mirror, a Raman fiber and an end cap; the input end of the wavelength division multiplexer is connected with the pumping source, and the other end of the same side is connected with the optical fiber high-reflection mirror; the output arm of the wavelength division multiplexer is connected with the acousto-optic fiber grating; the output end of the acoustic fiber bragg grating is connected with one end of the Raman fiber; the other end of the Raman fiber is connected with the end cap, and random fiber laser is output through the end cap; the acousto-optic fiber grating consists of a radio frequency signal source, piezoelectric ceramics and few-mode optical fibers with coating layers stripped, and is used for adjusting a signal light mode and spectrum regulation.
In one embodiment, the radio frequency signal source comprises a signal generator and a voltage amplifier; one end of the voltage amplifier is connected with the signal generator, and the other end of the voltage amplifier is connected with the piezoelectric ceramic; the few-mode fiber is a step-index fiber.
In one embodiment, the signal generator is used for providing a sinusoidal signal with a specific frequency and amplitude; the voltage amplifier is used for amplifying the sinusoidal signal by 50 times.
In one embodiment, the pump source is a broadband amplified spontaneous emission light source or a high-power non-narrow linewidth laser with a two-stage amplifier, and comprises a seed source, a first-stage amplifier and a second-stage amplifier; the secondary amplifier comprises a laser diode array, a pumping signal beam combiner and a gain optical fiber; the seed source is a broadband light source in any wavelength range or a laser with any non-narrow line width, and the wavelength of the pumping source signal light is located in a Raman gain spectrum corresponding to the wavelength of the pumping source.
In one embodiment, the raman fiber is a graded index fiber; the raman gain coefficient of a region in which a fundamental mode is located in the core of the graded-index fiber is higher than that of a higher-order mode.
In one embodiment, a high-power isolator or circulator is added between the pump source and the wavelength division multiplexer for isolating backward return optical damage and protecting the pump source.
In one embodiment, the two-stage amplifier, the wavelength division multiplexer and the circulator are arranged on a water-cooling plate.
In one embodiment, the fiber high-reflection mirror is a broadband fiber high-reflection mirror; the connecting optical fiber of the broadband optical fiber high-reflection mirror is a single-mode optical fiber, and the reflectivity in the wavelength range of 1-2 microns is greater than 99.5%.
In one embodiment, the pigtail of the end cap is a graded index fiber; the gradient direction, gradient rate, fiber core size, refractive index value and refractive index distribution of the graded-index optical fiber are the same; the end caps are plated with antireflection films corresponding to the output signal light wavelengths.
In one embodiment, the pump source is replaced with a non-narrow linewidth fiber oscillator.
The laser is provided with a pumping source, a wavelength division multiplexer, an acousto-optic fiber grating, an optical fiber high-reflection mirror, a Raman optical fiber and an end cap; the input end of the wavelength division multiplexer is connected with the pumping source, and the other end of the same side is connected with the optical fiber high-reflection mirror; the output arm of the wavelength division multiplexer is connected with the acousto-optic fiber grating; the output end of the acoustic fiber bragg grating is connected with one end of the Raman fiber; the other end of the Raman fiber is connected with the end cap, and random fiber laser is output through the end cap; the acousto-optic fiber grating consists of a radio frequency signal source, piezoelectric ceramics and few-mode optical fibers with coating layers removed, and the frequency and amplitude of the radio frequency signal are adjusted to convert a fundamental mode LP01 mode with a certain wavelength into a high-order mode LP11 mode at a high-reflectivity end, so that the gain of Raman light with the wavelength is reduced, a pit is formed on a spectrum, and finally the output of dual-wavelength random Raman laser is realized.
Compared with the prior art, the invention has the advantages that: the invention realizes the regulation and control of the output wavelength through mode competition at different wavelengths in the optical fiber, adopts an all-fiber structure, can switch the output wavelength between single wavelength and dual wavelength, has switching speed lower than 1ms and has high response speed. The invention adopts a random distribution feedback Raman fiber laser structure, and compared with the traditional resonant cavity laser, the structure is simpler, the time sequence stability is better, and the output dual-wavelength is stable. Compared with the existing continuous wave dual-wavelength laser, the invention provides dual-wavelength laser output based on mode competition for the first time, and has obvious power improvement and obvious technical progress.
Drawings
FIG. 1 is a schematic diagram of the structural composition of a high power dual wavelength random distributed feedback Raman fiber laser in one embodiment;
FIG. 2 is a schematic diagram of the structure of a laser in which the pump source is replaced by a non-narrow linewidth fiber oscillator according to an embodiment;
FIG. 3 is a schematic diagram of an exemplary embodiment of an acousto-optic fiber grating and a driving RF signal source;
FIG. 4 is a graph of frequency versus wavelength for an acousto-optic fiber grating loading signal in one embodiment;
FIG. 5 is a schematic view of another embodiment of a graded-index Raman fiber refractive index profile;
FIG. 6 is a schematic diagram of a single wavelength laser spectrum output for a laser according to the present application in one embodiment;
FIG. 7 is a schematic diagram of an embodiment of a laser for outputting a dual wavelength laser spectrum;
FIG. 8 is a graph of laser output power versus pump power for one embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, as shown in fig. 1, there is provided a high power dual wavelength random distributed feedback raman fiber laser comprising: the device comprises a pumping source 1, a wavelength division multiplexer 2, an optical fiber high-reflection mirror 3, an acoustic optical fiber grating 4, a Raman optical fiber 5 and an end cap 6; the input end of the wavelength division multiplexer 2 is connected with the pumping source 1, and the other end of the same side is connected with the optical fiber high-reflection mirror 3; the output arm of the wavelength division multiplexer 2 is connected with an acousto-optic fiber grating 4; the output end of the acoustic fiber grating 4 is connected with one end of the Raman fiber 5; the other end of the Raman fiber 5 is connected with an end cap 6, and random fiber laser is output through the end cap 6; the acousto-optic fiber grating 4 consists of a radio frequency signal source, piezoelectric ceramics and few-mode optical fibers with coating layers stripped, and is used for adjusting a signal light mode and spectrum regulation.
In a specific embodiment, the acousto-optic fiber grating loss is less than 1dB. The pump light reaches the laser cavity after passing through the wavelength division multiplexer, the optical fiber high-reflection mirror provides broadband high reflectivity, and the optical fiber high-reflection mirror and distributed Rayleigh scattering in the Raman optical fiber form a semi-open cavity structure. The fiber optic high-reflectivity mirror can provide feedback for a wider wavelength. The stimulated Raman scattering effect based on the Raman fiber generates signal light, and the wavelength of the signal light is located in a Raman gain spectrum corresponding to the wavelength of the pump light. The signal generator of the sound-induced fiber bragg grating generates a sinusoidal signal with specific frequency and amplitude, the sinusoidal signal is amplified by 50 times through the voltage amplifier, the amplified signal is loaded to the piezoelectric ceramic, the signal is transmitted to at least a mode fiber through a taper angle on the piezoelectric ceramic, and sound-induced vibration is formed in the fiber. The grating period can be regulated and controlled through the frequency of the signal generator, and the fundamental mode LP01 and the first-order scalar high-order mode LP11 in the optical fiber meet the phase matching condition of specific wavelength by regulating the grating period, so that the conversion of the fundamental mode and the high-order mode laser at a certain specific wavelength in the optical fiber can be realized, and the mode regulation and control are realized. The stimulated Raman scattering and the distributed Rayleigh scattering have broadband characteristics and can generate broadband signal light. Mode competition exists in the optical fiber for signal light of different modes at different wavelengths, wherein a high-order LP11 mode has lower Raman gain than a fundamental mode LP01 mode and is in disadvantage in the mode competition, and therefore the wavelength intensity of the LP01 mode in broadband signal light is finally higher than that of the LP11 mode. Through mode competition at different wavelengths in the optical fiber, spectrum regulation and control of the random distribution feedback Raman optical fiber laser are finally realized at the output end, and through adjusting the frequency of the radio frequency signal, the wavelength of the LP11 mode can be just positioned at the middle specific wavelength of broadband signal light, the wavelength intensity is lower, the wavelength intensities at two sides are higher, dual-wavelength laser can be generated, and the dual-wavelength random optical fiber laser is output through the end cap.
In one embodiment, the radio frequency signal source comprises a signal generator and a voltage amplifier; one end of the voltage amplifier is connected with the signal generator, and the other end of the voltage amplifier is connected with the piezoelectric ceramic; the few-mode fiber is a step-index fiber.
In one embodiment, the signal generator is used for providing a sinusoidal signal with a specific frequency and amplitude; the voltage amplifier is used for amplifying the sinusoidal signal by 50 times.
In a specific embodiment, the acousto-optic fiber grating and its driving rf signal source are shown in fig. 3, and it includes few-mode fiber 301, piezoelectric ceramic 302, signal generator 303 and voltage amplifier 304; the few-mode optical fiber is a step-index optical fiber, and the bent section represents a few-mode optical fiber section with a coating layer stripped; the signal generator 303, which generates a sinusoidal signal of a specific frequency and amplitude, is connected to a voltage amplifier 304, said voltage amplifier 304 amplifying this signal by a factor of 50; a voltage amplifier 304 is connected to the piezoelectric ceramic 302 to apply an amplified signal to the piezoelectric ceramic, and a taper angle on the piezoelectric ceramic transfers the signal to at least the mode fiber 301 to create a sound induced vibration in the fiber. The grating period can be regulated and controlled by the frequency of the signal generator 303, and the fundamental mode LP01 and the first-order scalar high-order mode LP11 in the optical fiber meet the phase matching condition by adjusting the grating period, so that the conversion of the fundamental mode and the high-order mode laser in the optical fiber can be realized. For different laser wavelengths, signals with different frequencies are required to realize mode modulation, and the modulation frequency and the laser wavelength have a one-to-one correspondence relationship, which is shown in fig. 4. The loading signal response time is less than 1ms.
When the acoustic fiber grating is not loaded with signals, the random raman fiber laser outputs single-wavelength laser, and the output spectrum is shown in fig. 6.
The acoustic fiber bragg grating is loaded with an electric signal, the signal frequency corresponds to the modulation wavelength in the Raman gain spectrum corresponding to the wavelength bandwidth of the pumping source, stable dual-wavelength laser output can be obtained when a signal is specified by adjusting the signal frequency and the amplitude, the peak wavelength interval is about 10 nanometers, the signal-to-noise ratio is greater than 40dB, and the output spectrum is shown in figure 7.
In one embodiment, the pump source is a broadband amplification spontaneous emission light source or a high-power non-narrow linewidth laser with a two-stage amplifier, and comprises a seed source, a first-stage amplifier and a second-stage amplifier; the secondary amplifier comprises a laser diode array, a pumping signal beam combiner and a gain optical fiber; the seed source is a broadband light source in any wavelength range or a laser with any non-narrow line width, and the wavelength of the pumping source signal light is located in a Raman gain spectrum corresponding to the wavelength of the pumping source.
In one embodiment, as shown in FIG. 8, the random laser output power increases with increasing pump power, and the continuous optical output power can reach over 50 watts. Compared with the prior art, the structure is simpler, the power is obviously improved, and the technical progress is obvious.
In one embodiment, the raman fiber is a graded index fiber; the raman gain coefficient of a region in which a fundamental mode is located in the core of the graded-index fiber is higher than that of a higher-order mode.
In a specific embodiment, the raman fiber is a graded-index passive fiber having a core refractive index that is parabolic as shown in fig. 5, i.e., the core refractive index is square-law with the radial distance, and the refractive index gradually decreases with increasing radial distance. The Raman gain coefficient of the area where the fundamental mode is located in the fiber core is higher than that of the high-order mode, and the Raman gain extracting capability is stronger.
In a specific embodiment, the passive graded index fiber is used as a raman fiber, and the raman gain can be generated and amplified by using the stimulated raman scattering effect in the passive graded index fiber.
In one embodiment, a high-power isolator is added between the pump source and the wavelength division multiplexer and used for isolating backward return light damage and protecting the pump source.
In one embodiment, the two-stage amplifier, the wavelength division multiplexer and the circulator are arranged on a water-cooling plate.
In a specific embodiment, because the high-power system may generate heat, the secondary amplifier, the wavelength division multiplexer and the circulator of the pumping source are arranged on the water cooling plate, the temperature of the water cooling plate is controlled through the water cooling machine, the system is cooled, the safety of components is protected, and the pumping source is supplied with power through a special laser power supply.
In one embodiment, the fiber high-reflection mirror is a broadband fiber high-reflection mirror; the connecting optical fiber of the broadband optical fiber high-reflection mirror is a single-mode optical fiber, and the reflectivity in the wavelength range of 1-2 microns is greater than 99.5%.
In one embodiment, the pigtail of the end cap is a graded index fiber; the gradient direction, the gradient rate, the fiber core size, the refractive index value and the refractive index distribution of the graded-index optical fiber are the same; the end caps are plated with antireflection films corresponding to the output signal light wavelengths.
In one embodiment, the pump source is replaced with a non-narrow linewidth fiber oscillator.
In a specific embodiment, as shown in fig. 2, the pump source can be replaced by a non-narrow linewidth fiber oscillator, the system still comprises a wavelength division multiplexer 2, a fiber high-reflection mirror 3, an acoustic fiber grating 4, a raman fiber 5 and an end cap 6, and a circulator or an isolator can be removed.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (8)

1. A high power dual wavelength random distributed feedback raman fiber laser, said laser comprising: the device comprises a pumping source, a wavelength division multiplexer, an acoustic fiber grating, a fiber high-reflection mirror, a Raman fiber and an end cap; the input end of the wavelength division multiplexer is connected with the pumping source, and the other end of the same side of the wavelength division multiplexer is connected with the optical fiber high-reflection mirror; an output arm of the wavelength division multiplexer is connected with the acousto-optic fiber grating; the output end of the acoustic fiber bragg grating is connected with one end of the Raman fiber; the other end of the Raman fiber is connected with the end cap, and random fiber laser is output through the end cap; the acousto-optic fiber grating consists of a radio frequency signal source, piezoelectric ceramics and few-mode optical fibers with coating layers stripped, and is used for adjusting a signal light mode and spectrum regulation;
the radio frequency signal source comprises a signal generator and a voltage amplifier; one end of the voltage amplifier is connected with the signal generator, and the other end of the voltage amplifier is connected with the piezoelectric ceramic; the few-mode optical fiber is a step-index optical fiber;
the signal generator is used for providing a sinusoidal signal with specific frequency and amplitude; the voltage amplifier is used for amplifying the sinusoidal signal by 50 times.
2. The high power dual wavelength random distributed feedback raman fiber laser of claim 1, wherein said pump source is a broadband amplified spontaneous emission source with a two-stage amplifier or a high power non-narrow linewidth laser comprising a seed source, a first stage amplifier and a second stage amplifier; the secondary amplifier comprises a laser diode array, a pumping signal beam combiner and a gain optical fiber; the seed source is a broadband light source in any wavelength range or a laser with any non-narrow line width; and the wavelength of the pump source signal light is positioned in a Raman gain spectrum corresponding to the wavelength of the pump source.
3. The high power dual wavelength random distributed feedback raman fiber laser of claim 1, wherein said raman fiber is a graded index fiber; the Raman gain coefficient of the area where the fundamental mode is located in the fiber core of the graded index fiber is higher than that of the high-order mode.
4. The high-power dual-wavelength random distributed feedback raman fiber laser of claim 2, wherein a high-power isolator or circulator is added between the pump source and the wavelength division multiplexer for isolating backward return optical damage and protecting the pump source.
5. The high power dual wavelength random distributed feedback raman fiber laser of claim 4, wherein said secondary amplifier, wavelength division multiplexer and circulator are disposed on a water cooled plate.
6. The high power dual wavelength random distributed feedback raman fiber laser of claim 1, wherein said fiber high-reflectivity mirror is a broadband fiber high-reflectivity mirror; the connecting optical fiber of the broadband optical fiber high-reflection mirror is a single-mode optical fiber, and the reflectivity in the wavelength range of 1-2 microns is greater than 99.5%.
7. The high power dual wavelength random distributed feedback raman fiber laser of claim 3, wherein the pigtail of the end cap is a graded index fiber; the gradient direction, the gradient rate, the fiber core size, the refractive index value and the refractive index distribution of the graded-index optical fiber and the Raman optical fiber are the same; the end caps are plated with antireflection films corresponding to the output signal light wavelengths.
8. The high power dual wavelength random distributed feedback raman fiber laser of claim 1 wherein said pump source is replaced with a non-narrow linewidth fiber oscillator.
CN202211576139.1A 2022-12-09 2022-12-09 High-power dual-wavelength random distribution feedback Raman fiber laser Active CN115579718B (en)

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EP1318579A1 (en) * 2001-12-10 2003-06-11 Corning Incorporated Multi-wavelength raman laser
CN205646425U (en) * 2016-04-29 2016-10-12 燕山大学 Tunable fiber laser based on optic fibre overlaps grating
CN205811268U (en) * 2016-07-18 2016-12-14 湖北久之洋红外系统股份有限公司 All-fiber adjusts Q optical fiber seed source laser
CN106299988B (en) * 2016-10-28 2021-03-30 电子科技大学 Cascade output optical fiber Raman random laser
CN110829166A (en) * 2019-12-10 2020-02-21 中国人民解放军国防科技大学 Raman fiber amplifier with light beam purification function
CN111969400B (en) * 2020-08-27 2022-02-15 中国人民解放军国防科技大学 High power fiber laser system
CN112600061A (en) * 2020-12-29 2021-04-02 深圳技术大学 Tunable Raman fiber laser
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