CN115459044B - System and method for inhibiting stimulated Brillouin scattering of high-power optical fiber laser - Google Patents
System and method for inhibiting stimulated Brillouin scattering of high-power optical fiber laser Download PDFInfo
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- 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
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- 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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- H01S3/06758—Tandem amplifiers
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
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- 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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094042—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094069—Multi-mode pumping
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/1001—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by controlling the optical pumping
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10084—Frequency control by seeding
- H01S3/10092—Coherent seed, e.g. injection locking
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1022—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping
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Abstract
According to the system and the method for inhibiting the stimulated Brillouin scattering of the high-power optical fiber laser, laser is generated through the single-frequency laser and is input to the input end of the electro-optical modulator; performing frequency sweep modulation on input laser through the electro-optic modulator to obtain a modulation sideband of frequency scanning; inputting the modulation sideband of the frequency scanning to the input end of the fiber optic circulator through the output end of the electro-optic modulator; receiving, by the fiber optic circulator, modulation sidebands of the frequency sweep through a second port; and receiving the laser input by the semiconductor laser through the optical fiber circulator, and locking the laser input by the semiconductor laser on the modulation sideband of the frequency scanning to obtain the laser with variable frequency. The semiconductor laser injection locking technology can be adopted, frequency fast tuning is achieved, a rectangular spectrum which is difficult to achieve through traditional phase modulation can be generated, and stimulated Brillouin scattering can be restrained more efficiently.
Description
Technical Field
The invention relates to the technical field of laser, in particular to a system and a method for inhibiting stimulated Brillouin scattering of a high-power optical fiber laser.
Background
In the process of generating and transmitting high-power laser, due to the fact that the incident light power is high, ultrasonic waves are excited in a substance by an electromagnetic stretching effect generated by light waves, and therefore stimulated Brillouin scattering generated by the fact that the incident light is scattered by the ultrasonic waves is caused.
Disclosure of Invention
The embodiment of the invention aims to provide a system and a method for inhibiting stimulated Brillouin scattering of a high-power optical fiber laser, so as to inhibit the stimulated Brillouin scattering. The specific technical scheme is as follows:
in a first aspect of the embodiments of the present invention, a system for suppressing stimulated brillouin scattering of a high-power fiber laser is provided, where the system includes: single-frequency laser, electro-optical modulator, optical fiber circulator, semiconductor laser;
the single-frequency laser is used for generating laser and inputting the generated laser to the input end of the electro-optical modulator;
the electro-optic modulator is used for carrying out frequency sweep modulation on input laser to obtain a modulation sideband of frequency scanning; inputting the modulation sideband of the frequency sweep to an input end of the fiber optic circulator through an output end;
the fiber optic circulator is used for receiving a modulation sideband of the frequency scanning through a first port; and the second port receives the laser input by the semiconductor laser and locks the laser input by the semiconductor laser on the modulation sideband of the frequency scanning to obtain the laser with variable frequency.
In one possible embodiment, the system further comprises: a radio frequency signal source;
the radio frequency signal source is used for generating a broadband frequency sweep frequency signal and inputting the sweep frequency signal to the radio frequency input end of the electro-optical modulator, so that the electro-optical modulator performs frequency sweep modulation on input laser according to the sweep frequency signal to obtain a modulation sideband of frequency scanning.
In one possible embodiment, the system further comprises a fiber pre-amplifier and a fiber amplifier;
the optical fiber preamplifier is used for receiving the laser with the frequency change and carrying out preamplifier;
and the amplifier is used for receiving and amplifying the laser power with narrow line width of the pre-amplified laser.
In one possible embodiment, the single frequency laser is a high frequency stable narrow linewidth semiconductor laser or a narrow linewidth fiber laser;
and the wavelength tuning range of the laser output by the single-frequency laser covers the injection locking area of the semiconductor laser.
In one possible embodiment, the electro-optical modulator is an intensity modulator or a phase modulator;
the electro-optical modulator generates multi-order symmetrical sidebands outside the original carrier frequency after radio frequency modulation, and controls the quantity and the strength of the sidebands through modulation depth.
In a second aspect of the embodiments of the present invention, a method for suppressing stimulated brillouin scattering of a high power fiber laser is provided, which is applied to a system for suppressing stimulated brillouin scattering of a high power fiber laser, where the system includes: single frequency laser, electro-optic modulator, optical fiber circulator, semiconductor laser;
the method comprises the following steps:
generating laser by the single-frequency laser, and inputting the generated laser to the input end of the electro-optical modulator;
performing frequency sweep modulation on input laser through the electro-optic modulator to obtain a modulation sideband of frequency scanning; inputting the modulation sideband of the frequency scanning to the input end of the fiber optic circulator through the output end of the electro-optic modulator;
receiving, by the fiber optic circulator, modulation sidebands of the frequency sweep through a first port; and receiving the laser input by the semiconductor laser through the second port of the optical fiber circulator, and locking the laser input by the semiconductor laser on the modulation sideband of the frequency scanning to obtain the laser with variable frequency.
In a possible implementation, the system for suppressing stimulated brillouin scattering of a high power fiber laser further includes: a radio frequency signal source;
the frequency sweeping modulation of the input laser through the electro-optic modulator to obtain a modulation sideband of frequency scanning comprises:
and generating a frequency sweep frequency signal of a broadband through the radio frequency signal source, and inputting the sweep frequency signal to the radio frequency input end of the electro-optical modulator so that the electro-optical modulator performs sweep frequency modulation on the input laser according to the sweep frequency signal to obtain a modulation sideband of frequency scanning.
In a possible implementation, the system for suppressing the stimulated brillouin scattering of the high-power optical fiber laser further comprises an optical fiber pre-amplifier and an optical fiber amplifier;
the method further comprises the following steps:
receiving the laser with the changed frequency through the optical fiber preamplifier, and performing preamplification; and receiving and carrying out narrow linewidth laser power amplification on the pre-amplified laser through the amplifier.
In one possible embodiment, the single frequency laser is a high frequency stable narrow linewidth semiconductor laser or a narrow linewidth fiber laser; and the wavelength tuning range of the laser output by the single-frequency laser covers the injection locking area of the semiconductor laser.
In one possible embodiment, the electro-optical modulator is an intensity modulator or a phase modulator;
the electro-optical modulator generates multi-order symmetrical sidebands outside the original carrier frequency after radio frequency modulation, and controls the quantity and strength of the sidebands through modulation depth.
The embodiment of the invention also provides electronic equipment which comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory are communicated with each other through the communication bus;
a memory for storing a computer program;
and the processor is used for realizing any one of the above methods for inhibiting the stimulated Brillouin scattering of the high-power optical fiber laser when executing the program stored in the memory.
The embodiment of the invention also provides a computer readable storage medium, in which a computer program is stored, and when the computer program is executed by a processor, the method for suppressing stimulated brillouin scattering of a high-power optical fiber laser is implemented.
Embodiments of the present invention further provide a computer program product containing instructions, which when run on a computer, causes the computer to execute any one of the above methods for suppressing stimulated brillouin scattering of a high power fiber laser.
The embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides a system and a method for inhibiting stimulated Brillouin scattering of a high-power optical fiber laser, which are applied to the system for inhibiting the stimulated Brillouin scattering of the high-power optical fiber laser, and the system comprises the following components: single frequency laser, electro-optic modulator, optical fiber circulator, semiconductor laser; the method comprises the following steps: generating laser by the single-frequency laser, and inputting the generated laser to the input end of the electro-optical modulator; performing frequency sweep modulation on input laser through the electro-optic modulator to obtain a modulation sideband of frequency scanning; inputting the modulation sideband of the frequency scanning to the input end of the fiber optic circulator through the output end of the electro-optic modulator; receiving, by the fiber optic circulator, modulation sidebands of the frequency sweep through a second port; and receiving the laser input by the semiconductor laser through the optical fiber circulator, and locking the laser input by the semiconductor laser on the modulation sideband of the frequency scanning to obtain the laser with variable frequency. By the method provided by the embodiment of the invention, the semiconductor laser injection locking technology can be adopted, the frequency fast tuning is realized, the rectangular spectrum which is difficult to realize by the traditional phase modulation can be generated, and the stimulated Brillouin scattering can be more efficiently inhibited.
Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other embodiments can be obtained by referring to these drawings.
Fig. 1 is a schematic structural diagram of a system for suppressing stimulated brillouin scattering of a high-power fiber laser according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an apparatus for suppressing stimulated brillouin scattering of a high-power fiber laser according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a method for suppressing stimulated brillouin scattering of a high-power fiber laser according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by one skilled in the art based on the embodiments of the present invention, are within the scope of the present invention.
In a first aspect of the embodiments of the present invention, there is provided a system for suppressing stimulated brillouin scattering of a high-power fiber laser, referring to fig. 1, the system includes: a single-frequency laser 101, an electro-optical modulator 102, an optical fiber circulator 103 and a semiconductor laser;
the single-frequency laser 101 is used for generating laser and inputting the generated laser to the input end of the electro-optical modulator;
the electro-optical modulator 102 is used for performing frequency sweep modulation on input laser to obtain a modulation sideband of frequency sweep; inputting the modulation sideband of the frequency scanning to the input end of the optical fiber circulator through the output end;
a fiber circulator 103 for receiving modulation sidebands of the frequency sweep through the second port; and receiving laser input by the semiconductor laser, and locking the laser input by the semiconductor laser on a modulation sideband of frequency scanning to obtain laser with variable frequency.
The single-frequency laser, namely the single longitudinal mode laser in the embodiment of the invention has an output laser mode which meets both the single transverse mode and the single longitudinal mode, only the single longitudinal mode in the resonant cavity oscillates, and the output light intensity presents Gaussian distribution. Besides good monochromaticity and directivity of laser, the single-frequency laser has the characteristics of long coherence length and narrow spectral line width which are difficult to achieve by a common laser. The method has wide application in the fields of laser radar, laser ranging, laser remote sensing, laser medical treatment, spectroscopy, optical frequency standard, nonlinear optical frequency conversion and the like.
Among them, the electro-optical modulator in the embodiment of the present invention is a modulator made by using the electro-optical effect of some electro-optical crystals, such as lithium niobate crystal (LiNb 03), gallium arsenide crystal (GaAs), and lithium tantalate crystal (LiTa 03). The electro-optic effect, i.e., when a voltage is applied to the electro-optic crystal, the refractive index of the electro-optic crystal changes, resulting in a change in the characteristics of the light wave passing through the crystal, which effects modulation of the phase, amplitude, intensity, and polarization state of the optical signal.
The optical fiber circulator in the embodiment of the invention can realize bidirectional optical signal transmission on a single optical fiber. The signal transmission direction of the circulator is irreversible, and optical signals can only be guided from one port to another port in one direction at a time, and the optical signals, although being redirected, must pass through the ports in sequence along one direction. For example, a three-port circulator optical signal must travel from port 1 to port 2 and then to port 3. The product is widely used in the fields of fiber lasers, optical powder insertion multiplexing, bidirectional pumping systems, dispersion compensation devices, fiber sensing, scientific research and the like.
The semiconductor laser in the embodiment of the present invention is also called a laser diode, and is a laser using a semiconductor material as a working substance. Due to the difference in material structure, the specific process of generating laser light in different types is more specific. Common working substances are gallium arsenide (GaAs), cadmium sulfide (CdS), indium phosphide (InP), zinc sulfide (ZnS), and the like. The excitation mode includes three modes of electric injection, electron beam excitation and optical pumping. Semiconductor laser devices can be classified into homojunctions, single heterojunctions, double heterojunctions, and the like. The homojunction laser and the single heterojunction laser are mostly pulse devices at room temperature, and the double heterojunction laser can realize continuous work at room temperature.
In an example, referring to fig. 2, fig. 2 is a schematic structural diagram of a device for suppressing stimulated brillouin scattering of a high-power fiber laser according to an embodiment of the present invention. The invention comprises a single-frequency laser 201, a radio frequency signal source 202, an electro-optical modulator 203, an adjustable attenuator 204, a fiber circulator 205, a semiconductor laser 206, a fiber preamplifier 207 and a fiber main amplifier 208. In one example, the rf signal source 202 is a high-bandwidth arbitrary waveform generator, which generates a linear sweep signal of 5GHz-15GHz with a sweep period of 50ns, and the sweep signal is accessed to the rf input terminal of the electro-optic modulator 203; the single-frequency laser 201 is a 1064 nm-waveband narrow-linewidth optical fiber laser, and performs frequency sweeping modulation on the output laser through the electro-optical modulator 203 to generate a modulation sideband of frequency scanning; the laser modulated by the sweep frequency enters the adjustable attenuator 204 from the output end of the electro-optical modulator 203 to control the laser power, then enters from the port 1 of the optical fiber circulator 205, is output from the port 2 of the optical fiber circulator 206 and is injected into the semiconductor laser 206, and the semiconductor laser 206 is a 1064nm wave band distributed feedback semiconductor laser. In one example, the narrow linewidth fiber laser is spaced 10GHz from the distributed feedback semiconductor laser wavelength, and the wavelength of the +1 order modulation sidebands is tuned to the injection locking region of the distributed feedback semiconductor laser 206. In one example, the output wavelength of the distributed feedback semiconductor laser 206 is locked to the +1 modulation sideband, and its output frequency varies with the frequency of the modulation sideband; the injection-locked distributed feedback type semiconductor laser 206 as a seed source sequentially enters the optical fiber preamplifier 207 and the optical fiber main amplifier 208 to realize the step-by-step amplification of the narrow-linewidth laser power, and the high-power narrow-linewidth optical fiber laser output is realized.
Therefore, the system provided by the embodiment of the invention can adopt the semiconductor laser injection locking technology to realize frequency fast tuning, can generate a rectangular spectrum which is difficult to realize by traditional phase modulation, and can more efficiently inhibit the stimulated Brillouin scattering.
In a possible implementation, the system further includes: a radio frequency signal source; and the radio frequency signal source is used for generating a frequency sweep frequency signal of a broadband, and inputting the sweep frequency signal to the radio frequency input end of the electro-optical modulator so that the electro-optical modulator performs sweep frequency modulation on the input laser according to the sweep frequency signal to obtain a modulation sideband of frequency scanning.
In a possible embodiment, the system further comprises a fiber pre-amplifier and a fiber amplifier; the optical fiber pre-amplifier is used for receiving the laser with variable frequency and pre-amplifying the laser; and the amplifier is used for receiving and amplifying the laser power of the preamplified laser in a narrow line width.
In one possible embodiment, the single frequency laser is a high frequency stable narrow linewidth semiconductor laser or a narrow linewidth fiber laser; the wavelength tuning range of the laser light output by the single-frequency laser covers the injection locking area of the semiconductor laser.
In one possible embodiment, the electro-optical modulator is an intensity modulator or a phase modulator; the electro-optical modulator generates multi-order symmetrical sidebands outside the original carrier frequency after radio frequency modulation, and controls the quantity and the strength of the sidebands through modulation depth.
Wherein the RF signal source may be a calibrated RF radio measurement instrument using indirect synthesis and relating the frequency of the main vibration source to the frequency of the reference frequency source through a phase-locked loop.
The optical fiber amplifier can be a novel all-optical amplifier applied to an optical fiber communication line to realize signal amplification. Generally, the optical fiber amplifier is divided into three types, i.e., a relay amplifier, a pre-amplifier and a power amplifier, according to the position and the function of the optical fiber amplifier in the optical fiber line.
An adjustable attenuator can be further included between the electro-optical modulator and the optical fiber circulator. The adjustable attenuator can reduce the energy of optical signals, attenuate the input optical power and avoid the distortion generated by an optical receiver due to the ultra-strong input optical power.
In one example, the optical fiber pre-amplifier 207 and the optical fiber main amplifier 208 are high-power ytterbium-doped optical fiber laser amplifiers with a waveband of 1 μm, have power amplification capability of several kilowatts, and are internally provided with narrow-band filters to improve the signal-to-noise ratio of output laser.
In one example, the distributed feedback semiconductor laser 206 has no isolator therein, outputs a single longitudinal mode and a single transverse mode, has an output wavelength matched with the amplified wavelength bands of the fiber preamplifier 208 and the fiber main amplifier 209, has an output power of greater than 20mW, and has a side mode suppression ratio of greater than 50dB.
In one example, the RF signal source 202 is an arbitrary waveform generator, which can output waveforms by user-defined, and set RF signals with different frequency ranges and different scanning speeds.
In one example, the electro-optical modulator 203 is an intensity modulator or a phase modulator, the bandwidth is greater than 15GHz, multi-order symmetrical sidebands outside the original carrier frequency are generated after radio frequency modulation, and the number and intensity of the sidebands are controlled by the output intensity of the radio frequency signal source 202.
In one example, the tuning range of the output wavelength of the single-frequency laser 201 covers the injection locking region of the distributed feedback semiconductor laser 206, the line width is less than 100kHz, and the line width of the distributed feedback semiconductor laser 206 is less than 100kHz after locking. The wavelength of the distributed feedback type semiconductor laser 206 subjected to sideband injection locking dynamically changes along with the frequency change of the modulation signal, the spectrum is rectangular, and the wavelength is used as a seed source to be injected into the optical fiber amplifier, so that power amplification is realized, and the stimulated Brillouin scattering threshold value is improved.
To illustrate the method of embodiments of the present invention, the following description is set forth in connection with specific embodiments, see FIG. 2;
1. the single-frequency laser 201 outputs laser light to enter the input end of the electro-optical modulator 203; a sweep frequency signal generated by a radio frequency signal source 202 is accessed to a radio frequency input end of an electro-optical modulator 203, sweep frequency modulation is carried out on laser output by a single frequency laser 201, a modulation sideband of frequency scanning is generated, the laser after sweep frequency modulation enters an adjustable attenuator 204 from an output end of the electro-optical modulator 203 to control laser power, then enters from a port 1 of an optical fiber circulator 205, is output from a port 2 of the optical fiber circulator 205 and is injected into a semiconductor laser 206, the output wavelength of the semiconductor laser 206 is locked on the modulation sideband, and the output frequency of the semiconductor laser 206 is changed along with the frequency change of the modulation sideband; the sweep-frequency laser injected and locked by the semiconductor laser 206 as seed light sequentially enters the optical fiber preamplifier 207 and the optical fiber main amplifier 208 to realize narrow-linewidth laser power amplification.
2. The optical fiber pre-amplifier 207 and the optical fiber main amplifier 208 are high-power optical fiber laser amplifiers, and have power amplification capability of several tens of watts to several thousands of watts.
3. The semiconductor laser 206 has no isolator inside, the output laser is in single longitudinal mode and single transverse mode, and the output wavelength is matched with the amplification wave bands of the optical fiber preamplifier 207 and the optical fiber main amplifier 208.
4. After the semiconductor laser 206 is locked by sideband injection, the wavelength dynamically changes with the frequency of the modulation signal, and the spectrum is rectangular.
5. Rf signal source 202 generates a broadband frequency swept rf signal.
6. The single-frequency laser 201 is a narrow-linewidth semiconductor laser or a narrow-linewidth fiber laser with high frequency stability, and an output wavelength tuning range covers an injection locking region of the semiconductor laser 206.
7. The electro-optical modulator 203 is an intensity modulator or a phase modulator, generates multi-order symmetrical sidebands outside the original carrier frequency after radio frequency modulation, and controls the quantity and the strength of the sidebands through modulation depth.
In a second aspect of the embodiments of the present invention, a method for suppressing stimulated brillouin scattering of a high power fiber laser is provided, which is applied to a system for suppressing stimulated brillouin scattering of a high power fiber laser, and the system includes: single frequency laser, electro-optic modulator, optical fiber circulator, semiconductor laser;
referring to fig. 3, the above method includes:
step S31, generating laser by a single-frequency laser, and inputting the generated laser to the input end of an electro-optical modulator;
step S32, performing frequency sweep modulation on the input laser through the electro-optic modulator to obtain a modulation sideband of frequency sweep; inputting the modulation sideband of frequency scanning to the input end of the optical fiber circulator through the output end of the electro-optical modulator;
step S33, receiving a modulation sideband of frequency scanning through a second port by the optical fiber circulator; and receiving laser input by the semiconductor laser through the optical fiber circulator, and locking the laser input by the semiconductor laser on a modulation sideband of frequency scanning to obtain laser with variable frequency.
In one possible embodiment, the system for suppressing stimulated brillouin scattering of the high-power fiber laser further includes: a radio frequency signal source;
the method comprises the following steps of performing frequency sweep modulation on input laser through an electro-optic modulator to obtain a modulation sideband of frequency sweep, wherein the modulation sideband comprises the following steps:
and generating a frequency sweep frequency signal of a broadband through a radio frequency signal source, and inputting the sweep frequency signal to a radio frequency input end of the electro-optical modulator so that the electro-optical modulator performs sweep frequency modulation on the input laser according to the sweep frequency signal to obtain a modulation sideband of frequency scanning.
In one possible embodiment, the system for suppressing stimulated brillouin scattering of the high-power optical fiber laser further comprises an optical fiber pre-amplifier and an optical fiber amplifier;
the method further comprises the following steps:
receiving laser with variable frequency through an optical fiber preamplifier, and performing preamplification; and receiving and carrying out narrow linewidth laser power amplification on the pre-amplified laser through an amplifier.
In one possible embodiment, the single frequency laser is a narrow linewidth semiconductor laser or a narrow linewidth fiber laser with high frequency stability; the wavelength tuning range of the laser light output by the single-frequency laser covers the injection locking area of the semiconductor laser.
In one possible embodiment, the electro-optical modulator is an intensity modulator or a phase modulator;
the electro-optical modulator generates multi-order symmetrical sidebands outside the original carrier frequency after radio frequency modulation, and controls the quantity and the strength of the sidebands through modulation depth.
Therefore, by the method provided by the embodiment of the invention, the semiconductor laser injection locking technology can be adopted, the frequency fast tuning is realized, the rectangular spectrum which is difficult to realize by the traditional phase modulation can be generated, and the stimulated Brillouin scattering can be more efficiently inhibited.
An embodiment of the present invention further provides an electronic device, as shown in fig. 4, including a processor 401, a communication interface 402, a memory 403, and a communication bus 404, where the processor 401, the communication interface 402, and the memory 403 complete mutual communication through the communication bus 404,
a memory 403 for storing a computer program;
the processor 401, when executing the program stored in the memory 403, implements the following steps:
generating laser by a single-frequency laser, and inputting the generated laser into an input end of an electro-optical modulator;
performing frequency sweep modulation on input laser through an electro-optic modulator to obtain a modulation sideband of frequency scanning; inputting the modulation sideband of frequency scanning to the input end of the optical fiber circulator through the output end of the electro-optical modulator;
receiving, by the fiber optic circulator, modulation sidebands of the frequency sweep through the second port; and receiving laser input by the semiconductor laser through the optical fiber circulator, and locking the laser input by the semiconductor laser on a modulation sideband with frequency scanning to obtain laser with variable frequency.
The communication bus mentioned in the electronic device may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The communication bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown, but this does not mean that there is only one bus or one type of bus.
The communication interface is used for communication between the electronic equipment and other equipment.
The Memory may include a Random Access Memory (RAM) or a Non-Volatile Memory (NVM), such as at least one disk Memory. Alternatively, the memory may be at least one memory device located remotely from the processor.
The Processor may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but also Digital Signal Processors (DSPs), application Specific Integrated Circuits (ASICs), field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components.
In a further embodiment provided by the present invention, a computer-readable storage medium is further provided, in which a computer program is stored, and the computer program when executed by a processor implements the steps of any one of the above methods for suppressing stimulated brillouin scattering of a high power fiber laser.
In a further embodiment provided by the present invention, there is also provided a computer program product containing instructions which, when run on a computer, cause the computer to perform any of the above described methods of suppressing stimulated brillouin scattering in a high power fibre laser.
In the above embodiments, all or part of the implementation may be realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions according to the embodiments of the invention are brought about in whole or in part when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)) or wirelessly (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk (SSD)), among others.
It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a component of' 8230; \8230;" does not exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the method, electronic device, storage medium, and computer program product embodiments, the description is relatively simple because they are substantially similar to the method embodiments, and reference may be made to some descriptions of the method embodiments for relevant points.
The above are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. A system for suppressing stimulated brillouin scattering in a high power fiber laser, said system comprising: single frequency laser, electro-optic modulator, optical fiber circulator, semiconductor laser;
the single-frequency laser is used for generating laser and inputting the generated laser to the input end of the electro-optical modulator;
the electro-optic modulator is used for carrying out frequency sweep modulation on input laser to obtain a modulation sideband of frequency scanning; inputting the modulation sideband of the frequency sweep to an input end of the fiber optic circulator through an output end;
the fiber optic circulator is used for receiving a modulation sideband of the frequency scanning through a first port; and the second port receives the laser input by the semiconductor laser and locks the laser input by the semiconductor laser on the modulation sideband of the frequency scanning to obtain the laser with variable frequency.
2. The system of claim 1, further comprising: a radio frequency signal source;
the radio frequency signal source is used for generating a broadband frequency sweep frequency signal and inputting the sweep frequency signal to the radio frequency input end of the electro-optical modulator, so that the electro-optical modulator performs frequency sweep modulation on input laser according to the sweep frequency signal to obtain a modulation sideband of frequency scanning.
3. The system of claim 1, further comprising a fiber pre-amplifier and a fiber amplifier;
the optical fiber preamplifier is used for receiving the laser with the frequency change and carrying out preamplifier;
and the amplifier is used for receiving and amplifying the laser power with narrow line width of the pre-amplified laser.
4. The system of claim 1,
the single-frequency laser is a narrow linewidth semiconductor laser or a narrow linewidth optical fiber laser with high frequency stability;
and the wavelength tuning range of the laser output by the single-frequency laser covers the injection locking area of the semiconductor laser.
5. The system of claim 1,
the electro-optic modulator is an intensity modulator or a phase modulator;
the electro-optical modulator generates multi-order symmetrical sidebands outside the original carrier frequency after radio frequency modulation, and controls the quantity and the strength of the sidebands through modulation depth.
6. A method for inhibiting stimulated Brillouin scattering of a high-power optical fiber laser is characterized by being applied to the realization of a system for inhibiting the stimulated Brillouin scattering of the high-power optical fiber laser, and the system comprises the following steps: single-frequency laser, electro-optical modulator, optical fiber circulator, semiconductor laser;
the method comprises the following steps:
generating laser by the single-frequency laser, and inputting the generated laser to the input end of the electro-optical modulator;
performing frequency sweep modulation on input laser through the electro-optic modulator to obtain a modulation sideband of frequency scanning; inputting the modulation sideband of the frequency sweep to the input end of the fiber optic circulator through the output end of the electro-optic modulator;
receiving, by the fiber optic circulator, modulation sidebands of the frequency sweep through a first port; and receiving the laser input by the semiconductor laser through the second port of the optical fiber circulator, and locking the laser input by the semiconductor laser on the modulation sideband of the frequency scanning to obtain the laser with variable frequency.
7. The method of claim 6, wherein the system for suppressing stimulated Brillouin scattering in the high power fiber laser further comprises: a radio frequency signal source;
the frequency sweeping modulation of the input laser through the electro-optical modulator to obtain a modulation sideband of frequency scanning includes:
and generating a broadband frequency sweep frequency signal through the radio frequency signal source, and inputting the sweep frequency signal to a radio frequency input end of the electro-optical modulator so that the electro-optical modulator performs frequency sweep modulation on input laser according to the sweep frequency signal to obtain a modulation sideband of frequency scanning.
8. The method of claim 6, wherein the system for suppressing stimulated Brillouin scattering in the high power fiber laser further comprises a fiber pre-amplifier and a fiber amplifier;
the method further comprises the following steps:
receiving the laser with the changed frequency through the optical fiber preamplifier, and performing pre-amplification; and receiving and carrying out narrow linewidth laser power amplification on the pre-amplified laser through the amplifier.
9. The method of claim 6,
the single-frequency laser is a narrow linewidth semiconductor laser or a narrow linewidth optical fiber laser with high frequency stability; and the wavelength tuning range of the laser output by the single-frequency laser covers the injection locking area of the semiconductor laser.
10. The method of claim 6,
the electro-optic modulator is an intensity modulator or a phase modulator;
the electro-optical modulator generates multi-order symmetrical sidebands outside the original carrier frequency after radio frequency modulation, and controls the quantity and strength of the sidebands through modulation depth.
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