CN114465079A - Narrow-linewidth pulse fiber laser and control method thereof - Google Patents
Narrow-linewidth pulse fiber laser and control method thereof Download PDFInfo
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- 239000000835 fiber Substances 0.000 title claims description 76
- 239000013307 optical fiber Substances 0.000 claims abstract description 50
- 238000012544 monitoring process Methods 0.000 claims abstract description 38
- 238000005086 pumping Methods 0.000 claims abstract description 25
- 230000005540 biological transmission Effects 0.000 claims abstract description 6
- 230000003321 amplification Effects 0.000 claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 229910003327 LiNbO3 Inorganic materials 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 4
- 230000009123 feedback regulation Effects 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
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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
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
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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
- H01S3/06754—Fibre amplifiers
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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
- H01S3/09—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
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
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Abstract
The invention provides a narrow linewidth pulse optical fiber laser and a control method thereof, along the transmission direction of light, the laser comprises the following components in sequence: the system comprises a seed source, an intensity modulator, a multi-stage preamplifier and a power amplifier; the laser is provided with a feedback adjusting assembly, the feedback adjusting assembly receives power monitoring signals of the input end and the output end of the power amplifier, and adjusts the line width of seed light output by the seed source and the pumping power of the power amplifier based on the power monitoring signals. Therefore, a feedback path is formed, and the laser can be adjusted in a self-adaptive mode to have the narrowest line width matched with different laser peak powers corresponding to the same laser, so that the application requirement that the narrow-line-width pulse optical fiber laser has high peak power and narrow line width at the same time can be met.
Description
Technical Field
The invention relates to the technical field of lasers, in particular to a narrow-linewidth pulse fiber laser and a control method thereof.
Background
The narrow-linewidth pulse fiber laser is used as a laser source and is greatly applied to nonlinear frequency conversion, coherent synthesis and spectrum synthesis. In these applications, the laser is required to have a higher peak power on one hand, and on the other hand, the narrower the line width of the output laser is, the better the frequency doubling efficiency and the better the synthesis efficiency are.
The main factor limiting the power boost of narrow linewidth lasers is the Stimulated Brillouin Scattering (SBS) effect. Laser power and gain optical fiber core section area A and effective optical fiber length LeffBrillouin gain coefficient gBAnd the line width Δ v of the laser, as shown in formula (1).
Wherein, Delta nuBIntrinsic linewidth is about 10 MHz. As can be seen from the formula (1), the line width Δ ν of the laser and SBS have an effect of mutual restriction. The narrower the line width delta v is, the easier the line width delta v reaches the threshold value of SBS, and the nonlinear effect is caused to inhibit the continuous improvement of the output laser peak power. If the line width Δ ν of the laser needs to be increased in order to obtain the laser with higher peak power, the requirements on the line width of the laser source of the narrow-line-width pulse fiber laser in applications such as nonlinear frequency conversion, coherent synthesis, and spectrum synthesis cannot be met.
Disclosure of Invention
The invention provides a narrow-linewidth pulse fiber laser and a control method thereof, aiming at solving the technical problem of how to improve the peak power of laser under the condition of meeting the linewidth requirement.
According to the narrow linewidth pulse fiber laser provided by the embodiment of the invention, along the transmission direction of light, the laser comprises the following components in sequence: the system comprises a seed source, an intensity modulator, a multi-stage preamplifier and a power amplifier;
the laser is provided with a feedback adjusting assembly, the feedback adjusting assembly receives power monitoring signals of the input end and the output end of the power amplifier, and adjusts the line width of seed light output by the seed source and the pumping power of the power amplifier based on the power monitoring signals.
According to some embodiments of the invention, the feedback adjustment assembly comprises:
the first optical fiber beam splitter is arranged at the upstream of the power amplifier and used for collecting a power monitoring signal at the input end of the power amplifier;
the second optical fiber beam splitter is arranged at the downstream of the power amplifier and used for collecting a power monitoring signal at the output end of the power amplifier;
and the signal processor is connected with the first optical fiber beam splitter, the second optical fiber beam splitter, the seed source and the power amplifier, receives power monitoring signals collected by the first optical fiber beam splitter and the second optical fiber beam splitter, and adjusts the line width of seed light output by the seed source and the pumping power of the power amplifier based on the power monitoring signals.
In some embodiments of the invention, the feedback adjustment assembly further comprises: and the line width modulation driver is connected with the seed source and the signal processor and is used for adjusting the line width of the seed light output by the seed source according to the received control signal of the signal processor.
According to some embodiments of the present invention, the line width modulation driver is a driving circuit loaded on the seed source, and adjusts the line width of the seed light output by the seed source by changing the bandwidth of the modulation signal at the output end of the line width modulation driver.
In some embodiments of the invention, the power amplifier comprises: the signal processor is connected with the pumping LD so as to adjust the pumping power of the pumping LD based on the power monitoring signal.
According to some embodiments of the present invention, the pump power of the pump LD is a plurality of steps which increase stepwise.
In some embodiments of the present invention, the first fiber splitter and the second fiber splitter each comprise: the signal processor acquires the power monitoring signals from the acquisition ports of the first optical fiber beam splitter and the second optical fiber beam splitter.
According to some embodiments of the present invention, the seed source is a DFB type single frequency semiconductor laser, outputting continuous seed light;
the intensity modulator is a LiNbO3 electro-optical modulator, and the input continuous seed light is modulated into pulse seed light with the pulse width within a preset range and then is input into the multistage preamplifier.
According to the control method of the narrow-linewidth pulse fiber laser, the control method is used for adjusting and controlling the linewidth and the power of the laser output by the narrow-linewidth pulse fiber laser, and the control method comprises the following steps:
starting a laser, and outputting continuous seed light with a preset line width by a seed source under the control of a line width modulation driver;
the continuous seed light passes through an intensity modulator to output pulse seed light;
the pulse seed light is subjected to step-by-step power amplification through a multi-stage preamplifier and a power amplifier;
the signal processor simultaneously monitors power monitoring signals collected by the first optical fiber beam splitter and the second optical fiber beam splitter;
and the signal processor adjusts the line width of the seed light output by the seed source and the pumping power of the power amplifier based on the power monitoring signal.
According to some embodiments of the invention, the signal processor adjusting the line width of the seed source and the pump power of the power amplifier based on the power monitoring signal comprises:
judging whether the return light power is linearly increased or not based on the power monitoring signals collected from the first optical fiber beam splitter and the second optical fiber beam splitter;
if the return light power is linearly increased, controlling a pumping LD in the power amplifier to increase the pumping power by one order;
and if the return light power does not increase linearly any more, controlling the pumping power to be unchanged, and simultaneously controlling the line width driving modulator to widen the line width of the seed light output by the seed source until the monitored return light power returns to the linear increasing state.
The narrow-linewidth pulse fiber laser and the control method thereof provided by the invention have the following beneficial effects:
through forming the feedback path, corresponding to the same laser, the laser can be adjusted in a self-adaptive mode to enable the laser to have the narrowest line width matched with different laser peak power, and therefore the application requirement that a narrow-line-width pulse optical fiber laser has high peak power and narrow line width at the same time can be met.
Drawings
Fig. 1 is a schematic structural diagram of a narrow linewidth pulsed fiber laser according to an embodiment of the present invention;
fig. 2 is a flowchart of a control method of a narrow-linewidth pulse fiber laser according to an embodiment of the present invention.
Reference numerals:
the system comprises a seed source 10, an intensity modulator 20, a first-stage preamplifier 31, an nth-stage preamplifier 3n, a power amplifier 30, a fiber combiner 302, a pump LD301, a gain fiber 303, a fiber output isolator 304, a first fiber beam splitter 410, a second fiber beam splitter 420, a signal processor 50 and a line width modulation driver 60.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the intended purpose, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments.
The description of the method flow in the present specification and the steps of the flow chart in the drawings of the present specification are not necessarily strictly performed by the step numbers, and the execution order of the method steps may be changed. Moreover, certain steps may be omitted, multiple steps may be combined into one step execution, and/or a step may be broken down into multiple step executions.
The invention provides a pulse fiber laser with narrow line width, which is provided with a feedback path and corresponds to the same laser, and the laser can be self-adaptively adjusted to have the narrowest line width matched with different laser peak powers. Therefore, the application requirements that the narrow-linewidth pulse fiber laser has high peak power and narrow linewidth at the same time can be met.
As shown in fig. 1, a narrow-linewidth pulse fiber laser according to an embodiment of the present invention includes, in a light transmission direction, sequentially arranged: a seed source 10, an intensity modulator 20, a multi-stage preamplifier (such as the first stage preamplifier 31 to the nth stage preamplifier 3n shown in fig. 1), and a power amplifier 30.
The laser is provided with a feedback adjusting component, the feedback adjusting component receives power monitoring signals of the input end and the output end of the power amplifier 30, and adjusts the line width of the seed light output by the seed source 10 and the pumping power of the power amplifier 30 based on the power monitoring signals.
According to some embodiments of the invention, as shown in fig. 1, the feedback adjustment assembly comprises: a first fiber splitter 410, a second fiber splitter 420, and a signal processor 50.
The first optical fiber splitter 410 is disposed upstream of the power amplifier 30, and is configured to collect a power monitoring signal at an input end of the power amplifier 30. The second fiber splitter 420 is disposed downstream of the power amplifier 30, and is used for collecting a power monitoring signal at an output end of the power amplifier 30.
The signal processor 50 is connected to the first fiber splitter 410, the second fiber splitter 420, the seed source 10 and the power amplifier 30, and the signal processor 50 receives the power monitoring signals collected by the first fiber splitter 410 and the second fiber splitter 420, and adjusts the line width of the seed light output by the seed source 10 and the pumping power of the power amplifier 30 based on the power monitoring signals.
In some embodiments of the present invention, as shown in fig. 1, the feedback regulation assembly further comprises: and a line width modulation driver 60, connected to both the seed source 10 and the signal processor 50, for adjusting the line width of the seed light output by the seed source 10 according to the received control signal of the signal processor 50.
According to some embodiments of the present invention, the linewidth modulation driver 60 is a driving circuit loaded on the seed source 10, and the linewidth of the seed light output from the seed source 10 is adjusted by changing the bandwidth of the modulation signal at the output terminal of the linewidth modulation driver 60.
In some embodiments of the present invention, as shown in fig. 1, power amplifier 30 includes: the optical fiber amplifier comprises a pump LD301, an optical fiber combiner 302, a gain optical fiber 303 and an optical fiber output isolator 304, wherein the signal processor 50 is connected with the pump LD301 to adjust the pump power of the pump LD301 based on a power monitoring signal.
The multistage preamplifier (e.g., the first-stage preamplifier 31 to the nth-stage preamplifier 3n shown in fig. 1) has a structure similar to that of the power amplifier 30, and is composed of a pump LD301, a fiber combiner 302, a gain fiber 303, and a fiber output isolator 304. The multi-stage preamplifier and power amplifier 30 is used for amplifying the power of the input pulse seed light step by step, so that the peak power of the output laser meets the application requirements.
According to some embodiments of the present invention, the pumping power of the pump LD301 is in multiple steps with stepwise increase. For example, the pump power increase mode of the output of the pump LD301 in the power amplifier 30 may be set to an m-step increase mode. The pump power is from 0 to the maximum pump power P capable of being outputpmaxIs divided into m orders, m is a positive integer, and m is more than 0 and less than or equal to 10. Each step of pump power increase from the previous step
And (4) tile.
In some embodiments of the present invention, the first fiber splitter 410 and the second fiber splitter 420 each comprise: an input port (i.e., port 1 shown in fig. 1), an output port (i.e., port 2 shown in fig. 1), and a collection port (i.e., port 3 shown in fig. 1), and the signal processor 50 obtains power monitoring signals from the collection ports of the first fiber splitter 410 and the second fiber splitter 420.
As shown in fig. 1, a first fiber splitter 410 is connected between the final stage preamplifier (nth stage preamplifier 3n) and the input end of the power amplifier 30, and a second fiber splitter 420 is connected to the output end of the power amplifier 30. The splitting ratio of the two optical fiber beam splitters is 1: 999. the forward transmission laser enters from port 1 and outputs from port 2 of the fiber splitter. The first fiber splitter 410 and the second fiber splitter 420 are connected to the signal processor 50 at ports 3, respectively.
According to some embodiments of the inventionThe sub source 10 is a DFB type single frequency semiconductor laser, and outputs continuous seed light. The intensity modulator 20 is LiNbO3And the electro-optical modulator modulates the input continuous seed light into pulse seed light with the pulse width within a preset range and then inputs the pulse seed light into the multistage preamplifier. For example, the intensity modulator 20 may modulate the input continuous seed light into pulse seed light having a pulse width of several ns to several tens of ns.
According to the control method of the narrow-linewidth pulse fiber laser, the control method is used for adjusting and controlling the linewidth and the power of the laser output by the narrow-linewidth pulse fiber laser, as shown in fig. 2, the control method includes:
s100, starting a laser, and outputting continuous seed light with a preset line width by a seed source under the control of a line width modulation driver;
s200, outputting pulse seed light by the continuous seed light through an intensity modulator;
s300, performing step-by-step power amplification on the pulse seed light through a multi-stage preamplifier and a power amplifier;
s400, the signal processor simultaneously monitors power monitoring signals collected by the first optical fiber beam splitter and the second optical fiber beam splitter;
s500, the signal processor adjusts the line width of the seed light output by the seed source and the pumping power of the power amplifier based on the power monitoring signal.
According to some embodiments of the invention, step S500 comprises:
s510, judging whether the return light power is linearly increased or not based on power monitoring signals collected from the first optical fiber beam splitter and the second optical fiber beam splitter;
s521, if the return light power is linearly increased, controlling a pumping LD in the power amplifier to increase the pumping power by one order;
and S522, if the return light power does not increase linearly any more, controlling the pump power to be unchanged, and simultaneously controlling the line width to drive the modulator to widen the line width of the seed light output by the seed source until the monitored return light power returns to a linear increasing state.
The detailed working modes of the narrow-linewidth pulse fiber laser are as follows:
the narrow-linewidth pulse fiber laser is normally turned on, and the seed light outputs continuous seed light with a linewidth of Δ v under the control of the linewidth modulation driver 60. The continuous seed light outputs pulsed seed light via the intensity modulator 20. The pulse seed light is subjected to power amplification step by step through n stages of preamplifiers and the final power amplifier 30. The return optical power returned by the first fiber splitter 410 and the laser optical power returned by the second fiber splitter 420 are simultaneously monitored by the signal processor 50.
If the return light power is linearly increased, the pump LD301 in the power amplifier 30 is controlled to increase the pump power by one order; if the optical return power does not increase linearly any more but increases abruptly with a large non-linearity, the pump power is controlled not to increase, and the linewidth modulation driver 60 is controlled to widen the linewidth of the seed source 10 until the optical return power returns to the linear increasing state.
Therefore, the state of the narrowest line width can be automatically found for the same laser under different peak power states through the automatic feedback process.
The invention has the advantages that:
by forming a feedback path, the lasers can be adaptively adjusted to have the narrowest linewidth matching different peak laser powers, corresponding to the same laser. Therefore, the application requirement that the narrow-linewidth pulse fiber laser has high peak power and narrow linewidth at the same time can be met.
A narrow-linewidth pulse fiber laser and a control method thereof according to the present invention are described in detail below in one specific embodiment with reference to the accompanying drawings. It is to be understood that the following description is only exemplary in nature and should not be taken as a specific limitation on the invention.
As shown in fig. 1, the narrow-linewidth pulse fiber laser includes a seed source 10, an intensity modulator 20, and a multi-stage fiber amplifier (including first-stage preamplifiers 31, …, an nth-stage preamplifier 3n, and a power amplifier 30) in this order along the forward transmission direction of light.
The seed source 10 is a DFB single-frequency semiconductor laser, and outputs seed light with a continuous light output mode. The laser wavelength is 1550nm, and the output power is more than or equal to 20 mW.
The linewidth of the seed light is controlled by a linewidth modulation driver 60. The line width modulation driver 60 is a driving circuit loaded on the seed source 10, and changes the line width of the seed light by changing the bandwidth of the modulation signal at the output end of the line width modulation driver 60. The initial line width is less than or equal to 10 kHz.
The seed light having the specific line width described above enters the intensity modulator 20.
The intensity modulator 20 is LiNbO3And the electro-optical modulator modulates the input continuous seed light into pulse seed light with the pulse width of 10ns, and then the pulse seed light enters the multistage optical fiber amplifier.
The multistage fiber amplifier consists of two stages of preamplifiers and a final stage of power amplifier 30. The multistage optical fiber amplifier has a similar structure and is composed of a pump LD301, an optical fiber combiner 302, a gain optical fiber 303 and an optical fiber output isolator 304. The multistage optical fiber amplifier is used for amplifying the power of input pulse seed light stage by stage so that the peak power of output laser meets the application requirement.
A first optical fiber splitter 410 is connected between the 2 nd stage preamplifier and the optical fiber combiner 302 of the power amplifier 30, and a second optical fiber splitter 420 is connected at the output end of the optical fiber output isolator 304 of the power amplifier 30. The splitting ratio of the two optical fiber beam splitters is 1: 999. the forward laser light enters from port 1 and exits from port 2 of the first fiber splitter 410 and the second fiber splitter 420. The ports 3 of the first fiber splitter 410 and the second fiber splitter 420 are connected to the signal processor 50, respectively.
The signal processor 50 receives the return optical power monitor signal from port 3 of the first fiber splitter 410 and receives the return laser power monitor signal from port 3 of the second fiber splitter 420. The signal processor 50 is connected to the line width modulation driver 60 and the pump LD301 in the power amplifier 30.
The maximum pump power output by the pump LD301 in the power amplifier 30 is 120W. The pump power is divided into 6 steps from 0 to 120W, and each step increases the pump power by 20W compared with the previous step. I.e., the first order output pump power 20W and the second order output pump power 40W ….
The working modes of the narrow-linewidth pulse fiber laser are as follows:
the narrow linewidth pulse fiber laser is normally turned on, and the seed light outputs continuous seed light with linewidth of 10kHz under the control of the linewidth modulation driver 60. The continuous seed light outputs pulsed seed light via the intensity modulator 20. The pulse seed light is subjected to step-by-step power amplification through a 2-stage fiber preamplifier and a final 1-stage power amplifier 30. The return optical power returned by the first fiber splitter 410 and the laser optical power returned by the second fiber splitter 420 are simultaneously monitored by the signal processor 50.
If the return light power is linearly increased, controlling the pump LD301 in the power amplifier 30 to increase the pump power by one order, for example, from 20W to 40W, monitoring the return light power again, and if the return light power is still linearly increased, continuing to increase the pump power by one order, for example, from 40W to 60W; if the return light power does not increase linearly any more but increases suddenly with a larger non-linear increase, the pump power is controlled to not increase, and the line width driving modulator is controlled to widen the line width of the seed source 10 until the monitored return light power returns to the linear increase state.
Therefore, the state of the narrowest line width can be automatically found for the same laser under different peak power states through the automatic feedback process.
While the invention has been described in connection with specific embodiments thereof, it is to be understood that it is intended by the appended drawings and description that the invention may be embodied in other specific forms without departing from the spirit or scope of the invention.
Claims (10)
1. The utility model provides a narrow linewidth pulse fiber laser which characterized in that, along the transmission direction of light, the laser is including setting gradually: the system comprises a seed source, an intensity modulator, a multi-stage preamplifier and a power amplifier;
the laser is provided with a feedback adjusting assembly, the feedback adjusting assembly receives power monitoring signals of the input end and the output end of the power amplifier, and adjusts the line width of seed light output by the seed source and the pumping power of the power amplifier based on the power monitoring signals.
2. The narrow-linewidth pulsed fiber laser of claim 1, wherein the feedback regulation component comprises:
the first optical fiber beam splitter is arranged at the upstream of the power amplifier and used for collecting a power monitoring signal at the input end of the power amplifier;
the second optical fiber beam splitter is arranged at the downstream of the power amplifier and used for collecting a power monitoring signal at the output end of the power amplifier;
and the signal processor is connected with the first optical fiber beam splitter, the second optical fiber beam splitter, the seed source and the power amplifier, receives power monitoring signals collected by the first optical fiber beam splitter and the second optical fiber beam splitter, and adjusts the line width of seed light output by the seed source and the pumping power of the power amplifier based on the power monitoring signals.
3. The narrow-linewidth pulsed fiber laser of claim 2, wherein the feedback regulation component further comprises: and the line width modulation driver is connected with the seed source and the signal processor and is used for adjusting the line width of the seed light output by the seed source according to the received control signal of the signal processor.
4. The narrow-linewidth pulse fiber laser according to claim 3, wherein the linewidth modulation driver is a driving circuit loaded on the seed source, and the linewidth of the seed light output by the seed source is adjusted by changing a bandwidth of a modulation signal at an output end of the linewidth modulation driver.
5. The narrow-linewidth pulsed fiber laser of claim 2, wherein the power amplifier comprises: the signal processor is connected with the pumping LD so as to adjust the pumping power of the pumping LD based on the power monitoring signal.
6. The narrow-linewidth pulsed fiber laser of claim 5, wherein the pump power of the pump LD is in multiple steps with stepwise increases.
7. The narrow-linewidth pulsed fiber laser of claim 2, wherein the first fiber beam splitter and the second fiber beam splitter each comprise: the signal processor acquires the power monitoring signals from the acquisition ports of the first optical fiber beam splitter and the second optical fiber beam splitter.
8. The narrow-linewidth pulsed fiber laser of claim 2, wherein the seed source is a DFB type single-frequency semiconductor laser outputting continuous seed light;
the intensity modulator is a LiNbO3 electro-optical modulator, and the input continuous seed light is modulated into pulse seed light with the pulse width within a preset range and then is input into the multistage preamplifier.
9. A control method of a narrow-linewidth pulse fiber laser, wherein the control method is used for the adjustment control of the linewidth and power of the laser output by the narrow-linewidth pulse fiber laser according to any one of claims 1 to 8, and the control method comprises:
starting a laser, and outputting continuous seed light with a preset line width by a seed source under the control of a line width modulation driver;
the continuous seed light passes through an intensity modulator to output pulse seed light;
the pulse seed light is subjected to step-by-step power amplification through a multi-stage preamplifier and a power amplifier;
the signal processor simultaneously monitors power monitoring signals collected by the first optical fiber beam splitter and the second optical fiber beam splitter;
and the signal processor adjusts the line width of the seed light output by the seed source and the pumping power of the power amplifier based on the power monitoring signal.
10. The method for controlling a narrow-linewidth pulse fiber laser according to claim 9, wherein the signal processor adjusts a linewidth of the seed light output by the seed source and a pump power of a power amplifier based on the power monitoring signal, and includes:
judging whether the return light power is linearly increased or not based on the power monitoring signals collected from the first optical fiber beam splitter and the second optical fiber beam splitter;
if the return light power is linearly increased, controlling a pumping LD in the power amplifier to increase the pumping power by one order;
and if the return light power does not increase linearly any more, controlling the pumping power to be unchanged, and simultaneously controlling the line width driving modulator to widen the line width of the seed light output by the seed source until the monitored return light power returns to the linear increasing state.
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