Fiber laser with power and spectrum monitoring functions

Abstract

The invention relates to the technical field of laser power monitoring, and discloses an optical fiber laser with a power and spectrum monitoring function, which comprises a seed source, a phase modulator, an optical splitter, a power amplification unit, a frequency multiplication module, a color separator and a power monitoring unit, a part of light output by the seed source is proportionally split to the power monitoring unit through the optical splitter, the remaining laser continues to enter the power amplification unit, and the frequency doubling module and the color splitter are located behind the power amplification unit. The power monitoring unit of the optical fiber laser comprises the photoelectric detector, the circulator, the grating and the first temperature controller, the laser reflected by the grating is tuned through the first temperature controller, the change condition of the tuned laser power along with the temperature is monitored, and the abnormal state type of a seed source is judged; and carrying out targeted coping processing according to the abnormal state type.

Description

Technical Field

[0001] The present application relates to the technical field of laser power monitoring, and in particular to a fiber laser with power and spectrum monitoring functions. Background Art

[0002] like Figure 1 As shown, the current fiber laser includes a seed source 11 and a power amplifier unit 13. A beam splitter 12 and a photodetector 21 are then provided for power monitoring. Specifically, the beam splitter 12 divides a portion of the light output from the seed source 11 into a proportional portion and sends it to the photodetector 21. The remaining light continues to enter the power amplifier unit 13. The photodetector 21 then monitors the light and infers whether the fiber laser has power anomalies.

[0003] DFB lasers offer advantages such as high single-mode stability, narrow linewidth, and fiber compatibility, making them widely used in fiber-optic communications, fiber-optic sensing, spectroscopy, and other fields. However, the spectral width of the laser's direct output is generally several hundred kHz, and its spectrum cannot be naturally broadened during amplification. This can lead to severe SBS nonlinear effects during power amplification, which can easily damage downstream optical devices and thus limit the power amplification of the fiber laser.

[0004] To suppress the SBS effect and improve the power amplification capability of fiber lasers, a seed source is currently commonly used to broaden and modulate a fiber laser seed source with a spectral width of several kHz to a fiber laser seed source with a spectral width of several hundred GHz. Subsequent power amplification can significantly increase the amplification power of the fiber laser. Currently, this polarization-maintaining infrared light source based on phase modulation broadening is the key fundamental frequency light source for frequency doubling to generate continuous and pulsed short-wavelength lasers. It determines the stability of the generated short-wavelength laser.

[0005] However, in the actual operation of such phase-modulated stretched high-power fiber lasers, electrical instabilities in electrically charged components such as circuit boards and optical devices can cause changes in the spectral shape. For example, central wavelength drift, changes in the stretched bandwidth, and power amplitude fluctuations can occur. Figure 1 The fiber laser with power and spectrum monitoring function shown can only monitor the power amplitude fluctuation of the seed source of the fiber laser, but cannot monitor the center wavelength drift of the seed source and the change of the broadened bandwidth. However, in the actual application of short-wavelength laser fiber lasers, the center wavelength drift of the seed source and the change of the broadened bandwidth of the seed source will seriously affect the stability of the short-wavelength laser generated by subsequent frequency doubling. This will lead to Figure 1 The monitoring data cannot reflect the true stability of the laser and trigger the necessary alarms.

[0006] In summary, there is an urgent need for a new type of fiber laser with power and spectrum monitoring functions, which can not only monitor the power amplitude fluctuation of the seed source, but also monitor the central wavelength drift and the changes in the broadened bandwidth of the seed source, so as to provide timely feedback on the abnormal problems of the current fiber laser seed source and take timely response measures. Summary of the Invention

[0007] In view of this, the present application provides a fiber laser with power and spectrum monitoring functions to solve the technical problem that the fiber laser cannot timely feedback the specific abnormal situation of the seed source of the current fiber laser, and thus cannot take appropriate countermeasures.

[0008] The technical solutions proposed in this application are as follows:

[0009] The present application provides a fiber laser with power and spectrum monitoring functions, comprising: a seed source, a phase modulator, a spectrometer, a power amplifier unit, a frequency doubling module, a color separator, and a power monitoring unit. The phase modulator tunes the broadened bandwidth of the laser light generated by the seed source to meet the broadening requirements of subsequent frequency doubling. The spectrometer then divides a portion of the light output by the seed source into a proportional portion and sends it to the power monitoring unit. The remaining laser light continues to enter the power amplifier unit. The frequency doubling module and the color separator are located after the power amplifier unit. The frequency doubling module performs frequency doubling on the power-amplified laser light to obtain short-wavelength laser light. The color separator separates the short-wavelength laser light from infrared light to obtain pure short-wavelength laser light.

[0010] In addition to a photodetector, the power monitoring unit of the fiber laser of the present application also includes a circulator, a grating and a first temperature controller. The grating is located inside the first temperature controller, and the grating is based on the central wavelength of the seed source in a normal state. The grating can be controlled by the first temperature controller to be tuned within a preset limited range to reflect laser light in a specific wavelength range.

[0011] The specific laser monitoring procedure is as follows: the laser generated by the seed source passes through the phase modulator to tune the broadened bandwidth of the seed source to meet the broadening requirements of the subsequent frequency doubling, and then passes through the optical splitter to split a part of the light to the power monitoring unit. The laser first enters the first entrance of the circulator, then outputs from the second exit of the circulator, then enters the grating, and after reflection from the grating returns to the second entrance of the circulator, it is output from the third exit of the circulator and enters the photodetector.

[0012] Because the grating designed in this application maintains the same central wavelength of the seed source in its initial state and normal state, and can only reflect laser light within the specific wavelength range of the seed source in its normal state, when the fiber laser seed source is in a normal state, the power monitored by the photodetector will not be abnormal. At this time, the temperature-power curve of the laser light reflected by the grating will also be normal, and the temperature-power curve at this time will be set to the preset temperature-power curve.

[0013] If the seed source is in an abnormal state, the laser reflected by the grating is tuned by the first temperature controller, the change of the tuned laser power with temperature is monitored, and a new temperature-power line is generated. The tuned first temperature-power line is compared with the preset temperature-power line to determine the abnormal state type of the seed source, and then targeted response and processing are carried out according to the abnormal state type.

[0014] For example, when the central wavelength of a fiber laser seed source drifts, the seed source's spectrum can be normalized by adjusting the temperature of the seed source's environment. When the seed source's bandwidth changes, the seed source's spectrum can be normalized by retuning the phase modulator.

[0015] By providing the novel fiber laser with power and spectrum monitoring functions of the present application, it is possible to solve the technical problem that current fiber lasers are unable to timely distinguish, feedback and respond to corresponding seed source anomalies when the central wavelength of the fiber laser seed source drifts and the broadened bandwidth changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly express the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is a schematic diagram of the structure of an existing fiber laser with power and spectrum monitoring functions;

[0018] Figure 2 This is a schematic diagram of the first structure of the fiber laser with power and spectrum monitoring functions provided by this application;

[0019] Figure 3 is a spectrum diagram of a fiber laser seed source in a normal state according to an embodiment of the present application;

[0020] Figure 4 is a temperature-power diagram under normal conditions according to an embodiment of the present application;

[0021] Figure 5 1 is a temperature-power comparison diagram of a normal state and a first abnormal state according to an embodiment of the present application;

[0022] Figure 6 3. This is a spectrum comparison diagram of a fiber laser seed source in a normal state and a second abnormal state according to an embodiment of the present application;

[0023] Figure 7 2. It is a temperature-power comparison diagram of a normal state and a second abnormal state according to an embodiment of the present application;

[0024] Figure 8 3. It is a spectrum comparison diagram of the fiber laser seed source in a normal state and a third abnormal state according to an embodiment of the present application;

[0025] Figure 9 Temperature-power comparison diagram of the normal state and the third abnormal state according to an embodiment of the present application;

[0026] Figure 10 This is a second structural schematic diagram of the fiber laser with power and spectrum monitoring functions provided by this application.

[0027] Reference numerals:

[0028] 11. Seed source; 12. Optical splitter; 13. Power amplifier; 14. Frequency multiplication module; 15. Color separator; 21. Photodetector; 22. Circulator; 23. Grating; 24. First temperature controller; 111. Phase modulator; 112. Second temperature controller. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solution of this application in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0030] In the description of this application, it should be noted that the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal connections between two components; they can refer to wireless connections or wired connections. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0032] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0033] like Figure 2 As shown, Figure 2 This is a schematic diagram of the first structure of the fiber laser with power and spectrum monitoring functions provided in this application. The fiber laser includes: a seed source 11, a phase modulator 111, a spectrometer 12, a power amplifier unit 13, a frequency doubling module 14, a color separator 15 and a power monitoring unit. The phase modulator tunes the broadened bandwidth of the laser generated by the seed source, and then divides a portion of the light output by the seed source 11 into the power monitoring unit in proportion through the spectrometer 12, and the remaining laser continues to enter the power amplifier unit 13. The frequency doubling module 14 and the color separator 15 are located behind the power amplifier unit 13. The frequency doubling module 14 performs frequency doubling processing on the power-amplified laser to obtain a short-wavelength laser. The color separator 15 separates the short-wavelength laser and infrared light to obtain a pure short-wavelength laser.

[0034] The difference between the fiber laser with power and spectrum monitoring function of the present application and the existing short-wavelength laser fiber laser is that the power monitoring unit of the fiber laser of the present application includes a circulator 22, a grating 23 and a first temperature controller 24 in addition to the photodetector 21. The first port of the circulator 22 is connected to the spectrometer 12, the second port of the circulator 22 is connected to the grating 23, and the third port of the circulator 22 is connected to the power monitor 21. The grating 23 is located inside the first temperature controller 24, and the grating 23 is based on the central wavelength of the seed source 11 in the normal state. The grating 23 can be controlled by the first temperature controller 24 to be tuned within a preset limited temperature range to reflect laser light in a specific wavelength range. Figure 2 As shown, the laser generated by the seed source 11 is divided into the power monitoring unit through the spectrometer 12. The laser first enters the first entrance of the circulator 22, then outputs from the second exit of the circulator 22, and then enters the grating 23. After being reflected by the grating 23 and returning to the second entrance of the circulator 22, the laser is output from the third exit of the circulator 22 and enters the photodetector 21.

[0035] Furthermore, the phase modulator 111 is a polarization-maintaining phase modulator. Usually, only a polarization-maintaining phase modulator can meet the working requirements of the subsequent frequency multiplication processing by the frequency multiplication module 14 .

[0036] Furthermore, the grating 23 is a narrow-band high-reflection grating. Usually, only a narrow-band high-reflection grating can meet the working requirements of the subsequent frequency doubling module 14 for frequency doubling processing.

[0037] like Figure 3 As shown, Figure 3 This is a spectrum diagram of the fiber laser seed source in the embodiment of the present application in normal state. Since the initial state of the grating 23 designed in the present application is consistent with the central wavelength of the seed source 11 in the preset normal state, and the wavelength of the laser is in the preset range, that is, the grating 23 at this time can only reflect the laser in the specific wavelength range of the seed source in the normal state. When the fiber laser seed source is in normal state, the spectrum diagram of the grating 23 and the seed source 11 are consistent, and both are consistent. Figure 3 The spectrum diagram of the laser is the same as shown in FIG. In this case, the power monitored by the photodetector will not be abnormal.

[0038] like Figure 4 As shown, Figure 4 This is a temperature-power diagram under normal conditions of an embodiment of the present application. Specifically, when the seed source 11 of the fiber laser is in a normal state, after the laser reflected by the grating 23 is tuned by adjusting the first temperature controller 24, the temperature-power diagram generated by the grating 23 reflecting the laser to the photodetector 21 is generated. The temperature-power line at this time is defined as a preset temperature-power line. As shown by the temperature-power line B1, when the temperature is 25°C, the power of the laser reflected by the grating 23 is the highest, which is 5mw at this time. The laser reflected by the grating 23 can be tuned by the first temperature controller 24, and the change in the laser power after tuning can be monitored. If the first temperature controller 24 tunes the laser reflected by the grating 23, the temperature-power line after tuning is defined as the first temperature-power line, and the change in the laser power after tuning is the same as Figure 4 The temperature-power diagram shown remains consistent. At this time, the seed source 11 of the fiber laser has no abnormality and can be started normally.

[0039] like Figure 5 As shown, Figure 5 This is a temperature-power comparison diagram of the normal state and the first abnormal state of the embodiment of the present application. In this embodiment, when the highest power ratio of the first temperature-power line is Figure 4When the maximum power of the preset temperature-power line shown is high or low, the change rate of the first temperature-power line is consistent with the change rate of the preset temperature-power line, and the central wavelength of the first temperature-power line does not drift, the abnormal state type of the seed source 11 is determined to be power amplitude fluctuation.

[0040] In this embodiment, after adjusting the laser reflected by the grating 23 by adjusting the first temperature controller 24, the temperature-power diagram generated by the laser reflected by the grating 23 to the photodetector 21 can be used to determine that the abnormal state type of the seed source 11 is power amplitude fluctuation. Specifically, if the spectrum diagram of the seed source 11 of the fiber laser is different from the spectrum diagram in the normal state Figure 1 As shown by the temperature-power line B1, in the normal state of this embodiment, when the temperature is 25 degrees Celsius, the power of the laser reflected by the grating 23 is also the highest, which is 5mw. The laser reflected by the grating 23 can be tuned by the first temperature controller 24, and the change in the laser power after tuning can be monitored. At this time, the power drops by 0.5mw for every 1°C increase or decrease in temperature. In the first abnormal state, the temperature-power diagram of the laser reflected by the grating 23 is different from that in the normal state of the seed source 11. When the seed source 11 is in an abnormal state, if the first temperature controller 24 tunes the laser reflected by the grating 23, the change in the power of the laser reflected by the tuned grating 23 is the same as that in the normal state. Figure 4 The temperature-power diagram shown is inconsistent. At this point, the seed source 11 of the fiber laser has become abnormal. For example, as shown by the temperature-power line B3, when the temperature is 25 degrees Celsius, the power of the laser reflected by the grating 23 is the highest. At this time, the maximum power is 6mw. For every 1°C increase or decrease in temperature, the power decreases by 0.6mw. As shown by the temperature-power line B2, when the temperature is 25 degrees Celsius, the power of the laser reflected by the grating 23 is the highest. At this time, the maximum power is 4mw. For every 1°C increase or decrease in temperature, the power decreases by 0.4mw. At this point, the maximum power of the first abnormal state becomes higher or lower, and the above monitoring results can be used to determine that the seed source 11 has a power amplitude fluctuation, and targeted adjustments are required before it can be turned on again.

[0041] like Figure 6 As shown, Figure 6 This is a spectrum comparison diagram of the fiber laser seed source in a normal state and a second abnormal state according to an embodiment of the present application. In this embodiment, when the maximum power of the first temperature-power line is higher or lower than the maximum power of the preset temperature-power line, the rate of change of the first temperature-power line is inconsistent with the rate of change of the preset temperature-power line, and the central wavelength of the first temperature-power line does not drift, the abnormal state type of the seed source 11 is determined to be a change in broadening.

[0042] Specifically, as shown by spectrum line A2 in this embodiment, when the stretching increases, the wavelength changes by the same amount from the center wavelength to the left and right sides, compared to the normal stretching state, the spectrum change value will become smaller, that is, the spectrum changes will become slower. As shown by spectrum line A3 in this embodiment, when the stretching decreases, the wavelength changes by the same amount from the center wavelength to the left and right sides, compared to the normal stretching state, the spectrum change value will become larger, that is, the spectrum changes will become more rapid.

[0043] Figure 7 In the normal state and the second abnormal state of the seed source of the embodiment of the present application, after adjusting the first temperature controller 24 to tune the laser reflected by the grating 23, the temperature-power diagram (which can be referred to as the temperature-power comparison diagram of the normal state and the second abnormal state) generated by the laser reflected by the grating 23 to the photodetector 21 is shown. When the broadening becomes wider, compared to the normal broadening state, when the spectrum of the laser reflected by the grating 23 changes from the center wavelength to the sides, the corresponding relative change in the light intensity amplitude will become smaller. At the same time, as shown by the temperature-power line B4, the monitored power will also be relatively smaller than the change at the same temperature in the normal state. When the broadening becomes narrower, compared to the normal broadening state, when the spectrum of the laser reflected by the grating 23 changes from the center wavelength to the sides, the corresponding relative change in the light intensity amplitude will become larger, as shown by the temperature-power line B5, and the power change relative to the temperature will also be relatively larger. At the same time, compared to the first abnormal state, the rate of change of power with temperature remains unchanged. In this abnormal state, the rate of change of power with temperature will change. Based on this, the first abnormal state and the second abnormal state can be distinguished.

[0044] After it is determined through the above monitoring results that the broadening of the seed source 11 has changed, the phase modulator 111 can be adjusted to make the spectrum line of this embodiment consistent with the normal state before starting the device.

[0045] like Figure 8 As shown, Figure 8 The following is a comparison of the spectra of the fiber laser seed source 11 in a normal state and in the third abnormal state. In this embodiment, when the maximum power of the first temperature-power line is consistent with the maximum power of the preset temperature-power line, the rate of change of the first temperature-power line is consistent with the rate of change of the preset temperature-power line, and the center wavelength of the first temperature-power line drifts, the abnormal state of the seed source 11 is determined to be center wavelength drift.

[0046] Specifically, as shown by spectrum line A4, the central wavelength of seed source 11 shifts to the left toward a smaller central wavelength. As shown by spectrum line A5, the central wavelength of seed source 11 shifts to the right toward a larger central wavelength. This shift in the central wavelength of seed source 11 causes a change in the temperature at which the laser light reflected by grating 23 reaches its maximum power.

[0047] Figure 9 This is a temperature-power comparison diagram for the normal state and the third abnormal state of an embodiment of the present application. Specifically, after adjusting the first temperature controller 24 to tune the laser reflected by the grating 23, the temperature-power diagram generated by the laser reflected by the grating 23 to the photodetector 21. As shown by the temperature-power line B1, when the seed source 11 is in a normal state, at a temperature of 25°C, the laser reflected by the grating 23 is at the highest power state. As shown by the temperature-power line B6, when the center wavelength of the seed source 11 drifts to the left, at a temperature of 24°C, the laser reflected by the grating 23 is at the highest power state. That is, in a normal state, when the temperature is adjusted from 25°C to 24°C, the power should decrease, but at this time, the power continues to increase. As shown by the temperature-power line B7, when the center wavelength of the seed source 11 drifts to the right, at a temperature of 26°C, the laser reflected by the grating 23 is at the highest power state. That is, under normal conditions, when the temperature is adjusted from 25°C to 26°C, the power should decrease, but in this case, the power continues to increase. This can be used to distinguish the third abnormal state from the first and second abnormal states.

[0048] Furthermore, Figure 10 This is a second structural diagram of the fiber laser with power and spectrum monitoring function provided by this application. Figure 2 The fiber laser further includes a second temperature controller 112, which is disposed on the periphery of the seed source 11. If the above monitoring results indicate that the center wavelength of the seed source 11 is drifting, the second temperature controller 112 can be adjusted accordingly to adjust the temperature of the environment surrounding the seed source 11, so that the spectrum lines of this embodiment are consistent with the normal state before the device is turned on.

[0049] Furthermore, the second temperature controller 112 is a high-precision temperature control device, i.e., the temperature control accuracy of the second temperature controller 112 is higher than that of the first temperature controller 24. This is because the accuracy requirements for the temperature control device are different when performing anomaly comparison on the laser light reflected by the grating 23 than when adjusting the abnormal state of the seed source 11 to a normal state. The temperature control accuracy requirements for performing anomaly comparison on the laser light reflected by the grating 23 are relatively lower, and only a high-precision temperature control device can adjust the seed source 11, which has a center wavelength drift problem, to a normal state.

[0050] Compared with the current fiber laser with power monitoring function, it can only monitor the power amplitude fluctuation of the seed source, or even if it can monitor the change of the center wavelength drift and the broadened bandwidth, it cannot be distinguished. The present application provides a fiber laser with power and spectrum monitoring function. By comparing with the temperature-power diagram of the seed source under normal conditions, it can not only monitor the power amplitude fluctuation of the seed source, but also monitor the center wavelength drift and the change of the broadened bandwidth of the seed source, and can distinguish various abnormalities. It will be able to timely feedback the abnormal problem of the seed source of the current fiber laser, and then by targeted adjustment of the phase modulator 111 or the second temperature controller 112, it is possible to deal with the abnormal conditions of the seed source such as the broadened bandwidth change and the center wavelength drift of the seed source respectively.

[0051] Furthermore, the center wavelength of the seed source of the fiber laser of the present application can be infrared light in the 1030nm band or the 1064nm band, with a spectral width range of 0.1nm-5nm and a power generally in the range of 5mW-100mW. In this method, by setting the center wavelength of the first laser to 1030nm or 1064nm, subsequent frequency doubling can be performed to output short-wavelength laser light, which can be widely used in various industrial scenarios.

[0052] It should be noted that the specific values ​​for spectrum, power, and temperature described above are examples of specific embodiments. These values ​​may vary depending on the specific model of the fiber laser provided. Unless specifically limited or described in the present application, these values ​​do not constitute limitations on the claims of this application. Furthermore, although the exemplary embodiments and their advantages have been described in detail, those skilled in the art may make various changes, substitutions, and modifications to these embodiments without departing from the spirit and scope of protection of this application, and such modifications and variations are within the scope defined herein.

Claims

1. A fiber laser with power monitoring function, characterized in that: include: A seed source (11), a phase modulator (111), an optical splitter (12), a power amplification unit (13), a frequency multiplication module (14), a color splitter (15) and a power monitoring unit; The phase modulator tunes the broadened bandwidth of the laser light generated by the seed source, and then divides a portion of the light output by the seed source (11) into a power monitoring unit in proportion through an optical splitter (12), and the remaining laser light continues to enter the power amplification unit (13); The power monitoring unit comprises a circulator (22), a grating (23) and a power monitor (21), wherein a first port of the circulator (22) is connected to the optical splitter (12), a second port of the circulator (22) is connected to the grating (23), a third port of the circulator (22) is connected to the power monitor (21), and the temperature controller (24) is connected to the grating (23); The grating (23) is located inside the first temperature controller (24). The grating (23) is based on the central wavelength of the seed source (11) in a normal state. The first temperature controller (24) controls the grating (23) to be tuned within a preset limited temperature range to reflect laser light in a specific wavelength range.

2. The fiber laser with power monitoring function according to claim 1, characterized in that: The temperature-power line when the seed source (11) is in a normal state is defined as a preset temperature-power line, the laser reflected by the grating (23) is tuned by the temperature controller (24), the change of the laser power after tuning is monitored, and a first temperature-power line is generated. The tuned first temperature-power line is compared with the preset temperature-power line to determine the abnormal state type of the seed source.

3. The fiber laser with power monitoring function according to claim 2, characterized in that: The laser light reflected by the grating (23) has a central wavelength of the seed source consistent with that in the initial state and the normal state, and the wavelength of the laser light is within a preset range.

4. The fiber laser with power monitoring function according to claim 3, characterized in that: Based on the relationship between the maximum power of the first temperature-power line and the maximum power of the preset temperature-power line and the relationship between the change rate of the first temperature-power line and the change rate of the preset temperature-power line, it is determined whether the seed source is abnormal and the type of abnormality of the seed source.

5. The fiber laser with power monitoring function according to claim 4, characterized in that: When the maximum power of the first temperature-power line is higher or lower than the maximum power of the preset temperature-power line, the change rate of the first temperature-power line is consistent with the change rate of the preset temperature-power line, and the central wavelength of the first temperature-power line does not drift, the abnormal state type of the seed source is determined to be power amplitude fluctuation.

6. The fiber laser with power monitoring function according to claim 4, characterized in that: When the maximum power of the first temperature-power line is higher or lower than the maximum power of the preset temperature-power line, the change rate of the first temperature-power line is inconsistent with the change rate of the preset temperature-power line, and the central wavelength of the first temperature-power line does not drift, the abnormal state type of the seed source is determined to be a change in broadening.

7. The fiber laser with power monitoring function according to claim 4, characterized in that: When the maximum power of the first temperature-power line is consistent with the maximum power of the preset temperature-power line, the change rate of the first temperature-power line is consistent with the change rate of the preset temperature-power line, and the central wavelength of the first temperature-power line drifts, the abnormal state type of the seed source is determined to be the drift of the central wavelength.

8. The fiber laser with power monitoring function according to claim 4, characterized in that: When the first temperature-power line is consistent with the preset temperature-power line, it is determined that the seed source is normal.

9. The fiber laser with power monitoring function according to claim 1, characterized in that: The invention also includes a second temperature controller (112), which is arranged on the periphery of the seed source (11).

10. The fiber laser with power monitoring function according to claim 9, characterized in that: The temperature control accuracy of the second temperature controller (112) is higher than the temperature control accuracy of the first temperature controller (24).

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