Optical fiber laser with power and spectrum monitoring function

Abstract

This application relates to the field of laser power monitoring technology and discloses a fiber laser with both power and spectral monitoring functions. The fiber laser includes a seed source, a phase modulator, a beam splitter, a power amplifier unit, a frequency doubling module, a dichroic separator, and a power monitoring unit. The beam splitter proportionally separates a portion of the light output from the seed source to the power monitoring unit, while the remaining laser light continues into the power amplifier unit. The frequency doubling module and dichroic separator are located after the power amplifier unit. In addition to a photodetector, the power monitoring unit of the fiber laser includes a circulator, a grating, and a first temperature controller. The first temperature controller tunes the laser light reflected from the grating, monitors the change in laser power with temperature after tuning, determines the type of abnormal state of the seed source, and then takes targeted measures based on the type of abnormal state.

Description

Technical Field

[0001] This application relates to the field of laser power monitoring technology, and in particular to a fiber laser with both power and spectral monitoring functions. Background Technology

[0002] like Figure 1 As shown, the current fiber laser includes a seed source 11 and a power amplification unit 13. Power monitoring is then performed by setting up a beam splitter 12 and a photodetector 21. Specifically, a portion of the light output from the seed source 11 is proportionally split by the beam splitter 12 and sent to the photodetector 21. The remaining light continues to enter the power amplification unit 13, and then the photodetector 21 monitors the power output to determine whether the fiber laser has experienced any power anomalies.

[0003] DFB lasers offer advantages such as high single-mode stability, narrow linewidth, and fiber optic compatibility, making them widely applicable in fiber optic communication, fiber optic sensing, and spectroscopy. However, the direct output spectral width of these lasers is typically several hundred kHz. During amplification, the spectrum cannot naturally broaden, leading to severe SBS nonlinear effects during power amplification. This can easily damage downstream optical devices, thus limiting the power amplification of the fiber laser.

[0004] To suppress the SBS effect and improve the power amplification capability of fiber lasers, a common approach is to broaden and modulate a fiber laser seed source with a spectral width in the kHz range to a spectral width in the hundreds of GHz range before subsequent power amplification. This significantly increases the amplification power of the fiber laser. Currently, this phase-modulation broadened polarization-maintaining infrared light source is a key fundamental frequency 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 this phase-modulated broadened high-power fiber laser, electrical instability issues in charged components such as circuit boards and optical devices can lead to changes in the spectral shape. For example, the center wavelength may drift, the broadened bandwidth may change, and the power amplitude may fluctuate. Figure 1 The fiber laser with power and spectral monitoring capabilities shown can only monitor the power amplitude fluctuations of its seed source, but cannot monitor changes in the seed source's center wavelength drift or broadened bandwidth. However, in practical applications of short-wavelength fiber lasers, changes in the seed source's center wavelength drift and broadened bandwidth will severely affect the stability of the subsequent frequency-doubled short-wavelength laser. This, in turn, leads to... Figure 1 The monitoring data cannot reflect the true stability of the laser or trigger the necessary alarms.

[0006] In summary, there is an urgent need for a new type of fiber laser with both power and spectral monitoring capabilities. This laser should be able to monitor not only the power amplitude fluctuations of the seed source, but also the center wavelength drift and bandwidth changes of the seed source. This would allow for timely feedback on any seed source anomalies in the current fiber laser, enabling prompt responses and solutions. Summary of the Invention

[0007] In view of this, this application provides a fiber laser with power and spectral monitoring functions to solve the technical problem that the fiber laser cannot timely report the specific abnormal situation of the seed source due to the center wavelength drift and bandwidth broadening of the seed source, and therefore cannot take appropriate countermeasures.

[0008] The technical solution proposed in this application is as follows:

[0009] This application provides a fiber laser with both power and spectral monitoring functions. The fiber laser includes a seed source, a phase modulator, a beam splitter, a power amplifier unit, a frequency doubling module, a dichroic separator, and a power monitoring unit. The phase modulator tunes the bandwidth of the laser generated by the seed source to meet the bandwidth requirements of subsequent frequency doubling. The beam splitter proportionally separates a portion of the light output from the seed source to the power monitoring unit, while the remaining laser continues into the power amplifier unit. The frequency doubling module and dichroic separator are located after the power amplifier unit. The frequency doubling module performs frequency doubling on the amplified laser to obtain a short-wavelength laser. The dichroic separator separates the short-wavelength laser from the infrared light to obtain a pure short-wavelength laser.

[0010] In addition to a photodetector, the power monitoring unit of the fiber laser in this 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 center wavelength of the seed source under normal conditions. The first temperature controller can control the grating to be tuned within a preset 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 is tuned by the phase modulator to broaden the bandwidth of the seed source to meet the broadening requirements of the subsequent frequency doubling. Then, after passing through the beam splitter, a portion of the light is sent to the power monitoring unit. The laser first enters the first inlet of the circulator, then exits from the second outlet of the circulator, then enters the grating, and after being reflected by the grating, returns to the second inlet of the circulator, and then exits from the third outlet of the circulator, entering the photodetector.

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

[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 measures are taken according to the abnormal state type.

[0014] For example, when the center wavelength of a fiber laser seed source drifts, the spectrum of the seed source can be restored to normal by adjusting the temperature of the environment in which the seed source is located. When the bandwidth of the seed source broadens, the spectrum of the seed source can be restored to normal by readjusting the phase modulator.

[0015] By providing the novel fiber laser with power and spectral monitoring functions of this application, the technical problem that current fiber lasers cannot promptly distinguish, respond to, and deal with corresponding seed source anomalies when the center wavelength of the seed source of a fiber laser drifts and the bandwidth broadens can be solved. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of an existing fiber laser with both power and spectral monitoring capabilities;

[0018] Figure 2 A first structural schematic diagram of the fiber laser with power and spectral monitoring functions provided in this application;

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

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

[0021] Figure 5 This is a temperature-power comparison diagram of the normal state and the first abnormal state according to the embodiments of this application;

[0022] Figure 6 This is a comparison diagram of the spectrum of the seed source of the fiber laser in normal state and the second abnormal state according to the embodiments of this application;

[0023] Figure 7 This is a temperature-power comparison diagram of the normal state and the second abnormal state according to the embodiments of this application;

[0024] Figure 8 This is a comparison diagram of the spectrum of the seed source of the fiber laser according to the embodiments of this application under normal state and under a third abnormal state;

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

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

[0027] Figure label:

[0028] 11. Seed source; 12. Spectrometer; 13. Power amplifier; 14. Frequency multiplier module; 15. Color separator; 21. Photodetector; 22. Circulator; 23. Grating; 24. First temperature controller; 111. Phase modulator; 112. Second temperature controller. Detailed Implementation

[0029] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort 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., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," 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 and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] Furthermore, the technical features involved in the different embodiments of this 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 first structural schematic diagram of the fiber laser with power and spectral monitoring functions provided in this application. The fiber laser includes: a seed source 11, a phase modulator 111, a beam splitter 12, a power amplification unit 13, a frequency doubling module 14, a dichroic separator 15, and a power monitoring unit. The phase modulator tunes the broadened bandwidth of the laser generated by the seed source. The beam splitter 12 proportionally separates a portion of the light output from the seed source 11 to the power monitoring unit, while the remaining laser continues into the power amplification unit 13. The frequency doubling module 14 and the dichroic separator 15 are located after the power amplification unit 13. The frequency doubling module 14 performs frequency doubling on the amplified laser to obtain a short-wavelength laser, and the dichroic separator 15 separates the short-wavelength laser from the infrared light to obtain a pure short-wavelength laser.

[0034] The difference between the fiber laser with power and spectral monitoring functions in this application and existing short-wavelength fiber lasers is that the power monitoring unit of the fiber laser in this application, in addition to a photodetector 21, also includes a circulator 22, a grating 23, and a first temperature controller 24. The first port of the circulator 22 is connected to the beam splitter 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 tuned within a preset temperature range based on the center wavelength of the seed source 11 under normal conditions, so as to reflect laser light in a specific wavelength range. Figure 2 As shown, the laser generated by the seed source 11 is split by the beam splitter 12 to the power monitoring unit. The laser first enters the first inlet of the circulator 22, then exits from the second outlet of the circulator 22, then enters the grating 23, and after being reflected by the grating 23, it returns to the second inlet of the circulator 22, and then exits from the third outlet of the circulator 22, entering the photodetector 21.

[0035] Furthermore, the phase modulator 111 is a bias-maintaining phase modulator, and typically only a bias-maintaining phase modulator can meet the working requirements of the subsequent frequency doubling module 14 for frequency doubling processing.

[0036] Furthermore, the grating 23 is a narrowband high-reflectivity grating, and typically only narrowband high-reflectivity gratings 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 seed source of the fiber laser in its normal state according to an embodiment of this application. Since the initial state of the grating 23 designed in this application is consistent with the center wavelength of the seed source 11 in the preset normal state, and the wavelength of the laser is within a preset range, that is, the grating 23 can only reflect the laser in that specific wavelength range where the seed source is located in the normal state. When the seed source of the fiber laser is in its normal state, the spectrum diagrams of the laser from the grating 23 and the seed source 11 are consistent, both being... Figure 3 The spectrum diagram of the laser shown is the same. At this time, the power detected by the photodetector will not be abnormal.

[0038] like Figure 4 As shown, Figure 4 This is a temperature-power graph under normal conditions according to an embodiment of this application. Specifically, when the seed source 11 of the fiber laser is in normal condition, after the laser reflected by the grating 23 is tuned by adjusting the first temperature controller 24, a temperature-power graph is generated on the photodetector 21 by the laser reflected by the grating 23. The temperature-power line at this time is defined as a preset temperature-power line, as shown in temperature-power line B1. When the temperature is 25°C, the power of the laser reflected by the grating 23 is the highest, at 5mW. The laser reflected by the grating 23 can be tuned by the first temperature controller 24, and the change in laser power after tuning can be monitored. If the first temperature controller 24 tunes the laser reflected by the grating 23, the tuned temperature-power line is defined as the first temperature-power line, and the change in laser power after tuning is related to... Figure 4 The temperature-power graph shown remains consistent. At this point, the seed source 11 of the fiber laser is not malfunctioning and can be powered on and operated 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 in an embodiment of this 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 is high or low, 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 does not drift, the abnormal state type of the seed source 11 is determined to be power amplitude fluctuation.

[0040] In this embodiment, the abnormal state type of the seed source 11 can be determined to be power amplitude fluctuation by adjusting the first temperature controller 24 to tune the laser reflected by the grating 23 and generating a temperature-power map on the photodetector 21. Specifically, if the spectrum of the seed source 11 of the fiber laser differs from its normal spectrum... Figure 1 As shown in temperature-power line B1, under normal conditions in this embodiment, the power of the laser reflected by grating 23 is highest at 25 degrees Celsius, reaching 5mW. The laser reflected by grating 23 can be tuned using the first temperature controller 24, and the change in laser power after tuning can be monitored. At this time, for every 1°C increase or decrease in temperature, the power decreases by 0.5mW. However, in the first abnormal state, the temperature-power diagram of the laser reflected by grating 23 differs from that under normal conditions of seed source 11. When seed source 11 is in an abnormal state, if the first temperature controller 24 tunes the laser reflected by grating 23, the change in the power of the laser reflected by grating 23 after tuning will differ from... Figure 4 The temperature-power graphs shown are inconsistent. At this point, the seed source 11 of the fiber laser has malfunctioned. For example, as shown in temperature-power line B3, when the temperature is 25 degrees Celsius, the laser power reflected by grating 23 is the highest, reaching 6mW. For every 1°C increase or decrease in temperature, the power decreases by 0.6mW. As shown in temperature-power line B2, when the temperature is 25 degrees Celsius, the laser power reflected by grating 23 is the highest, reaching 4mW. For every 1°C increase or decrease in temperature, the power decreases by 0.4mW. In this case, the highest power in the first abnormal state changes, indicating a power amplitude fluctuation in seed source 11. Targeted adjustments are needed before restarting the laser.

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

[0042] Specifically, as shown by spectrum line A2 in this embodiment, when the wavelength is widened, the change in spectrum will be smaller compared to the normal widening state, meaning the spectrum change will be slower, when the wavelength changes by the same value from the center wavelength to both sides. Conversely, as shown by spectrum line A3 in this embodiment, when the wavelength is narrowed, the change in spectrum will be larger compared to the normal widening state, meaning the spectrum change will be more rapid.

[0043] Figure 7 In the normal state and the second abnormal state of the seed source in this application embodiment, after adjusting the first temperature controller 24 to tune the laser reflected by the grating 23, a temperature-power graph (which can be referred to as the temperature-power comparison graph of the normal state and the second abnormal state) is generated on the photodetector 21 by the laser reflected by the grating 23. When the grating is broadened, compared with the normal broadened state, the relative change in light intensity amplitude corresponding to the wavelength change of the laser spectrum reflected by the grating 23 from the center wavelength to both sides will be smaller. At the same time, as shown by the temperature-power line B4, the monitored power change compared with the same temperature in the normal state will also be relatively smaller. When the grating is narrowed, compared with the normal broadened state, the relative change in light intensity amplitude corresponding to the wavelength change of the laser spectrum reflected by the grating 23 from the center wavelength to both sides will be larger. As shown by the temperature-power line B5, the power change relative to temperature will also be relatively larger. At the same time, compared with the first abnormal state where the rate of change of power with temperature is constant, in this abnormal state, the rate of change of power with temperature will change. This allows us to distinguish between the first and second abnormal states.

[0044] After determining from 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 lines of this embodiment consistent with the normal state before powering on.

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

[0046] Specifically, as shown by spectral line A4, the center wavelength of seed source 11 shifts to the left towards a smaller center wavelength. As shown by spectral line A5, the center wavelength of seed source 11 shifts to the right towards a larger center wavelength. Due to the center wavelength shift of seed source 11, the temperature at which the laser reflected by grating 23 reaches its maximum power will change.

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

[0048] Furthermore, Figure 10 This is a schematic diagram of the second structure of the fiber laser with power and spectral monitoring functions provided in this application. The fiber laser... Figure 2 The fiber laser also includes a second temperature controller 112, which is located around the seed source 11. After determining from the above monitoring results that the center wavelength of the seed source 11 has drifted, the second temperature controller 112 can be adjusted to regulate the temperature of the environment where the seed source 11 is located, ensuring that the spectrum lines of this embodiment are consistent with the normal state before powering on.

[0049] Furthermore, the second temperature controller 112 is a high-precision temperature control device, meaning its temperature control accuracy is higher than that of the first temperature controller 24. This is because the accuracy requirements for the temperature control device differ when performing anomaly comparisons on the laser reflected by the grating 23 compared to tuning the seed source 11 from an abnormal state to a normal state. The accuracy requirements for temperature control are relatively lower when performing anomaly comparisons on the laser reflected by the grating 23, 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 to current fiber lasers with power monitoring capabilities, which can only monitor power amplitude fluctuations of the seed source, or even if they can monitor center wavelength drift and broadened bandwidth changes, they cannot distinguish between them, this application provides a fiber laser with both power and spectral monitoring capabilities. By comparing the temperature-power diagram of the seed source with that under normal conditions, it can not only monitor power amplitude fluctuations of the seed source, but also monitor center wavelength drift and broadened bandwidth changes, and distinguish between various anomalies. This allows for timely feedback on seed source anomalies in the current fiber laser, and by specifically adjusting the phase modulator 111 or the second temperature controller 112, seed source anomalies such as broadened bandwidth changes and center wavelength drift can be addressed respectively.

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

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

Claims

1. A fiber laser with power monitoring function, characterized in that, include: Seed source (11), phase modulator (111), beam splitter (12), power amplifier unit (13), frequency multiplier module (14), color separator (15) and power monitoring unit; The phase modulator tunes the broadened bandwidth of the laser generated by the seed source, and then the beam splitter (12) proportionally splits a portion of the light output from the seed source (11) to the power monitoring unit, while the remaining laser continues to enter the power amplification unit (13). The power monitoring unit includes a circulator (22), a grating (23), and a power monitor (21). The first port of the circulator (22) is connected to the beam splitter (12), the second port of the circulator (22) is connected to the grating (23), the 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 tuned within a preset temperature range by the first temperature controller (24) based on the center wavelength of the seed source (11) under normal conditions, so as 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 of the seed source (11) under normal conditions is defined as the 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 first temperature-power line after tuning 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 reflected by the grating (23) has the same center wavelength of the seed source in its initial and normal states, and the wavelength of the laser 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 highest power of the first temperature-power line and the highest power of the preset temperature-power line, and the relationship between the rate of change of the first temperature-power line and the rate of change of the preset temperature-power line, it is possible to determine whether the seed source is abnormal and the type of abnormality.

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

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

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

9. The fiber laser with power monitoring function according to claim 1, characterized in that, It also includes a second temperature controller (112), which is located 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 that of the first temperature controller (24).

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