CN110987368A - Optical darkening test device and method for ytterbium-doped quartz optical fiber - Google Patents
Optical darkening test device and method for ytterbium-doped quartz optical fiber Download PDFInfo
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a device and a method for testing optical darkening of ytterbium-doped quartz optical fibers, wherein the device comprises a signal source, an optical fiber flange, a pumping source, a wavelength division multiplexer, ytterbium-doped optical fibers, an optical fiber combiner and a power detector, wherein laser output by the signal source passes through the optical fiber flange and then is combined with pump light output by a first pumping source into combined light through the wavelength division multiplexer; the combined light and the pump light output by the second pump source are input through a signal end and a pump end of the optical fiber combiner respectively, the output light of the optical fiber combiner is transmitted along the ytterbium-doped optical fiber, the output end of the ytterbium-doped optical fiber is welded with the input end of the cladding light stripper, and the output light beam of the cladding light stripper enters the power detector through the filter plate. The ion inversion rate in the photodarkening test is higher, the test photodarkening loss time is shorter, and the test photodarkening loss precision is higher; the structure is simple and compact, and the test stability is better; different pump injection modes are adopted to compare the photodarkening performance under several test conditions.
Description
Technical Field
The invention relates to the field of optical fiber testing, in particular to a device and a method for testing optical darkening of an ytterbium-doped quartz optical fiber.
Background
The fiber laser has the characteristics of good heat dissipation effect, compact structure, easy maintenance and easy realization of high-power single-mode laser output, and has a remarkable application prospect in the fields of material processing (laser drilling, laser marking, laser cutting, laser cladding, laser welding and the like), medical treatment, communication, remote sensing, national defense safety and the like. However, in the application process of the fiber laser, there is a phenomenon that the laser output power gradually decreases with time, namely, a photodarkening effect. The photodarkening effect of the active fiber reduces the working efficiency of the fiber laser and there is a risk of burnout due to increased heating. Therefore, in order to research the formation mechanism and the inhibition method of the optical darkening effect of the active optical fiber, the optical darkening performance of the active optical fiber is accurately evaluated, and a set of reliable optical darkening test device is necessary to be established.
The optical darkening effect of the ytterbium-doped quartz optical fiber mainly comprises a strong light test method and a weak light test method. The strong light testing method is characterized in that an active optical fiber is connected into the optical fiber laser and is examined for a long time, a power meter is used for receiving high-energy laser passing through the active optical fiber, the change of laser power along with time is observed, and the optical darkening performance of the ytterbium-doped quartz optical fiber is calculated according to the attenuation condition of the laser power. But the strong light test method has long test time and large period; the weak light test method is an indirect test method, and uses visible light with low power as a detection light source, generally selects 633nm red light as the detection light source, injects pump laser into the ytterbium-doped silica fiber, observes the change condition of the red light power, and calculates to obtain the photodarkening performance of the ytterbium-doped silica fiber. However, the low-light test method is only an indirect test, and can only compare through relative values, and cannot visually test the loss of light darkening.
However, in the present application, the inventors found that the following problems exist in the conventional optical darkening test apparatus in the process of implementing the present invention: in the existing strong light testing method for the optical darkening effect of the ytterbium-doped optical fiber, high-energy laser with the wavelength of 1 mu m is used as a detection light source, the color center of the optical darkening with the wavelength far away from an ultraviolet-visible light wave band is detected, the optical darkening effect is not obvious, and the optical darkening performance of the ytterbium-doped optical fiber with the low optical darkening effect is difficult to detect; according to the weak light test method of the existing gain optical fiber photon darkening test system, a collimating lens, a semiconductor laser output wavelength filter, a gain optical fiber excitation wavelength filter and a narrow-band optical filter are sequentially connected to the output end of a gain optical fiber, when unabsorbed high-energy pumping light passes through the collimating lens and the three filters, the generated heat effect can affect the stability of the test system, and the collimating lens and the three filters are connected between the output end of the gain optical fiber and a power meter, so that the system is complex in structure, poor in optical structure stability and capable of affecting the stability of the test system.
Disclosure of Invention
The invention aims to: aiming at the existing problems, the optical darkening test device and method for the ytterbium-doped quartz optical fiber are provided, so that the optical darkening test has high signal-to-noise ratio and high test sensitivity, and the optical darkening performance of the low-photon darkening optical fiber can be detected; and the testing device has compact structure and high stability of the testing system.
The technical scheme adopted by the invention is as follows:
the ytterbium-doped quartz fiber optical darkening testing device comprises a signal source, a fiber flange, a pumping source, a wavelength division multiplexer, a ytterbium-doped fiber, a fiber combiner and a power detector, wherein the pumping source comprises a first pumping source and a second pumping source, and a cladding optical stripper and a filter plate are sequentially arranged between the ytterbium-doped fiber and the power detector; after passing through the optical fiber flange, the laser output by the signal source and the pump light emitted by the first pump source are combined into beam combining light through the wavelength division multiplexer; the combined light and the pump light output by the second pump source are input through a signal end and a pump end of the optical fiber combiner respectively, the output light of the optical fiber combiner is transmitted along the ytterbium-doped optical fiber, the output end of the ytterbium-doped optical fiber is welded with the input end of the cladding light stripper, and the output light beam of the cladding light stripper enters the optical power detector through the filter plate.
The invention adopts an ytterbium-doped quartz optical fiber photodarkening device and a method for testing photodarkening by adopting the same, Yb3+The ion inversion rate is high, and the light darkening test time is greatly shortened; the fiber core pumping mode or the cladding pumping mode can be freely selected, or the fiber core pumping mode and the cladding pumping mode are adopted at the same time, so that the testing freedom degree is high; the combination mode of the cladding light stripper and the optical filter for filtering out the pump light is selected, and the cladding light stripper filters out most of the pump light, so that the power of the pump light acting on the filter is low, and the influence of the thermal effect of the optical filter on the optical darkening test is avoided; the optical filter and the power detector are integrated together, so that the optical darkening testing device is more compact and has better optical stability.
Not only shortens the length of the testing time, but also can directly compare the testing result to directly obtain the required result, has obvious light darkening effect, simple structure and good optical stability,
furthermore, the signal source is a red laser, and the wavelength of output red light is 630-635 nm.
Further, the pump source is a semiconductor laser.
The invention also provides a testing method of the ytterbium-doped quartz optical fiber photodarkening testing device, and the specific method for testing the photodarkening effect by the adopted ytterbium-doped optical fiber photodarkening testing device comprises the following steps:
A. sequentially connecting an optical fiber flange, a pumping source, a wavelength division multiplexer and an optical fiber beam combiner along output light of a signal source, opening a first pumping source or a second pumping source, respectively recording power values of the first pumping source or the second pumping source under different current conditions by using a power meter detector, and closing the pumping source;
B. the ytterbium-doped optical fiber, the cladding light stripper, the filter, the power detector and the power meter head are sequentially connected along the signal source, the signal source is opened, the optical power of the light output by the signal source is detected, the current is adjusted to a target value, and the signal source is closed;
C. b, opening a pumping source, adjusting the current of the pumping source according to the relation between the output current and the output power of the pumping source obtained in the step A to enable the output power of the pumping source to reach a target value, and closing the pumping source;
D. opening a signal source, opening a pumping source after the output power of the signal source is stable, and recording the optical power value of the signal source at the initial moment and the optical power value at the t moment;
E. stopping the light darkening test when the output power of the signal source is not attenuated any more, deriving test data, and obtaining the test data according to the relational expression
Calculating photodarkening loss of αtThe photodarkening loss at time t, L being the length of the ytterbium-doped fiber, P0Power at the initial moment, PtIs the power at time t.
F. Plotting photodarkening loss versus time, according to equation αt＝αeq(1-exp(-(t/τ)β) Fitting to obtain the photodarkening loss of equilibrium, wherein αtFor the photodarkening loss at time t, α eqTo balance the state photodarkening loss, τ is the time scale and β is the stretch parameter.
Further, the step a specifically includes: the step of opening the pumping source is to open a first pumping source or a second pumping source or to open the first pumping source and the second pumping source simultaneously; when the first pump source is turned on, the output power of the pump source is more than 10 mW; when the second pump source is turned on, the output power of the second pump source is more than 10W.
The first pumping source is opened in a fiber core pumping mode, the active optical fiber has the advantages of large absorption coefficient, high ion inversion rate, short testing time and high testing efficiency. Higher ion inversion rate can be realized only by mW level pump light; the second pumping source is turned on to be in a cladding pumping mode, and due to the fact that the absorption coefficient is small, the ion inversion rate is distributed more uniformly in the length direction of the optical fiber, the test condition is easy to control, and the test result is more accurate; and simultaneously opening the first pump source and the second pump source, and simultaneously adopting a fiber core pumping mode and a cladding pumping mode to compare the optical darkening performance under the test conditions, wherein the two pumping modes are freely combined, so that the test mode of the optical darkening test can be widened.
Further, the step B specifically includes: the optical power of the output light of the signal source is less than 100 muW.
The output power of the signal source is less than 100 muW, so that the signal light output by the signal source is prevented from generating obvious photobleaching phenomenon in the ytterbium-doped fiber.
Further, the step B specifically includes: the length of the ytterbium-doped optical fiber is 5 cm-50 cm.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the optical darkening test device for the ytterbium-doped quartz optical fiber adopts a mode of cascade filtering of the cladding light stripper and the filter, so that the injection power of pump light is increased, the ion inversion rate in the optical darkening test is higher, the time of the tested optical darkening loss is shorter, and the precision of the tested optical darkening loss is higher.
2. The optical darkening testing device of the ytterbium-doped quartz optical fiber can integrate the filter and the optical power detector into a whole, so that the testing device is more compact in structure.
3. The test method for testing the photodarkening by the ytterbium-doped quartz fiber photodarkening test device is adopted, the injection mode of the pump light can be a fiber core injection mode, a cladding injection mode, a fiber core injection mode and a cladding injection mode can be simultaneously used, different pump injection modes are adopted, and the photodarkening performance under several test conditions can be compared.
4. The test method for testing the photodarkening by adopting the ytterbium-doped quartz optical fiber photodarkening test device has the advantages of simple test device, easy operation of the method, more accurate precision of the measured photodarkening effect, shorter test time and higher test efficiency.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a device for testing optical darkening of ytterbium-doped silica fiber
FIG. 2 is a fitted curve of photodarkening of 20/400-type double-clad ytterbium-doped silica fiber
Reference numerals; 1. a signal source; 2. an optical fiber flange; 3. a first pump source; 4. a wavelength division multiplexer; 5. a second pump source; 6. an optical fiber combiner; 7. an ytterbium-doped optical fiber; 8. a cladding light stripper; 9. a filter plate; 10. a power detector; 11. and a power meter head.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Implementation scheme one
The embodiment discloses a light darkening testing device for ytterbium-doped quartz optical fibers, as shown in fig. 1, the testing device mainly comprises a signal source 1, an optical fiber flange 2, a pumping source, a wavelength division multiplexer 4, a ytterbium-doped optical fiber 7, an optical fiber combiner 6 and a power detector 10, wherein the pumping source comprises a first pumping source 3 and a second pumping source 5, and the pumping source is a semiconductor laser; the signal source 1 is a red laser, and the wavelength of output red light is 630-635 nm; a cladding light stripper 8 and a filter 9 are sequentially arranged between the ytterbium-doped optical fiber 7 and the power detector 10; the power detector 10 is connected with a power meter head 11, and the power meter head 11 is used for displaying real-time display records of the power meter detector 10 on the signal power of the output signal source; after passing through the optical fiber flange 2, the laser output by the signal source 1 and the pump light emitted by the first pump source 3 are combined into beam combining light by the wavelength division multiplexer 4; the combined beam light and the pump light output by the second pump source 5 are input through the signal end and the pump end of the optical fiber combiner 6 respectively, the output light of the optical fiber combiner 6 is transmitted along the ytterbium-doped optical fiber 7, the output end of the ytterbium-doped optical fiber 7 is welded with the input end of the cladding light stripper, and the output light beam of the cladding light stripper enters the optical power detector 10 through the filter 9.
Example II
The present embodiment is described based on the first embodiment, by selecting 20/400 type double-clad ytterbium-doped silica fiber as an example, where the length of the ytterbium-doped fiber 7 is 15cm, the signal source 1 is a red laser with a wavelength of 633nm, the output power is 20mW, the second pump source 5 outputs 60W, the semiconductor laser with a central wavelength of 976nm, the optical fiber combiner 6 is a (6+1) × 1 type combiner, the output pigtail is a 20/400 double-clad fiber, the clad light stripper 8 is a 20/400 type clad light stripper 8, and the isolation of the filter 9 to 976nm pump light is 50 dB.
Example III
The embodiment is based on a testing device of embodiment I and embodiment II, and discloses a testing method for optical darkening of ytterbium-doped silica optical fibers as shown in figure 1, wherein the specific testing method for optical darkening comprises the following steps:
(1) the optical fiber flange 2, the pumping source, the wavelength division multiplexer 4 and the optical fiber beam combiner 6 are sequentially connected along the output light of the signal source 1, the first pumping source 3 is opened, the current of the laser is gradually increased, the power value of the first pumping source 3 under different current conditions is recorded by using a power meter, and the first pumping source 3 is closed.
(2) And the ytterbium-doped optical fiber 7, the cladding light stripper, the filter 9, the power detector 10 and the power meter gauge outfit 11 are sequentially connected along the signal source 1, wherein the length of the ytterbium-doped optical fiber 7 is 5-50 cm.
(3) The signal source 1 is turned on, the power meter is used for detecting the output light power of the signal source 1, the current of the signal source 1 is adjusted to a target value, and in order to prevent the signal light serving as the signal source 1 from generating an obvious photobleaching phenomenon in the ytterbium-doped optical fiber 7, the signal light power of the signal source 1 is required to be less than 100 muW.
(4) Opening a first pump source 3, and adopting a fiber core pumping mode to ensure that the output power is more than 10 mW; after the first pumping source 3 is opened, the current of the first pumping source 3 is adjusted according to the relation between the current of the first pumping source 3 and the output power recorded in the step (1), so that the output power of the first pumping source 3 reaches a target value, therefore, higher pumping power can be kept, higher ion inversion rate is ensured, the testing speed is accelerated, and the signal-to-noise ratio is improved. And detecting the power value of the pump light after passing through the cladding light stripper 8 and the filter 9 by using a power meter, and if the power meter cannot detect the power of the pump light, indicating that the cladding light stripper 8 and the filter 9 filter the pump light cleanly.
(5) And (3) turning on the signal source 1, turning on a power meter to count in real time, and turning on the first pumping source 3 after the optical power of the output light of the signal source 1 is observed to be stable. The power meter monitors in real time and continuously records the power attenuation condition of the signal light output by the signal source 1 after the first pumping source 3 is turned on and the signal light passes through the ytterbium-doped optical fiber 7.
(6) And when the optical power of the signal light output by the signal source 1 is not attenuated any more, stopping the optical darkening test. And (4) deriving data, calculating the photodarkening loss, and calculating the photodarkening loss of the equilibrium state through formula fitting.
Example IV
The embodiment is based on a testing device of embodiment I and embodiment II, and discloses a testing method for optical darkening of ytterbium-doped quartz optical fibers, as shown in figure 1, wherein the specific testing method for optical darkening comprises the following steps:
(1) sequentially connecting an optical fiber flange 2, a pumping source, a wavelength division multiplexer 4 and an optical fiber beam combiner 6 along the output light of a signal source 1, opening a second pumping source 5, gradually increasing the current of a laser, recording the power value of the second pumping source 5 under different current conditions by using a power meter, and closing the second pumping source 5;
(2) and the ytterbium-doped optical fiber 7, the cladding light stripper, the filter 9, the power detector 10 and the power meter gauge outfit 11 are sequentially connected along the signal source 1, wherein the length of the ytterbium-doped optical fiber 7 is 5-50 cm.
(3) The signal source 1 is turned on, the power meter is used for detecting the output light power of the signal source 1, the current of the signal source 1 is adjusted to a target value, and in order to prevent the signal light serving as the signal source 1 from generating an obvious photobleaching phenomenon in the ytterbium-doped optical fiber 7, the signal light power of the signal source 1 is required to be less than 100 muW.
(4) And (3) opening a second pump source 5, adopting a cladding pumping mode, wherein the output power of the second pump source 5 is more than 10W: after the second pumping source 5 is opened, the current of the second pumping source 5 is adjusted according to the relation between the current and the output power of the second pumping source 5 recorded in the step (1), so that the output power of the second pumping source 5 reaches a target value.
(5) And (3) turning on the signal source 1, turning on a power meter to count in real time, and turning on a second pumping source 5 after the optical power of the output light of the signal source 1 is observed to be stable. The power meter monitors in real time and continuously records the power attenuation condition of the signal light output by the signal source 1 after the second pumping source 5 is turned on and the signal light passes through the ytterbium-doped optical fiber 7.
(6) And when the optical power of the signal light output by the signal source 1 is not attenuated any more, stopping the optical darkening test. And (4) deriving data, calculating the photodarkening loss, and calculating the photodarkening loss of the equilibrium state through formula fitting.
EXAMPLE five
The embodiment is based on a testing device of embodiment I and embodiment II, and discloses a testing method for optical darkening of ytterbium-doped quartz optical fibers, as shown in figure 1, wherein the specific testing method for optical darkening comprises the following steps:
(1) the optical fiber flange 2, the pumping source, the wavelength division multiplexer 4 and the optical fiber beam combiner 6 are sequentially connected along the output light of the signal source 1, the first pumping source 3 is opened, the current of the laser is gradually increased, and the power value of the first pumping source 3 under different current conditions is recorded by using a power meter. Opening a second pumping source 5, gradually increasing the current of the laser, recording the power value of the second pumping source 5 under different current conditions by using a power meter, and closing the first pumping source 3 and the second pumping source 5;
(2) and the ytterbium-doped optical fiber 7, the cladding light stripper, the filter 9, the power detector 10 and the power meter gauge outfit 11 are sequentially connected along the signal source 1, wherein the length of the ytterbium-doped optical fiber 7 is 5-50 cm.
(3) The signal source 1 is turned on, the power meter is used for detecting the output light power of the signal source 1, the current of the signal source 1 is adjusted to a target value, and in order to prevent the signal light serving as the signal source 1 from generating an obvious photobleaching phenomenon in the ytterbium-doped optical fiber 7, the signal light power of the signal source 1 is required to be less than 100 muW.
(4) And simultaneously, opening the first pump source 3 and the second pump source 5, and combining a fiber core pumping mode and a cladding pumping mode to ensure that the output power of the first pump source 3 is more than 100mW and the output power of the second pump source 5 is more than 10W: and (2) simultaneously opening the first pump source 3 and the second pump source 5, and adjusting the current of the pump source according to the relationship between the current and the output power of the pump source recorded in the step (1) to enable the output power of the first pump source 3 and the output power of the second pump source 5 to reach a target value.
(5) The method comprises the steps of opening a signal source 1, opening a power meter to count in real time, simultaneously opening a first pumping source 3 and a second pumping source 5 after observing that the optical power of light output by the signal source 1 is stable, monitoring in real time by a power meter detector, and continuously recording the power attenuation condition of signal light output by the signal source 1 after the first pumping source 3 and the second pumping source 5 are opened and the signal light passes through an ytterbium-doped optical fiber 7.
(6) And when the optical power of the signal light output by the signal source 1 is not attenuated any more, stopping the optical darkening test. And (4) deriving data, calculating the photodarkening loss, and calculating the photodarkening loss of the equilibrium state through formula fitting.
Example III
The present embodiment is based on the calculation formula of the photodarkening loss between embodiment three and embodiment five and the equilibrium state lightDark loss calculation: formula for calculating light darkening loss
Wherein, αtThe light darkening loss (dB/m) at time t, PtAn optical power value (mW), P, of the signal source 1 at time t0The optical power value (mW) of the signal source 1 at the initial moment and L is the length (m) of the ytterbium-doped fiber 7, and the photodarkening loss is plotted against time according to the formula αt＝αeq(1-exp(-(t/τ)β) Fitting to obtain the photodarkening loss of equilibrium, wherein αtFor the photodarkening loss at time t, αeqTo balance the state photodarkening loss, τ is the time scale and β is the stretch parameter.
EXAMPLE seven
The embodiment is calculated based on the methods of the fourth embodiment and the sixth embodiment, and discloses a specific test parameter of optical darkening, when the wavelength of light output by the signal source 1 is 633nm, and the output power of the second pump source 5 is 60W, the driving of the signal light laser is adjusted, so that the output power of the light output by the signal source 1 is 50 μ W, therefore, a fitting curve of optical darkening loss and time can be obtained as shown in fig. 2, and the equilibrium optical darkening loss is calculated to be 139.7dB/m according to an optical darkening fitting formula.
In conclusion, the optical darkening test device and the test method for the ytterbium-doped quartz optical fiber adopted by the invention have the advantages of simple and compact structure, simple operation, easy operation of the method, increased pump light injection power, higher ion inversion rate in the optical darkening test, shorter measured optical darkening loss time and higher accuracy of the optical darkening loss; the fiber core residual pump light with better beam quality can be ensured to completely act on the detector after passing through a shorter optical path, so that the stability of the test is better.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (7)
1. The utility model provides a mix ytterbium quartz fiber photodarkening testing arrangement, includes signal source, fiber flange, pump source, wavelength division multiplexer, mixes ytterbium fiber, optical fiber beam combiner and power detector, the pump source includes first pump source and second pump source, its characterized in that: a cladding light stripper and a filter plate are sequentially arranged between the ytterbium-doped optical fiber and the power detector; after passing through the optical fiber flange, the laser output by the signal source and the pump light output by the first pump source are combined into beam combining light through the wavelength division multiplexer; the combined light and the pump light output by the second pump source are input through a signal end and a pump end of the optical fiber combiner respectively, the output light of the optical fiber combiner is transmitted along the ytterbium-doped optical fiber, the output end of the ytterbium-doped optical fiber is welded with the input end of the cladding light stripper, and the output light beam of the cladding light stripper enters the optical power detector through the filter plate.
2. The optical darkening test device of the ytterbium-doped quartz optical fiber, according to claim 1, characterized in that: the signal source is a red laser, and the wavelength of output red light is 630-635 nm.
3. The optical darkening test device of the ytterbium-doped quartz optical fiber, according to claim 1, characterized in that: the pumping source is a semiconductor laser.
4. The method for testing the photodarkening of the ytterbium-doped silica fiber according to any of claims 1, 2, 3 and 4, wherein: the specific method for testing the photodarkening effect by the adopted ytterbium-doped optical fiber photodarkening testing device comprises the following steps:
A. the optical fiber flange, the pumping source, the wavelength division multiplexer and the optical fiber beam combiner are sequentially connected along the output light of the signal source, and the following operations are respectively executed on the first pumping source and the second pumping source: opening a pumping source, recording power values of the pumping source under different current conditions by using a power meter detector, and closing the pumping source;
B. the ytterbium-doped optical fiber, the cladding light stripper, the filter, the power detector and the power meter head are sequentially connected along the signal source, the signal source is opened, the optical power of the light output by the signal source is detected, the current is adjusted to a target value, and the signal source is closed;
C. b, opening a pumping source, adjusting the current of the pumping source according to the relation between the output current and the output power of the pumping source obtained in the step A to enable the output power of the pumping source to reach a target value, and closing the pumping source;
D. opening a signal source, opening a pumping source after the output power of the signal source is stable, and recording the optical power value of the signal source at the initial moment and the optical power value at the t moment;
E. stopping the light darkening test when the output power of the signal source is not attenuated any more, deriving test data, and obtaining the test data according to the relational expression
Calculating the photodarkening loss, wherein αtThe photodarkening loss at time t, L being the length of the ytterbium-doped fiber, P0Power at the initial moment, PtIs the power at time t.
F. Plotting photodarkening loss versus time, according to equation αt＝αeq(1-exp(-(t/τ)β) Fitting to obtain the photodarkening loss of equilibrium, wherein αtFor the photodarkening loss at time t, αeqTo balance the state photodarkening loss, τ is the time scale and β is the stretch parameter.
5. The method of claim 4, wherein the method comprises: the step A specifically comprises the following steps: the step of opening the pumping source is to open a first pumping source or a second pumping source or to open the first pumping source and the second pumping source simultaneously; when the first pump source is turned on, the output power of the pump source is more than 10 mW; when the second pump source is turned on, the output power of the second pump source is more than 10W.
6. The method of claim 5, wherein the method comprises: the step B specifically comprises the following steps: the optical power of the output light of the signal source is less than 100 muW.
7. The method of claim 5, wherein the method comprises: the step B specifically comprises the following steps: the length of the ytterbium-doped optical fiber is 5 cm-50 cm.
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| CN114964737A (en) * | 2022-07-27 | 2022-08-30 | 武汉锐科光纤激光技术股份有限公司 | System, method and apparatus for testing cladding light strippers |
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