CN117060212A - Power on-line monitoring and bleaching integrated fiber laser system - Google Patents
Power on-line monitoring and bleaching integrated fiber laser system Download PDFInfo
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- CN117060212A CN117060212A CN202311085720.8A CN202311085720A CN117060212A CN 117060212 A CN117060212 A CN 117060212A CN 202311085720 A CN202311085720 A CN 202311085720A CN 117060212 A CN117060212 A CN 117060212A
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- 238000004061 bleaching Methods 0.000 title claims abstract description 26
- 238000012544 monitoring process Methods 0.000 title claims abstract description 23
- 239000013307 optical fiber Substances 0.000 claims abstract description 83
- 238000001514 detection method Methods 0.000 claims abstract description 41
- 235000005811 Viola adunca Nutrition 0.000 claims abstract description 29
- 240000009038 Viola odorata Species 0.000 claims abstract description 29
- 235000013487 Viola odorata Nutrition 0.000 claims abstract description 29
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- 229910052710 silicon Inorganic materials 0.000 claims description 2
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910052769 Ytterbium Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/0915—Processes or apparatus for excitation, e.g. pumping using optical pumping by incoherent light
- H01S3/0933—Processes or apparatus for excitation, e.g. pumping using optical pumping by incoherent light of a semiconductor, e.g. light emitting diode
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06712—Polarising fibre; Polariser
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Semiconductor Lasers (AREA)
Abstract
The invention relates to a power on-line monitoring and bleaching integrated fiber laser system, which belongs to the technical field of fiber lasers and structurally comprises a red light source (1) with a tail fiber, an optical fiber coupling acousto-optic modulator (2), a fiber beam splitter (3), a semiconductor laser (4) with a tail fiber, a blue-violet light source (5) with a tail fiber, a fiber beam combiner (6), a high-reflection fiber grating (7), an ytterbium-doped gain fiber (8), a low-reflection fiber grating (9), a cladding light filter (10), an end cap (11), a bicolor mirror (12), a delay modulation module (13), a balance detection module (14) and a control module (15). The invention utilizes the detection light power change to monitor the laser output power change on line, and controls the on-off of the bleaching light source in real time according to the detection result, thereby realizing the on-line monitoring and power compensation of the laser power, improving the stability and the service life of the fiber laser.
Description
Technical Field
The invention belongs to the technical field of fiber lasers, and particularly relates to a device for power on-line monitoring and photon darkening automatic bleaching.
Background
The fiber laser is a solid laser with rare earth element doped glass fiber as gain medium, and the rare earth element ions in the fiber are easy to form laser energy level 'particle number inversion' after absorbing pump light, and form laser oscillation output under the action of positive feedback loop (resonant cavity). Ytterbium-doped fiber lasers are particularly advantageous because of their high conversion efficiency, high beam quality, high stability, high heat dissipation, and the like, and have been widely used in the fields of industry, medical treatment, military, communication, and the like.
In recent thirty years, with the rapid development of manufacturing technologies of laser fibers, optical fiber devices, pumping semiconductors and other material devices, the output power of ytterbium-doped fiber lasers is continuously increased, and eight orders of magnitude improvement is realized from the original milliwatt level to the current vanwatt level. However, the industrial ytterbium-doped fiber laser can generate a photon darkening phenomenon after long-time operation, which results in a decrease in output power and conversion efficiency of the laser, and an increase in heat generation of the gain fiber, and further results in a decrease in safety and stability of the laser system, and these adverse effects make the photon darkening effect one of main limiting factors limiting the increase in power of the fiber laser. The main reasons for the decrease in laser power are the decrease in ytterbium ion fluorescence lifetime and the increase in absorption loss of the gain fiber, and the spectral range of the additional absorption loss induced by photodarkening extends from the ultraviolet band to the near infrared band, with the increase in absorption loss in the visible band being most pronounced. In addition, researchers find that the additional absorption loss of the visible light wave band and the near infrared wave band show a certain proportion relation, so that the additional loss of the visible light wave band is adopted to calibrate the photodarkening degree, and a theoretical basis is provided for monitoring the output power change of the laser by utilizing the power change of the detection light.
The methods for inhibiting photodarkening mainly comprise three methods: (1) The ion co-doping, doping aluminum, cerium, phosphorus and other ions in the process of preparing the optical fiber can effectively inhibit the photodarkening effect; (2) Carrying out gas treatment, namely carrying out carrier gas treatment on ytterbium-doped quartz glass or quartz optical fiber for a period of time to enable gas molecules to be fully dissolved in a quartz glass structure; (3) Thermal bleaching and photobleaching eliminate additional loss by high temperature treatment or introduction of special band laser after photodarkening effect of the fiber. The ion co-doping and gas treatment method has high requirements on the design and manufacture of the optical fiber, the darkening of the optical fiber cannot be regulated and controlled in the operation process of the laser, the high temperature required by the thermal bleaching can damage a system device, the photon darkening can be inhibited only by adding a laser light source with a special wave band in the optical bleaching, and the method has greater engineering significance for optical fiber laser manufacturers.
Disclosure of Invention
Based on the method, the laser output power change is monitored on line by utilizing the detection light power change, and the on-off of the bleaching light source is controlled in real time according to the detection result, so that the on-line monitoring and power compensation of the laser power are realized, and the stability and the service life of the fiber laser are improved.
The technical scheme of the invention is as follows:
the power on-line monitoring and bleaching integrated fiber laser system structurally comprises a semiconductor laser 4 with a tail fiber, a blue-violet light source 5 with a tail fiber, a fiber combiner 6, a high-reflection fiber grating 7, an ytterbium-doped gain fiber 8, a low-reflection fiber grating 9, a cladding light filter 10 and an end cap 11, and is characterized by also comprising a red light source 1 with a tail fiber, a fiber-coupled acousto-optic modulator 2, a fiber beam splitter 3, a dichroic mirror 12, a delay modulation module 13, a balance detection module 14 and a control module 15; the red light source 1 with the tail fiber is sequentially connected with the acousto-optic modulator 2 and the optical fiber beam splitter 3, the emergent optical fiber with small coupling ratio of the optical fiber beam splitter 3, the tail fiber of the semiconductor laser 4 and the tail fiber of the blue-violet light source 5 are respectively welded with the input optical fiber of the optical fiber beam combiner 6, the output optical fiber of the optical fiber beam combiner 6 is sequentially connected with the high-reflection fiber grating 7, the ytterbium-doped gain optical fiber 8, the low-reflection fiber grating 9, the cladding light filter 10 and the output end cap 11, red light is output to the double-color mirror 12 through the end cap 11, the red light is input to the delay modulation module 13 together with the red light with high coupling ratio of the optical fiber beam splitter 3 after being reflected by the double-color mirror 12, the output of the delay modulation module 13 is converted into an electric signal through the balance detection module 14 and is input to the control module 15, and the control module 15 controls the opening and closing of the semiconductor laser 4 and the blue-violet light source 5 according to the input electric signal;
the delay modulation module 13 has the following optical path structure: the red light of the detection light reflected by the dichroic mirror 12 sequentially passes through the collimating lens 1301, the focusing lens 1302 and the first optical fiber coupler 1303 to be incident on the first optical fiber polarization beam splitter 1304, meanwhile, the reference light from the emergent optical fiber with large coupling ratio of the optical fiber beam splitter 3 sequentially passes through the second optical fiber coupler 1305 and the 1/4 wave plate 1306 to be incident on the first optical fiber polarization beam splitter 1304, the reference light and the detection light are mixed by the first optical fiber polarization beam splitter and then transmitted to the second optical fiber polarization beam splitter 1308 through the 1/2 wave plate 1307, and the two light emergent from the second optical fiber polarization beam splitter 1308 are respectively output from the delay modulation module 13 through the third optical fiber coupler 1309 and the fourth optical fiber coupler 1310;
the control module 15 has the following circuit configuration: field effect transistor M 1 And M 2 The formed current mirror provides bias current for the whole circuit; field effect transistor M 2 、M 6 、M 7 、M 13 、M 14 A transconductance operational amplifier (OTA) as the first stage of the circuit, a field effect transistor M 6 And M 7 Is a differential input tube and a field effect tube M 6 The grid electrode of (a) is an inverting input end, and the field effect transistor M 7 The grid of the voltage transformer is a positive input end, and the reference voltage connected to the end is represented by R 1 、R 2 Partial voltage supply, field effect transistor M 6 、M 7 The common source node forms a series current negative feedback path and is connected with the field effect transistor M 12 And M 15 Is a positive feedback path; field effect transistor M 3 、M 16 The second stage of the circuit is a common source amplifying stage; output voltage V of two-stage circuit 1 External field effect transistor M 8 And M 9 The inverter is formed as an output buffer stage, and finally the slave port V out1 The output voltage signal is used as an input signal of a control chip of the semiconductor laser 4 with the tail fiber; voltage signal V 2 Through field effect transistor M 5 、M 11 Post-inverter slave port V out2 Inputting a blue-violet light source 5 with a tail fiber to control the enabling end of a chip and controlling the on and off of the blue-violet light source; wherein the field effect transistor M 1 ～M 7 Is PMOS tube, field effect tube M 8 ～M 16 Is an NMOS tube.
Preferably, the output wavelength range of the red light source 1 with the tail fiber is 630nm-650nm, the output power range is 0-20mW, and the red light source with the tail fiber is used for detecting the absorption loss of the gain fiber, monitoring the power change of laser according to the power change of red light, and realizing the on-line monitoring of the laser power.
Preferably, the working band of the optical fiber coupling acousto-optic modulator 2 is visible light and infrared band, the modulation frequency is up to 80MHz, and the optical fiber coupling acousto-optic modulator is used for modulating red light to a high frequency band, so that a low frequency band with serious noise is avoided.
Preferably, the coupling ratio of the optical fiber beam splitter 3 is 90:10, the working wavelength range is 193nm-1064nm, the optical fiber beam splitter is used for dividing red light into detection light and reference light, the emergent optical fiber with small coupling ratio transmits the detection light, and the emergent optical fiber with large coupling ratio transmits the reference light.
The output wavelength of the semiconductor laser 4 with the tail fiber can be correspondingly selected according to the requirement of the laser, and preferably, the semiconductor laser with the wavelength of 915nm or 976nm can be selected.
Preferably, the blue-violet light source 5 with the tail fiber is a high-stability blue-violet light source, the maximum output power is 20W, the wavelength is 400nm-410nm, and the blue-violet light source is used as a bleaching light source.
The central wavelength of the high reflection fiber grating 7 and the low reflection fiber grating 9 can be selected according to requirements, and the typical central wavelength is 1064nm or 1080nm.
Preferably, the dichroic mirror 12 has a reflectance of greater than 99.9% for red light and a transmittance of greater than 99.9% for other wavelengths, and is used to separate the red light detection light from the laser light and reflect the red light to the retardation modulation module 13.
Preferably, the balance detection module 14 is a silicon-based photoelectric balance detection module, the 3dB bandwidth is 350MHz, the common mode rejection ratio is greater than 25dB, and the working wavelength range is 400nm-1100nm, and is used for detecting the red light power and converting the red light power into an electric signal to be input into the control module 15.
The beneficial effects of the invention are as follows: the change of the laser power is monitored on line by utilizing the power change of the detection light, and the on-off of the bleaching light source is controlled in real time according to the power of the detection light, so that automatic bleaching is realized, and the stability and the service life of the optical fiber laser are improved.
Drawings
Fig. 1 is a general block diagram of the present invention.
Fig. 2 is a delay modulation module used in the present invention.
Fig. 3 is a control module for use with the present invention.
Detailed Description
For a further understanding of the present invention, reference will now be made in detail to the present invention, examples of which are illustrated in the accompanying drawings. It should be noted that, in this specification, the words "first" and "second" do not limit data and execution order, but merely distinguish between functions and action similar items, and do not limit the embodiments of the present invention.
Example 1 integral Structure of the invention
As shown in FIG. 1, the integral structure of the invention comprises a red light source 1 with tail fiber 633nm, an optical fiber coupling acousto-optic modulator 2, an optical fiber beam splitter 3, a semiconductor laser 4 with tail fiber, a blue-violet light source 5 with tail fiber 405nm, an optical fiber beam combiner 6, a high reflection fiber grating 7, an ytterbium-doped gain fiber 8, a low reflection fiber grating 9, a cladding light filter 10, an end cap 11, a dichroic mirror 12, a delay modulation module 13, a balance detection module 14 and a control module 15; the red light source 1 with tail fibers 633nm is sequentially connected with the acousto-optic modulator 2 and the optical fiber beam splitter 3, the emergent optical fiber with small coupling ratio of the optical fiber beam splitter 3, the tail fibers of the semiconductor laser and the tail fibers of the 405nm blue-violet light source are respectively welded with the input optical fibers of the optical fiber beam combiner 6, the output optical fibers of the optical fiber beam combiner 6 are sequentially connected with the high-reflection fiber grating 7, the ytterbium-doped gain optical fiber 8, the low-reflection fiber grating 9, the cladding light filter 10 and the end cap 11, wherein the red light is output to the bicolor mirror 12 through the end cap 11, the red light with high coupling ratio is input to the delay modulation module 13 together with the red light output by the beam splitter 3 after being reflected by the bicolor mirror 12, the output of the delay modulation module 13 is converted into an electric signal through the balance detection module 14 to be input to the control module 15, and the control module 15 controls the opening and closing of the semiconductor laser 4 and the blue-violet light source 5 according to the input electric signal.
Example 2 delay modulation Module
The delay modulation module 13 has the following optical path structure: the red light of the detection light reflected by the dichroic mirror 12 sequentially passes through the collimating lens 1301, the focusing lens 1302 and the first optical fiber coupler 1303 to be incident on the first optical fiber polarization beam splitter 1304, meanwhile, the reference light from the emergent optical fiber with a large coupling ratio of the optical fiber beam splitter 3 sequentially passes through the second optical fiber coupler 1305 and the 1/4 wave plate 1306 to be incident on the first optical fiber polarization beam splitter 1304, the reference light and the detection light are mixed by the first optical fiber polarization beam splitter and then transmitted to the second optical fiber polarization beam splitter 1308 through the 1/2 wave plate 1307, and the two light emitted from the second optical fiber polarization beam splitter 1308 are respectively output from the delay modulation module 13 through the third optical fiber coupler 1309 and the fourth optical fiber coupler 1310.
Example 3 control Module
The control module has the following circuit structure: m is M 1 And M 2 The formed current mirror provides bias current for the whole circuit; CMOS tube M 2 、M 6 、M 7 、M 13 、M 14 A composed transconductance operational amplifier (OTA) is used as a first stage of a circuit, M 6 And M 7 Is a differential input tube M 6 The grid electrode of (a) is an inverting input end, M 7 The grid of the voltage transformer is a positive input end, and the reference voltage connected to the end is represented by R 1 、R 2 Partial pressure is provided, M 6 、M 7 The common source node forms a series current negative feedback path and is connected with M 12 And M 15 Is a positive feedback path; m is M 3 、M 16 The second stage of the circuit is a common source amplifying stage; output voltage V of two-stage circuit 1 External M 8 And M 9 The inverter is formed as an output buffer stage and finally is formed from V out1 The output voltage signal is used as an input signal of a control chip of the semiconductor laser 4 with the tail fiber. Voltage signal V 2 Warp M 5 、M 11 The back of the composed inverter is from V out2 The port input is provided with a tail fiber blue-violet light source 5 to control the enabling end of the chip and control the on and off of the blue-violet light source. M is M 1 ～M 7 Is a PMOS tube, M 8 ～M 16 Is an NMOS tube.
Example 4 principles of operation of the invention
After the laser system is built, the ytterbium-doped fiber laser is formed by the semiconductor laser 4 with the tail fiber, the optical fiber combiner 6, the high-reflection fiber grating 7, the ytterbium-doped gain fiber 8, the low-reflection fiber grating 9, the cladding light filter 10 and the end cap 11, and the blue-violet light source 5 with the tail fiber is welded with the laser main body through the combiner. When the laser operates normally, the semiconductor laser 4 with the tail fiber is started, the optical fiber laser works, and the blue-violet light source 5 with the tail fiber is in a closed state. The 633nm red light is used as detection light to monitor the output power change of the laser on line, and is modulated to a high-frequency band by an optical fiber coupling acousto-optic modulator, so that a low-frequency band with serious noise is avoided. Then the light is divided into two beams by an optical fiber beam splitter 3, and red light beams with small power ratio are coupled into an optical fiber laserThe light device reflects at the double-color mirror 12 and enters the delay modulation module 13 and the balance detection module 14 together with the reference light with high power ratio in the optical fiber beam splitter. The balance detection module 14 performs balance detection by using the reference light and the detection light, and calculates the power of the detection light obtained by the detection at this time as P 0 The balance detection module 14 converts the detection result into an electric signal and inputs the electric signal to the control module 15, and the control module 15 controls the on and off of the pigtail semiconductor laser 4 and the pigtail blue-violet light source 5 according to the received electric signal. As the laser operating time increases, the degree of photodarkening of the ytterbium-doped gain fiber 8 increases, the additional absorption loss for each band increases, the laser output power decreases, and at the same time, the red light power as the probe light also decreases. When the red light power detected by the balance detection module 14 is less than 0.8P 0 V of the control module 15 out1 The port outputs low level, the signal is used as input signal to input the enabling end of the control chip of the semiconductor laser 4 with tail fiber, the semiconductor laser is closed, and the laser does not work any more; v of the simultaneous control module 15 out2 And after the port outputs high level and the enabling end of the control chip of the blue-violet light source 5 with the tail fiber receives, the blue-violet light source is started to bleach the gain optical fiber. After blue-violet light bleaching for a period of time, the additional absorption loss of the gain fiber is gradually reduced, the red light power is increased, and when the power detected by the balance detection module 14 is greater than 0.95P 0 V of the control module 15 out2 The port outputs low level, the blue-violet light source 5 with the tail fiber is closed, and bleaching is stopped; v (V) out1 The port outputs high level, the semiconductor laser 4 with the tail fiber is started, the laser works, the power of the laser is reduced after a period of time, and the process is repeated.
Claims (9)
1. The power on-line monitoring and bleaching integrated fiber laser system structurally comprises a semiconductor laser with a tail fiber (4), a blue-violet light source with a tail fiber (5), a fiber combiner (6), a high-reflection fiber grating (7), an ytterbium-doped gain fiber (8), a low-reflection fiber grating (9), a cladding light filter (10) and an end cap (11), and is characterized by also comprising a red light source with a tail fiber (1), a fiber coupling acousto-optic modulator (2), a fiber beam splitter (3), a dichroic mirror (12), a delay modulation module (13), a balance detection module (14) and a control module (15); the red light source (1) with the tail fiber is sequentially connected with the acousto-optic modulator (2) and the optical fiber beam splitter (3), the emergent optical fiber with small coupling ratio of the optical fiber beam splitter (3), the tail fiber of the semiconductor laser (4) and the tail fiber of the blue-violet light source (5) are respectively welded with the input optical fiber of the optical fiber beam combiner (6), the output optical fiber of the optical fiber beam combiner (6) is sequentially connected with the high-reflection fiber grating (7), the ytterbium-doped gain optical fiber (8), the low-reflection fiber grating (9), the cladding light filter (10) and the output end cap (11), the red light is output to the dichroic mirror (12) through the end cap (11), the red light with high coupling ratio is input to the delay modulation module (13) together with the optical fiber beam splitter (3) after being reflected by the dichroic mirror (12), the output of the delay modulation module (13) is converted into an electric signal through the balance detection module (14), and the electric signal is input to the control module (15), and the control module (15) controls the opening and closing of the semiconductor laser (4) and the blue-violet light source (5) according to the input electric signal.
The delay modulation module (13) has the following optical path structure: the red light of the detection light reflected by the dichroic mirror (12) sequentially passes through a collimating lens (1301), a focusing lens (1302) and a first optical fiber coupler (1303) to be incident on a first optical fiber polarization beam splitter (1304), meanwhile, reference light in an emergent optical fiber with large coupling ratio from the optical fiber beam splitter (3) sequentially passes through a second optical fiber coupler (1305) and a 1/4 wave plate (1306) to be incident on the first optical fiber polarization beam splitter (1304), the reference light and the detection light are mixed by the first optical fiber polarization beam splitter (1304) and then are transmitted to a second optical fiber polarization beam splitter (1308) through a 1/2 wave plate (1307), and two light beams emitted from the second optical fiber polarization beam splitter (1308) are respectively output from a delay modulation module (13) through a third optical fiber coupler (1309) and a fourth optical fiber coupler (1310);
the control module (15) has the following circuit configuration: field effect transistor M 1 And M 2 The formed current mirror provides bias current for the whole circuit; field effect transistor M 2 、M 6 、M 7 、M 13 、M 14 The transconductance operational amplifier is used as the first stage of the circuit, and the field effect transistor M 6 And M 7 Is a differential input tube and a field effect tube M 6 The grid electrode of (a) is an inverting input end, and the field effect transistor M 7 The grid of the voltage transformer is a positive input end, and the reference voltage connected to the end is represented by R 1 、R 2 Partial voltage supply, field effect transistor M 6 、M 7 The common source node forms a series current negative feedback path and is connected with the field effect transistor M 12 And M 15 Is a positive feedback path; field effect transistor M 3 、M 16 The second stage of the circuit is a common source amplifying stage; output voltage V of two-stage circuit 1 External field effect transistor M 8 And M 9 The inverter is formed as an output buffer stage, and finally the slave port V out1 The output voltage signal is used as an input signal of a control chip of the semiconductor laser (4) with the tail fiber; voltage signal V 2 Through field effect transistor M 5 、M 11 Post-inverter slave port V out2 Inputting a blue-violet light source (5) with a tail fiber to control the enabling end of a chip, and controlling the on and off of the blue-violet light source (5); wherein the field effect transistor M 1 ～M 7 Is PMOS tube, field effect tube M 8 ～M 16 Is an NMOS tube.
2. The integrated power on-line monitoring and bleaching fiber laser system according to claim (1), wherein the output wavelength range of the pigtail red light source (1) is 630nm-650nm, the output power range is 0-20mW, the integrated power on-line monitoring and bleaching fiber laser system is used for detecting the absorption loss of the gain fiber (8), and monitoring the power change of laser according to the power change of red light, so that the on-line monitoring of the laser power is realized.
3. The integrated power on-line monitoring and bleaching fiber laser system according to claim 1, wherein the operating band of the fiber-coupled acousto-optic modulator (2) is visible and infrared band, and the modulation frequency is 80MHz, so as to modulate the red light to a high frequency band, thereby avoiding a severely noisy low frequency band.
4. The integrated power on-line monitoring and bleaching fiber laser system according to claim 1, wherein the coupling ratio of the fiber beam splitter (3) is 90:10, the working wavelength range is 193nm-1064nm, the integrated power on-line monitoring and bleaching fiber laser system is used for dividing red light into detection light and reference light, an outgoing fiber with a small coupling ratio transmits the detection light, and an outgoing fiber with a large coupling ratio transmits the reference light.
5. A power on-line monitoring and bleaching integrated fiber laser system according to claim 1, characterized in that the output wavelength of the pigtail semiconductor laser (4) is 915nm or 976nm.
6. The power on-line monitoring and bleaching integrated fiber laser system according to claim 1, wherein the pigtail blue-violet light source (5) is a high-stability blue-violet light source, the maximum output power is 20W, and the wavelength is 400nm-410nm, and the pigtail blue-violet light source is used as a bleaching light source.
7. A power on-line monitoring and bleaching integrated fiber laser system according to claim 1, characterized in that the center wavelength of the high reflection fiber grating (7) and the low reflection fiber grating (9) is 1064nm or 1080nm.
8. A power on-line monitoring and bleaching integrated fiber laser system according to claim 1, characterized in that the dichroic mirror (12) has a reflectivity of more than 99.9% for red light and a transmittance of more than 99.9% for other wavelengths of light for separating the red detection light from the laser light and reflecting the red light to the retardation modulation module (13).
9. The integrated power on-line monitoring and bleaching fiber laser system according to claim 1, wherein the balance detection module (14) is a silicon-based photoelectric balance detection module, the 3dB bandwidth is 350MHz, the common mode rejection ratio is greater than 25dB, and the operating wavelength range is 400nm-1100nm, for detecting red light power, and converting the red light power into an electrical signal, and inputting the electrical signal into the control module (15).
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| CN202311085720.8A CN117060212A (en) | 2023-08-28 | 2023-08-28 | Power on-line monitoring and bleaching integrated fiber laser system |
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|---|---|---|---|
| CN202311085720.8A CN117060212A (en) | 2023-08-28 | 2023-08-28 | Power on-line monitoring and bleaching integrated fiber laser system |
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| CN202311085720.8A Pending CN117060212A (en) | 2023-08-28 | 2023-08-28 | Power on-line monitoring and bleaching integrated fiber laser system |
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| CN (1) | CN117060212A (en) |
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