CN219576192U - Frequency doubling fiber laser and power stabilizing system thereof - Google Patents
Frequency doubling fiber laser and power stabilizing system thereof Download PDFInfo
- Publication number
- CN219576192U CN219576192U CN202320453681.1U CN202320453681U CN219576192U CN 219576192 U CN219576192 U CN 219576192U CN 202320453681 U CN202320453681 U CN 202320453681U CN 219576192 U CN219576192 U CN 219576192U
- Authority
- CN
- China
- Prior art keywords
- frequency
- laser
- output
- waveguide
- power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000000835 fiber Substances 0.000 title claims abstract description 39
- 230000000087 stabilizing effect Effects 0.000 title abstract description 19
- 239000013307 optical fiber Substances 0.000 claims abstract description 31
- 230000006641 stabilisation Effects 0.000 claims abstract description 20
- 238000011105 stabilization Methods 0.000 claims abstract description 20
- 230000001105 regulatory effect Effects 0.000 claims abstract description 10
- 230000003993 interaction Effects 0.000 claims description 8
- 230000003287 optical effect Effects 0.000 claims description 6
- 230000003321 amplification Effects 0.000 claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims description 3
- 239000010409 thin film Substances 0.000 claims description 3
- 230000004044 response Effects 0.000 abstract description 5
- 238000005086 pumping Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Landscapes
- Lasers (AREA)
Abstract
The utility model relates to the field of fiber lasers, in particular to a frequency doubling fiber laser and a power stabilizing system thereof. The power stabilization system includes: the input end of the optical fiber amplifier is used for being connected with the single-frequency laser; the input end of the waveguide is connected with the output end of the optical fiber amplifier; the input end of the detector is connected with the output end of the waveguide; the optical fiber output end of the pump laser is connected with the optical fiber amplifier; and the input end of the temperature regulating device is connected with the second output end of the controller. The utility model adopts the waveguide mode, thereby not only realizing the power stability rapidly, having fast system response speed and good stabilizing effect, but also improving the accuracy of the output power to the greatest extent.
Description
Technical Field
The utility model relates to the field of fiber lasers, in particular to a frequency doubling fiber laser and a power stabilizing system thereof.
Background
With the development of optical fiber devices in recent years, optical indexes of fiber lasers are continuously improved and the integration degree is higher and higher, so that the fiber lasers have irreplaceable applications in the fields of fiber communication, precision measurement, laser radar and the like.
The stability of the laser power affects the signal to noise ratio of the detection signal, and the following stability of the laser power of the optical fiber is also a very interesting problem, and in the prior art, the laser output power is generally stabilized by controlling the voltage signal of an electro-optical modulator or an acousto-optic modulator arranged in the output light path of the laser through photoelectric negative feedback, but the damage threshold of the modulator is low, so that the modulator is not suitable for a high-power optical fiber laser, and has higher cost, especially for a modulator of a special wave band.
Therefore, it has been proposed to use the split frequency-doubling light after the frequency-doubling crystal as a feedback signal of the frequency-doubling crystal temperature to achieve the frequency-doubling light power stabilization, but the frequency-doubling crystal cannot achieve the rapid adjustment due to the slow temperature response, and is unfavorable for the integration and stabilization.
Disclosure of Invention
Aiming at the technical problems, the utility model provides a frequency doubling fiber laser and a power stabilizing system thereof, which are used for solving the problem of low adjustment efficiency of the conventional fiber laser system.
Based on the above object, the present utility model provides a power stabilization system of a frequency-doubled fiber laser, comprising:
the input end of the optical fiber amplifier is used for being connected with the single-frequency laser so as to receive the fundamental frequency light output by the single-frequency laser and amplify and output the optical power of the fundamental frequency light;
the input end of the waveguide is connected with the output end of the optical fiber amplifier and is used for receiving the amplified fundamental frequency light and performing frequency multiplication output on the amplified fundamental frequency light, and the waveguide is provided with a temperature regulating device for regulating the temperature of the waveguide;
the input end of the detector is connected with the output end of the waveguide and is used for collecting the laser power after frequency multiplication;
the optical fiber output end of the pump laser is connected with the optical fiber amplifier, and the amplification factor of the optical fiber amplifier is adjusted;
and the input end of the temperature regulating device is connected with the second output end of the controller.
In addition, the utility model also provides a frequency doubling optical fiber laser, which comprises a single-frequency laser and a power stabilizing system of the frequency doubling optical fiber laser.
Optionally, in the frequency doubling optical fiber laser and the power stabilizing system thereof, the waveguide is a thin film lithium niobate ridge waveguide.
Optionally, in the frequency doubling optical fiber laser and the power stabilizing system thereof, the temperature adjusting device comprises a TEC, a TEC driving module and a thermistor, wherein an input end of the TEC driving module is connected with a second output end of the controller, and an output end of the TEC driving module is connected with the TEC; the thermistor is connected with the controller and sends the detected waveguide temperature to the controller.
Optionally, in the frequency doubling fiber laser and the power stabilizing system thereof, the TEC driving module includes MAX1978.
Optionally, in the frequency doubling fiber laser and the power stabilizing system thereof, the frequency doubling fiber laser further includes a beam splitter, an input end of the beam splitter is connected with an output end of the waveguide, a first output end of the beam splitter is used for power output, and a second output end of the beam splitter is connected with an input end of the detector.
Optionally, in the frequency doubling fiber laser and the power stabilizing system thereof, the frequency doubling fiber laser further comprises a current driver, an input end of the current driver is connected with a first output end of the controller, and an output end of the current driver is connected with the pump laser.
Optionally, in the frequency doubling fiber laser and the power stabilizing system thereof, the current driver includes an LT3743 chip.
Optionally, in the frequency doubling fiber laser and the power stabilizing system thereof, the controller is an FPGA, an input end of the FPGA is connected with the detector through the ADC, and a first output end of the FPGA is connected with the pump laser through the DAC.
Optionally, the frequency doubling fiber laser further includes a man-machine interaction system, and the man-machine interaction system is connected with the controller and is used for issuing parameter configuration instructions.
The scheme has the following beneficial effects:
the frequency doubling fiber laser and the power stabilizing system thereof realize power stabilization in a waveguide mode, and have the advantages of simple structure, small volume, low cost, compact structure and high stability, and the temperature control system of the waveguide can realize the control of the waveguide temperature precision of 0.01 ℃, so that the power stabilization can be realized rapidly, the system response speed is high, the stabilizing effect is good, and the precision of the output power is improved maximally.
Drawings
FIG. 1 is a schematic block diagram of a frequency doubled fiber laser in accordance with an embodiment of the present utility model;
FIG. 2 is a diagram of PID compensation circuit of the TEC drive module according to an embodiment of the utility model;
fig. 3 is a diagram showing a connection relationship between current drivers according to an embodiment of the present utility model.
Description of the embodiments
In order to make the technical problems, technical schemes and beneficial effects solved by the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments.
It is to be understood that the embodiments set forth below represent the necessary information to enable those skilled in the art to practice the embodiments and illustrate the best mode of practicing the embodiments. Upon reading the following description in light of the accompanying drawing figures, those skilled in the art will understand the concepts of the disclosure and will recognize applications of these concepts not particularly addressed herein. It should be understood that these concepts and applications fall within the scope of the disclosure and the accompanying claims.
It will be further understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present disclosure. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will also be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present.
It will be further understood that the terms "upper," "lower," "left," "right," "front," "rear," "bottom," "middle," "top," and the like may be used herein to describe various elements and that the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings merely to facilitate describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operate in a particular orientation, and that these elements should not be limited by these terms.
These terms are only used to distinguish one element from another element. For example, a first element could be termed a "upper" element, and, similarly, a second element could be termed a "upper" element, depending on the relative orientation of the elements, without departing from the scope of the present disclosure.
It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Unless defined otherwise, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms used herein should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In one embodiment, the present utility model provides a frequency-doubled fiber laser, as shown in fig. 1, the frequency-doubled fiber laser includes: man-machine interaction system, single frequency laser (i.e. seed source in fig. 1), and power stabilization system.
The specific structure composition and connection relation of the frequency doubling fiber laser are as follows:
the power stabilization system includes a fiber amplifier, a waveguide, a detector, a pump laser, and a controller.
The input end of the optical fiber amplifier is connected with a single-frequency laser to receive the fundamental frequency light output by the seed source and amplify and output the optical power of the fundamental frequency light; the seed source is a single-frequency semiconductor light source or a single-frequency light source built in the fiber laser cavity and is used for providing fundamental frequency light of the frequency doubling fiber laser, and tuning of the wavelength of the seed source output light source can be achieved by controlling the working temperature and the working current of the seed source.
The waveguide adopts a thin film lithium niobate ridge waveguide, namely a PPLN waveguide, and the input end of the PPLN waveguide is connected with the output end of the optical fiber amplifier and is used for receiving the amplified fundamental frequency light and carrying out frequency multiplication output on the amplified fundamental frequency light. The optical power stabilization must satisfy: PPLN waveguides operate in the linear region of conversion efficiency. The PPLN waveguide is a nonlinear optical fiber device for frequency quasi-conversion, is also a core optical device of a system, and realizes frequency multiplication light output with maximum efficiency through high-precision temperature control and temperature regulation. The main operating parameters of the PPLN waveguide are directly related to temperature, so stable temperature control is needed for stable operation of the PPLN waveguide, and a temperature regulating device is arranged for the PPLN waveguide and used for regulating the temperature of the waveguide; the temperature adjusting device comprises a TEC, a TEC driving module and a thermistor, wherein the input end of the TEC driving module is connected with the second output end of the controller, and the output end of the TEC driving module is connected with the TEC; the thermistor is connected with the controller and sends the detected waveguide temperature to the controller, and in the embodiment, the TEC driving module comprises a MAX1978 chip, the chip controls the TEC driving module through an external Proportional Integral Derivative (PID) compensation network as shown in fig. 2, the temperature control precision can reach 0.001 ℃, and after the whole system stably works, the system precision can meet the requirement of 0.01 ℃.
The detector is a photoelectric detector, and the input end of the detector is connected with the output end of the PPLN waveguide through a beam splitter (the beam splitter is an optical fiber beam splitter) and is used for collecting laser power after frequency multiplication; the input end of the beam splitter is connected with the output end of the waveguide, the first output end of the beam splitter is used for power output, and the second output end of the beam splitter is connected with the input end of the detector.
The optical fiber output end of the pump laser is connected with the optical fiber amplifier, and the amplification factor of the optical fiber amplifier is adjusted; specifically, the pump laser provides a pump light source for a gain medium used in the optical fiber amplifier, and the working current of the pump laser is regulated to realize the multiple of the power amplification of the seed source light.
The controller adopts an FPGA, the input end of the FPGA is connected with the detector through an ADC, the first output end of the FPGA is connected with the pumping laser through a DAC and the current driver, and the controller is used for controlling the driving current of the pumping laser according to the frequency-doubled laser power acquired by the detector; the second output end of the FPGA is connected with the input end of the TEC driving module through the DAC and is used for adjusting the temperature of the waveguide; the third output end of the FPGA is connected with the input end of the seed source through the DAC and is used for controlling parameters of the seed source. The FPGA is in communication connection with the man-machine interaction system to receive the instruction issued by the man-machine interaction system.
The current driver includes a LT3743 chip, the LT3743 chip being configured to achieve 10A class current driving, the connection being as shown in fig. 3, the DAC being coupled to the pump laser through the LT3743, the LT3743 being a synchronous buck DC/DC controller that operates with a fixed frequency, uniform current to accurately condition the inductor current through a sense resistor in series with the inductor. LT3743 is able to condition the current in the load with an accuracy of + -6%, and the switched capacitor topology of LT3743 also reduces the overall size of the circuit board by employing a compact low value inductor. Of course, the current driver may not be provided in addition to the power stabilization control.
The ADC is a high-speed ADC, the DAC is a high-speed DAC, the high-speed ADC/DAC is an important participation part of power stable control, and the embodiment adopts a high-precision high-speed chip to realize the conversion of analog and digital. The method comprises the following steps: the ADC adopts a 16-bit 2Mhz differential ADC sampling chip, the differential signal input can maximally reduce the interference of power supply ripple and external noise on PD sampling signals, meanwhile, the PD sampling precision can be ensured by high sampling bits, and the reaction time of a system can be maximally reduced by high data processing speed, so that the stabilizing effect of power is improved. The DAC uses a single-ended 16-bit 2Mhz chip to control the current of LT 3743.
The working steps of the power stabilization system are as follows:
1) The man-machine interaction system issues the temperature and current of the seed source and the current instruction of the pumping laser, and the FPGA performs parameter configuration to control the seed source and the pumping laser to work according to the instruction.
2) The seed source realizes power amplification through the optical fiber amplifier, amplified fundamental frequency light enters the PPLN waveguide, meanwhile, the man-machine interaction system issues parameter instructions of the TEC driving module, and the FPGA enables output frequency multiplication light power to be maximum by adjusting the working temperature of the PPLN waveguide.
3) The beam splitter divides the frequency multiplication light output by the PPLN waveguide into two paths, one path is used as a reference signal of power feedback to enter the photoelectric detector, the other path is used as laser output, and the two light powers after passing through the beam splitter are in a linear relation, so that the stability of the power of the light beam of the feedback path is only ensured, and the stability of the power of the output light beam can be realized.
4) After the working state of the PPLN ridge waveguide is stable, a power stable mode is started, the FPGA acquires the output light intensity of the system through the photoelectric detector/ADC, compares the output light intensity with a system set value through calculation, runs a PID algorithm in the FPGA to quickly calculate the adjustment quantity, and controls the current of the pump laser to change towards the set value through the DAC, so that the stable control of power is finally realized. The working current of the pump laser and the output power of the optical fiber amplifier are in linear relation, and the system has high response speed and good stabilizing effect.
The FPGA is a programmable logic device, has abundant hardware resources, can realize a strong logic function, and is suitable for application in various fields due to the characteristic of hardware reconstruction; the embodiment adopts the high-performance FPGA, which can realize high processing speed, and the built-in IP core can realize addition, subtraction, multiplication and division operation in one period, so that the FPGA runs the PID algorithm to process the data, and compared with the MCU, the FPGA has the advantages of inherent stability and processing speed.
The FPGA controls and configures the current of the pumping laser according to the PID algorithm, so that the control of the driving current of the pumping laser is realized, and the final result is to obtain the laser power with stable output. In view of the concurrency of high-performance FPGA operation and the high-speed working period, such as 100Mhz, the internal multiplication and addition and subtraction are both realized by adopting a high-speed IP core, the calculation can be completed in one working period, the timeliness of the PID algorithm is ensured to be very high, and the high-speed ADC/DAC chip is adopted, so that the data conversion delay time is reduced, and finally, the scheme is ensured to obtain a very good stability index.
The above-mentioned specific implementation manner is not limited to the waveguide, the detector, the temperature adjusting device, the controller, and the like, which are relatively mature devices in the prior art, and can realize corresponding functions.
The utility model adopts the waveguide mode to realize stable power, and has the advantages of simple structure, small volume, low cost, compact structure and high stability, and the high-precision temperature control system of the waveguide can realize the control of the waveguide temperature precision of 0.01 ℃, thereby not only rapidly realizing stable power, having fast response speed of the system and good stabilizing effect, but also maximally improving the precision of output power.
The above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model, and are intended to be included in the scope of the present utility model.
Claims (10)
1. A power stabilization system for a frequency doubled fiber laser, comprising:
the input end of the optical fiber amplifier is used for being connected with the single-frequency laser so as to receive the fundamental frequency light output by the single-frequency laser and amplify and output the optical power of the fundamental frequency light;
the input end of the waveguide is connected with the output end of the optical fiber amplifier and is used for receiving the amplified fundamental frequency light and performing frequency multiplication output on the amplified fundamental frequency light, and the waveguide is provided with a temperature regulating device for regulating the temperature of the waveguide;
the input end of the detector is connected with the output end of the waveguide and is used for collecting the laser power after frequency multiplication;
the optical fiber output end of the pump laser is connected with the optical fiber amplifier, and the amplification factor of the optical fiber amplifier is adjusted;
and the input end of the temperature regulating device is connected with the second output end of the controller.
2. The power stabilization system of a frequency doubled fiber laser of claim 1 wherein the waveguide is a thin film lithium niobate ridge waveguide.
3. The power stabilization system of a frequency doubling fiber laser according to claim 1 or 2, wherein the temperature adjusting device comprises a TEC, a TEC driving module and a thermistor, an input end of the TEC driving module is connected with a second output end of the controller, and an output end of the TEC driving module is connected with the TEC; the thermistor is connected with the controller and sends the detected waveguide temperature to the controller.
4. The power stabilization system of a frequency doubled fiber laser of claim 3 wherein TEC drive module comprises MAX1978.
5. The power stabilization system of a frequency doubled fiber laser of claim 1 further comprising a beam splitter, an input of the beam splitter connected to an output of the waveguide, a first output of the beam splitter for power output, and a second output of the beam splitter connected to an input of the detector.
6. The power stabilization system of a frequency doubled fiber laser of claim 1 further comprising a current driver having an input coupled to the first output of the controller and an output coupled to the pump laser.
7. The power stabilization system of a frequency doubled fiber laser of claim 6 wherein the current driver comprises an LT3743 chip.
8. The power stabilization system of frequency doubling fiber laser of claim 1, wherein the controller is an FPGA, an input of the FPGA is connected to the detector through an ADC, and a first output of the FPGA is connected to the pump laser through a DAC.
9. A frequency doubled fiber laser comprising a single frequency laser, further comprising a power stabilization system for the frequency doubled fiber laser of any of claims 1-8.
10. The frequency doubling fiber laser of claim 9, further comprising a human-machine interaction system connected to the controller for issuing parameter configuration instructions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320453681.1U CN219576192U (en) | 2023-03-07 | 2023-03-07 | Frequency doubling fiber laser and power stabilizing system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320453681.1U CN219576192U (en) | 2023-03-07 | 2023-03-07 | Frequency doubling fiber laser and power stabilizing system thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219576192U true CN219576192U (en) | 2023-08-22 |
Family
ID=87660463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320453681.1U Active CN219576192U (en) | 2023-03-07 | 2023-03-07 | Frequency doubling fiber laser and power stabilizing system thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219576192U (en) |
-
2023
- 2023-03-07 CN CN202320453681.1U patent/CN219576192U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20120269215A1 (en) | Bias circuit of electro-absorption modulated laser and calibration method thereof | |
| CN101354515B (en) | Method and device for control bias of laser modulator | |
| CN105629520B (en) | A kind of wide and flat tunable optical frequency comb generation method | |
| CN102593715B (en) | Frequency stabilizing device of semiconductor laser and adjusting method thereof | |
| US11870210B2 (en) | Transverse mode switchable all-fiber high-order mode Brillouin laser | |
| CN103296568A (en) | Pulse fiber laser acoustic optical modulator driving power source | |
| CN105762635A (en) | Wavelength control device for adjustable optical module, and method thereof | |
| CN104104007A (en) | Laser extra-cavity power stabilization device and laser extra-cavity power stabilization method | |
| CN106785893A (en) | A kind of laser diode amplitude modulation circuit | |
| CN219576192U (en) | Frequency doubling fiber laser and power stabilizing system thereof | |
| CN103368047A (en) | High-power linear polarization laser output optical fiber amplifier and output control method | |
| CN109088306B (en) | Control circuit and method for controlling extinction ratio of laser diode driver | |
| CN114628991A (en) | Tunable semiconductor laser driving device | |
| CN106549300A (en) | A kind of temperature control circuit of semiconductor laser | |
| CN203014759U (en) | Filter drive circuit of swept source | |
| CN203367740U (en) | High-power linearly polarized laser output optical fiber amplifier | |
| CN103066485A (en) | Filter drive circuit of swept source | |
| CN110416861A (en) | A kind of microwave source and its control method | |
| CN221327006U (en) | Pressure current converting circuit, transmitter and signal transmission system | |
| CN112803956B (en) | High-efficiency optical carrier microwave signal transmitting method and device | |
| CN112636184B (en) | Mixed high-power single-frequency laser | |
| CN221686879U (en) | Constant current source driving circuit of pumping laser | |
| CN111884026B (en) | Ultrashort laser pulse light source system with high repetition frequency | |
| CN105449506A (en) | Tunable laser system | |
| CN117613652A (en) | C+L wave band broadband pulse laser generating device based on FPGA |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |