CN112332204B - All-fiber modular structure pumping source and system for intermediate infrared variable frequency laser - Google Patents
All-fiber modular structure pumping source and system for intermediate infrared variable frequency laser Download PDFInfo
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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
- H01S3/0903—Free-electron laser
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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
- H01S3/05—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
- H01S3/06754—Fibre amplifiers
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
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- H—ELECTRICITY
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- 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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1028—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the temperature
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- H—ELECTRICITY
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- 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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/131—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1317—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the temperature
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Abstract
The utility model discloses a pumping source and system with an all-fiber modular structure for a mid-infrared variable frequency laser, wherein the pumping source comprises an electrical driving module, a pumping laser module, a low-power preceding-stage pre-amplification optical module and a main power amplification module, wherein the electrical driving module provides multi-stage pumping current for the pumping laser module, generates a pumping source current state signal and a light-emitting time sequence command and sends the pumping source current state signal and the light-emitting time sequence command to the pumping laser module; the pump laser module sends pump light to the amplification optical module according to the light-emitting time sequence instruction; the low-power pre-amplification optical module generates optical monitoring feedback after receiving the pump light and sends the optical monitoring feedback to the electric drive module, and generates signal optical pulses after pre-amplification and sends the signal optical pulses to the main power amplification optical module; the main power amplification optical module further amplifies the signal light pulse by means of the energy of the pump light to obtain output signal light, generates a self monitoring signal and sends the self monitoring signal to the electric drive module.
Description
Technical Field
The invention relates to the field of lasers, in particular to a full-fiber modular structure pumping source and a system for a mid-infrared variable frequency laser.
Background
The 3-5 mu m mid-infrared band laser covers the most important transmission window of the atmosphere, has huge application prospect in the fields of environmental protection, medical treatment, national defense and the like, and is an important branch of laser technology research. Optical Parametric Oscillator (OPO) is one of important nonlinear frequency conversion technologies for expanding laser output wavelength, and in recent years, optical parametric oscillators based on frequency conversion crystals such as Zinc Germanium Phosphate (ZGP) and Periodically Poled Lithium Niobate (PPLN) have become the most widely adopted technical means for obtaining mid-infrared laser, but since these crystals only have a single frequency conversion function and need to provide fundamental frequency pump light through a rare earth ion doped gain medium, the optical parametric oscillators not only suffer from the phenomenon of deterioration of output characteristics such as beam quality due to the thermal lens effect of the fundamental frequency medium, but also have complex overall structure due to the addition of a cooling device and a fundamental frequency optical cavity. In recent years, due to the development of all-fiber lasers, an all-fiber modularized polarization-maintaining linear polarization pulse laser is used as a fundamental frequency pump light, which is an important development direction for the miniaturization of a mid-infrared laser in the future.
For the intermediate infrared optical parametric oscillator taking the all-fiber laser as the pumping source, the fundamental frequency light is directly emitted by the fiber laser, the flexibility and adjustability of the repetition frequency and the pulse width can be realized through the circuit, the beam quality of the fundamental frequency light can be ensured, a cooling system is omitted, the advantages which are not possessed by the traditional all-solid-state laser are achieved, the overall integration stability is realized in the pumping structure, and the accurate control and the effective photoelectric conversion of the circuit are the key points for ensuring the obtainment of the fundamental frequency light with high beam quality and the high-efficiency intermediate infrared laser. At present, although the reports on the Fiber-Pumped mid-infrared Parametric Oscillator always compensate the fundamental frequency Optical Pulse waveform, in order to ensure more uniform frequency conversion and suppress the influence of nonlinear effect on the system, the peak Power of a given Pulse energy is often reduced, see the documents "Shen Y, Alam S U, Chen K, et al.
Disclosure of Invention
In order to solve the problems, the invention provides a full-fiber modular pump source and a system for a mid-infrared variable frequency laser.
The mid-infrared frequency conversion laser is with all-fiber modular structure pumping source includes: electricity drive module, pumping laser module, low-power preceding stage pre-amplification optical module and main power amplification module, wherein:
the electrical driving module is connected with the pump laser module, the low-power pre-amplification optical module and the main power amplification module, and is used for providing multi-stage pumping current for the pump laser module, receiving first-stage optical monitoring feedback and second-stage optical monitoring feedback sent by the low-power pre-amplification optical module, generating a current state signal of a pumping source according to a monitoring feedback signal, receiving a temperature monitoring signal and a power monitoring signal sent by the main power amplification optical module, generating a light emitting time sequence command based on the temperature monitoring signal and the power monitoring signal, and sending the light emitting time sequence command to the pump laser module;
the pump laser module responds to the received light emitting time sequence instruction and the multi-stage pump current and sends pump light to the low-power pre-stage pre-amplification optical module and the main power amplification optical module according to the light emitting time sequence instruction;
the low-power pre-amplification optical module generates a first-level optical monitoring feedback and a second-level optical monitoring feedback after receiving the pump light and sends the first-level optical monitoring feedback and the second-level optical monitoring feedback to the electrical driving module, and generates a pre-amplified signal optical pulse based on the pump light and sends the pre-amplified signal optical pulse to the main power amplification optical module;
the main power amplification optical module receives the pump light and the pre-amplified signal light pulse, further amplifies the pre-amplified signal light pulse by means of the energy of the pump light to obtain final output signal light output, generates a self temperature monitoring signal and a power monitoring signal, and sends the self temperature monitoring signal and the power monitoring signal to the electric drive module.
Optionally, the electrical driving module includes a narrow-linewidth seed source driving circuit, a multi-stage pump source constant current driving circuit, a communication and control module, and a detection alarm module, wherein:
the narrow-line-width seed source driving circuit is used for driving a narrow-line-width semiconductor seed source to generate nanosecond-level optical pulse seed signals and outputting the nanosecond-level optical pulse seed signals to the low-power pre-amplification optical module;
the multistage pumping source constant current driving circuit is used for providing multistage pumping currents for pumping laser modules with different power levels used by multistage amplification light paths such as the low-power pre-stage pre-amplification light module and the main power amplification light module;
the detection alarm module is connected with the low-power pre-amplification optical module and the main power amplification optical module and used for carrying out temperature monitoring, power monitoring and forward and backward signal light monitoring on a pumping source according to received monitoring signals fed back by the low-power pre-amplification optical module and the main power amplification optical module to generate a current state signal of the pumping source, sending the current state signal of the pumping source to the communication and control module and sending an alarm signal when detecting that the current state signal of the pumping source exceeds a preset safety range;
the communication and control module is connected with the detection alarm module and used for giving out a light-emitting time sequence command according to the received current state signal of the pumping source according to time sequence and feeding back the light-emitting time sequence command to the pumping laser module.
Optionally, the electrical driving module further includes a TEC constant temperature electronic control module, where the TEC constant temperature electronic control module is connected to the narrow line width seed source driving circuit, and is configured to control a temperature of the narrow line width semiconductor seed source, so as to ensure that the temperature of the narrow line width semiconductor seed source is constant, and stabilize a central wavelength and a line width of an optical pulse seed signal output by the narrow line width semiconductor seed source.
Optionally, the electrical driving module further includes a pulse timing control module, wherein the pulse timing control module is connected to the narrow-line-width seed source driving circuit, and is configured to regulate and control an emission time delay of an optical pulse seed signal output after the narrow-line-width semiconductor seed source is electrically modulated.
Optionally, the pump laser module comprises a three-stage amplification pump module: the device comprises a primary pre-amplification pumping module, a secondary pre-amplification pumping module and a tertiary main amplification pumping module so as to emit multi-stage pumping light.
Optionally, the low-power pre-amplification optical module includes a first pre-amplification optical path module, a first optical monitoring feedback module, a second pre-amplification optical path module, and a second optical monitoring feedback module, which are connected in sequence, where:
the first-stage pre-amplification light path module is used for performing first-stage amplification on the optical pulse seed signal sent by the electrical driving module to obtain a first-stage amplification signal;
the first-stage optical monitoring feedback module is used for monitoring a second-stage amplification signal output by the second-stage pre-amplification optical path module and the existence of the optical pulse seed signal;
the second-stage pre-amplification light path module is used for performing second-stage amplification on the first-stage amplification signal to obtain a second-stage amplification signal, and sending the second-stage amplification signal to the main power amplification light module as a pre-amplified signal light pulse;
the second-stage optical monitoring feedback module is used for monitoring the existence of the first-stage amplified signal, the power of the second-stage amplified signal and the return light monitoring of the main power amplification optical module.
Optionally, the main power amplifying optical module comprises a fiber amplifying module, wherein:
and the optical fiber amplification module is used for amplifying the second-stage amplification signal output by the second-stage pre-amplification optical path module again to obtain the final output signal light output.
Optionally, the main power amplifying optical module further includes a collimation isolation output module, wherein the collimation isolation output module is configured to perform collimation and optical isolation on the final output signal light of the main power amplifying optical module.
Optionally, the main power amplification optical module further includes a monitoring feedback module, where the monitoring feedback module is configured to monitor temperatures of the optical fiber amplification module and the collimation isolation output module, and power of return light of the main power amplification optical module.
The pump source system includes: electric drive module, 1: the device comprises an N signal beam splitter, a pump laser module, a low-power preceding-stage pre-amplification optical module, a main power amplification module, an N:1 polarization maintaining signal beam combiner and a collimation isolation output optical module, wherein:
the electric drive module is connected with the power supply module 1: the N signal beam splitters are connected and used for carrying out N signal beam splitting on the pulse seed signals output by the electrical driving module to obtain N pulse seed signals, each pulse seed signal is input into the pair of low-power pre-amplification optical modules and the corresponding main power amplification optical module, and the corresponding pump laser modules provide multistage pump light for the pulse seed signals;
the output of the N main power amplification optical modules is connected with an N:1 polarization maintaining signal beam combiner to combine the output signals output by the N main power amplification optical modules into one path, and finally the output signals are output by the collimation isolation output optical module.
The technical scheme provided by the invention has the beneficial effects that: the invention can achieve the aim of accurately and flexibly controlling the high-peak large-pulse-energy fundamental frequency light, ensure the light beam quality of the fundamental frequency light while realizing miniaturization and integration, reduce the energy consumption and the volume of the whole intermediate infrared frequency conversion process and improve the conversion efficiency.
Drawings
Fig. 1 is a schematic structural diagram of an all-fiber modular pump source for an intermediate infrared variable frequency laser according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an electrical driving module of a pump source with an all-fiber modular structure for an intermediate infrared frequency conversion laser according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a pump laser module of an all-fiber modular pump source for an intermediate infrared frequency conversion laser according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a low-power pre-amplification optical module of a pump source with an all-fiber modular structure for an intermediate infrared frequency conversion laser according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a main power amplification optical module of a pump source with an all-fiber modular structure for an intermediate infrared frequency conversion laser according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a pump source system implemented by using a full-fiber modular pump source based on a mid-infrared frequency conversion laser according to an embodiment of the present invention.
Detailed Description
Hereinafter, exemplary embodiments of the disclosed embodiments will be described in detail with reference to the accompanying drawings so that they can be easily implemented by those skilled in the art. Also, for the sake of clarity, parts not relevant to the description of the exemplary embodiments are omitted in the drawings.
In the disclosed embodiments, it is to be understood that terms such as "including" or "having," etc., are intended to indicate the presence of the disclosed features, numbers, steps, behaviors, components, parts, or combinations thereof, and are not intended to preclude the possibility that one or more other features, numbers, steps, behaviors, components, parts, or combinations thereof may be present or added.
It should be further noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. The embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Fig. 1 is a schematic structural diagram of an all-fiber modular pump source for an intermediate infrared frequency conversion laser according to an embodiment of the present invention, where a dotted line in fig. 1 represents a light transmission direction, and as shown in fig. 1, the all-fiber modular pump source for an intermediate infrared frequency conversion laser includes: electricity drive module, pumping laser module, low-power preceding stage pre-amplification optical module and main power amplification module, wherein:
the electrical driving module is connected with the pump laser module, the low-power pre-amplification optical module and the main power amplification module, is used for realizing the connection of electricity and signal feedback, provides multi-stage pumping current for the pump laser module, receives first-stage optical monitoring feedback and second-stage optical monitoring feedback sent by the low-power pre-amplification optical module, generates a pump source current state signal when the system normally operates or does not normally operate according to the monitoring feedback signal, simultaneously receives a temperature monitoring signal and a power monitoring signal sent by the main power amplification optical module, generates an emergent light time sequence command of emergent laser or non-emergent laser based on the temperature monitoring signal and the power monitoring signal, and sends the emergent light sequence command to the pump laser module.
The pump laser module responds to the received light-emitting time sequence instruction and the multi-stage pump current, sends out pump light with the wavelength of 976nm according to the light-emitting time sequence instruction, and firstly gives out pre-amplification light module to the low-power preceding stage and then gives out main power amplification light module, as shown by a dotted line in fig. 1;
the low-power pre-amplification optical module generates a first-level optical monitoring feedback and a second-level optical monitoring feedback after receiving the pump light and sends the first-level optical monitoring feedback and the second-level optical monitoring feedback to the electrical driving module, and generates a pre-amplified signal optical pulse based on the pump light and sends the pre-amplified signal optical pulse to the main power amplification optical module;
the main power amplification optical module receives the pump light and the pre-amplified signal light pulse, further amplifies the pre-amplified signal light pulse by means of the energy of the pump light to obtain final output signal light output, generates a self temperature monitoring signal and a power monitoring signal, and sends the self temperature monitoring signal and the power monitoring signal to the electric drive module.
In an embodiment of the present invention, the electrical driving module is connected to the pump laser module, the low-power pre-amplification optical module and the main power amplification module through a cable, an optical cable or a data line.
Fig. 2 is a schematic structural composition diagram of an electrical driving module of a pumping source with an all-fiber modular structure for an intermediate infrared variable frequency laser according to an embodiment of the present invention, as shown in fig. 2, the electrical driving module includes a narrow-linewidth seed source driving circuit, a multi-stage pumping source constant-current driving circuit, a communication and control module, a TEC constant-temperature electronic control module, a detection alarm module, and a pulse timing control module, where:
the narrow-linewidth seed source driving circuit is used for driving a narrow-linewidth semiconductor seed source to generate nanosecond-level optical pulse seed signals and outputting the nanosecond-level optical pulse seed signals to the low-power pre-amplification optical module, wherein the pulse width and the repetition frequency of the optical pulse seed signals can be provided by an upper computer, and the narrow-linewidth seed source driving circuit can flexibly adjust the pulse width and the repetition frequency based on the pulse width and the repetition frequency provided by the upper computer;
the pulse time sequence control module is connected with the narrow linewidth seed source driving circuit and is used for regulating and controlling the emergent time delay of the optical pulse seed signal output by the narrow linewidth semiconductor seed source after electrical modulation, and the time delay range is different from 1ns to 10ns and is controllable
The TEC constant temperature electronic control module is connected with the narrow line width seed source driving circuit and is used for controlling the temperature of the narrow line width semiconductor seed source so as to ensure the constant temperature of the narrow line width semiconductor seed source, and therefore the stability of the central wavelength and the line width of an optical pulse seed signal output by the narrow line width semiconductor seed source is realized;
the multistage pumping source constant current driving circuit is used for providing constant current driving, namely multistage pumping current, for pumping laser modules with different power levels used by multistage amplification light paths such as the low-power pre-stage pre-amplification light module and the main power amplification light module, so that the pumping laser modules can emit pumping light with required power to enter the amplifying light modules at each stage;
the detection alarm module is connected with the low-power pre-amplification optical module and the main power amplification optical module and used for carrying out temperature monitoring, power monitoring and forward and backward signal light monitoring on the pumping source according to received monitoring signals fed back by the low-power pre-amplification optical module and the main power amplification optical module, the stable work of the pumping source in a safety range is ensured through setting different monitoring threshold values, and once the monitoring signals exceed the preset safety range, the alarm module immediately sends out alarm signals. Specifically, the detection alarm module reads corresponding monitoring signals from the pump laser module, the low-power pre-amplification optical module and the main power amplification module, compares the corresponding monitoring signals with preset monitoring thresholds respectively, judges whether the state of the pump source is safe or not, generates a current state signal of the pump source, and sends the current state signal of the pump source to the communication and control module;
the communication and control module is connected with the detection alarm module and used for giving out a light-emitting time sequence command according to the received current state signal of the pumping source according to time sequence and feeding back the light-emitting time sequence command to the pumping laser module.
Fig. 3 is a schematic structural diagram of a pump laser module of an all-fiber modular pump source for an intermediate infrared frequency conversion laser according to an embodiment of the present invention, where as shown in fig. 3, the pump laser module includes a three-stage amplification pump module: the primary pre-amplification pumping module, the secondary pre-amplification pumping module and the tertiary main amplification pumping module are used for emitting multi-stage pumping light, the multi-stage pumping light is also a module needing main temperature control in the whole system, and the multi-stage pre-amplification pumping light can be flexibly placed on devices such as a TEC refrigeration module, a radiator or a water cooling plate and the like which can be used for conducting temperature and controlling the temperature of the modules, so that accurate temperature control is realized, energy consumption can be effectively reduced, meanwhile, more accurate temperature control can be guaranteed, and stable output of pumping wavelength and pumping power is realized.
Fig. 4 is a schematic structural composition diagram of a low-power pre-amplification optical module of a pump source with an all-fiber modular structure for an intermediate infrared frequency conversion laser according to an embodiment of the present invention, and as shown in fig. 4, the low-power pre-amplification optical module includes a first-stage pre-amplification optical path module, a first-stage optical monitoring feedback module, a second-stage pre-amplification optical path module, and a second-stage optical monitoring feedback module, which are sequentially connected, where:
the first-stage pre-amplification light path module is configured to perform first-stage amplification on the optical pulse seed signal sent by the electrical driving module to obtain a first-stage amplification signal, for example, amplify the optical pulse seed signal to a magnitude of tens of milliwatts;
the first-stage optical monitoring feedback module is used for monitoring a second-stage amplification signal output by the second-stage pre-amplification optical path module and monitoring whether the optical pulse seed signal exists or not;
the second-stage pre-amplification optical path module is configured to perform second-stage amplification on the first-stage amplification signal to obtain a second-stage amplification signal, for example, amplifying the second-stage amplification signal from tens of milliwatts to watts, and sending the second-stage amplification signal to the main power amplification optical module as a pre-amplified signal optical pulse;
the second-stage optical monitoring feedback module is used for monitoring the existence of the first-stage amplified signal, the power of the second-stage amplified signal and the main power amplification optical module and is used for monitoring the return light of the third-stage main amplification optical path.
Fig. 5 is a schematic structural composition diagram of a main power amplification optical module of a pump source with an all-fiber modular structure for an intermediate infrared frequency conversion laser according to an embodiment of the present invention, and as shown in fig. 5, the main power amplification optical module includes an optical fiber amplification module, a collimation isolation output module, and a temperature power monitoring feedback module, where the optical fiber amplification module is configured to amplify a second-stage amplification signal output by a second-stage pre-amplification optical path module, that is, a signal optical pulse pre-amplified by the low-power pre-stage pre-amplification optical module, to a magnitude of tens of watts to hundreds of watts, so as to obtain a final output signal optical output. The amplification of the second-stage amplified signal is mainly realized by a high-power reverse beam combiner and a gain optical fiber module in the optical fiber amplification module; the collimation isolation output module is used for performing collimation and return light isolation on the final output signal light of the main power amplification optical module; the monitoring feedback module is used for monitoring the temperatures of the optical fiber amplification module and the collimation isolation output module and the power of return light of the main power amplification optical module, and the safe operation of the whole optical fiber amplification module is ensured.
In addition, each module in the pump source with the all-fiber modular structure for the mid-infrared variable frequency laser can be flexibly disassembled, assembled and combined through a cable wire, an optical cable wire or a data wire to form a pump source system, for example, as shown in fig. 6, the pump source system can be formed by means of a 1: and the N signal beam splitter is used for splitting 1 to N paths of pulse seed signals and providing one path to up to N paths of pulse seed signals for the light amplification of the later stage, wherein N is an integer greater than 1, and is preferably 19. Each path of pulse seed signal corresponds to a pair of low-power pre-stage pre-amplification optical modules and corresponding main power amplification optical modules which can be added and combined at will. Each pair of the low-power pre-amplification optical module and the main power amplification optical module corresponds to an integrated pump laser module and provides required multistage pump light for multistage all-fiber amplification. And finally, the output of the N main power amplification optical modules is connected with an N:1 polarization maintaining signal beam combiner to combine the output signals output by the N main power amplification optical modules into one path, and the output signals are finally output by the collimation isolation output optical module. The whole system realizes flexible modular design, for example, if N19, then high power laser output from one 40W laser output to 40 19W 760W can be realized.
That is, in an embodiment of the present invention, the pump source system includes an electrical driving module, 1: the device comprises an N signal beam splitter, a pump laser module, a low-power preceding-stage pre-amplification optical module, a main power amplification module, an N:1 polarization maintaining signal beam combiner and a collimation isolation output optical module, wherein:
the electric drive module is connected with the power supply module 1: the N signal beam splitters are connected and used for carrying out N signal beam splitting on the pulse seed signals output by the electrical driving module to obtain N pulse seed signals, each pulse seed signal is input into the pair of low-power pre-amplification optical modules and the corresponding main power amplification optical module, and the corresponding pump laser modules provide multistage pump light for the pulse seed signals;
the output of the N main power amplification optical modules is connected with an N:1 polarization maintaining signal beam combiner to combine the output signals output by the N main power amplification optical modules into one path, and finally the output signals are output by the collimation isolation output optical module.
In summary, the present invention is directed to solve the problem of how to implement accurate and flexible control and effective photoelectric supply between different modules of a high-peak large-pulse-energy polarization-preserving nanosecond pulse laser based on an all-fiber structure through a separated modular design. The all-fiber laser is subjected to opto-electro-mechanical disassembly to form an electrical driving module, a pumping laser module, a low-power pre-amplification optical module and a main power amplification optical module, the electrical driving module provides multistage pumping current for the pumping laser module, receives the first two-stage optical monitoring feedback in the low-power pre-amplification optical module, gives corresponding instructions according to monitoring feedback signals, receives temperature monitoring signals and power monitoring signals in the main power amplification optical module, judges the time for emitting laser and sends the instructions, and therefore the purpose of accurately and flexibly controlling high-peak large-pulse-energy fundamental-frequency light is achieved.
Claims (9)
1. The utility model provides a mid-infrared frequency conversion is pump source with full optical fiber modular structure which characterized in that, the pump source includes: the system comprises an electrical driving module, a pumping laser module, a low-power preceding-stage pre-amplification optical module and a main power amplification optical module, wherein:
the electrical driving module is connected with the pump laser module, the low-power pre-amplification optical module and the main power amplification optical module, and is used for providing multi-stage pumping current for the pump laser module, receiving first-stage optical monitoring feedback and second-stage optical monitoring feedback sent by the low-power pre-amplification optical module, generating a current state signal of a pumping source according to a monitoring feedback signal, receiving a temperature monitoring signal and a power monitoring signal sent by the main power amplification optical module, generating a light emitting time sequence command based on the temperature monitoring signal and the power monitoring signal, and sending the light emitting time sequence command to the pump laser module;
the pump laser module responds to the received light emitting time sequence command and the multi-stage pump current and sends pump light to the low-power pre-amplification light module and the main power amplification light module according to the light emitting time sequence command;
the low-power pre-amplification optical module generates a first-level optical monitoring feedback and a second-level optical monitoring feedback after receiving the pump light and sends the first-level optical monitoring feedback and the second-level optical monitoring feedback to the electrical driving module, and generates a pre-amplified signal optical pulse based on the pump light and sends the pre-amplified signal optical pulse to the main power amplification optical module;
the main power amplification optical module receives the pump light and the pre-amplified signal light pulse, further amplifies the pre-amplified signal light pulse by means of the energy of the pump light to obtain final output signal light output, generates a self temperature monitoring signal and a power monitoring signal and sends the self temperature monitoring signal and the power monitoring signal to the electrical drive module;
the low-power pre-amplification optical module comprises a first-stage pre-amplification optical path module, a first-stage optical monitoring feedback module, a second-stage pre-amplification optical path module and a second-stage optical monitoring feedback module which are sequentially connected, wherein:
the first-stage pre-amplification light path module is used for performing first-stage amplification on the optical pulse seed signal sent by the electrical driving module to obtain a first-stage amplification signal;
the first-stage optical monitoring feedback module is used for monitoring a second-stage amplification signal output by the second-stage pre-amplification optical path module and the existence of the optical pulse seed signal;
the second-stage pre-amplification light path module is used for performing second-stage amplification on the first-stage amplification signal to obtain a second-stage amplification signal, and sending the second-stage amplification signal to the main power amplification light module as a pre-amplified signal light pulse;
the second-stage optical monitoring feedback module is used for monitoring the existence of the first-stage amplified signal, the power of the second-stage amplified signal and the return light monitoring of the main power amplification optical module.
2. The pump source of claim 1, wherein the electrical driving module comprises a narrow linewidth seed source driving circuit, a multi-stage pump source constant current driving circuit, a communication and control module, and a detection alarm module, wherein:
the narrow-line-width seed source driving circuit is used for driving a narrow-line-width semiconductor seed source to generate nanosecond-level optical pulse seed signals and outputting the nanosecond-level optical pulse seed signals to the low-power pre-amplification optical module;
the multistage pumping source constant current driving circuit is used for providing multistage pumping currents for pumping laser modules with different power levels used by the multistage amplification light paths of the low-power pre-stage pre-amplification light module and the main power amplification light module;
the detection alarm module is connected with the low-power pre-amplification optical module and the main power amplification optical module and used for carrying out temperature monitoring, power monitoring and forward and backward signal light monitoring on a pumping source according to received monitoring signals fed back by the low-power pre-amplification optical module and the main power amplification optical module to generate a current state signal of the pumping source, sending the current state signal of the pumping source to the communication and control module and sending an alarm signal when detecting that the current state signal of the pumping source exceeds a preset safety range;
the communication and control module is connected with the detection alarm module and used for giving out a light-emitting time sequence command according to the received current state signal of the pumping source according to time sequence and feeding back the light-emitting time sequence command to the pumping laser module.
3. The pump source of claim 2, wherein the electrical driving module further comprises a TEC constant temperature electronic control module, and wherein the TEC constant temperature electronic control module is connected to a narrow linewidth seed source driving circuit, and is configured to control a temperature of the narrow linewidth semiconductor seed source, so as to ensure that the temperature of the narrow linewidth semiconductor seed source is constant, and stabilize a central wavelength and a linewidth of an optical pulse seed signal output by the narrow linewidth semiconductor seed source.
4. The pump source of claim 2, wherein the electrical driving module further comprises a pulse timing control module, wherein the pulse timing control module is connected to the narrow-linewidth seed source driving circuit and configured to regulate an emission delay of the optical pulse seed signal output by the narrow-linewidth semiconductor seed source after electrical modulation.
5. The pump source of claim 1, wherein the pump laser module comprises a three-stage amplification pump module: the device comprises a primary pre-amplification pumping module, a secondary pre-amplification pumping module and a tertiary main amplification pumping module so as to emit multi-stage pumping light.
6. The pump source of claim 1, wherein the main power amplifying optical module comprises a fiber amplifying module, wherein:
and the optical fiber amplification module is used for amplifying the second-stage amplification signal output by the second-stage pre-amplification optical path module again to obtain the final output signal light output.
7. The pump source of claim 6, wherein the main power amplifying optical module further comprises a collimating and isolating output module, wherein the collimating and isolating output module is configured to collimate and optically isolate a final output signal light of the main power amplifying optical module.
8. The pump source of claim 7, wherein the main power amplifying optical module further comprises a monitoring feedback module, wherein the monitoring feedback module is configured to monitor the temperature of the fiber amplifying module and the collimating-isolated output module and the power of the return light of the main power amplifying optical module.
9. A pump source system, comprising: the pump source of any of claims 1-8, 1: the device comprises an N signal beam splitter, an N:1 polarization maintaining signal beam combiner and a collimation isolation output optical module, wherein the pumping source comprises an electrical driving module, a pumping laser module, a low-power pre-stage pre-amplification optical module and a main power amplification optical module, and the device comprises:
the electric drive module is connected with the power supply module 1: the N signal beam splitters are connected and used for carrying out N signal beam splitting on the pulse seed signals output by the electrical driving module to obtain N pulse seed signals, each pulse seed signal is input into the pair of low-power pre-amplification optical modules and the corresponding main power amplification optical module, and the corresponding pump laser modules provide multistage pump light for the pulse seed signals;
the outputs of the N main power amplification optical modules are connected with an N:1 polarization maintaining signal beam combiner to combine the output signals output by the N main power amplification optical modules into one path, and finally the output signals are output by the collimation isolation output optical module.
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| US5499258A (en) * | 1994-05-19 | 1996-03-12 | Fujitsu Limited | Automatic temperature control circuit of laser diode and electric/optical signal converting unit using the same |
| CN105428975A (en) * | 2015-12-23 | 2016-03-23 | 上海朗研光电科技有限公司 | High-power femtosecond fiber laser device |
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Patent Citations (4)
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|---|---|---|---|---|
| US5499258A (en) * | 1994-05-19 | 1996-03-12 | Fujitsu Limited | Automatic temperature control circuit of laser diode and electric/optical signal converting unit using the same |
| CN105428975A (en) * | 2015-12-23 | 2016-03-23 | 上海朗研光电科技有限公司 | High-power femtosecond fiber laser device |
| CN106197951A (en) * | 2016-07-25 | 2016-12-07 | 长飞光纤光缆股份有限公司 | A kind of Active Optical Fiber photon darkens the Circuits System of test |
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