CN116435859B - Pulse fiber laser system - Google Patents
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- CN116435859B CN116435859B CN202310584982.2A CN202310584982A CN116435859B CN 116435859 B CN116435859 B CN 116435859B CN 202310584982 A CN202310584982 A CN 202310584982A CN 116435859 B CN116435859 B CN 116435859B
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Classifications
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/1068—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using an acousto-optical device
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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
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10053—Phase control
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Abstract
The embodiment of the invention discloses a pulse fiber laser system. The pulse fiber laser system comprises a seed source, an encryption module and an amplifying module which are connected in sequence; the seed source is used for outputting continuous laser; the encryption module is used for modulating the continuous laser into pulse laser with a repetition frequency capable of being coded; the amplifying module is used for amplifying the pulse laser and outputting the amplified pulse laser; the encryption module comprises a first acousto-optic modulator, a second acousto-optic modulator and a phase modulator which are sequentially connected along the light beam transmission direction, wherein the first acousto-optic modulator modulates continuous laser into initial pulse laser, the second acousto-optic modulator compensates the phase of the initial pulse laser, and the phase modulator screens output pulses to generate pulse laser with encodable repetition frequency. The technical scheme of the embodiment of the invention realizes high-energy pulse output in multiple aspects of long pulse, high polarization extinction ratio, high energy, encodable repetition frequency and the like, realizes encodable change of the repetition frequency, stabilizes pulse output and has great effect on satellite detection imaging.
Description
Technical Field
The invention relates to the technical field of lasers, in particular to a pulse fiber laser system.
Background
The target signal obtained by laser detection is sparse in the frequency domain and the frequency spectrum is concentrated in the low-frequency region. On the basis, the Fourier lens is utilized to transform the laser image into the frequency domain, sparse sampling is implemented in the low-frequency region of the laser image, and further the feasibility of laser imaging is realized through inversion. The small-scale area array detector is arranged in a low-frequency range of a laser echo spectrum, the two-dimensional low-frequency filtering of a laser echo complex image can be equivalently realized by using a frequency domain sparse sampling mode, and under the condition that only part of high-frequency information of the image is lost, the image data volume can be reduced at the cost of losing resolution by a small margin, or the contradiction between the detector scale and high-resolution wide-width imaging can be greatly relieved. The computational imaging technology which is rapidly developed in recent years provides a certain degree of theoretical and practical support for the frequency domain sparse sampling laser imaging thought.
The polarization performance, energy and power of laser output, long pulse width and encryptable performance suitable for detection influence the application of frequency domain sparse sampling laser imaging in important fields such as satellite detection, and at present, the frequency conversion scheme of the polarization-preserving pulse fiber laser has the following two types: (1) The pulse trains are directly output, and the method has the advantages of controllable output pulse numbers, but has the defects of unbalanced amplification, incapability of equidistant amplification of the pulse trains and high loss rate of the rear end; (2) The periodic variation is utilized, and the device has the advantages of simple structure and amplification balance, but has the defects of fixed periodic variation, fixed periodic code loss of pulses, overlapping after a plurality of periods and pulse output power variation.
Disclosure of Invention
The embodiment of the invention provides a pulse fiber laser system, which realizes high-energy pulse output in multiple aspects of long pulse, high polarization extinction ratio, high energy, encodable repetition frequency and the like, realizes encodable change of the repetition frequency, stabilizes pulse output and has great effect on satellite detection imaging.
The invention provides a pulse fiber laser system, which comprises a seed source, an encryption module and an amplifying module which are connected in sequence;
the seed source is used for outputting continuous laser;
the encryption module is used for modulating the continuous laser into pulse laser with a repetition frequency capable of being coded;
the amplifying module is used for amplifying the pulse laser and outputting the amplified pulse laser;
the encryption module comprises a first acousto-optic modulator, a second acousto-optic modulator and a phase modulator which are sequentially connected along the transmission direction of a light beam, wherein the first acousto-optic modulator modulates the continuous laser into initial pulse laser, the second acousto-optic modulator compensates the phase of the initial pulse laser, and the phase modulator screens output pulses to generate pulse laser with encodable repetition frequency.
Optionally, the encryption module further includes a first signal generator, a second signal generator, and a phase lock device, where the phase lock device includes a first input end, a second input end, a first radio frequency output end, and a second radio frequency output end;
the first input end is connected with the output end of the first signal generator, the second input end is connected with the fixed potential end, the first radio frequency output end is connected with the first acousto-optic modulator, and the second radio frequency output end is connected with the second acousto-optic modulator;
the output end of the second signal generator is connected with the phase modulator.
Optionally, the seed source includes a pump source, an optical fiber beam splitter, a first active optical fiber, a second active optical fiber, a first wavelength division multiplexer, and a second wavelength division multiplexer, where a distributed feedback grating is disposed on the first active optical fiber;
the output end of the pumping source is connected with the input end of the optical fiber beam splitter, the first output end of the optical fiber beam splitter is connected with the pumping input end of the first wavelength division multiplexer, the second output end of the optical fiber beam splitter is connected with the pumping input end of the second wavelength division multiplexer, the public end of the first wavelength division multiplexer is connected with the public end of the second wavelength division multiplexer, the output end of the first wavelength division multiplexer is connected with one end of the first active optical fiber, and the output end of the second wavelength division multiplexer is connected with the first end of the second active optical fiber.
Optionally, the seed source further includes a first isolator and a second isolator, an input end of the first isolator is connected with a common end of the first wavelength division multiplexer, an output end of the first isolator is connected with a common end of the second wavelength division multiplexer, and an input end of the second isolator is connected with a second end of the second active optical fiber.
Optionally, the optical fiber amplifier further comprises a semiconductor amplifier and a first filter, wherein the input end of the semiconductor amplifier is connected with the second end of the second active optical fiber, and the output end of the semiconductor amplifier is connected with the input end of the first filter.
Optionally, the first filter is a filtering and isolating integrated device.
Optionally, the amplifying module includes a plurality of stages of optical fiber amplifiers cascaded in sequence.
Optionally, the amplifying module further comprises a multistage filter.
Optionally, the filter comprises a tilted grating or a long period grating.
Optionally, the device further comprises a collimation isolator, wherein the input end of the collimation isolator is connected with the output end of the amplifying module, and the output end of the collimation isolator outputs collimated pulse light to the space.
The pulse fiber laser system provided by the embodiment of the invention comprises a seed source, an encryption module and an amplifying module which are sequentially connected. Firstly, outputting continuous laser through a seed source, modulating the continuous laser into pulse laser with a repetition frequency capable of being coded through an encryption module, amplifying the pulse laser through an amplification module, and then outputting the pulse laser; the high-energy pulse output in the aspects of long pulse, high polarization extinction ratio, high energy, encodable repetition frequency and the like is realized, the encodable change of the repetition frequency is realized, the pulse output is stabilized, and the method has a great effect in the aspect of satellite detection imaging.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a pulse fiber laser system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a seed source according to an embodiment of the present invention;
FIG. 3 is a schematic view of another seed source according to an embodiment of the present invention;
FIG. 4 is a schematic view of a seed source according to an embodiment of the present invention;
FIG. 5 is a schematic diagram showing a comparison of continuous laser and noise output from a seed source according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of another pulse fiber laser system according to an embodiment of the present invention;
FIG. 7 is a schematic spectrum of the output of a pulsed fiber laser system according to an embodiment of the present invention;
FIG. 8 is a timing diagram of a pulsed fiber laser system according to an embodiment of the present invention outputting a single pulse;
fig. 9 is a timing diagram of outputting a plurality of pulses by the pulse fiber laser system according to the embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of a pulsed fiber laser system according to an embodiment of the present invention, and referring to fig. 1, the pulsed fiber laser system provided in this embodiment includes a seed source 10, an encryption module 20, and an amplification module 30 that are sequentially connected; the seed source 10 is used for outputting continuous laser; the encryption module 20 is used for modulating the continuous laser into pulse laser with a repetition frequency capable of being coded; the amplifying module 30 is used for amplifying the pulse laser and outputting the amplified pulse laser; the encryption module 20 includes a first acousto-optic modulator 21, a second acousto-optic modulator 22 and a phase modulator 23 sequentially connected along the beam transmission direction, the first acousto-optic modulator 21 modulates the continuous laser into an initial pulse laser, the second acousto-optic modulator 22 compensates the phase of the initial pulse laser, and the phase modulator 23 screens output pulses to generate pulse laser with encodable repetition frequency.
The seed source 10 may be a 1550nm polarization-maintaining single-frequency optical fiber laser for outputting single-frequency continuous laser. Fig. 2 is a schematic structural diagram of a seed source according to an embodiment of the present invention, referring to fig. 2, optionally, the seed source 10 includes a pump source 11, an optical fiber beam splitter 12, a first active optical fiber 13, a second active optical fiber 14, a first wavelength division multiplexer 15, and a second wavelength division multiplexer 16, where a distributed feedback grating 131 is disposed on the first active optical fiber 13; the output end of the pump source 11 is connected with the input end of the optical fiber beam splitter 12, the first output end of the optical fiber beam splitter 12 is connected with the pump input end of the first wavelength division multiplexer 15, the second output end of the optical fiber beam splitter 12 is connected with the pump input end of the second wavelength division multiplexer 16, the public end of the first wavelength division multiplexer 15 is connected with the public end of the second wavelength division multiplexer 16, the output end of the first wavelength division multiplexer 15 is connected with one end of the first active optical fiber 13, and the output end of the second wavelength division multiplexer 16 is connected with the first end of the second active optical fiber 14.
The pump source 11 may be a semiconductor laser diode LD with a pigtail output, for example, an LD with a wavelength of 980nm, and the optical fiber beam splitter 12 may be a beam splitter with a splitting ratio of 40/60, where the first output end outputs 40% of power, and the second output end outputs 60% of power, which is not limited to the embodiment of the present invention. In other embodiments, two pump sources may be selected instead of using an optical fiber beam splitter, and the implementation may be set according to practical situations. In this embodiment, a distributed feedback grating 131 (DFB) is disposed on the first active optical fiber 13, and a 980nm single-mode laser with 800mW is used for pumping, and the DFB optical fiber grating is reversely pumped by 40% with the outgoing optical power of 1mW. The second active fiber 14 was IxF-EDF-FGL-PM-L2 fiber manufactured by IxBlue, and had a length of 6m, and was amplified by a 1-stage 60%980nm LD pump and outputted 25mW.
The encryption module 20 operates on the principle that: the continuous laser beam output from the seed source 10 enters the first acousto-optic modulator 21 to form a pulse, then enters the second acousto-optic modulator 22 to be phase-locked to form a 5 μs100kHz pulse, and then passes through the phase modulator 23 (MPZ) to be pulse-selected.
With continued reference to fig. 1, the encryption module 20 further includes, optionally, a first signal generator 24, a second signal generator 25, and a phase-lock 26, the phase-lock 26 including a first input IN1, a second input IN2, a first radio frequency output RF1, and a second radio frequency output RF2; the first input end IN1 is connected with the output end of the first signal generator 24, the second input end IN2 is connected with the fixed potential end 27, the first radio frequency output end RF1 is connected with the first acousto-optic modulator 21, and the second radio frequency output end RF2 is connected with the second acousto-optic modulator 22; the output of the second signal generator 25 is connected to the phase modulator 23.
Namely, the radio frequency inputs of the first acoustic optical modulator 21 and the second acoustic optical modulator 22 are respectively connected with the RF1 and the RF2 of the phase lock 26, the first signal generator 24 outputs a 5 μs100kHz signal to enter IN1 of the phase lock 26, the fixed potential end 27 provides a +3.3vdc direct current signal to IN2, so that continuous laser forms pulses after passing through the first acoustic optical modulator 21, and the second acoustic optical modulator 22 is pulled up and not closed all the time and is only used for phase locking. The second signal generator 25 generates a random signal to the phase modulator 23, screens the output pulse, changes the repetition frequency of the pulse, and outputs an average power of 1mW.
The amplifying module 30 may include sequentially cascaded multi-stage optical fiber amplifiers, which may be designed according to practical situations, and the embodiment of the present invention is not limited thereto.
According to the technical scheme, continuous laser is output through a seed source, then modulated into pulse laser with a repeatable frequency through an encryption module, amplified and output through an amplification module; the high-energy pulse output in the aspects of long pulse, high polarization extinction ratio, high energy, encodable repetition frequency and the like is realized, the encodable change of the repetition frequency is realized, the pulse output is stabilized, and the method has a great effect in the aspect of satellite detection imaging.
Fig. 3 is a schematic structural diagram of another seed source according to an embodiment of the present invention, referring to fig. 3, optionally, the seed source 10 further includes a first isolator 17 and a second isolator 18, an input end of the first isolator 17 is connected to a common end of the first wavelength division multiplexer 15, an output end of the first isolator 17 is connected to a common end of the second wavelength division multiplexer 16, and an input end of the second isolator 18 is connected to a second end of the second active optical fiber 14.
The first isolator 17 and the second isolator 18 are used for ensuring unidirectional transmission of laser light and avoiding influence of back scattered light on stability of the seed source 10.
Fig. 4 is a schematic structural diagram of another seed source according to an embodiment of the present invention, and referring to fig. 4, optionally, the seed source further includes a semiconductor amplifier 19 (SOA) and a first filter 100, an input end of the semiconductor amplifier 19 is connected to the second end of the second active optical fiber 14, and an output end of the semiconductor amplifier 19 is connected to an input end of the first filter 100.
It will be appreciated that, when the second end of the second active optical fiber 14 is connected to an isolator, the input end of the semiconductor amplifier 19 is connected to the output end of the isolator. In this embodiment, the characteristic of suppressing the intensity noise after the SOA saturation gain is utilized to suppress the intensity noise of the DFB itself. Optionally, the first filter 100 is a filtering isolation integrated device. For example, in a specific embodiment, the first filter 100 is a 100GHz filter plus isolator, fig. 5 is a schematic diagram of comparison between continuous laser output by the seed source and Noise provided in the embodiment of the present invention, referring to fig. 5, the output optical power is 50mw, and after the 100G filter plus isolator, amplified Spontaneous Emission (ASE) Noise is suppressed, so as to improve the spectral signal-to-Noise ratio, and the line width is 1kHz, where the upper curve is continuous laser and the lower curve is Noise (Back Noise).
Fig. 6 is a schematic structural diagram of another pulse fiber laser system according to an embodiment of the present invention, referring to fig. 6, an amplifying module 30 includes a primary fiber amplifier 31, a secondary fiber amplifier 32 and a tertiary fiber amplifier 33, wherein the primary fiber amplifier 31 includes a second pump source 311, a third wavelength division multiplexer 312 and a third active fiber 313, the secondary fiber amplifier 32 includes a third pump source 321, a fourth wavelength division multiplexer 322 and a fourth active fiber 323, and the tertiary fiber amplifier 33 includes a fourth pump source 331, a fifth wavelength division multiplexer 332 and a fifth active fiber 333.
In one embodiment, the pulsed laser light is first amplified by a primary fiber amplifier 31, wherein the third active fiber 313 employs IxBlue EDF-FGL-PM-L2, and the primary fiber amplifier 31 amplifies the pulsed laser light to 50mW. The fourth active optical fiber 323 adopts a polarization-maintaining active optical fiber PM-EY-12/130 of IxBlue, and outputs 4W signal light after first-stage amplification and then passing through the isolator 34. Finally, the laser enters a three-stage optical fiber amplifier 33, four 30W 940nm lasers (fourth pump source 331) are input into a fifth wavelength division multiplexer 332, and then are amplified by reverse pumping to output pulse lasers with average power of 30W, peak value of 60W, single pulse energy of 0.3mJ, optical signal to noise ratio OSNR >53.83dB and spectral width <0.02nm and PER >20 dB.
Optionally, the amplifying module further comprises a multistage filter. Optionally, the filter comprises a tilted grating or a long period grating. Optionally, the pulse optical fiber system provided in this embodiment further includes a collimating isolator, an input end of the collimating isolator is connected to an output end of the amplifying module, and an output end of the collimating isolator outputs collimated pulse light to the space.
With continued reference to fig. 6, the transmission process of the pulse laser output by the encryption module 20 is: firstly, the light enters HBQ1 (which is 1550nm isolator and 100GHz filter synthesis device), after being filtered once, the light enters a third wavelength division multiplexer 312 of a first-stage optical fiber amplifier 31, then is connected with a third active optical fiber 313 (IxF-EDF-FGL-PM-L2 produced by 6mIxBlue corporation), LD of 800mW is used as a pumping source, signal light with 50mW output power and 23dB PER output power is obtained through HBQ (which is 1550nm isolator and 100GHz filter synthesis device) enters a second-stage optical fiber amplifier 32 for amplification, 9W 940nm pumping light is coupled into a fourth active optical fiber 323 (IxBlue-PM-EY-12/130-L3 polarization maintaining gain optical fiber) through a fourth wavelength division multiplexer 322, CPS1 is connected with a cladding power stripper CPS1, which is produced by PM-GDF-1550 optical fiber through corrosion treatment, the output is connected with 20W isolator 34 (ISO), the output power is 6W, and the polarization maintaining ratio is actually measured to 22dB.
Before the laser enters the three-stage optical fiber amplifier 33 for amplification, the cascaded inclined gratings 301 are firstly connected, PM-GDF-1550 and PLMA-GDF-25/300 are respectively used for manufacturing and then are fused in a tapered manner, the function of filtering out 1 mu mASE of the third stage is achieved, the function of an optical fiber mode field adapter MFA is achieved, and then the laser is input into the three-stage optical fiber amplifier 33 after passing through CPS 2. The 4 semiconductor lasers with the center wavelength of 940nm are used as pumping sources, pumping light is coupled into a fifth active optical fiber 333 (PLMA-EYDF-25P/300 polarization-maintaining gain optical fiber) through a fifth wavelength division multiplexer 332, the fifth wavelength division multiplexer 332 is connected with the active optical fiber by a tilting grating 302, the grating only has filtering effect on 1 mu mASE with the wavelength of 1020nm to 1055nm, other light passes through the clear grating, the rest of pumping light and cladding light are filtered after passing through the last tilting grating 303 and CPS3, the output power is 35W, the pulse is 5 mu s, the PER is 13dB, and finally the rest of light enters a collimation isolator 40 and is output to a free space. In other embodiments, the tilted grating may be replaced by a long period grating, and the relative positional relationship between the CPS and the grating needs to be adaptively adjusted due to the different filtering manners of the tilted grating and the long period grating.
Fig. 7 is a schematic spectrum diagram of the output of the pulse fiber laser system provided by the embodiment of the present invention, fig. 8 is a schematic timing diagram of the output of a single pulse of the pulse fiber laser system provided by the embodiment of the present invention, fig. 9 is a schematic timing diagram of the output of a plurality of pulses of the pulse fiber laser system provided by the embodiment of the present invention, the pulse fiber laser system provided by the embodiment of the present invention obtains a pulse laser with an output power of 31W, a pulse of 5 μs, PER of 20dB, a spectral width @3dB of 0.017nm, an osnr of 53.84dB (as in fig. 8), and a pulse frequency as in fig. 9, which is encodable, high polarization, long pulse width, and narrow line width.
The embodiment of the invention adopts self-made polarization maintaining 1550nmDFB seeds, adopts external electro-optic modulation to generate pulses, introduces a phase modulator after phase locking, changes the phase by pseudo-random codes, can distinguish detected return light in real time under the synchronization of a rear-mounted system, and performs imaging after decoding. By matching with a MOPA structure, pulses are amplified, and inclined gratings are added into an amplifying stage to serve as protection, so that long pulse laser with polarization extinction ratio PER of more than 20dB, average power of 30W, peak value of 60W, single pulse energy of 0.3mJ and signal to noise ratio of more than 53.83 is obtained, the variable repetition frequency coding is realized, pulse output is stabilized, and the method has a great effect on satellite detection imaging. The technical scheme of the embodiment of the invention has the advantages of pulse frequency encryption, high polarization extinction ratio, long pulse width, high energy, no external introduction of new phase change after phase locking, MPZ interference, stable pulse energy and low loss rate, and has extremely high application prospects in the fields of remote sensing, laser communication, high-precision sensing, coherent detection, optical parametric oscillation, light beam synthesis and the like.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (9)
1. The pulse fiber laser system is characterized by comprising a seed source, an encryption module and an amplification module which are connected in sequence;
the seed source is used for outputting continuous laser;
the encryption module is used for modulating the continuous laser into pulse laser with a repetition frequency capable of being coded;
the amplifying module is used for amplifying the pulse laser and outputting the amplified pulse laser;
the encryption module comprises a first acousto-optic modulator, a second acousto-optic modulator and a phase modulator which are sequentially connected along the transmission direction of a light beam, wherein the first acousto-optic modulator modulates the continuous laser into initial pulse laser, the second acousto-optic modulator compensates the phase of the initial pulse laser, and the phase modulator screens output pulses to generate the pulse laser with encodable repetition frequency;
the encryption module further comprises a first signal generator, a second signal generator and a phase lock device, wherein the phase lock device comprises a first input end, a second input end, a first radio frequency output end and a second radio frequency output end;
the first input end is connected with the output end of the first signal generator, the second input end is connected with the fixed potential end, the first radio frequency output end is connected with the first acousto-optic modulator, and the second radio frequency output end is connected with the second acousto-optic modulator;
the output end of the second signal generator is connected with the phase modulator.
2. The pulsed fiber laser system of claim 1, wherein the seed source comprises a pump source, a fiber splitter, a first active fiber, a second active fiber, a first wavelength division multiplexer, a second wavelength division multiplexer, the first active fiber having a distributed feedback grating disposed thereon;
the output end of the pumping source is connected with the input end of the optical fiber beam splitter, the first output end of the optical fiber beam splitter is connected with the pumping input end of the first wavelength division multiplexer, the second output end of the optical fiber beam splitter is connected with the pumping input end of the second wavelength division multiplexer, the public end of the first wavelength division multiplexer is connected with the public end of the second wavelength division multiplexer, the output end of the first wavelength division multiplexer is connected with one end of the first active optical fiber, and the output end of the second wavelength division multiplexer is connected with the first end of the second active optical fiber.
3. The pulsed fiber laser system of claim 2 wherein the seed source further comprises a first isolator and a second isolator, an input of the first isolator being connected to a common terminal of the first wavelength division multiplexer, an output of the first isolator being connected to a common terminal of the second wavelength division multiplexer, an input of the second isolator being connected to a second terminal of the second active optical fiber.
4. The pulsed fiber laser system of claim 2 further comprising a semiconductor amplifier and a first filter, an input of the semiconductor amplifier being connected to the second end of the second active fiber, an output of the semiconductor amplifier being connected to an input of the first filter.
5. The pulsed fiber laser system of claim 4 wherein the first filter is a filter-isolator integrated device.
6. The pulsed fiber laser system of claim 1 wherein the amplification module comprises a series of cascaded multistage fiber amplifiers.
7. The pulsed fiber laser system of claim 6 wherein the amplification module further comprises a multi-stage filter.
8. The pulsed fiber laser system of claim 7 wherein the filter comprises a tilted grating or a long period grating.
9. The pulsed fiber laser system of claim 1 further comprising a collimating isolator having an input coupled to the output of the amplifying module, the output of the collimating isolator outputting collimated pulsed light to space.
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| CN102263356A (en) * | 2011-06-03 | 2011-11-30 | 中国科学院上海光学精密机械研究所 | Single-frequency narrow line width polarization maintaining full-optical fiber pulse laser device |
| CN103117508A (en) * | 2013-01-24 | 2013-05-22 | 天津大学 | Multi-wavelength high repetition frequency ultrashort pulse light source |
| CN105470798A (en) * | 2016-01-29 | 2016-04-06 | 成都信息工程大学 | Linear frequency modulation single frequency pulse optical fiber laser device |
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| CN209844201U (en) * | 2019-07-05 | 2019-12-24 | 珠海光恒科技有限公司 | Optical fiber amplifier with compensation signal source |
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| CN102263356A (en) * | 2011-06-03 | 2011-11-30 | 中国科学院上海光学精密机械研究所 | Single-frequency narrow line width polarization maintaining full-optical fiber pulse laser device |
| CN103117508A (en) * | 2013-01-24 | 2013-05-22 | 天津大学 | Multi-wavelength high repetition frequency ultrashort pulse light source |
| CN105470798A (en) * | 2016-01-29 | 2016-04-06 | 成都信息工程大学 | Linear frequency modulation single frequency pulse optical fiber laser device |
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