CN104201550A - Picosecond pulse fibre laser and pulse generation method thereof - Google Patents
Picosecond pulse fibre laser and pulse generation method thereof Download PDFInfo
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- CN104201550A CN104201550A CN201410428027.0A CN201410428027A CN104201550A CN 104201550 A CN104201550 A CN 104201550A CN 201410428027 A CN201410428027 A CN 201410428027A CN 104201550 A CN104201550 A CN 104201550A
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Abstract
The invention relates to a picosecond pulse fibre laser and a pulse generation method thereof. The laser comprises a semiconductor seed source laser, a plurality of pump lasers, an optical fibre beam combiner, an active doped optical fibre, an intensity modulator arranged on the output optical path of the seed source laser and located at the front end of the optical fibre beam combiner, a seed source laser driver connected with the electrode end of the seed source laser and used for generating a pulse drive current signal, an external intensity modulator driver connected with the electrode end of the intensity modulator and used for generating a pulse drive voltage signal, and a synchronization and time delay controller connected with the electrode ends of the seed source laser driver and the external intensity modulator; pulse output with a picosecond-order width is realized through synchronously controlling the light-emitting pulse of the semiconductor seed source laser and the light-transmitting pulse of the external intensity modulator, thus remarkably improving the utilization rate of the seed source laser and the peak power for the stable working thereof, and then improving the overall performance of the pulse laser.
Description
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Technical field
The present invention relates to a kind of pulse optical fiber, relate in particular to picosecond pulse optical fiber.
Background technology
Along with the development of fiber laser, various pulse optical fibers constantly come out, and comprise nanosecond pulse optical fiber laser, Picopulse optical fiber laser, femtosecond pulse fiber laser etc.In order to obtain the picosecond laser that waveform is good, pulse parameter is controlled, a traditional method is the light signal with the semiconductor laser output continuous (CW) of continuous operation, then by a lithium niobate intensity modulator, as optical switch, lead to fast light pulse, thereby obtain the small-power light pulse output of a picosecond magnitude, then carry out certain power amplification by rear class Active Optical Fiber.But in this structure the inside, the power of the seed source laser in continuous duty is by the waste of a lot of degree, only have its luminous power in the burst pulse time window of intensity modulator logical light to be externally only to obtain utilizing.Continuous duty due to seed source laser will cause its tube core heating simultaneously, affect its useful life.In addition, under continuous duty, the peak power of seed source laser can not improve.These have all caused the performance of whole fiber laser limited, need a kind of better technology and working method to increase work efficiency, increase working life.
Summary of the invention
Thereby what the present invention seeks to propose in order to overcome the deficiencies in the prior art is a kind of based on the larger Picopulse optical fiber laser of pulse working mode acquisition power.
For achieving the above object, the technical solution used in the present invention is: a kind of Picopulse optical fiber laser, it comprises seed source laser, a plurality of pump lasers, the optical-fiber bundling device that is fused and is connected with described seed source laser output and pump laser output, active doping optical fibre with described optical-fiber bundling device output fused fiber splice, it also comprises the external intensity modulator that is arranged on described seed source laser output light path and is positioned at optical-fiber bundling device front end, be connected for generation of the seed source laser driver of pulsed drive current signal with described seed source laser electrode tip, be connected for generation of the external intensity modulator driver of pulsed drive voltage signal with described external intensity modulator electrode tip end, what be extremely connected with external intensity modulator actuator electrical with described seed source laser driver synchronizes and time delay controller, described synchronous and time delay controller is used for the LED pulse of the seed source laser described in Synchronization Control and the logical light pulse of described external intensity modulator.
Further, described seed source laser is that output center wavelength is the distributed feed-back DFB formula semiconductor laser of 1000-1100nm scope.
Further, described intensity modulator is the mach zhender Mach-Zender interfere type intensity modulator that lithium niobate material is made.
Further, described bundling device comprises forward direction bundling device and backward bundling device, and on the bundling device described in each, welding has at least one pump laser.
The present invention also provides a kind of method of carrying out synchronous modulation for above-mentioned Picopulse optical fiber laser, described seed source laser driver and external intensity modulator driver carry out impulsive synchronization triggering by described synchronous and time delay controller respectively, and by described synchronous and time delay controller, adjust relative time delay of described LED pulse and logical light pulse, the pulse of seed source laser is substantially overlapped with the logical light pulse center of intensity modulator in time-domain.
Further, be set in the pulsewidth of LED pulse described relative time delay in the time, when the dislocation time surpasses described pulsewidth, described synchronous and time delay controller starts set-up procedure.
The present invention also provides the another kind of method for Picopulse optical fiber laser synchronous modulation, described seed source laser driver is production burst signal voluntarily, export the synchronous signal of telecommunication that triggers to described external intensity modulator driver simultaneously, make it that lock-out pulse occur, and by relative time delay of described synchronous and two kinds of pulses of time delay controller adjustment, the LED pulse of seed source laser is substantially overlapped in time-domain with the logical light pulse center of intensity modulator.
Further, be set in the pulsewidth of LED pulse described relative time delay in the time, when the dislocation time surpasses described pulsewidth, described synchronous and time delay controller starts set-up procedure.
Because technique scheme is used, the present invention compared with prior art has following advantages: fiber laser of the present invention, by the LED pulse of Synchronization Control seed source laser and the logical light pulse of external intensity modulator, has improved the efficiency of the pulse generate of picosecond magnitude width.In the situation that keeping picosecond laser existing structure, dexterously that the impulse waveform of seed source laser and external intensity modulator is synchronous in time-domain, the impulse waveform that is seed source laser substantially overlaps with the logical light pulse center of intensity modulator in time-domain, the luminous power utilance of seed source laser and the peak power that can work have been improved significantly, suppressed the heating of seed source laser, on generating, kind of sub level picopulse realized larger Output optical power, alleviated the gain burden of rear class fiber amplifier, improved the performance of integral optical fiber laser.
Accompanying drawing explanation
Fig. 1 is the structural representation of seed source of the present invention and external modulation lock-out pulse fiber laser;
Fig. 2 is the time domain waveform schematic diagram of seed source laser LED pulse of the present invention and the logical light pulse of intensity modulator;
Fig. 3 is time delay mismatch (seed source pulse lags behind the logical light pulse of the external intensity modulator) schematic diagram of seed source laser LED pulse of the present invention and the logical light pulse of intensity modulator;
Fig. 4 is time delay mismatch (seed source pulse advance is in the logical light pulse of the external intensity modulator) schematic diagram of seed source laser LED pulse of the present invention and the logical light pulse of external intensity modulator;
Fig. 5 is synchronous in the first embodiment of the present invention and time delay is controlled schematic diagram;
Fig. 6 is synchronous in the second embodiment of the present invention and time delay is controlled schematic diagram.
Wherein, 11, seed source laser; 12, external intensity modulator; 13, seed source laser driver; 14, external intensity modulator driver; 15, synchronous and time delay controller; 16, forward direction optical-fiber bundling device; 17, active doping optical fibre; 18, backward optical-fiber bundling device; 19, semiconductor pump laser; 10, output optical isolator; 21, seed source laser output pulse waveform signal; 22, the logical optical pulse waveform signal of external intensity modulator.
Illustrate: the ordinate of the waveform in Fig. 2 is relative unit, the non-proportionally drafting of abscissa time, only for illustrating with explanation the solution of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiment of the invention is elaborated:
Embodiment mono-:
Fiber laser as shown in Figure 1, its main body is MOPA structure, mainly comprises: seed source laser 11, forward direction optical-fiber bundling device 16, active doping optical fibre 17, backward optical-fiber bundling device 18, semiconductor pump laser 19, output optical isolator 10.Under operating state, a plurality of semiconductor pump lasers 19 are respectively by forward direction bundling device 16 and backward bundling device 18, pumping laser is injected in the inner cladding of active doping optical fibre 17, thereby finally by fibre core, absorbed and form population upset generation light amplification effect, finally by output optical isolator 10, export.
Psec fiber laser in the present embodiment has increased again external intensity modulator 12, seed source laser driver 13, external intensity modulator driver 14, synchronous and time delay controller 15 on MOPA architecture basics.Wherein, external intensity modulator 12 is between the output and forward direction optical-fiber bundling device 16 inputs of seed source laser 11, seed source laser driver 13 is connected with the electrode tip of seed source laser 11, external intensity modulator driver 14 is connected with intensity modulator 12 electrode tips, is synchronously connected with external intensity modulator driver 14 electrode tips with seed source laser driver 13 respectively with time delay controller 15 outputs.
In the present embodiment, seed source laser 11 is the distributed feed-back DFB formula semiconductor laser of output center wavelength 1000-1100nm scope.The mach zhender Mach-Zender interfere type intensity modulator that external intensity modulator 12 is made for lithium niobate material.Seed source laser driver 13 is for offering seed source laser 11 pulsed drive current, and making it send wavelength is that 1064nm, pulse duration are that 1ns, repetition rate are the LED pulse that 1MHz, peak light power are 500mW.External modulation driver 14 offers the drive voltage signal of external intensity modulator 12 pulses, and making its input light to 1064nm ± 10nm wavelength produce pulse duration is the logical light pulse that 150ps, repetition rate are 1MHz.
Its impulsive synchronization method as shown in Figure 5, clock 0 by synchronous and time delay controller 15 inside is divided into two-way, through time delay device 1 and time delay device 2, obtain the controlled clock signal of two-way time delay respectively, wherein seed source laser driver 13 is supplied with on a road, lock its inside local clock 1, the local clock 2 of external intensity modulator driver 14 inside is supplied with on another road, thereby, make the LED pulse of seed source laser 11 outputs, the logical light pulse of external intensity modulator 12 outputs is all synchronizeed with clock 0, guaranteed that like this LED pulse synchronizes with logical light pulse output each other.Although the pulse of seed source laser 11 has reached and has synchronizeed with the pulse of external intensity modulator 12, but may have a time delay, as shown in Figure 3 and Figure 4, there is dislocation in the time window of two group pulses now, and this will cause the phenomenon of exporting unglazed or the low light level to occur.When the LED pulse center of seed source laser is ahead of the logical light pulse center of external intensity modulator (as shown in Figure 4), suitably increase the time delay of seed source laser driver time delay device 1 before, or reduce the time delay of the time delay device 2 before external intensity modulator; When the LED pulse center of seed source laser lags behind the logical light pulse center of external intensity modulator (as shown in Figure 3), suitably increase the time delay of external intensity modulator time delay device 2 before, or reduce the time delay of the time delay device 1 before seed source laser driver.To make the LED pulse center of seed source laser and the logical light pulse center of external intensity modulator reach best overlap condition by adjusting the relative retardation of two time delay devices in a word.
In experiment, can and measure the relative time delay of time delay device 2 by the synchronous and time delay device 1 of time delay controller 15, and on oscilloscope, observe seed source laser 11 by the output laser pulse (LED pulse) after external intensity modulator, make the amplitude of output laser pulse to reach maximum, group pulse in these time two in time domain just in best overlap condition.Two group pulse time domain relativenesses now as shown in Figure 2.Above described target pulsewidth refer to the pulsewidth of laser pulse, such as the fiber laser of 150 psecs, its target pulsewidth is 150 psecs.
Need to further illustrate, the external intensity modulator in the present embodiment can be operated in fast state, at least high order of magnitude of its semiconductor seed source laser than direct modulation.Meanwhile, the direct semiconductor laser of modulation (chirp) phenomenon of can warbling, this warble after optical fiber in by nonlinear effect, may make pulse broaden or distort, this is also one of disadvantage of directly modulated laser.Laser is high speed operation state (short pulse operating state is equivalent to high speed operation state, i.e. the narrower in width of pulse is little), and the action effect of external intensity modulator is more outstanding.Its concrete structure and principle are not main points of the present invention, do not repeat them here.Equally, synchronous and time delay controller can adopt discrete component also can adopt integrated circuit to realize, and its concrete structure is not main points of the present invention, and those skilled in the art can make according to technical solution of the present invention the synchronous and time delay controller of carrying out function of the present invention.
Embodiment bis-:
The present embodiment provides the another kind of method of psec fiber laser impulsive synchronization modulation in embodiment mono-, and seed source laser driver relies on its inside local clock 1 after time delay device 1, to be input in electric pulse maker; Synchronous signal of telecommunication that triggers of its output simultaneously, to external intensity modulator driver, locks its inner local clock 2, and the local clock 2 of external intensity modulator driver 14 and the local clock 1 of seed source laser driver 13 are synchronizeed.Equally, although the pulse of seed source laser 11 has reached and synchronizeed with the pulse of external intensity modulator 12, may have a time delay, as shown in Figure 3 and Figure 4, there is dislocation in the time window of two group pulses now, and this will cause the phenomenon of exporting unglazed or the low light level to occur.Similar with embodiment mono-, adopt the method that regulates time delay device 1 and time delay device amount in 2 relative time delay, can allow the LED pulse of seed source laser 11 outputs and the logical light pulse of external intensity modulator 12 outputs reach overlap condition.Experimentally adopt and embodiment mono-in identical method.So just reach the object that the LED pulse of seed source laser substantially overlaps with the logical light pulse center of intensity modulator in time-domain.Do not use in the present embodiment the local clock 0 in synchronous and time delay controller 15.
We know, semiconductor laser is to produce population inversion by Injection Current, by two chamber faces, reflect to form resonance stimulated radiation.The working temperature of its active area directly affects its peak power output and working life.In the time of a semiconductor laser continuous (CW) work, due to heat accumulation effect, the temperature of active area can raise, and the probability of the inefficacy mechanisms such as luminous efficiency reduction, concealed wire and section damage improves, and the life-span of laser reduces, and peak-power limited.If be operated in pulse mode, under the seed source laser nanosecond pulse that particularly the present invention provides, heat accumulation effect reduces greatly, because only the time less than 1% is generating heat in each pulse period, all the other times, all in heat radiation, have so just been improved the performance of semiconductor laser significantly.The in the situation that of this little duty ratio burst pulse, the temperature of active area is inhibited, and peak power can obviously improve, and the life-span is also extended simultaneously.The present invention has utilized the advantage under burst pulse mode of operation just, and make the external intensity modulator pulse of rear class and the seed source laser pulse overlap of prime, both taken full advantage of semi-conductive efficient light power, do not change again the basic structure of fiber laser, only increase a small amount of electronic unit.Illustrate as follows, if employing continuously-running duty, the peak power output of the semiconductor seed source laser continuous duty in our experiment is 10mW, through the pulse strength of external intensity modulator, modulate again, the insertion loss of supposing external intensity modulator is 3dB, and finally we can obtain the light pulse that peak power is 5mW; If adopt burst pulse working method, our same experiment seed source laser can obtain the peak power output of 500mW, and after external intensity modulator, we obtain the light pulse that peak power is 250mW.Adopt after pulse working mode, peak power improves 50 times! Meanwhile, therefore the caloric value of seed source laser and life-span are not affected.
The present invention proposes while noise spectra of semiconductor lasers and intensity modulator and carry out pulsed drive, there is obvious technical advantage: the thermal effect of (1) semiconductor laser obviously weakens, because it is operated under very little duty ratio state; (2) semi-conductive output peak light power can improve an about 1-2 order of magnitude, namely about 10-100 magnitude doubly.Simultaneously, in order to guarantee the normal effectively operation of fiber laser, when the present invention regulates time delay to make the pulse of semiconductor laser and the impulsive synchronization of external intensity modulator by adjusting, and guarantee the pulse envelope of the pulse envelope coverage strength modulator of seed source laser, thereby effectively utilize the pulsed light output of seed source source laser device, think that the laser amplifier of rear class has been made place mat.
Above-described embodiment is only explanation technical conceive of the present invention and feature, and its object is to allow person skilled in the art can understand content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences that Spirit Essence is done according to the present invention change or modify, within all should being encompassed in protection scope of the present invention.
Claims (8)
1. a Picopulse optical fiber laser, it comprises seed source laser, a plurality of pump lasers, the optical-fiber bundling device that is fused and is connected with described seed source laser output and pump laser output, active doping optical fibre with described optical-fiber bundling device output fused fiber splice, it is characterized in that: it also comprises the external intensity modulator that is arranged on described seed source laser output light path and is positioned at optical-fiber bundling device front end, be connected for generation of the seed source laser driver of pulsed drive current signal with described seed source laser electrode tip, be connected for generation of the external intensity modulator driver of pulsed drive voltage signal with described external intensity modulator electrode tip, what be extremely connected with external intensity modulator actuator electrical with described seed source laser driver synchronizes and time delay controller, described synchronous and time delay controller is used for the LED pulse of the seed source laser described in Synchronization Control and the logical light pulse of described external intensity modulator.
2. Picopulse optical fiber laser according to claim 1, is characterized in that: described seed source laser is that output center wavelength is the distributed feed-back DFB formula semiconductor laser of 1000-1100nm scope.
3. Picopulse optical fiber laser according to claim 1, is characterized in that: described external intensity modulator is the mach zhender Mach-Zender interfere type intensity modulator that lithium niobate material is made.
4. Picopulse optical fiber laser according to claim 1, is characterized in that: described bundling device comprises forward direction bundling device and backward bundling device, and on the bundling device described in each, welding has at least one pump laser.
5. one kind according to the pulse generation method of the Picopulse optical fiber laser described in claim 1~4, it is characterized in that: described seed source laser driver and external intensity modulator driver carry out impulsive synchronization triggering by described synchronous and time delay controller respectively, and by described synchronous and time delay controller, adjust relative time delay of described LED pulse and logical light pulse, the pulse center of the seed source laser described in making substantially overlaps with the logical light pulse center of intensity modulator in time-domain.
6. the pulse generation method of Picopulse optical fiber laser according to claim 5, it is characterized in that: be set in described relative time delay in the pulsewidth time range of LED pulse, when the dislocation time surpasses described scope, described synchronous and time delay controller starts set-up procedure.
7. one kind according to the pulse generation method of the Picopulse optical fiber laser described in claim 1~4, it is characterized in that: described seed source laser driver is production burst signal voluntarily, export the synchronous signal of telecommunication that triggers to described external intensity modulator driver simultaneously, make it that lock-out pulse occur, and by relative time delay of described synchronous and two kinds of pulses of time delay controller adjustment, the LED pulse of seed source laser is substantially overlapped in time-domain with the logical light pulse center of intensity modulator.
8. the pulse generation method of Picopulse optical fiber laser according to claim 7, it is characterized in that: be set in the pulsewidth of LED pulse described relative time delay in the time, when the dislocation time surpasses described pulsewidth, described synchronous and time delay controller starts set-up procedure.
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CN109634026A (en) * | 2019-01-07 | 2019-04-16 | 中国科学院合肥物质科学研究院 | A kind of implementation method of high speed optical shutter |
CN111277248A (en) * | 2020-04-03 | 2020-06-12 | 中国科学院近代物理研究所 | Multi-working-mode synchronous pulse generating device and working method thereof |
CN112636133A (en) * | 2020-11-13 | 2021-04-09 | 香港理工大学深圳研究院 | External cavity modulation method with variable free spectral range and swept-frequency laser |
TWI807570B (en) * | 2022-01-03 | 2023-07-01 | 美康生物科技有限公司 | How to adjust picosecond laser system |
CN117650427A (en) * | 2024-01-30 | 2024-03-05 | 苏州密尔光子科技有限公司 | Pulse group modulation circuit, laser driving device and laser |
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