CN104158075A - Super Gaussian pulse generation method and device on basis of gain reshaping - Google Patents
Super Gaussian pulse generation method and device on basis of gain reshaping Download PDFInfo
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- CN104158075A CN104158075A CN201410381723.0A CN201410381723A CN104158075A CN 104158075 A CN104158075 A CN 104158075A CN 201410381723 A CN201410381723 A CN 201410381723A CN 104158075 A CN104158075 A CN 104158075A
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Abstract
A super Gaussian pulse generation method on the basis of gain reshaping includes the following steps: firstly, a wideband linear chirp laser pulse is generated, and the central wavelength of the wideband linear chirp laser pulse is adjusted to be longer than the intrinsic emission line peak wavelength of the doped gain ion of an optical fiber amplifier; secondly, the gain-narrowed lower triangular chirp laser pulse is obtained after the linear chirp laser pulse is gain amplified by a pre-amplifier selected with the gain coefficient spectral lines all presenting triangular shapes; finally, the super Gaussian pulse is formed by injecting the lower triangular chirp pulse into a main amplifier selected with the gain optical fiber length being 1 to 3 times of that of the pre-amplifier and the central wavelength of the gain spectrum lines being longer than the pre-amplifier. The device capable of realizing the method comprises an optical fiber femtosecond laser oscillator (9-1), a dispersion compensator (9-2), an optical fiber self-similarity pulse amplifier (9-3), a positive dispersion optical fiber pulse stretcher (9-4), a frequency spectrum filter (10), and a front optical fiber amplifier (11) with at least one stage and a main optical fiber amplifier (12).
Description
Technical field
The invention belongs to ultrafast laser technique field, relate to a kind of high power high s/n ratio broadband super-Gaussian method for generating pulse, and the device of realizing the method.
Background technology
Fiber-optical ultrashort pulse laser system can be exported femtosecond (fs, 10 of high-average power, high repetition frequency
-15s) laser pulse, there is excellent beam quality and stability simultaneously, in scientific experiment and field of industrial production, obtain broad research, become the basic subjects such as physics, chemistry, the big science engineerings such as the synchronous light source of a new generation, inertial confinement fusion, high-accuracy optical measurement, biomedical imaging, the powerful of the area researches such as ultraprecise operation and micro-nano industrial processes.With take the blocks of solid laser system that titanium jewel is representative and compare, high-power fiber laser also has cheap, simple and compact for structure, easy to operate waits outstanding advantage, is more suitable for practical application.But the nonlinear effect that the waveguiding structure that optical fiber is elongated brings strengthens, make pulse energy, pulse duration and the peak power index of the output of optical fiber fs-laser system all lag behind titanium jewel system.In recent years, optical parameter amplification (OPA) technology that Yb dosed optical fiber chirped pulse amplifies the pumping of (CPA) system is showing very big advantage aspect the femto-second laser pulse of output high-average power, narrow pulse width, high-peak power, high repetition frequency and tunable wave length, and than solid laser pump system, the cramped construction of fibre system more can meet the application demand in the fields such as basic scientific research and industrial processes, and the pump light pulse with the super-Gaussian time domain shape of flat-top can effectively improve conversion efficiency and the gain bandwidth of OPA process.
In recent years, multiple active laser pulse forming systems such as liquid crystal spatial light phase modulator (LC-SLM), electrooptic modulator (EOM), acousto-optic Dispersion filter able to programme (AOPDF) has been used to optical fiber amplification system, or inhibition nanosecond (ns, 10
-9s) the pulse distortion of level super-Gaussian pulse under optical fiber amplifier saturation effect, or pulse distortion and the nonlinear phase accumulation of compensating wide band pulse under gain narrowing effect, at generation high power flat-top laser pulse and elimination, go to the aspects such as chirped pulse substrate to obtain remarkable achievement.But, this by introducing the active pulse shaping methods of additional passive discrete component, the incident light average power that can not only bear is lower, and spectrum width is limited, and brought extra power loss and bandwidth loss for amplification system, and be unfavorable for the wideband pulse output of high power high s/n ratio.In addition, the feedback control algorithm that this type of orthopedic systems adopts is more complicated mostly, and system takes up room greatly, optical path adjusting difficulty, increase greatly system cost and complexity, also lost thus the topmost advantage of optical fiber Femtosecond Laser Amplification System, be unfavorable for practical application.
Therefore, do not introduce any additional shaping element, directly from fiber amplifier, obtain broadband (>20nm) the super-Gaussian pulse of high power (>100W) high s/n ratio (>40dB), OPA technical development for the pumping of optical fiber CPA system is significant, is one of key technology breaking through optical fiber Femtosecond Laser Amplification System output pulse width and peak power bottleneck.
Summary of the invention
The technical problem that the present invention solves is: overcome the deficiencies in the prior art, a kind of high power high s/n ratio broadband super-Gaussian method for generating pulse based on gain shaping is provided and has realized the device of the method, do not need discrete active laser pulse forming system, without secondary power loss and bandwidth loss, simple to operate, conveniently expand to multistage structure for amplifying, can realize the broadband super-Gaussian pulse output of high power and high s/n ratio.
Technical solution of the present invention is: the super-Gaussian method for generating pulse based on gain shaping, comprises the steps:
(1) produce the linear chrip laser pulse that band is wider than 20nm;
(2) adjust the centre wavelength of described linear chrip laser pulse, make the peak wavelength of the intrinsic spectral line of emission of its gain ion of being longer than fiber amplifier doping;
(3) choose at least one fiber amplifier as one-level preamplifier, adjust gain fibre length and the pumping light power of preamplifiers at different levels, make the gain coefficient spectral line of each preamplifier all be now triangle;
(4) the linear chrip laser pulse of adjusting after centre wavelength is sequentially passed through to preamplifiers at different levels, utilize the gain shaping operation of preamplifier self, change the frequency-domain and time-domain shape of adjusting the linear chrip laser pulse after centre wavelength, obtain the lower triangle chirped pulse of gain narrowing;
(5) choose a fiber amplifier as main amplifier, adjust the gain fibre length of main amplifier, the gain fibre length that makes main fiber amplifier is 1～3 times of preamplifier fiber lengths, adjust the pumping light power of main amplifier, the gain spectrum centre wavelength that makes the gain spectrum centre wavelength of main amplifier be longer than preamplifier simultaneously;
(6) the lower triangular pulse of described gain narrowing is injected to main amplifier, utilize the gain shaping operation of main amplifier, described lower triangle chirped pulse is carried out to power amplification and shaping pulse, form the pulse of super-Gaussian shape.
Described gain ion is ytterbium ion.The centre wavelength of described linear chrip laser pulse is 1040～1060nm.The gain fibre length of described preamplifier is 1.5m～2.0m.
Super-Gaussian pulse generating device based on gain shaping, comprise optical fiber femtosecond laser oscillator, dispersion compensator, optical fiber similarity pulse amplifier, positive dispersion fiber pulse stretcher, spectrum filter, the at least preposition fiber amplifier of one-level and main fiber amplifier, wherein the gain coefficient spectral line of preposition fiber amplifier presents lower triangle, the gain fibre length of main fiber amplifier is 1～3 times of gain fibre length of preposition fiber amplifier, the gain spectrum centre wavelength that the gain spectrum centre wavelength of main fiber amplifier is longer than preposition fiber amplifier simultaneously, optical fiber femtosecond laser oscillator produces stable dissipation soliton pulse sequence, the pulse duration of dispersion compensator adjustment dissipation soliton pulse sequence and warbling, dissipation soliton pulse sequence after optical fiber similarity pulse amplifier is exchanged whole pulse width and warbled is carried out spectrum widening and power amplification, form parabola shaped linear-chirped-pulse, positive dispersion fiber pulse stretcher carries out broadening to parabola shaped linear-chirped-pulse in time domain, generates the large linear chrip laser pulse for the treatment of shaping, the centre wavelength of the large linear chrip laser pulse of spectrum filter adjustment, make it be longer than the peak wavelength of the fiber amplifier doping gain ion intrinsic spectral line of emission, and just whole pulse is shaped as nearly super-Gaussian shape, preposition fiber amplifier is to the pulse of the nearly super-Gaussian shape amplification that gains, the lower triangle chirped pulse that output gain narrows, main fiber amplifier is to the amplification that again gains of lower triangle chirped pulse, the pulse of output super-Gaussian shape.
Described optical fiber femtosecond laser oscillator is optical fiber soliton mode-locked laser, fiber respiratory orphan mode-locked laser, or optical fiber dissipation orphan mode-locked laser.Described dispersion compensator is grating pair or negative dispersion optical fiber dispersion compensator.Described optical fiber similarity pulse amplifier is Yb dosed optical fiber similarity pulse amplifier.Described positive dispersion fiber pulse stretcher is positive dispersion ordinary optic fibre or photonic crystal fiber.Described preposition fiber amplifier or main fiber amplifier are ytterbium doped optical fiber amplifier.
The present invention's advantage is compared with prior art:
(1) the inventive method and device directly utilize the gain shaping operation of fiber amplifier self, without any need for additional discrete active laser pulse forming system, therefore do not introduce extra power loss and spectral bandwidth loss, simple in structure, easy to operate, operating cost is low, conveniently expand to multistage structure for amplifying, can produce broadband (>20nm) the super-Gaussian pulse of high power (>100W) and high s/n ratio (>40dB);
(2) in apparatus of the present invention, first by optical fiber femtosecond laser oscillator, produce soliton pulse sequence, by optical fiber self similarity amplifier, generate the parabolic pulses with linear chrip again, not only amplified soliton pulse power, and broadening optimized soliton pulse spectrum, reduce thus the high request of system to optical fiber femtosecond laser oscillator output pulse quality and power, reduced the noise of system, improved the stability of system; The risk of introducing non-linear chirp when the parabolic shape of the pulse of self similarity amplification simultaneously has also been avoided adopting optical fiber as pulse stretcher, is conducive to full fiberize and the miniaturization of system, can provide the broadband that spectrum is level and smooth large linear chrip laser pulse;
(3) the inventive method and device also stand good for the gain saturation situation under high pulse energy, and now pulse front edge will obtain than rear along high gain.For positive chirped pulse, long wavelength's part will obtain than the larger gain of short wavelength's part, when lower triangular pulse that preamplifier state output gain narrows, the main amplifier gain center of the deflection long wave that gain saturation is brought, still lower triangular pulse can be shaped as to broadband super-Gaussian pulse, can produce the broadband super-Gaussian pulse of high-energy (millijoule magnitude);
(4) method provided by the invention and device, can be directly from the super-Gaussian pulse of warbling of the wide-band linearity of fiber amplifier output high-power high s/n ratio, as pump light pulse, can effectively improve conversion efficiency and the gain bandwidth of OPA process, reduce gain narrowing effect, obtain narrower femto-second laser pulse and wider wavelength tuning range, the output performance index that promotes OPA system realizes fiberize and the miniaturization of OPA system simultaneously;
(5) the inventive method and device can recover inceptive impulse spectral width when obtaining high-gain and signal to noise ratio, therefore can also, for reducing the restriction of gain narrowing effect to optical fiber CPA system output femto-second laser pulse spectral width, pulse energy and pulse duration, when improving optical fiber CPA system gain amplifier, obtain the femto-second laser pulse of high repetition frequency, high-peak power.
Accompanying drawing explanation
Fig. 1 is the principle schematic of the inventive method;
Fig. 2 is the structural representation of apparatus of the present invention;
Fig. 3 is the structural representation of the embodiment of the present invention;
Fig. 4 is triangular pulse spectrum under gain spectrum under high gain state of the embodiment of the present invention preamplifier of numerical simulation and output.In figure: 17 is pregain spectral line, the 18 super-Gaussian pulse spectrum for input, 19 for amplifying the lower triangular pulse spectrum of output;
Fig. 5 is warble super-Gaussian pulse spectrum and corresponding main amplifier gain spectrum of the wide-band linearity of the embodiment of the present invention main amplifier output of numerical simulation.In figure: 20 is rearmounted main amplifier gain spectrum, the 21 lower triangular pulse spectrum for input, 22 for amplifying the super-Gaussian pulse spectrum of output.
Embodiment
The inventive method is directly utilized the gain shaping operation of fiber amplifier self, by regulating gain fibre length and the pump power of amplifiers at different levels, control the gain coefficient spectral line shape of amplifiers at different levels, and then change the frequency-domain and time-domain shape of broadband high-chip laser pulse.When each preamplifier state is operated in high gain state, the lower triangular pulse that output gain narrows can, by controlling pump power, obtain the super-Gaussian shape pulse of high-gain and high output signal-to-noise ratio in the relatively long rearmounted amplifying stage of gain fibre length.
Fiber amplifier, as passive pulse shaper, has tunable transmittance curve and gain, the fiber amplifier small signal gain spectrum G that length is L
0(λ) there is following expression:
From above formula, fiber amplifier small signal gain spectrum is by the Ions Absorption cross section spectrum σ that gains
a(λ), emission cross section spectrum σ
e(λ), fiber lengths L and average inverted population distribute
determine Γ
sfor signal light power fill factor, curve factor,
for upper laser level population is evenly distributed.Wherein
there is following expression:
For doping content N
ybcertain gain fibre, upper laser level population N
2(z)～P
p(z), P
p(z) be that pumping light power is along the distribution of fiber lengths.Pulse spectrum is amplified in output | A (L, λ) |
2incident pulse spectrum | A (0, λ) |
2and G
0(λ) product:
|A(L,λ)|
2＝|A(0,λ)|
2G
0(λ) (3)
Time domain and the frequency domain of large linear-chirped-pulse have similar shape, therefore amplify pulse time domain shape also with G
0(λ) relevant, the gain shaping operation of Here it is chirped pulse amplifier, now, fiber amplifier is equivalent to the passive pulse shaping device with gain.The present invention is by ride gain fiber lengths L and pumping light power P
p(z) carry out control amplifier small signal gain spectrum G
0(λ), and then realize shaping pulse.
The inventive method mainly comprises the following steps:
(1) produce the large linear chrip laser pulse in broadband (>20nm);
(2) adjust the centre wavelength of the large linear chrip laser pulse in broadband, make it be longer than the peak wavelength of the intrinsic spectral line of emission of fiber amplifier doping gain ion;
(3) preposition fiber amplifier adopts short gain fibre and high pumping luminous power, makes the gain coefficient spectral line of preposition fiber amplifier present lower triangle.Make each preamplifier be operated in high gain state, utilize the gain shaping operation of preposition fiber amplifier self, change the frequency-domain and time-domain shape of the large linear chrip laser pulse in broadband, the lower triangular pulse that output gain narrows;
(4) finally lower triangular pulse is injected to main fiber amplifier, the gain fibre length of main fiber amplifier is 1～3 times of preposition fiber amplifier fiber lengths, control the pumping light power of main fiber amplifier, make its gain spectrum centre wavelength be longer than preposition fiber amplifier, utilize the gain shaping operation of main fiber amplifier to carry out power amplification and shaping pulse to lower triangle chirped pulse, the super-Gaussian shape pulse of final output high-power and high s/n ratio.
The principle of the inventive method as shown in Figure 1.In figure, X-axis represents laser pulse traffic direction, and Y-axis represents optical maser wavelength, and Z axis represents laser intensity.The large linear chrip seed pulse 1 in broadband, first by spectral filtering 2, make its spectrum 3 centre wavelengths be longer than the peak wavelength of fiber amplifier doping gain ion emission lines 4, guarantee thus in follow-up amplification process, to generate the lower triangular pulse that peak wavelength is positioned at gain emission of ions peak value, control again the pump power of short fiber preamplifiers at different levels, making pregain coefficient spectral lines at different levels is lower triangle 5, utilize the gain shaping of preamplifier to obtain triangle chirped pulse 6 under the gain narrowing of magnification at high multiple, for post amplifier provides shaping pulse in advance, and improve initialize signal power, suppress the spontaneous emission noise in amplification process, improve thus the signal to noise ratio of amplification process, finally control the pump power of the main amplifying stage of rearmounted long optical fibers, make the centre wavelength of its gain spectrum 7 be longer than preamplifier, utilize the gain shaping operation of main amplifying stage to carry out power amplification and shaping pulse to lower triangle chirped pulse, the super-Gaussian shape pulse 8 of final output high-power and high s/n ratio.
As shown in Figure 2, apparatus of the present invention mainly comprise: optical fiber femtosecond laser oscillator 9-1, dispersion compensator 9-2, optical fiber similarity pulse amplifier 9-3, positive dispersion fiber pulse stretcher 9-4, spectrum filter 10, at least preposition fiber amplifier 11 of one-level and main fiber amplifier 12.Wherein, the annexation of each parts is: optical fiber femtosecond laser oscillator 9-1 produces stable arrowband soliton pulse sequence, through dispersion compensator 9-2, adjust pulse duration and warble, be coupled into again in optical fiber self similarity amplifier 9-3 and carry out spectrum widening and power amplification, export parabola shaped wide-band linearity chirped pulse, recycling positive dispersion fiber pulse stretcher 9-4 introduces linear just warbling in time domain broadening pulse, generates thus the large linear chrip laser pulse in broadband for the treatment of shaping.By spectrum filter 10, choose pulse center wavelength, make it be longer than the peak wavelength of the fiber amplifier doping gain ion intrinsic spectral line of emission, and just whole pulse is shaped as nearly super-Gaussian shape, then be coupled at least preposition fiber amplifier 11 of one-level, improve each preposition fiber amplifier 11 pumping light powers, make the gain coefficient spectral line of each preposition fiber amplifier 11 present lower triangle, the lower triangle chirped pulse that output gain narrows, the shaping that gains of last 12 pairs of lower triangular pulses of main fiber amplifier that formed by long gain fibre, regulate the pumping light power of main fiber amplifier 12, make its gain spectrum centre wavelength be longer than preposition fiber amplifier 11, obtain the super-Gaussian shape pulse of high power and high output signal-to-noise ratio.Each amplifier in system (respectively putting fiber amplifier 11 and main fiber amplifier 12 before comprising) is the semiconductor laser diode pumping of coupling fiber output, both can adopt wavelength division multiplexer to be operated in forward pumping mode, and also can adopt dichroic mirror and aspheric surface coupled lens to be operated in backward pump mode.Between system is at different levels, adopt isolator.
In actual use, optical fiber femtosecond laser oscillator 9-1 can select optical fiber soliton mode-locked laser, fiber respiratory orphan mode-locked laser, or optical fiber dissipation orphan mode-locked laser.Dispersion compensator 9-2 can select grating pair or negative dispersion optical fiber dispersion compensator.Optical fiber similarity pulse amplifier 9-3 can select Yb dosed optical fiber similarity pulse amplifier.Positive dispersion fiber pulse stretcher 9-4 can select positive dispersion ordinary optic fibre or photonic crystal fiber.Preposition fiber amplifier 11 and main fiber amplifier 12 all can be selected ytterbium doped optical fiber amplifier.
Embodiment
The present embodiment is realized the high power high s/n ratio super-Gaussian method for generating pulse based on gain shaping by apparatus structure as shown in Figure 3.Full optical fiber femtosecond laser oscillator 13-1 adopts nonlinear polarization rotation or transmission-type saturable absorber to start locked mode, adopt the optical fiber filter of 4～6nm bandwidth that dissipation filtering mechanism stable mode-locking is provided, the arrowband dissipation orphan mode locking pulse sequence of stable output, repetition rate 40MHz～80MHz, average power 50mW～200mW, centre wavelength 1040nm, spectral width 4nm～10nm.Then utilize 0.5m～1.5m negative dispersion optical fiber 13-2 to provide dispersion compensation for soliton pulse, adjust pulse chirp amount and the symbol of warbling, then by optical fiber collimator, be coupled into gain fibre and complete self similarity and amplify and develop; Optical fiber similarity pulse amplifier 13-3 adopts 2～3m Double Cladding Ytterbium Doped Fiber as gain media, core diameter 11 μ m, numerical aperture 0.08, inner cladding diameter 70 μ m, numerical aperture 0.63, the coupling fiber Output of laser diode that employing wavelength is 980nm is as pumping source, and pump light is coupled to gain fibre by wavelength division multiplexer with forward direction pump mode, output parabolic pulses average power 2W～3W, spectral width 30nm～40nm.Again via 50m～60m big mode field area photonic crystal fiber 13-4 in time domain broadening parabolic pulses, generate the large linear chrip laser pulse in broadband treat shaping, pulse full width at half maximum degree 35ps～40ps, average pulse power 0.5W～0.75W.By bandwidth 20nm, the center of seeing through is chosen the also first whole pulse of pulse center wavelength at the spectrum filter 14 of 1040nm and is shaped as nearly super-Gaussian shape, utilize the similitude of large linear chrip wideband pulse time domain and frequency domain, the super-Gaussian pulse of just warbling of the about 20ps of production burst full width at half maximum, average power 0.25W～0.4W; Preamplifier 15 adopts the double cladding large mode field area Yb-doped optical fiber of one-level, fiber lengths 2m, core diameter 25 μ m, numerical aperture 0.08, inner cladding diameter 250 μ m, numerical aperture 0.46, pump light is coupled to gain fibre by optical-fiber bundling device with forward direction pump mode, control amplifier pump power, makes amplifier be operated in the high gain state of 25dB, and numerical simulation result as shown in Figure 4.Now amplifier gain coefficient spectral line is lower triangle 17, utilizes the gain shaping operation of fiber amplifier can produce the lower triangular pulse 19 of gain narrowing, finally the lower triangular pulse of preamplifier output is coupled into the long double cladding large mode field area Yb-doped optical fiber main amplifier 16 of 5m, fiber type is identical with preamplifier state with pumping coupled modes, by adjusting the pump power of amplifier, make the gain spectrum of amplifier be shaped as 20, utilize the gain shaping operation of main amplifier, the lower triangular pulse of preamplifier output 21 can be amplified to also shaping and become broadband super-Gaussian shape pulse 22, as shown in Fig. 5 numerical simulation, now the overall gain of corresponding amplification system is about 30dB, the average power of output super-Gaussian pulse is 200～300W, output signal-to-noise ratio is up to 45dB.
The content not being described in detail in specification of the present invention belongs to those skilled in the art's known technology.
Claims (10)
1. the super-Gaussian method for generating pulse based on gain shaping, is characterized in that comprising the steps:
(1) produce the linear chrip laser pulse that band is wider than 20nm;
(2) adjust the centre wavelength of described linear chrip laser pulse, make the peak wavelength of the intrinsic spectral line of emission of its gain ion of being longer than fiber amplifier doping;
(3) choose at least one fiber amplifier as one-level preamplifier, adjust gain fibre length and the pumping light power of preamplifiers at different levels, make the gain coefficient spectral line of each preamplifier all be now triangle;
(4) the linear chrip laser pulse of adjusting after centre wavelength is sequentially passed through to preamplifiers at different levels, utilize the gain shaping operation of preamplifier self, change the frequency-domain and time-domain shape of adjusting the linear chrip laser pulse after centre wavelength, obtain the lower triangle chirped pulse of gain narrowing;
(5) choose a fiber amplifier as main amplifier, adjust the gain fibre length of main amplifier, the gain fibre length that makes main fiber amplifier is 1～3 times of preamplifier fiber lengths, adjust the pumping light power of main amplifier, the gain spectrum centre wavelength that makes the gain spectrum centre wavelength of main amplifier be longer than preamplifier simultaneously;
(6) the lower triangular pulse of described gain narrowing is injected to main amplifier, utilize the gain shaping operation of main amplifier, described lower triangle chirped pulse is carried out to power amplification and shaping pulse, form the pulse of super-Gaussian shape.
2. the super-Gaussian method for generating pulse based on gain shaping according to claim 1, is characterized in that: described gain ion is ytterbium ion.
3. the super-Gaussian method for generating pulse based on gain shaping according to claim 2, is characterized in that: the centre wavelength of described linear chrip laser pulse is 1040～1060nm.
4. the super-Gaussian method for generating pulse based on gain shaping according to claim 2, is characterized in that: the gain fibre length of described preamplifier is 1.5m～2.0m.
Based on gain shaping super-Gaussian pulse generating device, it is characterized in that comprising: optical fiber femtosecond laser oscillator (9-1), dispersion compensator (9-2), optical fiber similarity pulse amplifier (9-3), positive dispersion fiber pulse stretcher (9-4), spectrum filter (10), the at least preposition fiber amplifier of one-level (11) and main fiber amplifier (12), wherein the gain coefficient spectral line of preposition fiber amplifier (11) presents lower triangle, the gain fibre length of main fiber amplifier (12) is 1～3 times of gain fibre length of preposition fiber amplifier (11), the gain spectrum centre wavelength that the gain spectrum centre wavelength of main fiber amplifier (12) is longer than preposition fiber amplifier (11) simultaneously, optical fiber femtosecond laser oscillator (9-1) produces stable dissipation soliton pulse sequence, dispersion compensator (9-2) is adjusted the pulse duration of dissipation soliton pulse sequence and is warbled, dissipation soliton pulse sequence after optical fiber similarity pulse amplifier (9-3) is exchanged whole pulse width and warbled is carried out spectrum widening and power amplification, form parabola shaped linear-chirped-pulse, positive dispersion fiber pulse stretcher (9-4) carries out broadening to parabola shaped linear-chirped-pulse in time domain, generates the large linear chrip laser pulse for the treatment of shaping, spectrum filter (10) is adjusted the centre wavelength of large linear chrip laser pulse, make it be longer than the peak wavelength of the fiber amplifier doping gain ion intrinsic spectral line of emission, and just whole pulse is shaped as nearly super-Gaussian shape, preposition fiber amplifier (11) is to the pulse of the nearly super-Gaussian shape amplification that gains, the lower triangle chirped pulse that output gain narrows, main fiber amplifier (12) is to the amplification that again gains of lower triangle chirped pulse, the pulse of output super-Gaussian shape.
According to claim 5 based on gain shaping super-Gaussian pulse generating device, it is characterized in that: described optical fiber femtosecond laser oscillator (9-1) is optical fiber soliton mode-locked laser, fiber respiratory orphan mode-locked laser, or optical fiber dissipation orphan mode-locked laser.
7. the super-Gaussian pulse generating device based on gain shaping according to claim 5, is characterized in that: described dispersion compensator (9-2) is grating pair or negative dispersion optical fiber dispersion compensator.
8. the super-Gaussian pulse generating device based on gain shaping according to claim 5, is characterized in that: described optical fiber similarity pulse amplifier (9-3) is Yb dosed optical fiber similarity pulse amplifier.
9. the super-Gaussian pulse generating device based on gain shaping according to claim 5, is characterized in that: described positive dispersion fiber pulse stretcher (9-4) is positive dispersion ordinary optic fibre or photonic crystal fiber.
10. the super-Gaussian pulse generating device based on gain shaping according to claim 5, is characterized in that: described preposition fiber amplifier (11) or main fiber amplifier (12) are ytterbium doped optical fiber amplifier.
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| CN106207736B (en) * | 2015-05-27 | 2018-10-30 | 朗美通瑞士股份公司 | light source with passive pulse shaping |
| CN105390912A (en) * | 2015-12-10 | 2016-03-09 | 中国空间技术研究院 | Pre-chirped management based low-noise fiber femtosecond laser amplifier |
| CN109478761A (en) * | 2016-06-03 | 2019-03-15 | Km实验室股份有限公司 | The starting and optimization of laser mode locking are used for using electronic control polarizer |
| CN106229797A (en) * | 2016-08-31 | 2016-12-14 | 上海交通大学 | For producing the fiber optic loop time lens combination of STUD pulse |
| CN109039466B (en) * | 2018-08-07 | 2020-12-01 | 吉林大学 | High-stability optical soliton generator based on erbium-doped fiber laser |
| CN109039466A (en) * | 2018-08-07 | 2018-12-18 | 吉林大学 | A kind of high stability soliton generator based on erbium doped fiber laser |
| CN111064069A (en) * | 2019-12-29 | 2020-04-24 | 北京工业大学 | All-fiber femtosecond chirped pulse amplification system |
| CN111064069B (en) * | 2019-12-29 | 2024-05-28 | 北京工业大学 | All-fiber femtosecond chirped pulse amplification system |
| CN111983871A (en) * | 2020-09-03 | 2020-11-24 | 山西大学 | All-optical amplification method of optical soliton pulse train |
| CN112582872A (en) * | 2020-12-10 | 2021-03-30 | 上海飞博激光科技有限公司 | Functional module and method for inhibiting waveform distortion |
| CN113991403A (en) * | 2021-12-27 | 2022-01-28 | 山东省科学院激光研究所 | Femtosecond optical fiber amplification system |
| CN113991403B (en) * | 2021-12-27 | 2022-10-11 | 山东省科学院激光研究所 | Femtosecond optical fiber amplification system |
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