CN109494552A - A kind of full optical fiber laser system and method generating high-energy rectangular pulse - Google Patents
A kind of full optical fiber laser system and method generating high-energy rectangular pulse Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06725—Fibre characterized by a specific dispersion, e.g. for pulse shaping in soliton lasers or for dispersion compensating [DCF]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
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- 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
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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
- H01S3/108—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 non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
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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
- H01S3/1106—Mode locking
- H01S3/1112—Passive mode locking
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Abstract
The invention discloses a kind of full optical fiber laser system and methods for generating high-energy rectangular pulse, it is intended to solve existing fiber laser and be difficult to the technical issues of being directly realized by the output of high-energy rectangular laser pulse.The system comprises sequentially connected passive mode-locking fiber laser (1), isolator (2), fiber amplifier (3), the first general single mode fiber (4), highly nonlinear optical fiber (5), programmable optical filter (6) and the second general single mode fibers (7).The present invention has simple and compact for structure, the advantages that stability is good, by adjusting the pump power of fiber amplifier (3) and the filtering bandwidth of programmable optical filter (6), it is able to achieve the adjustable high-energy rectangular laser pulse output of pulse width, greatly reduce system cost, application above can directly as picosecond and nanosecond rectangular pulse light source, can also be used as the seed source of high energy pulse amplifier.
Description
Technical field
The invention belongs to laser technology fields, and in particular to a kind of full optical fiber laser system for generating high-energy rectangular pulse
And the design of method.
Background technique
The ultrashort pulse fiber laser of high-energy is in optic communication, optical sensing, precision machinery processing, biomedical, state
Anti- military affairs etc. are widely used.Ultrashort pulse is generally obtained using mode-locking technique, mode-locking technique is broadly divided into actively
Mode locking and two kinds of passive mode-locking.Compared to active mode locking, passive mode-locking technology additionally introduces modulator due to not needing, and has knot
Structure is simple and compact, is easily achieved the advantages such as all-fiber, is the research hotspot of laser field.
Passive mode-locking technology is to realize mode locking using the nonlinear loss characteristic of saturable absorber.The basic principle is that sharp
With the nonlinear optical effect of optical fiber or other devices to the intensity dependence of input pulse, phase is locked between realizing intracavitary each longitudinal mode
It is fixed, and then obtain ultrashort pulse.Various mode-locking techniques, as nonlinear polarization rotation (NPR), semiconductor saturable absorber mirror,
Carbon nanotube and two-dimensional material, such as graphene, transient metal sulfide, topological insulator have been employed successfully in realization
Stable mode locking pulse output.
When it is intracavitary only contain negative dispersion optical fiber when, under the action of negative GVD and nonlinear effect, mode locking pulse
It will be shaped as traditional soliton pulse, but due to the limitation of orphan's area theory, single pulse energy is usually less than 0.1nJ.For
Further increase pulse energy, researcher is by intracavitary introducing positive dispersion fiber, so that laser works are in net countenance
Scattered or Totally positive dispersion area, obtains a kind of novel soliton pulse, i.e. dissipative solitons pulse.It is different from traditional soliton pulse, it dissipates
The formation of soliton pulse is the coefficient result such as interacvity gain, loss, dispersion and nonlinear effect.The typical orphan that dissipates
The time-domain shape of subpulse is gaussian-shape, and spectral shape is approximately rectangle.This pulse resists what light wave divided with stronger
Feature, single pulse energy is up to tens nJ.Although by changing intracavitary net dispersion value, the energy for exporting mode locking pulse is shown
It writes and improves, but under normal circumstances, the time-domain shape that passive mode-locking fiber laser exports pulse is gaussian-shape or hyperbolic secant shape.
Rectangle light pulse is suffered from fields such as optic communication, fiber grating, ultra-fast opticals and is widely applied.Rectangle light pulse
It is to be obtained in semiconductor laser, but pulse has longer rising edge and a failing edge earliest, hot spot and pulse quality are not yet
It is good, seriously limit its application.In recent years, the passive mode-locking fiber laser based on NPR technology utilizes dissipative solitons resonance machine
Reason realizes rectangular laser pulse output, but compared to gaussian-shape mode locking pulse, rectangle light pulse only meets in laser special
It could be obtained when determining Parameter Conditions and operating condition, which greatly increases the debugging difficulties of system, simultaneously because being locked using NPR
Mould technology, system stability are easily affected by the external environment, this is also unfavorable for the practical application of system.
Summary of the invention
The purpose of the present invention is to solve be difficult to directly export high-energy rectangular laser pulse in existing fiber laser
The problem of, propose a kind of full optical fiber laser system and method for generating high-energy rectangular pulse.
The technical solution of the present invention is as follows: a kind of full optical fiber laser system for generating high-energy rectangular pulse, including successively connect
It is the passive mode-locking fiber laser that connects, isolator, fiber amplifier, the first general single mode fiber, highly nonlinear optical fiber, programmable
Optical filter and the second general single mode fiber；The programmable optical filter is used for highly nonlinear optical fiber output optical pulse
Light spectrum reshaping be rectangle；The spectrum that second general single mode fiber is used to export programmable optical filter is rectangle
Pulse transition is the light pulse that time domain is rectangle.
Preferably, passive mode-locking fiber laser is that er-doped modelocked fiber of the work in net positive dispersion or Totally positive dispersion area swashs
Light device exports as dissipative solitons pulse, and pulse temporal shape is gaussian-shape, and corresponding spectral shape is approximately rectangle, output
The central wavelength lambda of pulse are as follows: 1550nm exports pulse recurrence frequency in MHz magnitude.
Preferably, isolator is polarization independent optical isolator, for the reflecting light of fiber amplifier to be isolated, prevents from reflecting
Light even destroys mode locking operating back to interference in passive mode-locking fiber laser.
Preferably, fiber amplifier is erbium-doped fiber amplifier.
Preferably, the length of the first general single mode fiber is 75m, has negative dispersion at 1550nm.
Preferably, the length of highly nonlinear optical fiber is 100m, has nearly zero negative dispersion at 1550nm.
Preferably, the filtering bandwidth range of programmable optical filter meets: 1nm≤FBW≤70nm。
Preferably, the length of the second general single mode fiber is 10km, has negative dispersion at 1550nm.
The invention also provides a kind of methods for generating high-energy rectangular pulse, comprising the following steps:
S1, when passive mode-locking fiber laser pump power be more than modelocking threshold after, laser interacvity gain, damage
Realize that stable mode locking pulse output, output pulse are typical dissipate under the collective effects such as consumption, dispersion and nonlinear effect
Orphan, pulse temporal shape are gaussian-shape, and corresponding spectral shape is approximately rectangle；
S2, the output pulse energy in order to further increase passive mode-locking fiber laser, the dissipative solitons output it
Pulse input carries out power amplification into fiber amplifier；
S3, there is biggish positive chirp through the amplified pulse of fiber amplifier, pulse width in picosecond magnitude, in order to
The femtosecond pulse for obtaining high-peak power, the output pulse input of fiber amplifier is passed into the first general single mode fiber
Defeated, under the effect of negative GVD effect, the pulse width of the first general single mode fiber output pulse is compressed into femtosecond amount
Grade, peak power can reach kW magnitude；
S4, the high-peak power femtosecond pulse that the first general single mode fiber exports is input in highly nonlinear optical fiber and is carried out
Transmission can cause such as when transmitting in highly nonlinear optical fiber from phase since incident pulse has very high peak power
The nonlinear effects such as modulation, stimulated Raman scattering, four-wave mixing, simultaneously because optical fiber has nearly zero negative dispersion, pulse is being transmitted
It can be always maintained at higher peak power in the process, thus continuously by the effect of nonlinear effect；Finally, Gao Fei
The spectral width of linear optical fiber output pulse broadens rapidly compared to incident pulse；
S5, step S4 also will be flat at the top of inevitable reduction spectrum during broadening pulse spectrum
Degree makes for this purpose, the wide spectrum pulse input that highly nonlinear optical fiber exports is carried out light spectrum reshaping into programmable optical filter
The spectrum for obtaining programmable optical filter output pulse becomes rectangle, while its spectral width can pass through adjusting fiber amplifier
Pump power and the filtering bandwidth of programmable optical filter change；
S6, programmable optical filter output optical pulse is input in the second general single mode fiber and is transmitted, in light
Under fine group velocity dispersion effect effect, gradually broadened when pulse is transmitted in a fiber, while optical fiber is applied to pulse one
Linear frequency chirp；When the dispersion measure of optical fiber accumulation is sufficiently large, the time-domain shape that the second general single mode fiber exports pulse will
It is identical as the programmable optical filter output spectral shape of pulse；Since the spectrum of programmable optical filter output pulse is
Rectangle, thus under the effect of the strong dispersion effect of accumulation, the time-domain shape of the second general single mode fiber output pulse also should be square
Shape, and its pulse width for exporting pulse is determined by the spectral width of programmable optical filter output pulse, to realize arteries and veins
Rush broad-adjustable high-energy rectangular laser pulse output.
The beneficial effects of the present invention are:
(1) device used in the present invention is commonplace components, all commercializations, so that method of the invention is easy to implement.
(2) present invention uses all optical fibre structure, good beam quality, good heat dissipation, without collimation.
(3) the advantages that present invention has simple and compact for structure, easy to operate, and stability is good.
(4) present invention is able to achieve pulse width adjustable high-energy rectangular laser pulse output, greatly reduce system at
This, application above can directly as picosecond and nanosecond rectangular pulse light source, also can be used as the kind of high energy pulse amplifier
Component uses.
Detailed description of the invention
Fig. 1 is a kind of full optical fiber laser system structure diagram for generating high-energy rectangular pulse provided by the invention.
Fig. 2 is the spectral shape figure that pulse is exported through programmable optical filter of the embodiment of the present invention.
Fig. 3 is the time-domain shape figure that pulse is exported through the second general single mode fiber of the embodiment of the present invention.
Description of symbols: 1-passive mode-locking fiber laser, 2-isolators, 3-fiber amplifiers, 4-the first general
Logical single mode optical fiber, 5-highly nonlinear optical fibers, 6-programmable optical filters, the 7-the second general single mode fiber.
Specific embodiment
The embodiment of the present invention is further described with reference to the accompanying drawing.
The present invention provides a kind of full optical fiber laser systems for generating high-energy rectangular pulse, as shown in Figure 1, including successively
Passive mode-locking fiber laser 1, isolator 2, fiber amplifier 3, the first general single mode fiber 4, highly nonlinear optical fiber of connection
5, programmable optical filter 6 and the second general single mode fiber 7.
In the embodiment of the present invention, passive mode-locking fiber laser 1 is that er-doped modelocked fiber of the work in net positive dispersion area swashs
Light device exports as dissipative solitons pulse, and pulse temporal shape is gaussian-shape, and corresponding spectral shape is approximately rectangle, output
The central wavelength lambda of pulse are as follows: 1550nm exports pulse recurrence frequency in MHz magnitude.
Isolator 2 prevents reflected light from returning for polarization independent optical isolator for the reflecting light of fiber amplifier 3 to be isolated
It returns to interference in passive mode-locking fiber laser 1 and even destroys mode locking operating.
Fiber amplifier 3 is erbium-doped fiber amplifier.
The general single mode fiber of Nufern company, U.S. production can be used in first general single mode fiber 4, and total length is
75m, its abbe number β at 1550nm2For -23ps2/km。
The high-performance highly nonlinear optical fiber of Chinese Chang Fei company production can be used in highly nonlinear optical fiber 5, and total length is
100m, its non-linear parameter γ is 11/W/km, abbe number β at 1550nm2For -1ps2/km。
The programmable optical filter of Finisar company, U.S. production, cake resistancet can be used in programmable optical filter 6
Wide scope meets: 1nm≤FBW≤70nm。
The general single mode fiber of Nufern company, U.S. production can be used in second general single mode fiber 7, and total length is
10km, its abbe number β at 1550nm2For -23ps2/km。
Main operational principle involved in the present invention is specific as follows:
When the light pulse that the spectral shape that programmable optical filter 6 exports is rectangle is in the second general single mode fiber 7
When transmission, if input the second general single mode fiber 7 pulse amplitude envelope be u (0, t), corresponding Fourier transformation be u (0,
ω)；Transmission of the light pulse in the second general single mode fiber 7 meets following equation:
In formula, u (z, ω) indicates the Fourier transformation of amplitude envelope u (z, t) at a certain position z in a fiber.
It is available by formula (1):
When | β2Z | when sufficiently large, formula (2) be can be approximated to be:
In formula, t and ω meet relationship:
T=ω β2z (4)
From formula (3) as can be seen that working as | β2Z | when sufficiently large, the second general single mode fiber 7 export pulse time-domain shape with
The spectral shape that programmable optical filter 6 exports pulse is identical.When the filtering bandwidth range of programmable optical filter 6 is full
Foot: 1nm≤FBWWhen≤70nm, the pulse width that the second general single mode fiber 7 exports pulse meets: 0.2ns≤Δ T≤13ns,
It can be by adjusting the pump power of fiber amplifier 3 and the filtering bandwidth realization rectangular pulse of programmable optical filter 6
Pulse width picosecond be continuously adjusted in nano-seconds.
The present invention also provides a kind of methods for generating high-energy rectangular pulse, comprising the following steps:
S1, when passive mode-locking fiber laser 1 pump power be more than modelocking threshold after, laser interacvity gain, damage
Realize that stable mode locking pulse output, output pulse are typical dissipate under the collective effects such as consumption, dispersion and nonlinear effect
Orphan, pulse temporal shape are gaussian-shape, and corresponding spectral shape is approximately rectangle；
S2, the output pulse energy in order to further increase passive mode-locking fiber laser 1, the dissipative solitons output it
Pulse input carries out power amplification into fiber amplifier 3；
S3, there is biggish positive chirp through the amplified pulse of fiber amplifier 3, pulse width is in picosecond magnitude
The femtosecond pulse for obtaining high-peak power, by the output pulse input of fiber amplifier 3 into the first general single mode fiber 4 into
Row transmission, under the effect of negative GVD effect, the pulse width of the first general single mode fiber 4 output pulse is compressed into winged
Second-time, peak power can reach kW magnitude；
S4, by the high-peak power femtosecond pulse that the first general single mode fiber 4 exports be input in highly nonlinear optical fiber 5 into
Row transmission can cause such as when transmitting in highly nonlinear optical fiber 5 from phase since incident pulse has very high peak power
The nonlinear effects such as position modulation, stimulated Raman scattering, four-wave mixing, simultaneously because optical fiber has nearly zero negative dispersion, pulse is being passed
It can be always maintained at higher peak power during defeated, thus continuously by the effect of nonlinear effect；Finally, high
The spectral width that nonlinear optical fiber 5 exports pulse broadens rapidly compared to incident pulse；
S5, step S4 also will be flat at the top of inevitable reduction spectrum during broadening pulse spectrum
Degree, for this purpose, the wide spectrum pulse input that highly nonlinear optical fiber 5 is exported carries out light spectrum reshaping into programmable optical filter 6,
So that the spectrum that programmable optical filter 6 exports pulse becomes rectangle, while its spectral width can be by adjusting fiber amplifier
The pump power of device 3 and the filtering bandwidth of programmable optical filter 6 change；
S6,6 output optical pulse of programmable optical filter is input in the second general single mode fiber 7 and is transmitted,
Under the group velocity dispersion effect effect of optical fiber, gradually broadened when pulse is transmitted in a fiber, while optical fiber is applied to pulse one
A linear frequency chirp；When the dispersion measure of optical fiber accumulation is sufficiently large, the second general single mode fiber 7 exports the time-domain shape of pulse
It is identical by the spectral shape of pulse is exported with programmable optical filter 6；Since programmable optical filter 6 exports the light of pulse
Spectrum is rectangle, thus under the effect of the strong dispersion effect of accumulation, the time-domain shape of the second general single mode fiber 7 output pulse is also answered
Pulse width for rectangle, and its output pulse is determined by the spectral width that programmable optical filter 6 exports pulse, thus real
The existing adjustable high-energy rectangular laser pulse output of pulse width.
To it is provided by the invention it is a kind of generate high-energy rectangular pulse method in step S6 carried out numerical simulation, tie
Fruit is as follows:
It is the spectral shape through programmable optical filter output pulse shown in Fig. 2.It therefrom can be clearly seen that, pass through
The spectrum of light spectrum reshaping, programmable optical filter output optical pulse becomes rectangle.
It is the time-domain shape through the output pulse of the second general single mode fiber shown in Fig. 3.It can be seen that common single by second
After mode fiber transmission, output pulse temporal shape becomes rectangle.
Those of ordinary skill in the art will understand that the embodiments described herein, which is to help reader, understands this hair
Bright principle, it should be understood that protection scope of the present invention is not limited to such specific embodiments and embodiments.This field
Those of ordinary skill disclosed the technical disclosures can make according to the present invention and various not depart from the other each of essence of the invention
The specific variations and combinations of kind, these variations and combinations are still within the scope of the present invention.
Claims (9)
1. a kind of full optical fiber laser system for generating high-energy rectangular pulse, which is characterized in that including sequentially connected passive lock
Mode fiber laser (1), isolator (2), fiber amplifier (3), the first general single mode fiber (4), highly nonlinear optical fiber (5),
Programmable optical filter (6) and the second general single mode fiber (7)；The programmable optical filter (6) is used for will be high non-thread
Property optical fiber (5) output optical pulse light spectrum reshaping be rectangle；Second general single mode fiber (7) is for filtering programmable optical
It is the light pulse that time domain is rectangle that the spectrum of wave device (6) output, which is the pulse transition of rectangle,.
2. a kind of full optical fiber laser system for generating high-energy rectangular pulse according to claim 1, which is characterized in that institute
Stating passive mode-locking fiber laser (1) is er-doped mode locked fiber laser of the work in net positive dispersion or Totally positive dispersion area, output
For dissipative solitons pulse, pulse temporal shape is gaussian-shape, and corresponding spectral shape is approximately rectangle, exports the center of pulse
Wavelength X are as follows: 1550nm exports pulse recurrence frequency in MHz magnitude.
3. a kind of full optical fiber laser system for generating high-energy rectangular pulse according to claim 1, which is characterized in that institute
State isolator (2) prevents reflected light from returning for polarization independent optical isolator for the reflecting light of fiber amplifier (3) to be isolated
Mode locking operating is even destroyed to interference in passive mode-locking fiber laser (1).
4. a kind of full optical fiber laser system for generating high-energy rectangular pulse according to claim 1, which is characterized in that institute
Stating fiber amplifier (3) is erbium-doped fiber amplifier.
5. a kind of full optical fiber laser system for generating high-energy rectangular pulse according to claim 1, which is characterized in that institute
The length for stating the first general single mode fiber (4) is 75m, has negative dispersion at 1550nm.
6. a kind of full optical fiber laser system for generating high-energy rectangular pulse according to claim 1, which is characterized in that institute
The length for stating highly nonlinear optical fiber (5) is 100m, has nearly zero negative dispersion at 1550nm.
7. a kind of full optical fiber laser system for generating high-energy rectangular pulse according to claim 1, which is characterized in that institute
The filtering bandwidth range for stating programmable optical filter (6) meets: 1nm≤FBW≤70nm。
8. a kind of full optical fiber laser system for generating high-energy rectangular pulse according to claim 1, which is characterized in that institute
The length for stating the second general single mode fiber (7) is 10km, has negative dispersion at 1550nm.
9. a kind of method for generating high-energy rectangular pulse, which comprises the following steps:
S1, when passive mode-locking fiber laser (1) pump power be more than modelocking threshold after, laser interacvity gain, loss,
Realize that stable mode locking pulse output, output pulse are that typical dissipation is lonely under the collective effects such as dispersion and nonlinear effect
Son, pulse temporal shape are gaussian-shape, and corresponding spectral shape is approximately rectangle；
S2, the output pulse energy in order to further increase passive mode-locking fiber laser (1), the dissipative solitons arteries and veins output it
Punching, which is input in fiber amplifier (3), carries out power amplification；
S3, there is biggish positive chirp through fiber amplifier (3) amplified pulse, pulse width in picosecond magnitude, in order to
The femtosecond pulse for obtaining high-peak power, by the output pulse input of fiber amplifier (3) into the first general single mode fiber (4)
It is transmitted, under the effect of negative GVD effect, the pulse width of the first general single mode fiber (4) output pulse is compressed
To femtosecond magnitude, peak power can reach kW magnitude；
S4, by the first general single mode fiber (4) export high-peak power femtosecond pulse be input in highly nonlinear optical fiber (5) into
Transmission of going can cause such as certainly when transmission in highly nonlinear optical fiber (5) since incident pulse has very high peak power
The nonlinear effects such as phase-modulation, stimulated Raman scattering, four-wave mixing, simultaneously because optical fiber has nearly zero negative dispersion, pulse exists
Higher peak power can be always maintained in transmission process, thus continuously by the effect of nonlinear effect；Finally,
The spectral width of highly nonlinear optical fiber (5) output pulse broadens rapidly compared to incident pulse；
S5, step S4, also by the inevitable flatness reduced at the top of spectrum, are during broadening pulse spectrum
This, will carry out light spectrum reshaping in wide spectrum pulse input to the programmable optical filter (6) of highly nonlinear optical fiber (5) output,
So that the spectrum of programmable optical filter (6) output pulse becomes rectangle, while its spectral width can be put by adjusting optical fiber
The pump power of big device (3) and the filtering bandwidth of programmable optical filter (6) change；
S6, programmable optical filter (6) output optical pulse is input in the second general single mode fiber (7) and is transmitted,
Under the group velocity dispersion effect effect of optical fiber, gradually broadened when pulse is transmitted in a fiber, while optical fiber is applied to pulse one
A linear frequency chirp；When the dispersion measure of optical fiber accumulation is sufficiently large, the second general single mode fiber (7) exports the time domain shape of pulse
It is identical that shape will export the spectral shape of pulse with programmable optical filter (6)；Since programmable optical filter (6) export arteries and veins
The spectrum of punching is rectangle, thus under the effect of the strong dispersion effect of accumulation, the second general single mode fiber (7) exports the time domain of pulse
Shape also should be rectangle, and its pulse width for exporting pulse is by the spectral width of programmable optical filter (6) output pulse
It determines, to realize the adjustable high-energy rectangular laser pulse output of pulse width.
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| CN110137786A (en) * | 2019-05-31 | 2019-08-16 | 电子科技大学 | A kind of full optical fiber laser system and method generating orphan's burst mode |
| CN112271538A (en) * | 2020-10-12 | 2021-01-26 | 北京卓镭激光技术有限公司 | Laser and pulse width modulation method thereof |
| CN112886372A (en) * | 2021-01-13 | 2021-06-01 | 电子科技大学 | Multi-port output multi-wavelength laser pulse generation system |
| CN113206425A (en) * | 2021-04-12 | 2021-08-03 | 中国科学院上海光学精密机械研究所 | Dissipative soliton resonance fiber laser based on hybrid mode locking |
| CN114725759A (en) * | 2022-03-14 | 2022-07-08 | 电子科技大学 | Optical fiber laser system for generating high-energy soliton cluster pulses |
| WO2024016320A1 (en) * | 2022-07-22 | 2024-01-25 | 中国科学院物理研究所 | Composite birefringent crystal-based femtosecond laser pulse energy increasing apparatus, and use |
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| CN112886372A (en) * | 2021-01-13 | 2021-06-01 | 电子科技大学 | Multi-port output multi-wavelength laser pulse generation system |
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| WO2024016320A1 (en) * | 2022-07-22 | 2024-01-25 | 中国科学院物理研究所 | Composite birefringent crystal-based femtosecond laser pulse energy increasing apparatus, and use |
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