CN107302179B - A kind of sub- hundred femtosecond ultra-short pulse generation devices of compact-sized all -fiber - Google Patents
A kind of sub- hundred femtosecond ultra-short pulse generation devices of compact-sized all -fiber Download PDFInfo
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- CN107302179B CN107302179B CN201710302907.7A CN201710302907A CN107302179B CN 107302179 B CN107302179 B CN 107302179B CN 201710302907 A CN201710302907 A CN 201710302907A CN 107302179 B CN107302179 B CN 107302179B
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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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- 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
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
Abstract
The invention discloses a kind of sub- hundred femtosecond ultra-short pulse generation devices of compact-sized all -fiber, which includes by the sequentially connected dissipative solitons oscillator of single mode optical fiber, output isolated part, precompression section, amplification and non-linear compression part；Precompression section introduces negative dispersion, and the negative chirp value that precompression section provides is less than the positive chirp value of input pulse；Dissipative solitons oscillator generates the pulse with large energy and positive chirp, enter precompression section by exporting isolated part, pulse width is compressed, improve pulse peak power, finally pulse energy is improved in amplification and non-linear compression part, make pulse spectrum broadening, Pulse Compression using non-linear process, obtains sub- hundred femtosecond ultrashort pulses.The device has all optical fibre structure, has stronger resistance to the disturbance of external environment based on the dissipative solitons optical fiber laser of single-walled carbon nanotube mode locking, is capable of sub- hundred femtosecond pulses of output of long-time stable.
Description
Technical field
The present invention relates to Fiber laser technology fields, and in particular to a kind of ultrashort arteries and veins of sub- hundred femtoseconds of compact-sized all -fiber
Rush generation device.
Background technique
Ultrashort light pulse is in ultra-fast optical diagnosis, optical precision measurement, precision machinery processing, laser medicine and bioengineering
Equal fields are widely used, while being also the advanced subject of the research directions such as nonlinear optics, ultra-fast optical.Wherein, Asia hundred flies
Second ultrashort pulse has the characteristics that extremely narrow pulsewidth, the spectrum of ultra-wide, high peak power, be widely used in frequency comb,
The research fields such as molecule Transient Dynamics and nonlinear optics.Hundred ultrashort laser pulses source of Asia usually used at present
It is to be realized based on Ti:Sapphire laser solid state laser, has benefited from the gain bandwidth and lesser dispersion of its ultra-wide, facilitate hundred femtoseconds
The generation of pulse.However, solid state laser is bulky, involves great expense, there is strict demand to the temperature and humidity of working environment,
And be made of space optical path, system complex, mode-lock status is difficult in maintenance to extraneous environment sensitive.These problems limit ultrashort
It pulsed solid stale laser universal and promotes, makes which are mainly applied to laboratory environments.Optical fiber laser is with doped rare earth element light
Fibre is used as gain media, and compared with conventional solid laser, it is excellent to have that small in size, light-weight, compact-sized, reliability is high etc.
Point is the hot research problem in current ultra-short pulse laser technical field.
At present in optical fiber laser generate femtosecond pulse have comparative maturity scheme, have many producers released it is winged
The product of second optical fiber laser.Traditional orphan that they are usually generated using in negative dispersion optical fiber laser has as seed source
The pulse width of 500fs or more.The mode that sub- hundred femtosecond ultrashort pulses are generated in optical fiber laser is usually to pass through dispersion pipe
Reason controls the net dispersion of resonant cavity near zero dispersion, and laser is made to support the formation of stretched pulse.Stretched pulse have compared with
Wide spectral width can obtain pulsewidth in the ultrashort pulse below of hundred femtoseconds by dispersion element compression under proper condition.
But there are the following problems for this scheme: firstly, when the dispersion of laser resonator it is nearly zero when, high-order dispersion etc. in laser
Obvious effect can be generated to pulse evolution, while resonant cavity is more sensitive to the disturbance of external environment, be unfavorable for laser it is long when
Between stable work；Secondly, being limited by the nonlinear effect in fiber resonance cavity, the pulse energy of stretched pulse generally exists
1nJ is hereinafter, mean power is no more than 1mW, and this strongly limits the application ranges of laser, and in subsequent amplifying device,
Lesser power level can also have adverse effect on the signal-to-noise ratio of output pulse；There are also mode-locking technique is ultrashort to sub- hundred femtoseconds
The limitation of pulse optical fiber, the nonlinear polarization rotation technology and nonlinear optical loop mirror skill generallyd use in laboratory
Art is unable to satisfy laser self-starting and jamproof requirement, and semiconductor saturable absorbing mirror can be realized mode locked fiber laser
Self-starting, but have many restrictions on price, damage threshold and bandwidth of operation.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to which providing a kind of has all optical fibre structure, compact-sized, real
Convenient sub- hundred femtosecond ultra-short pulse generation devices are applied, a kind of ring can be provided for fields such as industrial processes, medical treatment, defense military
The stable sub- femtosecond ultrashort pulse source in border.
The purpose of the present invention is achieved through the following technical solutions: a kind of sub- hundred femtoseconds of compact-sized all -fiber are super
Short pulse generation device, including pass through the sequentially connected dissipative solitons oscillator of single mode optical fiber, output isolated part, pre-compression unit
Point, amplification and non-linear compression part；The precompression section introduces negative dispersion, and the negative chirp value that precompression section provides is less than
The positive chirp value of input pulse；The amplification and non-linear compression part are made of wavelength division multiplexer and gain fibre, while real
Now to the amplification of pulse and non-linear compression.
Further, the dissipative solitons oscillator includes wavelength division multiplexer, gain fibre (such as er-doped, ytterbium, thulium optical fiber
Deng), output coupler, the unrelated isolator of polarization and single-walled carbon nanotube mode-locking device, they are sequentially connected by single mode optical fiber
Ring cavity structure is formed, semiconductor laser is connect with wavelength division multiplexer, provides pump energy；Optical fiber is all made of between above-mentioned device
Welding connection；Net dispersion is positive in the resonant cavity of the scattered dissipative solitons oscillator, real using single-walled carbon nanotube mode-locking device
Existing mode locking.
Further, the output isolated part is realized by fibre optic isolater or three port circulators.
Further, the precompression section is made of the dispersion element that can provide negative dispersion, can be used fiber grating,
Dispersive optical fiber, photonic crystal fiber or micro-nano fiber.
Further, the amplification and non-linear compression part, wavelength division multiplexer and gain fibre constitute amplifier, use
The semiconductor laser connecting with wavelength division multiplexer is as pumping source；The nonlinear optical of different length can be connected after amplifier output
Fibre, for optimizing output result；Fused fiber splice connection is all made of between above-mentioned device.
Further, single mode optical fiber, photonic crystal fiber or micro-nano fiber can be used in the nonlinear optical fiber.
Further, wavelength division multiplexer and gain fibre used in amplification and non-linear compression part should be with dissipative solitons
Oscillator is corresponding.
Further, gain fibre and nonlinear optical fiber length, output coupler splitting ratio, dispersion element dispersion size etc.
It (related with seed source pulse characteristic, pump power, output power etc.) can be adjusted according to the actual situation.
A method of sub- hundred femtosecond ultrashort pulses being generated, this method comprises: generating first by dissipative solitons oscillator
Pulse with large energy and positive chirp；Secondly, preventing the light of reverse transfer to dissipation by output isolated part pulse
Orphan's oscillator has an impact；Then, make pulse by precompression section, pulse width is compressed, improve pulse peak power；
Finally, improving pulse energy by amplification and non-linear compression part, make pulse spectrum broadening, pulsewidth using non-linear process
Compression obtains sub- hundred femtosecond ultrashort pulses.
The beneficial effects of the present invention are:
1, device used in the sub- hundred femtosecond ultra-short pulse generation devices of all -fiber is construction optical fiber laser or amplifier institute
General-purpose device can be commercialized, low in cost.
2, material of the dissipative solitons oscillator using carbon nanotube as production mode-locking device, low with production cost,
The advantages that production method is simple, saturation threshold is low and mode locking is stable can be sub- hundred femtosecond ultra-short pulse generations dress
It sets and the seed source of ambient stable is provided, improve the stability of device entirety.
3, the sub- hundred femtosecond ultra-short pulse generation devices of all -fiber are using high energy dissipation orphan as seed source, using putting
Big and non-linear compression realizes spectrum widening and pulse compression, has height compared to hundred femtosecond pulse of Asia obtained using stretched pulse
Pulse energy and peak power much, can there is wider application prospect.
4, the sub- hundred femtosecond ultra-short pulse generation devices of all -fiber have all optical fibre structure, therefore have more compact knot
Structure is conducive to generation device and realizes miniaturization.
5, the technical solution of the sub- hundred femtosecond ultra-short pulse generation devices of all -fiber is all suitable for each wave band, uses
Component is all readily available, therefore facilitates the realization in sub- hundred femtosecond pulses of multiple wave bands.
Detailed description of the invention
Fig. 1 is overall structure diagram of the invention；
Fig. 2 is dissipative solitons oscillator embodiment schematic diagram in the present invention；
Fig. 3 is embodiment of the present invention schematic diagram；
In Fig. 4, (a) is the spectrogram that dissipative solitons oscillator exports pulse, (b) is autocorrelator trace；
In Fig. 5, it (b) is autocorrelator trace that (a), which is the spectrogram for exporting sub- hundred femtosecond pulses,；
In figure, 101-dissipative solitons oscillators；102-output isolated parts；103-precompression sections；104-amplifications
With non-linear compression part；201-the first wavelength division multiplexer；202-the first gain fibre；203-output couplers；204—
Polarize unrelated isolator；205-single-walled carbon nanotube mode-locking devices；206-the first pump light source；301-three port circulators；
302-single mode optical fibers；303-Er-doped fibers；304-the second wavelength division multiplexer；305-the second pump light source.
Specific embodiment
Invention is further described in detail in the following with reference to the drawings and specific embodiments.
As shown in Figure 1, the sub- hundred femtosecond ultra-short pulse generation devices of all -fiber that one kind provided by the invention is compact-sized, packet
It includes through the sequentially connected dissipative solitons oscillator 101 of single mode optical fiber, output isolated part 102, precompression section 103 and amplification
With non-linear compression part 104；The precompression section 103 introduces negative dispersion, and the negative chirp value that precompression section 103 provides is small
In the positive chirp value of input pulse.
As shown in Fig. 2, dissipative solitons oscillator 101 include wave the first wavelength division multiplexer 201, it is the first gain fibre 202, defeated
Coupler 203, the unrelated isolator 204 of polarization, single-walled carbon nanotube mode-locking device 205 and the first pump light source 206 out, they are logical
Single mode optical fiber is crossed to connect to form ring cavity structure；The single mode semiconductor that first pump light source, 206 selection work wavelength is 976nm swashs
Light device is that the first gain fibre 202 provides pumping by the first wavelength division multiplexer of 980nm/1550nm 201；First gain fibre
202 use the Er-doped fiber of model Nufern EDFC-980-FC, and abbe number is -16ps/nm/km, length at 1550nm
For 12m；It is 40% that the output of output coupler 203, which is compared,；Single-walled carbon nanotube mode-locking device 205 is based on single control
Standby saturable absorber；Device tail optical fiber and other intracavitary single-mode optical fiber lengths are about 5.5m, and abbe number D is about at 1550nm
For 17ps/nm/km.Light moves in circles in dissipative solitons oscillator 101, passes sequentially through the increasing of the first wavelength division multiplexer 201, first
Beneficial optical fiber 202, output coupler 203, the unrelated isolator 204 of polarization, single-walled carbon nanotube mode-locking device 205, are centainly pumping
Under power, 101 self-starting modelocking of dissipative solitons oscillator, the dissipative solitons pulse of formation is entered defeated by output coupler 203
Isolated part 102 out, so that the light transmitted backward cannot be introduced into dissipative solitons oscillator 101.
As shown in figure 3, output isolated part 102 is realized by a three port circulators 301, by three port rings
The shape port device a is connect as input port with 40% output end of output coupler 203, using the port b as output port, with
Precompression section 103 is connected, and the light of reverse transfer can be output to other than optical path by the port c, realizes isolation to the greatest extent.In advance
Compression section 103 selects common single mode optical fiber 302 to provide negative dispersion as dispersion element, and 302 length of single mode optical fiber is 65m.
Amplification and non-linear compression part 104 include sequentially connected Er-doped fiber 303, the second wavelength division multiplexer 304 and the second pumping
Light source 305；Second pump light source, 305 selection work wavelength is the single mode semiconductor laser of 976nm, passes through 980nm/1550nm
Second wavelength division multiplexer 304 is that Er-doped fiber 303 provides pumping；The model Nufern EDFC-980-FC of Er-doped fiber 303,
Length is 4.5m；The tail optical fiber of second wavelength division multiplexer 304 is realized into final pulse compression, tail optical fiber length as nonlinear optical fiber
For 1.6m.Pulse after precommpression enters amplification and non-linear compression part 104, and light pulse passes through Er-doped fiber 303, arteries and veins first
Energy is rushed to be amplified；Due to stronger nonlinear optical effect, spectral width increases, and pulse width is further narrow as, peak work
Rate improves；Finally pass through one section of nonlinear optical fiber, pulse is compressed to most narrow.
Working principle of the invention is as follows:
It uses dissipative solitons oscillator as seed source in the present invention, dispersion in oscillator is adjusted by dispersion management technique
The length of optical fiber, makes the net positive dispersion of net dispersion value of oscillator, dissipative solitons be positive dispersion, third-order non-linear, filter effect,
The result of gain and the comprehensive function of loss etc..Dissipative solitons oscillator is realized using the mode-locking device based on single-walled carbon nanotube
Mode locking, single-walled carbon nanotube have the recovery time of lesser saturation threshold power and picosecond magnitude, can be realized mode locking oneself
Starting.The pulse of dissipative solitons oscillator output has biggish positive chirp, can be by the positive chirp of negative dispersion compensation by pulse
Width compression.Pulse width is compressed to several picoseconds from tens picoseconds using the dispersion element with negative dispersion in the present invention,
Improve peak power, nonlinear effect of the intensifier pulse in amplification and non-linear compression fractional transmission.Amplification and it is non-linear
Compression section, pulse are further amplified in gain fibre, simultaneously because its higher peak power, pulse spectrum are non-thread
Property broadening, pulse width is further compressed.Have benefited from the broadening of spectral width, it is wide that the pulse more narrower than seed source can be obtained
Degree.The pulse of sub- hundred femtoseconds is obtained by the length of the size of adjusting pump power, gain fibre and nonlinear optical fiber.
Experimental result of the invention is as follows:
As pump power about 30mW, self-starting modelocking is may be implemented in dissipative solitons oscillator, and pump power is risen to about
When 90mW, prominent pulse output is obtained in dissipative solitons oscillator, average output power is about 6mW.This clock pulse
The spectrum and autocorrelator trace of punching reflect its dissipative solitons characteristic as shown in figure 4, spectrum has approximate rectangular envelope,
Its full width at half maximum is 11.8nm, central wavelength 1565nm.Pulse width is about 18ps, time-bandwidth product 26, it may be said that bright
Pulse at this time has very big positive chirp.If assuming, it is Gaussian-shaped pulse, the corresponding transform limit of dissipative solitons pulse
Pulse width is about 0.3ps.After dissipative solitons pulse is passed through isolator, precompression section, amplification and non-linear compression part,
Available sub- hundred femtoseconds ultrashort pulse.As the pump power about 150mW of amplification and non-linear compression part, obtained pulse
As shown in figure 5, average output power is about 26mW.Fig. 5 (a) is the spectrogram for exporting pulse, compares the spectrum in Fig. 4 (a),
Spectral shape has lost the feature of rectangle, and spectral width is largely broadened.Fig. 5 (b) be export pulse from phase
Curve is closed, pulse width is about 95fs.
In conclusion the present invention provides a kind of sub- hundred femtosecond ultra-short pulse generation devices of compact-sized all -fiber,
With all optical fibre structure, the dissipative solitons optical fiber laser based on single-walled carbon nanotube mode locking has the disturbance of external environment
Stronger resistance is capable of sub- hundred femtosecond pulses of output of long-time stable.The pulse obtained in the device arteries and veins with higher
Energy and peak power are rushed, there is important application prospect in fields such as nonlinear optics, ultra-fast optical detection, frequency combs.
Claims (7)
1. a kind of sub- hundred femtosecond ultra-short pulse generation devices of compact-sized all -fiber, it is characterised in that: including passing through single-mode optics
Fine sequentially connected dissipative solitons oscillator, output isolated part, precompression section, amplification and non-linear compression part；It is described
Precompression section introduces negative dispersion, and the negative chirp value that precompression section provides is less than the positive chirp value of input pulse；The amplification
It is made of with non-linear compression part wavelength division multiplexer and gain fibre, while realizing the amplification to pulse and non-linear compression；
The amplification and non-linear compression part, wavelength division multiplexer and gain fibre constitute amplifier, connect using with wavelength division multiplexer
Semiconductor laser as pumping source；One section of nonlinear optical fiber is connected after amplifier output, the non-linear Zhou generated using it
It sings and chirp remaining in dispersion compensation pulse, obtains the ultrashort pulse of sub- hundred femtoseconds；Optical fiber welding is all made of between each device in succession
It connects.
2. the sub- hundred femtosecond ultra-short pulse generation devices of compact-sized all -fiber according to claim 1, it is characterised in that:
The dissipative solitons oscillator includes that wavelength division multiplexer, gain fibre, output coupler, the unrelated isolator of polarization and single wall carbon are received
Mitron mode-locking device, they are in turn connected to form ring cavity structure, semiconductor laser and wavelength division multiplexer by single mode optical fiber
Connection, provides pump energy；Fused fiber splice connection is all made of between above-mentioned device；It is net in the resonant cavity of the dissipative solitons oscillator
Dispersion is positive, and realizes mode locking using single-walled carbon nanotube mode-locking device.
3. the sub- hundred femtosecond ultra-short pulse generation devices of compact-sized all -fiber according to claim 1, it is characterised in that:
The output isolated part is realized by fibre optic isolater or three port circulators.
4. the sub- hundred femtosecond ultra-short pulse generation devices of compact-sized all -fiber according to claim 1, it is characterised in that:
The precompression section is made of the dispersion element of offer negative dispersion, using fiber grating, dispersive optical fiber, photonic crystal fiber or
Micro-nano fiber.
5. the sub- hundred femtosecond ultra-short pulse generation devices of compact-sized all -fiber according to claim 4, it is characterised in that:
The nonlinear optical fiber uses single mode optical fiber, photonic crystal fiber or micro-nano fiber.
6. the sub- hundred femtosecond ultra-short pulse generation devices of compact-sized all -fiber according to claim 1-5,
Be characterized in that: wavelength division multiplexer used in amplification and non-linear compression part and gain fibre should be with dissipative solitons oscillator phases
It is corresponding.
7. a kind of method for generating sub- hundred femtosecond ultrashort pulses using claim 1 described device, it is characterised in that: pass through first
Dissipative solitons oscillator generates the pulse with positive chirp；Secondly, pulse is prevented reverse transfer by output isolated part
Light has an impact dissipative solitons oscillator；Then, make pulse by precompression section, pulse width is compressed, improve pulse
Peak power；Finally, improving pulse energy by amplification and non-linear compression part, utilizing the non-linear mistake in gain fibre
Journey makes pulse spectrum broadening, Pulse Compression, and it is ultrashort finally to obtain sub- hundred femtoseconds using one section of remaining chirp of nonlinear optical fiber compensation
Pulse.
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| CN108666858A (en) * | 2018-04-24 | 2018-10-16 | 上海理工大学 | A kind of multi-wavelength femtosecond Raman fiber lasers |
| CN109494552A (en) * | 2018-11-20 | 2019-03-19 | 电子科技大学 | A kind of full optical fiber laser system and method generating high-energy rectangular pulse |
| CN111509549B (en) * | 2020-04-10 | 2021-07-06 | 中国科学院上海光学精密机械研究所 | High-peak power femtosecond laser negative/positive chirp pulse cascade amplification system |
| RU2764384C1 (en) * | 2020-12-03 | 2022-01-17 | Илья Олегович Орехов | Method for controlling the amount of coupled solitons in a femtosecond fibre laser |
| CN114725759B (en) * | 2022-03-14 | 2023-04-07 | 电子科技大学 | Optical fiber laser system for generating high-energy soliton cluster pulses |
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| US8787411B2 (en) * | 2011-06-21 | 2014-07-22 | Cornell University | Mode-locked fiber laser based on narrowband optical spectral filtering and amplifier similaritons |
| CN103633546B (en) * | 2013-12-16 | 2016-08-17 | 北京工业大学 | Dual-wavelength dissipative soliton mode-locked laser |
| US9899791B2 (en) * | 2015-05-14 | 2018-02-20 | KM Labs Inc. | Single pass amplification of dissipative soliton-like seed pulses |
| CN106129786A (en) * | 2016-07-18 | 2016-11-16 | 电子科技大学 | Tunable dual wavelength mode locked fiber laser based on tapered fiber |
| CN106099631A (en) * | 2016-07-26 | 2016-11-09 | 江苏师范大学 | A kind of all-fiber dissipative solitons resonance mode-locked laser |
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