CN108767637A - THz high repetition frequency high power femto second optical fiber lasers based on dispersive wave - Google Patents
THz high repetition frequency high power femto second optical fiber lasers based on dispersive wave Download PDFInfo
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 85
- 239000000835 fiber Substances 0.000 claims abstract description 115
- 230000003321 amplification Effects 0.000 claims abstract description 37
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 37
- 229910052691 Erbium Inorganic materials 0.000 claims abstract description 24
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 claims abstract description 24
- 230000006835 compression Effects 0.000 claims abstract description 17
- 238000007906 compression Methods 0.000 claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 229910052769 Ytterbium Inorganic materials 0.000 claims description 25
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 claims description 25
- 238000005253 cladding Methods 0.000 claims description 11
- 238000005086 pumping Methods 0.000 claims description 8
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—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
- H01S3/06716—Fibre compositions or doping with active elements
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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
-
- 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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
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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
- H01S3/10084—Frequency control by seeding
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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
- H01S3/106—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
- H01S3/109—Frequency multiplication, e.g. harmonic generation
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Abstract
The invention discloses a kind of THz high repetition frequency high power femto second optical fiber lasers based on dispersive wave, including erbium doped fiber laser seed source, frequency upgrading part, amplifier section and Pulse Compression part；The output end of the erbium doped fiber laser seed source is connect by highly nonlinear optical fiber with the frequency upgrading part, the output end of the frequency upgrading part is connected to the amplifier section, the amplifier section includes pre-amplification part and the main amplifier section of two-stage, and the output end of the amplifier section is connected with the Pulse Compression part；Nonlinear frequency conversion of the laser signal through the highly nonlinear optical fiber that the erbium doped fiber laser seed source generates, and pass through the frequency upgrading part by its frequency upgrading to THz high repetition frequencies, the laser signal of the THz high repetition frequencies carries out power amplification through the pre-amplification part of the amplifier section and the main amplifier section of two-stage, using the Pulse Compression part, the high power femtosecond pulse signal of THz high repetition frequencies is exported.Mounting structure of the present invention is simple, it is easy to accomplish, it is of low cost, convenient for promoting.
Description
Technical field
The present invention relates to laser technology fields, and in particular to a kind of THz high repetition frequency high powers based on dispersive wave are winged
Second optical fiber laser.
Background technology
High power femto second optical fiber laser have beam quality is high, thermal stability is good, peak power is high, it is compact-sized, at
The advantages that this is low, environmental stability is good, Maintenance free, in Precision Machining, waveguide etching, supercontinuum generation and laser sensing etc.
It is gradually paid close attention to by researcher using more and more extensive in field.Currently, the Er-doped fiber of 1550nm wave bands is due to having just
It is humorous can preferably to control optical fiber laser by selecting the optical fiber of different length, different dispersions for the optical fiber of dispersion and negative dispersion
The dispersion values for intracavitary of shaking realize the output of femtosecond laser signal.And for 1064nm wave bands, optical fiber is all in the dispersion values of this wave band
Positive value, carries out the chirped fiber Bragg gratings of dispersion compensation, photonic crystal fiber is required for customizing to it, expensive, because
And the ytterbium-doping optical fiber laser of 1064nm wave bands obtains femto-second laser pulse output with higher difficulty.It is high-power to obtain one
As be to use MOPA structures, the femto second optical fiber laser of lower-wattage pulse laser that mode locking obtains output is amplified by MOPA,
It can be achieved to export compared with high pulse energy and the laser signal of mean power.
It is by higher hamonic wave mode locking and shortening that the main method of high repetition frequency is obtained in passive mode-locking fiber laser
The length of resonant cavity of fibre-optical laser.Higher hamonic wave mode locking needs significantly promote pump laser on the basis of fundamental frequency mode locking
Pump power, since it is not fundamental frequency working condition, uniformity and the stability for exporting laser signal are all poor；And it pumps
The promotion of power will increase the pulse energy of entire laser resonator intracavitary, can influence the service life of passive mode-locking element in this way
And generate multiple-pulse phenomenon.Length for shortening resonant cavity can effectively promote the repetition rate of mode locking pulse, but chamber is shorter
The pattern for participating in mode locking is fewer, and mode locking difficulty also can accordingly increase.In addition, being all difficult to reach for harmonic mode locking and short cavity mode locking
To extra high repetition rate, this is limited by the mechanism of itself, and the repetition rate of THz is extremely difficult to using this two methods.
And need mode locked fiber laser that there is higher repetition rate, the high of optical fiber laser to repeat in the application of optical frequency com
Frequency can increase broach interval, and the requirement of frequency measurement application is met with this；The high-precision radial velocity is fixed in astronomical observation
The scientific researches such as mark problem, accurate distance measurement, precision lidar, national defence, which are also required to optical fiber laser, has high repeat frequently
Rate.
Invention content
In view of this, it is necessary to provide a kind of stable light beam quality, the high THz high repetitions based on dispersive wave of output power
Frequency high power femto second optical fiber laser.
A kind of THz high repetition frequency high power femto second optical fiber lasers based on dispersive wave, including erbium doped fiber laser
Seed source, frequency upgrading part, amplifier section and Pulse Compression part；The output end of the erbium doped fiber laser seed source is logical
It crosses highly nonlinear optical fiber to connect with the frequency upgrading part, the output end of the frequency upgrading part is connected to the enlarging section
Point, the amplifier section includes pre-amplification part and the main amplifier section of two-stage, the output end of the amplifier section and the pulsewidth
Compression section is connected；The laser signal that the erbium doped fiber laser seed source generates is through the non-linear of the highly nonlinear optical fiber
Frequency conversion, and pass through the frequency upgrading part by its frequency upgrading to THz high repetition frequencies, the THz high repetition frequencies
Laser signal carry out power amplification through the pre-amplification part of the amplifier section and the main amplifier section of two-stage, using the arteries and veins
Wide compression section exports the high power femtosecond pulse signal of THz high repetition frequencies.
Further, the erbium doped fiber laser seed source includes laser seed source and Erbium-doped fiber amplifier part,
The laser seed source includes sequentially connected light reflection mirror, the first er-doped gain fibre, the first wavelength division multiplexer and first
Optoisolator；Two input terminals of first wavelength division multiplexer are connected separately with the first er-doped gain fibre and the first list
The output end of mould pump laser and its driving circuit, two output ends of first wavelength division multiplexer are respectively connected to described
The input terminal of first optoisolator and a saturable absorber SESAM module.
Further, first wavelength division multiplexer include sequentially connected first optical fiber collimator, optically filtering piece, partially
Shake piece, Wollaston prism and the second optical fiber collimator；The input terminal of first optical fiber collimator passes through first er-doped
Gain fibre is connected to the light reflection mirror.
Further, the Erbium-doped fiber amplifier part include the second wavelength division multiplexer, the second mode pump laser device and
The input terminal of its driving circuit and the second er-doped gain fibre, second wavelength division multiplexer is connected to first optoisolator
Output end and the second mode pump laser device and its driving circuit output end, the output end of second wavelength division multiplexer connects
It is connected to the second er-doped gain fibre, the Erbium-doped fiber amplifier part is for promoting the defeated of the erbium doped fiber laser seed source
Go out power.
Further, the input terminal of the highly nonlinear optical fiber is connected to the second er-doped gain fibre, the Gao Fei
The output end of linear optical fiber is connected to the frequency upgrading part, the highly nonlinear optical fiber be used for the laser signal of input into
Row nonlinear frequency transformation.
Further, the frequency upgrading part includes cascade 50/50 fiber coupler, cascade 50/50 light
Fine coupler includes the sequentially connected one 1 × 2nd 50/50 fiber coupler, multiple 2 × 2 50/50 fiber coupler and
21 × 2 50/50 fiber coupler, the described one 1 × 2nd 50/50 fiber coupler and the multiple 2 × 2 50/50 light
It is connected using optical fiber between fine coupler, the multiple 2 × 2 50/50 fiber coupler and the described 21 × 2nd 50/50 light
It is connected using optical delay line between fine coupler；The frequency upgrading part is inputted using frequency multiplication step by step for fast lifting
The repetition rate of laser signal.
Further, the pre-amplification part includes first order pre-amplification part and second level pre-amplification part, and described
Level-one pre-amplification part includes third wavelength division multiplexer, third mode pump laser device and its driving circuit, first mixes ytterbium gain
Optical fiber and the second optoisolator, the input terminal of the third wavelength division multiplexer be connected to the frequency upgrading part output end and
Third mode pump laser device and its driving circuit, the third wavelength division multiplexer output end are mixed ytterbium gain fibre by first and are connected
It is connected to the second optoisolator；Second level pre-amplification part include the 4th wavelength division multiplexer, the 4th mode pump laser device and
Its driving circuit, second mix ytterbium gain fibre and third optoisolator, and the input terminal of the 4th wavelength division multiplexer is connected to institute
State the first pre-amplification part output end and the 4th mode pump laser device and its driving circuit, the 4th wavelength division multiplexer it is defeated
Outlet mixes ytterbium gain fibre by second and is connected to third optoisolator.
Further, the main amplifier section includes the main amplifier section in the main amplifier section of the first order and the second level, and described
The main amplifier section of level-one includes (2+1) × 1 combiner device, a pair of of multimode pump laser and its driving circuit, the first double clad
Yb dosed optical fiber and the first high power light isolator, the input terminal of (2+1) × 1 combiner device are connected to the second level and put in advance
Most output end and a pair of of multimode pump laser and its driving circuit, the output end of (2+1) × 1 combiner device are logical
It crosses the first Double Cladding Ytterbium Doped Fiber and is connected to the first high power light isolator；The main amplifier section in the second level includes (6+1) × 1
It is combiner device, two groups of multimode pump lasers and its driving circuit, the second Double Cladding Ytterbium Doped Fiber, pumping leakage device, second high
The input terminal of power optoisolator and end cap, (6+1) × 1 combiner device is connected to the defeated of the main amplifier section of the first order
Outlet and two groups of multimode pump lasers and its driving circuit, the output end of (6+1) × 1 combiner device pass through the second double-contracting
Layer Yb dosed optical fiber is sequentially connected to leakage of pumping device, the second high power light isolator and end cap.
Further, the leakage of pumping device is for filtering out residual pump light；The end cap be used for output signal light into
Row expands, and causes to damage to avoid to fiber end face；The first high power light isolator and second high power light isolation
Device is used for the one-way transmission of laser signal.
Further, the Pulse Compression part includes collimating mirror, diffraction grating to, speculum and outgoing mirror, described to spread out
Grating is penetrated to being compressed for the high power femtosecond pulse signal to output, realizes the laser pulse signal of more burst pulse
Output；After laser signal is by the collimating mirror, compressed by the diffraction grating pair and the speculum, then through described defeated
Appearance exports.
In the above-mentioned THz high repetition frequency high power femto second optical fiber lasers based on dispersive wave, using Erbium doped fiber laser
Device seed source generates the femtosecond pulse signal of higher repetitive frequency, by the non-of one section of highly nonlinear optical fiber after this signal is amplified
Linear frequency is converted, then the multiple stage frequency lift portion being made up of coupler, obtains the femtosecond pulse letter of THz high repetition frequencies
Number, then by the MOPA structures of Yb dosed optical fiber pre-amplification and the main amplification of two-stage yb-doped double-clad fiber, by the Gao Chong of low-power
Complex frequency femtosecond pulse signal is amplified to tens watts of laser signal output, and to it into Pulse Compression outside an actor's rendering of an operatic tune, to obtain
The high-power laser signal of THz high repetition frequencies exports.The mounting structure of this method is simple, it is easy to accomplish, it is of low cost, just
In popularization.
Description of the drawings
Fig. 1 is the structure of THz high repetition frequency high power femto second optical fiber laser of the embodiment of the present invention based on dispersive wave
Schematic diagram.
Specific implementation mode
The present embodiment, below will knot by taking the THz high repetition frequency high power femto second optical fiber lasers based on dispersive wave as an example
Closing specific embodiments and the drawings, the present invention is described in detail.
Referring to Fig. 1, showing that a kind of THz high repetition frequency high powers based on dispersive wave provided in an embodiment of the present invention fly
Second optical fiber laser 100, including erbium doped fiber laser seed source 13, frequency upgrading part 27, amplifier section and Pulse Compression
Part 56；The output end of the erbium doped fiber laser seed source 13 passes through highly nonlinear optical fiber 19 and the frequency upgrading part
27 connections, the output end of the frequency upgrading part 27 are connected to the amplifier section, and the amplifier section includes pre-amplification portion
Points 37 and the main amplifier section 50 of two-stage, the output end of the amplifier section be connected with the Pulse Compression part 56；The er-doped
Nonlinear frequency conversion of the laser signal through the highly nonlinear optical fiber 19 that optical fiber laser seed source 13 generates, and pass through institute
Frequency upgrading part 27 is stated by its frequency upgrading to THz high repetition frequencies, described in the laser signal warp of the THz high repetition frequencies
The pre-amplification part 37 of amplifier section and the main amplifier section 50 of two-stage carry out power amplification, using the Pulse Compression part
56, export the output of the high power femtosecond pulse signal of THz high repetition frequencies.
Further, the erbium doped fiber laser seed source 13 includes laser seed source and Erbium-doped fiber amplifier part
18, the laser seed source includes sequentially connected light reflection mirror 1, the first er-doped gain fibre 2, the first wavelength division multiplexer 10
With the first optoisolator 7；Two input terminals of first wavelength division multiplexer 10 are connected separately with the first er-doped gain light
The output end of fibre 2 and the first mode pump laser device 9 and its driving circuit, two output ends of first wavelength division multiplexer 10
It is respectively connected to the input terminal of first optoisolator 7 and a saturable absorber SESAM module 11.First wavelength-division
Multiplexer 10 includes sequentially connected first optical fiber collimator 3, optically filtering piece 4, polarizing film 5, Wollaston prism 12 and the
Two optical fiber collimators 6；The input terminal of first optical fiber collimator 3 is connected to described by the first er-doped gain fibre 2
Light reflection mirror 1.The Erbium-doped fiber amplifier part 18 is used to be promoted the output power of the erbium doped fiber laser seed source 13,
The Erbium-doped fiber amplifier part 18 include the second wavelength division multiplexer 16, the second mode pump laser device 15 and its driving circuit and
Second er-doped gain fibre 17, the input terminal of second wavelength division multiplexer 16 are connected to the output of first optoisolator 7
The output end at end and the second mode pump laser device 15 and its driving circuit, the input terminal connection of second wavelength division multiplexer 16
To the second er-doped gain fibre 17.
Specifically, in the present embodiment, first wavelength division multiplexer 10 and second wavelength division multiplexer 16 use four
980/1550 wavelength division multiplexer of port.The reflection input terminal of one end of the light reflection mirror 1 and first wavelength division multiplexer 10
One section of high concentration erbium doped fiber is shared, signal output end and the collimator of first wavelength division multiplexer 10 pass through one section of short-tail fibre
Connection, the chamber that can efficiently reduce resonant cavity are long.
Specifically, the output percentage of first wavelength division multiplexer 10 can adjust output power, but it exports percentage
Than need to coordinate with the length of the first er-doped gain fibre 2 and tail optical fiber in resonant cavity, to choose intra-cavity dispersion appropriate；The light
Integration packaging filter plate in speculum 1, the filter plate are used to control the centre wavelength and spectral bandwidth of output signal, with drop
Low entire seed source system noise.First optical fiber collimator 3, the light reflection mirror 1 have carried out optical fiberization encapsulation, and described the
Two optical fiber collimators 6 use modularized encapsulation with saturable absorber SESAM modules 11, to ensure the stability and structure of system
Compactedness.
Preferably, the erbium doped fiber laser seed source 13 carries out mode locking using saturable absorber SESAM modules 11,
It selects the parameters such as saturation flux, modulation depth and relaxation time appropriate to be matched with laser resonant cavity intrinsic parameter and realizes femtosecond arteries and veins
Punching output；To prevent 11 thermal damage of saturable absorber SESAM modules, SESAM can be pasted onto to the heat dissipation material such as copper product or aluminium
Expect on pedestal, and is encapsulated by glass tube.
In order to ensure not interfered by external environment in system operation, in the erbium doped fiber laser seed source 13
Each component is all made of polarization-maintaining device, and the femtosecond erbium doped fiber laser seed source 13 is made to have self-starting and Low threshold
Energy.
Further, the input terminal of the highly nonlinear optical fiber 19 is connected to the second er-doped gain fibre 17, described
The output end of highly nonlinear optical fiber 19 is connected to the frequency upgrading part 27, and the highly nonlinear optical fiber 19 is used for input
Laser signal carries out nonlinear frequency transformation.
Specifically, using the performance of the nonlinear frequency conversion of the highly nonlinear optical fiber 19 by spectrum from 1550 nanometer waves
For Duan Tuokuan to 1064 nano wavebands, 19 length of the highly nonlinear optical fiber is shorter, by the light of itself and the frequency upgrading part 27
The tail optical fiber of fine coupler connects, and since subsequent device and tail optical fiber are all 1064nm wave bands, can filter out to obtain required
The laser signal of 1064nm wave bands.
Further, the frequency upgrading part 27 include cascade 50/50 fiber coupler, described cascade 50/50
Fiber coupler includes the sequentially connected one 1 × 2nd 50/50 fiber coupler 20, multiple 2 × 2 50/50 fiber coupler
22 and the 21 × 2nd 50/50 fiber coupler 26, the described one 1 × 2nd 50/50 fiber coupler 20 and the multiple 2 × 2
50/50 fiber coupler 22 between connected using optical fiber 21, the multiple 2 × 2 50/50 fiber coupler 22 and described the
It is connected using optical delay line 25 between 21 × 2 50/50 fiber coupler 26；The frequency upgrading part 27 is using step by step
Frequency multiplication, the repetition rate for fast lifting input laser signal.
Specifically, the tail optical fiber of the fiber coupler uses 1060 optical fiber of HI, the lower fiber coupler of repetition rate two
The arm length difference of port is obtained by controlling the tail optical fiber length of two-port, and need to be with the repetition frequency for the femtosecond pulse signal for entering this grade
Rate matches.
Preferably, when entering repetition rate higher what last fiber coupler two-port arm length difference already below milli
Meter level is difficult control by tail optical fiber length difference, and optical delay line 25 can be used at this time and provide delay to pulse signal, obtain THz
The femtosecond pulse of the 1064nm wave bands of high repetition frequency.
Further, the pre-amplification part 37 includes first order pre-amplification part and second level pre-amplification part, described
First order pre-amplification part includes third wavelength division multiplexer 29, third mode pump laser device 57 and its driving circuit, first mixes
The input terminal of ytterbium gain fibre 30 and the second optoisolator 31, the third wavelength division multiplexer 29 is connected to the frequency upgrading portion
Points 27 output end and third mode pump laser device 57 and its driving circuit, 29 output end of third wavelength division multiplexer passes through
First, which mixes ytterbium gain fibre 30, is connected to the second optoisolator 31；Second level pre-amplification part includes the 4th wavelength division multiplexer
33, the 4th mode pump laser device 32 and its driving circuit, second mix ytterbium gain fibre 35 and third optoisolator 36, and described
The input terminal of four wavelength division multiplexers 33 is connected to the output end and the 4th mode pump laser device of first pre-amplification part 37
32 and its driving circuit, 33 output end of the 4th wavelength division multiplexer by second mix ytterbium gain fibre 35 be connected to third light every
From device 36.
Further, the main amplifier section 50 includes the main amplifier section in the main amplifier section of the first order and the second level, described
The main amplifier section of the first order includes (2+1) × 1 combiner device 40, a pair of of multimode pump laser 38,39 and its driving circuit, the
The input terminal of one Double Cladding Ytterbium Doped Fiber 41 and the first high power light isolator 42, (2+1) × 1 combiner device 40 is connected to
The output end of second level pre-amplification part and a pair of of multimode pump laser 38,39 and its driving circuit, (2+1) ×
The output end of 1 combiner device 40 is connected to the first high power light isolator 42 by the first Double Cladding Ytterbium Doped Fiber 41；Described
The main amplifier section of two level includes 45, two groups of multimode pump lasers 43,44 of (6+1) × 1 combiner device and its driving circuit, second
Double Cladding Ytterbium Doped Fiber 46, pumping leakage device 47, the second high power light isolator 48 and end cap 49, (6+1) × 1 combiner
The input terminal of device 4545 be connected to the main amplifier section of the first order output end and two groups of multimode pump lasers 43,44 and its
The output end of driving circuit, (6+1) × 1 combiner device 45 is sequentially connected to pump by the second Double Cladding Ytterbium Doped Fiber 46
Leak artifact, the second high power light isolator 48 and end cap 49.The leakage of pumping device is for filtering out residual pump light；The end cap
49, for expanding output signal light, cause to damage to avoid to fiber end face；The first high power light isolator 42
The one-way transmission of laser signal is used for the second high power light isolator 48.
Specifically, described (2+1) × 1 optical-fiber bundling device and (6+1) × 1 combiner device 45 are by multimode pump laser
Coupling pump light enter in first Double Cladding Ytterbium Doped Fiber 41 and second Double Cladding Ytterbium Doped Fiber 46, make to mix ytterbium from
Sub- transition, to amplified signal light.The first high power light isolator 42 and the second original text power optoisolator can be effective
Backward spontaneous radiation amplification is controlled, improves quality of output signals, while also functioning to certain protective effect to device.
Further, the Pulse Compression part 56 includes collimating mirror 51, diffraction grating pair 53,54, speculum 55 and defeated
Appearance 52, the diffraction grating pair 53,54 are realized narrower for being compressed to the high power femtosecond pulse signal of output
The laser pulse signal of pulse exports；After laser signal is by the collimating mirror 51, by the diffraction grating pair 53,54 and described
Speculum 55 is compressed, then is exported through the outgoing mirror 52.
The present invention has the following advantages：One, the one end and first wavelength-division multiplex of the present invention by the light reflection mirror 1
The reflection input terminal of device 10 is directly connected by the first er-doped gain fibre 2, the signal of first wavelength division multiplexer 10
Output end is connected with the first collimator by one section of short-tail fibre, and 13 resonance of erbium doped fiber laser seed source is effectively reduced
The chamber of chamber is long.Two, the present invention generates the femtosecond pulse seed source of 1550nm wave bands using erbium doped fiber laser mode locking, avoids adopting
It uses Yb dosed optical fiber as the complexity of dispersion compensation when seed source, and is simply obtained by one section of highly nonlinear optical fiber 19
The laser signal of 1064nm wave bands.Three, erbium doped fiber laser femtosecond seed source of the present invention is long using shorter resonator, can
Reduce the quantity of 27 cascaded optical fiber coupler of frequency upgrading part.Four, the present invention is prolonged when close to THz repetition rates using optics
Slow line 25 replaces tail optical fiber length difference used, to realize that THz high repetition frequency femtosecond pulses export.Four, of the invention
Using the MOPA structures of two-stage pre-amplification part 37 and the main amplifier section of two-stage 50, can preferably control nonlinear interaction realize it is high
Power femtosecond pulse laser exports.Five, component all-fiber of the invention encapsulation and modularization, keep whole system structure tight
It gathers, insertion loss is less, and system reliability is high.
In the above-mentioned THz high repetition frequency high powers femto second optical fiber laser 100 based on dispersive wave, swashed using Er-doped fiber
Light device seed source 13 generates the femtosecond pulse signal of higher repetitive frequency, by one section of highly nonlinear optical fiber after this signal is amplified
19 nonlinear frequency conversion, then by the multiple stage frequency lift portion 27 of coupler composition, obtain flying for THz high repetition frequencies
Then pps pulse per second signal passes through the MOPA of Yb dosed optical fiber pre-amplification part 37 and the main amplifier section of two-stage yb-doped double-clad fiber 50
The high repetition frequency femtosecond pulse signal of low-power is amplified to tens watts of laser signal and exported by structure, and to it into an actor's rendering of an operatic tune
Outer Pulse Compression, to obtain the high-power laser signal output of THz high repetition frequencies.The mounting structure of this method is simple,
It is easily achieved, it is of low cost, convenient for promoting.
It should be noted that the foregoing is merely the preferred embodiment of the present invention, it is not intended to restrict the invention, for this
For field technology personnel, the present invention can have various modifications and changes.It is all within spirit and principles of the present invention made by
Any modification, equivalent substitution, improvement and etc. should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of THz high repetition frequency high power femto second optical fiber lasers based on dispersive wave, which is characterized in that including er-doped light
Fibre laser seed source, frequency upgrading part, amplifier section and Pulse Compression part；The erbium doped fiber laser seed source
Output end is connect by highly nonlinear optical fiber with the frequency upgrading part, and the output end of the frequency upgrading part is connected to institute
State amplifier section, the amplifier section includes pre-amplification part and the main amplifier section of two-stage, the output end of the amplifier section with
The Pulse Compression part is connected；The laser signal that the erbium doped fiber laser seed source generates is through the highly nonlinear optical fiber
Nonlinear frequency conversion, and by the frequency upgrading part by its frequency upgrading to THz high repetition frequencies, the THz high
The laser signal of repetition rate carries out power amplification through the pre-amplification part of the amplifier section and the main amplifier section of two-stage, then passes through
The Pulse Compression part is crossed, the high power femtosecond pulse signal of THz high repetition frequencies is exported.
2. the THz high repetition frequency high power femto second optical fiber lasers based on dispersive wave, feature exist as described in claim 1
In the erbium doped fiber laser seed source includes laser seed source and Erbium-doped fiber amplifier part, the laser seed
Source includes sequentially connected light reflection mirror, the first er-doped gain fibre, the first wavelength division multiplexer and the first optoisolator；Described
Two input terminals of one wavelength division multiplexer be connected separately with the first er-doped gain fibre and the first mode pump laser device and
The output end of its driving circuit, two output ends of first wavelength division multiplexer be respectively connected to first optoisolator and
The input terminal of one saturable absorber SESAM module.
3. the THz high repetition frequency high power femto second optical fiber lasers based on dispersive wave, feature exist as claimed in claim 2
In first wavelength division multiplexer includes sequentially connected first optical fiber collimator, optically filtering piece, polarizing film, Wollaston
Prism and the second optical fiber collimator；The input terminal of first optical fiber collimator is connected to by the first er-doped gain fibre
The light reflection mirror.
4. the THz high repetition frequency high power femto second optical fiber lasers based on dispersive wave, feature exist as claimed in claim 2
In, the Erbium-doped fiber amplifier part include the second wavelength division multiplexer, the second mode pump laser device and its driving circuit and the
Two er-doped gain fibres, the input terminal of second wavelength division multiplexer are connected to the output end and second of first optoisolator
The output end of the output end of mode pump laser device and its driving circuit, second wavelength division multiplexer is connected to the second er-doped increasing
Beneficial optical fiber, the Erbium-doped fiber amplifier part are used to be promoted the output power of the erbium doped fiber laser seed source.
5. the THz high repetition frequency high power femto second optical fiber lasers based on dispersive wave, feature exist as claimed in claim 4
In the input terminal of the highly nonlinear optical fiber is connected to the second er-doped gain fibre, the output of the highly nonlinear optical fiber
End is connected to the frequency upgrading part, and the highly nonlinear optical fiber is used to carry out non-linear frequency change to the laser signal of input
It changes.
6. the THz high repetition frequency high power femto second optical fiber lasers based on dispersive wave, feature exist as described in claim 1
In, the frequency upgrading part includes cascade 50/50 fiber coupler, cascade 50/50 fiber coupler include according to
The one 1 × 2nd 50/50 fiber coupler, multiple 2 × 2 50/50 fiber coupler and the 50/50 of the 21 × 2nd of secondary connection
Fiber coupler is adopted between the described one 1 × 2nd 50/50 fiber coupler and the multiple 2 × 2 50/50 fiber coupler
It is connected with optical fiber, is adopted between the multiple 2 × 2 50/50 fiber coupler and the described 21 × 2nd 50/50 fiber coupler
It is connected with optical delay line；The frequency upgrading part is using frequency multiplication step by step, the repetition for fast lifting input laser signal
Frequency.
7. the THz high repetition frequency high power femto second optical fiber lasers based on dispersive wave, feature exist as described in claim 1
In the pre-amplification part includes first order pre-amplification part and second level pre-amplification part, first order pre-amplification part
Including third wavelength division multiplexer, third mode pump laser device and its driving circuit, first mix ytterbium gain fibre and the second light every
From device, the input terminal of the third wavelength division multiplexer is connected to the output end of the frequency upgrading part and third mode pump swashs
Light device and its driving circuit, the third wavelength division multiplexer output end by first mixes ytterbium gain fibre, and to be connected to second optically isolated
Device；Second level pre-amplification part includes the 4th wavelength division multiplexer, the 4th mode pump laser device and its driving circuit, second
Ytterbium gain fibre and third optoisolator are mixed, the input terminal of the 4th wavelength division multiplexer is connected to first pre-amplification part
Output end and the 4th mode pump laser device and its driving circuit, the 4th wavelength division multiplexer output end mix ytterbium by second
Gain fibre is connected to third optoisolator.
8. the THz high repetition frequency high power femto second optical fiber lasers based on dispersive wave, feature exist as described in claim 1
In the main amplifier section includes the main amplifier section in the main amplifier section of the first order and the second level, the main amplifier section of the first order
Including (2+1) × 1 combiner device, a pair of of multimode pump laser and its driving circuit, the first Double Cladding Ytterbium Doped Fiber and first
The input terminal of high power light isolator, (2+1) × 1 combiner device is connected to the output end of second level pre-amplification part
It is mixed by the first double clad with the output end of a pair of of multimode pump laser and its driving circuit, (2+1) × 1 combiner device
Ytterbium optical fiber is connected to the first high power light isolator；The main amplifier section in the second level include (6+1) × 1 combiner device, two groups
Multimode pump laser and its driving circuit, the second Double Cladding Ytterbium Doped Fiber, pumping leakage device, the second high power light isolator and
The input terminal of end cap, (6+1) × 1 combiner device is connected to the output end and two groups of multimodes of the main amplifier section of the first order
Pump laser and its driving circuit, the output end of (6+1) × 1 combiner device by the second Double Cladding Ytterbium Doped Fiber successively
It is connected to leakage of pumping device, the second high power light isolator and end cap.
9. the THz high repetition frequency high power femto second optical fiber lasers based on dispersive wave, feature exist as claimed in claim 8
In the leakage of pumping device is for filtering out residual pump light；The end cap is for expanding output signal light, to avoid right
Fiber end face causes to damage；The first high power light isolator and the second high power light isolator are for laser signal
One-way transmission.
10. the THz high repetition frequency high power femto second optical fiber lasers based on dispersive wave as described in claim 1, feature
It is, the Pulse Compression part includes collimating mirror, diffraction grating to, speculum and outgoing mirror, and the diffraction grating is to being used for
The high power femtosecond pulse signal of output is compressed, realizes the laser pulse signal output of more burst pulse；Laser is believed
It after number by the collimating mirror, is compressed by the diffraction grating pair and the speculum, then is exported through the outgoing mirror.
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