CN109149341A - Passive Harmonic mode-locked fiber laser - Google Patents
Passive Harmonic mode-locked fiber laser Download PDFInfo
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- CN109149341A CN109149341A CN201810989976.4A CN201810989976A CN109149341A CN 109149341 A CN109149341 A CN 109149341A CN 201810989976 A CN201810989976 A CN 201810989976A CN 109149341 A CN109149341 A CN 109149341A
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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
- H01S3/1115—Passive mode locking using intracavity saturable absorbers
- H01S3/1118—Semiconductor saturable absorbers, e.g. semiconductor saturable absorber mirrors [SESAMs]; Solid-state saturable absorbers, e.g. carbon nanotube [CNT] based
-
- 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
- H01S3/1121—Harmonically mode locking lasers, e.g. modulation frequency equals multiple integers or a fraction of the resonator roundtrip time
Abstract
The present invention provides a kind of passive Harmonic mode-locked fiber laser, comprising: pumping, wavelength division multiplexer, gain fibre, the first photo-coupler, the second photo-coupler, fibre optic isolater, three port circulators, semiconductor saturable absorbing mirror SESAM and harmonic mode locking auxiliary device；Harmonic mode locking auxiliary device, for obtaining high-order harmonic wave.Passive Harmonic mode-locked fiber laser provided by the invention, which can be stablized, exports stable high-order harmonic wave mode locking.
Description
Technical field
The present invention relates to mode locked fiber laser technical field more particularly to a kind of passive Harmonic mode-locked fiber lasers.
Background technique
Harmonic mode-locked fiber laser is divided into according to mode locking principle actively locks harmonic wave mode fiber laser and passive harmonic lock
Mode fiber laser two major classes.Passive Harmonic mode-locked fiber laser technology is a kind of non-linear mode locking skill of typical all -fiber
Art, it allows the intracavitary of laser that any active modulator is not present, but femtosecond pulse still may be implemented in optical fiber laser
Output, principle is: in optical fiber laser, generally there are some nonlinear optical effects, the intensity of these optical effects and
The peak value of the pulse of intracavitary operation is related, a kind of such correlation, allows each longitudinal mode PGC demodulation inside laser, this
In the case of, optical fiber laser can export stable picosecond of even femtosecond pulse.
It is existing in the related technology, using nonlinear polarization rotation, using half/quarter-wave plate (H/
) and polarization beam apparatus (PBS) the repetition rate 125.39MHz (3 order harmonics) and 354.97MHz (14 order harmonics) that combine QWP
Mode locking output.
But the passive harmonic mode locking light laser integration of the optical fiber of this space structure is poor, stability is low.
Summary of the invention
The present invention provides a kind of passive Harmonic mode-locked fiber laser, can stablize and export stable high-order harmonic wave.
The one kind that provides of the invention includes: pumping, wavelength division multiplexer, gain fibre, the first photo-coupler, the second optical coupling
Device, fibre optic isolater, three port circulators, semiconductor saturable absorbing mirror SESAM and harmonic mode locking auxiliary device；
The pumping is connect with the first end of the wavelength division multiplexer, the second end of the wavelength division multiplexer and the gain
The first end of optical fiber connects, and the second end of the gain fibre is connect with the first end of first photo-coupler, and described first
The second end of photo-coupler is connect with the first end of second photo-coupler, the second end of second photo-coupler be used for
Spectrometer connection, the second end of second photo-coupler are also used to connect with electric frequency spectrograph and sampling oscilloscope；
The second end of first photo-coupler is also connect with the first end of the fibre optic isolater, the fibre optic isolater
Second end connect with the first end of the harmonic mode locking auxiliary device, the second end of the harmonic mode locking auxiliary device with it is described
The first end of three port circulators connects, and the second end of three port circulator and the first end of the wavelength division multiplexer connect
It connects, the third end of three port circulator is connect with the SESAM；
The harmonic mode locking auxiliary device, for obtaining high-order harmonic wave mode locking.
Optionally, the harmonic mode locking auxiliary device is photonic crystal fiber；
The first end of the photonic crystal fiber is connect with the second end of the fibre optic isolater, the photonic crystal fiber
Second end connect with the first end of three port circulator.
Optionally, the harmonic mode locking auxiliary device is tunable filtering device；
The first end of the tunable filtering device is connect with the second end of the fibre optic isolater, the tunable filtering
The second end of device is connect with the first end of three port circulator.
Optionally, the tunable filtering device includes: third photo-coupler, Polarization Controller and polarization maintaining optical fibre；
The third photo-coupler first input end is connect with the second end of the fibre optic isolater, the third optical coupling
The first output end of device is connect with the first end of the Polarization Controller, the second end of the Polarization Controller and the polarization maintaining optical fibre
First end connection, the second end of the polarization maintaining optical fibre connect with the second input terminal of the third photo-coupler, the third
The second output terminal of photo-coupler is connect with the first end of three port circulator.
Optionally, the Polarization Controller include: the first sub- Polarization Controller, the second sub- Polarization Controller, third son partially
Shake controller, and the polarization maintaining optical fibre includes: the first sub- polarization maintaining optical fibre and the second sub- polarization maintaining optical fibre；
The third photo-coupler first input end is connect with the second end of the fibre optic isolater, the third optical coupling
The first output end of device is connect with the first end of the described first sub- Polarization Controller, the second end of the first sub- Polarization Controller with
The first end of the first sub- polarization maintaining optical fibre connects, the second end and the described second sub- Polarization Control of the first sub- polarization maintaining optical fibre
The first end of device connects, and the second end of the second sub- Polarization Controller is connect with the first end of the described second sub- polarization maintaining optical fibre,
The second end of the second sub- polarization maintaining optical fibre is connect with the first end of the sub- Polarization Controller of the third, the third polarization control
The second end of device processed is connect with the second input terminal of the third photo-coupler, the second output terminal of the third photo-coupler with
The first end of three port circulator connects.
Optionally, the first photo-coupler output first via harmonic wave and the second road harmonic wave, the signal of the first via harmonic wave are strong
The ratio between signal strength of degree and the second road harmonic wave is 9:1；
The first via harmonic wave is input to the fibre optic isolater, first photo-coupler by first photo-coupler
Second road harmonic wave is input to second photo-coupler.
Optionally, the second photo-coupler output third road harmonic wave and the 4th road harmonic wave, the letter of third road harmonic wave
The ratio between number intensity and the signal strength of the 4th road harmonic wave are 1:1.
Optionally, the photonic crystal fiber and the transmission harmonic signal in the passive Harmonic mode-locked fiber laser
Optical fiber is welding connection.
Optionally, the pumping is that single mode semiconductor pumps.
Optionally, the gain fibre is Yb dosed optical fiber.
The present invention provides a kind of passive Harmonic mode-locked fiber laser, comprising: pumping, wavelength division multiplexer, gain fibre,
One photo-coupler, the second photo-coupler, fibre optic isolater, three port circulators, semiconductor saturable absorbing mirror SESAM and harmonic wave
Mode locking auxiliary device；Pumping is connect with the first end of wavelength division multiplexer, and the first of the second end of wavelength division multiplexer and gain fibre
End connection, the second end of gain fibre are connect with the first end of the first photo-coupler, the second end of the first photo-coupler and second
The first end of photo-coupler connects, and the second end of the second photo-coupler with spectrometer for connecting, and the second of the second photo-coupler
End is also used to connect with electric frequency spectrograph and sampling oscilloscope；The second end of first photo-coupler also with the first end of fibre optic isolater
Connection, the second end of fibre optic isolater are connect with the first end of harmonic mode locking auxiliary device, and the second of harmonic mode locking auxiliary device
End is connect with the first end of three port circulators, and the second end of three port circulators and the first end of wavelength division multiplexer connect, and three
The third end of port circulator is connect with SESAM；Harmonic mode locking auxiliary device, for obtaining high-order harmonic wave.It is provided by the invention
Passive Harmonic mode-locked fiber laser, which can be stablized, exports stable high-order harmonic wave.
Detailed description of the invention
Fig. 1 is the linear cavity schematic diagram that passive Harmonic mode-locked fiber laser in the prior art uses；
Fig. 2 is the annular chamber schematic diagram that passive Harmonic mode-locked fiber laser in the prior art uses；
Fig. 3 is the structural schematic diagram one of passive Harmonic mode-locked fiber laser provided by the invention；
Fig. 4 is the structural schematic diagram two of passive Harmonic mode-locked fiber laser provided by the invention；
Fig. 5 is harmonic lock of the provided by the invention one passive Harmonic mode-locked fiber laser when pump power is 180mW
Mould Harmonic Spectrum figure；
Fig. 6 is harmonic lock of the provided by the invention one passive Harmonic mode-locked fiber laser when pump power is 180mW
Mould time domain sequences figure；
Fig. 7 is harmonic lock of the provided by the invention one passive Harmonic mode-locked fiber laser when pump power is 180mW
Mode spectrum performance plot；
Fig. 8 is harmonic mode locking order-pump-power chart of provided by the invention one passive Harmonic mode-locked fiber laser；
Fig. 9 is the spectral characteristic figure of 12 order harmonics mode lockings of provided by the invention one passive Harmonic mode-locked fiber laser
One；
Figure 10 is the spectral characteristic figure of 12 order harmonics mode lockings of provided by the invention one passive Harmonic mode-locked fiber laser
Two；
Figure 11 is the schematic diagram three of passive Harmonic mode-locked fiber laser provided by the invention；
Figure 12 is multiple high-order harmonic wave mode locking schematic diagrames of another passive Harmonic mode-locked fiber laser provided by the invention；
Figure 13 is spectrogram of the another passive Harmonic mode-locked fiber laser provided by the invention in 2 order harmonics mode lockings, with
And the transmission spectrogram of tunable filtering device；
Figure 14 is spectrogram of the another passive Harmonic mode-locked fiber laser provided by the invention in 5 order harmonics mode lockings, with
And the transmission spectrogram of tunable filtering device；
Figure 15 is spectrogram of the another passive Harmonic mode-locked fiber laser provided by the invention in 8 order harmonics mode lockings, with
And the transmission spectrogram of tunable filtering device；
Figure 16 is spectrogram of the another passive Harmonic mode-locked fiber laser provided by the invention in 13 order harmonics mode lockings, with
And the transmission spectrogram of tunable filtering device；
Figure 17 is spectrogram of the another passive Harmonic mode-locked fiber laser provided by the invention in 17 order harmonics mode lockings；
Figure 18 is time domain sequences of the another passive Harmonic mode-locked fiber laser provided by the invention in 17 order harmonics mode lockings
Figure；
Figure 19 is spectral characteristic of the another passive Harmonic mode-locked fiber laser provided by the invention in 17 order harmonics mode lockings
Figure one；
Figure 20 is spectral characteristic of the another passive Harmonic mode-locked fiber laser provided by the invention in 17 order harmonics mode lockings
Figure two；
Figure 21 is harmonic mode locking order-harmonic mode locking arteries and veins of another passive Harmonic mode-locked fiber laser provided by the invention
Rush the schematic diagram of signal-to-noise ratio；
Figure 22 is that harmonic mode locking order-super model of another passive Harmonic mode-locked fiber laser provided by the invention inhibits ratio
Schematic diagram.
Description of symbols:
11- semiconductor saturable absorbing mirror SESAM；
12- photo-coupler；
The first photo-coupler of 121-；
The second photo-coupler of 122-；
13- gain fibre；
14- pumping；
15- wavelength division multiplexer；
16- high reflection fiber grating；
Tri- port circulator of 17-；
18- harmonic mode locking auxiliary device；
181- third photo-coupler；
The first Polarization Controller of 182-；
The second Polarization Controller of 183-；
184- third Polarization Controller；
The first polarization maintaining optical fibre of 185-；
The second polarization maintaining optical fibre of 184-.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the embodiment of the present invention, to this
Technical solution in inventive embodiments is clearly and completely described, it is clear that described embodiment is that a part of the invention is real
Example is applied, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creation
Property labour under the premise of every other embodiment obtained, shall fall within the protection scope of the present invention.
Passive Harmonic mode-locked fiber laser provided by the invention is the light based on semiconductor saturable absorbing mirror SESAM11
Fibre laser, semiconductor saturable absorbing mirror (SESAM11) integrate reflecting mirror and saturable absorber, utilize molecule
Beam epitaxy technology grows the single layer even saturable absorber of multilayer directly on the substrate of semiconductor mirror.It is usually used
GaAs GaAs is as substrate, alternating growth GaAs and aluminium arsenide AlAs on substrate.The crystalline substance of both materials of GaAs and AlAs
Lattice constant is very close, while less to the absorption of light energy, and then the difference of the refractive index using the two, can be on substrate
Extension generates Bragg mirror.On this basis, continued growth single layer or the Gallium indium arsenide InGaAs of multilayer can shapes
At saturable absorber.
The basic principle of harmonic mode locking is realized based on the passive Harmonic mode-locked fiber laser mode locking of SESAM11 are as follows: Dang Guangmai
Punching is when passing through semiconductor saturable absorber, and the edge portions of light pulse are since transmitance is lower, and most of energy is depleted, phase
For the pulse center portion answered because transmitance is higher, the ability of loss is smaller.Pulse is lost by gain media and is compensated, with
Pulse repeatedly pass through semiconductor saturable absorbing mirror, the intensity relative value of pulse center portion and edge portions is increasing,
Pulse is constantly narrowed, final to realize mode locking output.
Fig. 1 is the linear cavity schematic diagram that passive Harmonic mode-locked fiber laser in the prior art uses, in the prior art
The passive Harmonic mode-locked fiber laser with linear cavity usually by SESAM11, photo-coupler 12, gain fibre 13, pumping
14, wavelength division multiplexer 15 and high reflection fiber grating 16 form；
Fig. 2 is the annular chamber schematic diagram that passive Harmonic mode-locked fiber laser in the prior art uses, in the prior art
The passive Harmonic mode-locked fiber laser with annular chamber usually by SESAM11, photo-coupler, gain fibre 13, pumping 14,
Wavelength division multiplexer 15 and three port circulators 17 composition；In the prior art using linear cavity or the passive harmonic mode locking of annular chamber
The order of the harmonic mode locking of optical fiber laser output is not high, and the harmonic mode locking stability exported is not high.
Fig. 3 is the structural schematic diagram one of passive Harmonic mode-locked fiber laser provided by the invention, as shown in Figure 1, this reality
The passive Harmonic mode-locked fiber laser for applying example offer includes: pumping 14, wavelength division multiplexer 15, gain fibre 13, the first optocoupler
Clutch 121, the second photo-coupler 122, fibre optic isolater, three port circulators 17, semiconductor saturable absorbing mirror SESAM11 and
Harmonic mode locking auxiliary device 18.
Wherein, pumping 14 is connect with the first end of wavelength division multiplexer 15, wherein the pumping 14 in the present embodiment can use
The single mode semiconductor pumping 14 of 976nm, which is coupled into gain fibre by 980/1060 wavelength division multiplexer 15 (WDM)
13, the maximum power 600mW which provides.The second end of wavelength division multiplexer 15 and the first end of gain fibre 13 connect
It connects, the gain fibre 13 in the present embodiment can be, but not limited to as Yb dosed optical fiber, erbium-doped fiber etc.；The second end of gain fibre 13
It is connect with the first end of the first photo-coupler 121, the first of the second end of the first photo-coupler 121 and the second photo-coupler 122
End connection, for connecting with spectrometer, the second end of the second photo-coupler 122 is also used to the second end of the second photo-coupler 122
It is connect with electric frequency spectrograph and sampling oscilloscope.Spectrometer in the present embodiment is used to show the spectrogram of the harmonic wave of output, sampling
Oscillograph is used to show that the time domain sequences figure of the harmonic wave of output, sampling oscilloscope electricity, frequency spectrograph to be used to show the harmonic wave of output
Spectral characteristic figure.
Specifically, when the second end of the second photo-coupler 122 is connect with electric frequency spectrograph and sampling oscilloscope, the second optical coupling
The second end of device 122 is first connect with photoelectric converter, which can connect with electric frequency spectrograph and sampling oscilloscope respectively.
It can judge whether the harmonic wave of output is in harmonic mode locking state from spectrogram and time domain sequences figure in the present embodiment, if being in
Harmonic mode locking state can be inhibited using the signal-to-noise ratio and/or super model of the harmonic wave of output than judgement in the spectral characteristic figure of harmonic wave
Whether the harmonic mode locking is in stable state, specifically, may be provided with signal-to-noise ratio and/or super model inhibition in advance than corresponding threshold
Value signal-to-noise ratio and/or threshold value super model inhibit than judging whether the harmonic mode locking is in stable state.
The second end of first photo-coupler 121 is also connect with the first end of fibre optic isolater, the second end of fibre optic isolater
It is connect with the first end of harmonic mode locking auxiliary device 18, the second end of harmonic mode locking auxiliary device 18 and three port circulators 17
First end connection, the second end of three port circulators 17 are connect with the first end of wavelength division multiplexer 15, three port circulators 17
Third end is connect with SESAM11.
Harmonic mode locking auxiliary device 18 in the present embodiment, for obtaining high-order harmonic wave, specific available stability
High high-order harmonic wave mode locking, specifically, the harmonic mode locking auxiliary device 18 in the present embodiment can be, but not limited to as photonic crystal
Optical fiber, tunable filtering device etc..As long as can be realized the output of stable high-order harmonic wave mode locking.
The present invention provides a kind of passive Harmonic mode-locked fiber laser, comprising: pumping 14, wavelength division multiplexer 15, gain light
Fine 13, first photo-coupler 121, the second photo-coupler 122, fibre optic isolater, three port circulators 17, semiconductor saturable are inhaled
Receive mirror SESAM11 and harmonic mode locking auxiliary device 18；Pumping 14 is connect with the first end of wavelength division multiplexer 15, wavelength division multiplexer 15
Second end connect with the first end of gain fibre 13, the first end of the second end of gain fibre 13 and the first photo-coupler 121
Connection, the second end of the first photo-coupler 121 connect with the first end of the second photo-coupler 122, and the of the second photo-coupler 122
For connecting with spectrometer, the second end of the second photo-coupler 122 is also used to connect with electric frequency spectrograph and sampling oscilloscope at two ends；
The second end of first photo-coupler 121 is also connect with the first end of fibre optic isolater, the second end and harmonic lock of fibre optic isolater
The first end of mould auxiliary device 18 connects, and the first end of the second end of harmonic mode locking auxiliary device 18 and three port circulators 17 connects
Connect, the second end of three port circulators 17 is connect with the first end of wavelength division multiplexer 15, the third end of three port circulators 17 with
SESAM11 connection；Harmonic mode locking auxiliary device 18, for obtaining high-order harmonic wave mode locking.Passive harmonic mode locking provided by the invention
Optical fiber laser, which can be stablized, exports stable high-order harmonic wave mode locking.
On the basis of the above embodiments, below to the harmonic mode locking auxiliary device in passive Harmonic mode-locked fiber laser
A kind of 18 achievable structure is described in detail, and Fig. 4 is the knot of passive Harmonic mode-locked fiber laser provided by the invention
Structure schematic diagram two, as shown in figure 4, the harmonic mode locking auxiliary device 18 in the present embodiment is photonic crystal fiber.
Wherein, the first end of photonic crystal fiber and the second end of fibre optic isolater connect, and the second of photonic crystal fiber
End is connect with the first end of three port circulators 17.
Pumping 14 in the present embodiment is single mode semiconductor pumping 14, and gain fibre 13 is Yb dosed optical fiber, specifically, this is mixed
The length of ytterbium optical fiber is 2.0m, and absorption coefficient is 250dB at 975nm.In the present embodiment, using polarization-maintaining heat sealing machine to photon crystalline substance
Body optical fiber and general single mode fiber carry out welding, greatly reduce splice loss, splice attenuation, utilize the acoustooptical effect in photonic crystal fiber
With high non-linearity effect, harmonic mode locking output is realized.Wherein, the passive Harmonic mode-locked fiber laser provided in the present embodiment
The length of entire annular chamber is 38m.
The first photo-coupler 121 output first via harmonic wave and the second road harmonic wave in the present embodiment, the letter of first via harmonic wave
The ratio between number intensity and the signal strength of the second road harmonic wave are 9:1, the first photo-coupler 121 by first via harmonic wave be input to optical fiber every
From device, the second road harmonic wave is input to the second photo-coupler 122 by the first photo-coupler 121, i.e., by 10% conduct of harmonic wave intensity
Monitoring output.Wherein, the second photo-coupler 122 output third road harmonic wave and the 4th road harmonic wave, the signal strength of third road harmonic wave
It is 1:1 with the ratio between the signal strength of the 4th road harmonic wave.Specifically, third road harmonic wave is input to spectrum by the second photo-coupler 122
4th road harmonic wave is input to electric frequency spectrograph and sampling oscilloscope by photoelectric converter by instrument.
Wherein, Fig. 5 is provided by the invention one passive Harmonic mode-locked fiber laser when pumping 14 power and being 180mW
Harmonic mode locking Harmonic Spectrum figure, Fig. 6 is provided by the invention one passive Harmonic mode-locked fiber laser is pumping 14 power
Harmonic mode locking time domain sequences figure when 180mW, Fig. 7 are provided by the invention one passive Harmonic mode-locked fiber laser in pumping 14
Harmonic mode locking spectral characteristic figure when power is 180mW, the present embodiment are added after photonic crystal fiber in resonant cavity, compensate
Intracavitary positive dispersion can obtain and stablize and the harmonic mode locking of high-order.Increase to 180mW, optical fiber laser when pumping 14 power
It is as shown in Figure 5-Figure 7 to measure mode-locked spectrum figure at this time, time domain sequences figure, spectral characteristic figure difference for self-starting modelocking.
As shown in Fig. 5 mode-locked spectrum figure, the central wavelength of harmonic mode locking spectrogram is 1040.4nm, measures three dB bandwidth
For 11.3nm, the spectrogram of traditional orphan is shown as.Further, as shown in the time domain sequences figure of Fig. 6, harmonic mode locking is corresponding
194.8ns is divided between pulse.The pulse corresponding spectral characteristic figure is as shown in fig. 7, the corresponding pulse of harmonic mode locking
Repetition rate is 5.13MHz, and in the scanning range of 0-200MHz, the super model of pulse inhibits than being greater than 20dB.It can be seen that adopting
Harmonic mode locking may be implemented in the passive Harmonic mode-locked fiber laser for using photonic crystal fiber as harmonic mode locking auxiliary device 18
Output.
Fig. 8 is harmonic mode locking order -14 power diagram of pumping of provided by the invention one passive Harmonic mode-locked fiber laser,
As shown in figure 8, increasing by 14 power of pumping, it is able to observe that harmonic mode locking phenomenon, and as 14 power of pumping increase, mode locking arteries and veins
The repetition rate of punching gradually increases.In other words, harmonic order number increases as 14 power of pumping increase.
Specifically, the mode locking of available fundamental frequency to 12 order harmonics exports as can be seen that pumping 14 power with increasing,
Such as when increasing by 14 power of pumping to 200mW, pulse recurrence frequency is about 10.3MHz (2nd HML, 2 ranks)；Continue growing pumping
For 14 power to 340mW, pulse recurrence frequency is 25.65MHz (5th HML, 5 ranks).When increasing by 14 power of pumping to 510mW, lock
The repetition rate of mould pulse is 61.6MHz (12th HML, 12 ranks), is that the harmonic wave of the most high-order obtained in this experiment repeats frequency
Rate.
Wherein, Fig. 9 is that the frequency spectrum of 12 order harmonics mode lockings of provided by the invention one passive Harmonic mode-locked fiber laser is special
Property figure one, Figure 10 be provided by the invention one passive Harmonic mode-locked fiber laser 12 order harmonics mode lockings spectral characteristic figure
Two, as shown in figure 9, the pulse signal-to-noise ratio of 12 order harmonics mode lockings is greater than 40dB；As shown in Figure 10, super model inhibits ratio to be greater than
29.3dB。
Further, when the power of the pumping 14 in the present embodiment increases to 57 0mW, the harmonic mode locking pair of the output
The repetition rate for the pulse answered remains unchanged.
The harmonic mode locking auxiliary device 18 in passive Harmonic mode-locked fiber laser provided in the present embodiment is that photon is brilliant
Body optical fiber, the first end of photonic crystal fiber and the second end of fibre optic isolater connect, the second end of photonic crystal fiber and three
The first end of port circulator 17 connects.Passive Harmonic mode-locked fiber laser provided in this embodiment can be realized 12 rank of highest
Harmonic mode locking, and export 12 order harmonics mode lockings have high stability.
Below with reference to Figure 11 to the harmonic mode locking auxiliary device in passive Harmonic mode-locked fiber laser provided by the invention
The achievable structure of another of 18 is described in detail, and Figure 11 is passive Harmonic mode-locked fiber laser provided by the invention
Schematic diagram three, as shown in figure 11, the harmonic mode locking auxiliary device 18 in Harmonic mode-locked fiber laser provided in this embodiment can
Think tunable filtering device.
Wherein, the first end of tunable filtering device and the second end of fibre optic isolater connect, tunable filtering device
Second end is connect with the first end of three port circulators 17.Gain fibre 13 in the present embodiment is Yb dosed optical fiber, specifically, can
It is set as 1.6m.
The first photo-coupler 121 output first via harmonic wave and the second road harmonic wave in the present embodiment, the letter of first via harmonic wave
The ratio between number intensity and the signal strength of the second road harmonic wave are 9:1, the first photo-coupler 121 by first via harmonic wave be input to optical fiber every
From device, the second road harmonic wave is input to the second photo-coupler 122 by the first photo-coupler 121, i.e., by 10% conduct of harmonic wave intensity
Monitoring output.Wherein, the second photo-coupler 122 output third road harmonic wave and the 4th road harmonic wave, the signal strength of third road harmonic wave
It is 1:1 with the ratio between the signal strength of the 4th road harmonic wave.Specifically, third road harmonic wave is input to spectrum by the second photo-coupler 122
4th road harmonic wave is input to electric frequency spectrograph and sampling oscilloscope by photoelectric converter by instrument.
Specifically, tunable filtering device includes: third photo-coupler 181, Polarization Controller and polarization maintaining optical fibre.
Wherein, the second end of 181 first input end of third photo-coupler and fibre optic isolater connects, third photo-coupler
The connection of the first end of 181 first output ends and Polarization Controller, the second end of Polarization Controller and the first end of polarization maintaining optical fibre connect
It connects, the second end of polarization maintaining optical fibre is connect with the second input terminal of third photo-coupler 181, and the second of third photo-coupler 181 is defeated
Outlet is connect with the first end of three port circulators 17.
Further, the Polarization Controller in the present embodiment includes: the first sub- Polarization Controller, the second sub- Polarization Control
The sub- Polarization Controller of device, third, polarization maintaining optical fibre include: the first sub- polarization maintaining optical fibre and the second sub- polarization maintaining optical fibre.
Wherein, the second end of 181 first input end of third photo-coupler and fibre optic isolater connects, third photo-coupler
181 first output ends are connect with the first end of the first sub- Polarization Controller, the second end of the first sub- Polarization Controller and the first son
The first end of polarization maintaining optical fibre connects, and the second end of the first sub- polarization maintaining optical fibre is connect with the first end of the second sub- Polarization Controller, the
The second end of two sub- Polarization Controllers is connect with the first end of the second sub- polarization maintaining optical fibre, the second end of the second sub- polarization maintaining optical fibre and the
The first ends of three sub- Polarization Controllers connects, and the second of the second end of the sub- Polarization Controller of third and third photo-coupler 181 is defeated
Enter end connection, the second output terminal of third photo-coupler 181 is connect with the first end of three port circulators 17.
Two sections of polarization maintaining optical fibres (PMF) in the present embodiment provide a large amount of nonlinear birefringence, and then inclined by adjusting
Vibration controller can change intracavitary nonlinear birefringence.That is by adjusting Polarization Controller, so that it may easily
Change tunable filtering device bandwidth.It should be noted that keep 14 power of pumping constant in experimentation, harmonic mode locking
Realization rely primarily on adjust Polarization Controller realize adjust filter bandwidht.
It is 200mW pumping 14 power by adjusting filter after tunable filtering device is added in annular chamber
When, optical fiber laser can realize self-starting modelocking.Passive Harmonic mode-locked fiber laser provided in this embodiment is increasing pumping
When 14 power are to 240mW, Polarization Controller in tunable filter, the average output power for measuring mode locking pulse at this time is
1.91mW considerably increases the mean power of the harmonic mode locking of output, improves the power of the harmonic mode locking of output.
In the present embodiment, the phenomenon that continuing growing 14 power of pumping to 350mW, observed multiple-pulse.Pass through increasing pump
14 power of Pu and tunable filtering device, multiple-pulse phenomenon evolve as harmonic mode locking phenomenon.It is 400mW pumping 14 power
When, it can be observed that the output of the harmonic mode locking of 12 rank of highest.Discovery simultaneously passes through tune in the case where 14 power of pumping are constant
The bandwidth for saving tunable filtering device, may be implemented the flexible switching between harmonic mode locking order.Further, 14 function are being pumped
When rate increases to 450mW, it is observed that harmonic fundamental frequency is exported to 17 order harmonics mode lockings by the bandwidth of tunable filtering device
Conversion.
Specifically, Figure 12 is multiple high-order harmonic wave mode lockings of another passive Harmonic mode-locked fiber laser provided by the invention
Schematic diagram respectively illustrates the repetition frequency obtained using the passive Harmonic mode-locked fiber laser provided in the present embodiment in Figure 12
Rate 19.7MHz (2nd HML, 2 ranks), 49.4MHz (5th HML, 5 ranks), 78.9MHz (8th HML, 8 ranks), 108.6MHz
(11th HML, 11 ranks), the corresponding time domain sequences figure of 148.1MHz (15thHML, 2 ranks).
Further, Figure 13 is another passive Harmonic mode-locked fiber laser provided by the invention in 2 order harmonics mode lockings
Spectrogram, and, the transmission spectrogram of tunable filtering device, Figure 14 swashs for another passive harmonic mode locking optical fiber provided by the invention
Light device 5 order harmonics mode lockings spectrogram, and, the transmission spectrogram of tunable filtering device, Figure 15 be it is provided by the invention again
One passive Harmonic mode-locked fiber laser 8 order harmonics mode lockings spectrogram, and, the transmission spectrogram of tunable filtering device,
Figure 16 is spectrogram of the another passive Harmonic mode-locked fiber laser provided by the invention in 13 order harmonics mode lockings, and, it is adjustable
The transmission spectrogram of humorous filter observes that the bandwidth of tunable filtering device is smaller as shown in Figure 13-Figure 16, corresponding humorous
The repetition rate of wave mode locking is higher.
It using homemade test of light source in the order of harmonic mode locking is respectively 2 ranks, 5 ranks, 8 ranks, 13 ranks in the present embodiment
When tunable filtering device transmission spectrum, specifically can be respectively as shown in Figure 13-Figure 16.Specifically, in the order of harmonic mode locking
The bandwidth of tunable filtering device when respectively 2 ranks, 5 ranks, 8 ranks, 13 rank be respectively 7.16nm, 3.98nm, 3.14nm and
2.81nm.The central wavelength of the corresponding mode-locked spectrum of different harmonic mode lockings is slightly different, as shown in Figure 13-Figure 16, this can
The spectrogram of the harmonic mode locking of corresponding order is inserted in the schematic diagram of the bandwidth of tuning filtering device respectively.
Specifically, the bandwidth of the mode-locked spectrum when the order of harmonic mode locking is respectively 2 ranks, 5 ranks, 8 ranks, 13 rank is respectively
5.68nm,2.74nm,2.34nm,2.14nm.Wherein it was determined that when the order of harmonic mode locking is identical, the light of harmonic mode locking
The wide bandwidth less than tunable filtering device of bands of a spectrum can play the role of spectral filtering, while be observed that high repetition frequency
Rate corresponds to relatively narrow mode-locked spectrum.
Further, in passive Harmonic mode-locked fiber laser provided in this embodiment, the increase of 14 power is being pumped
When to 450mW, it is observed that 17 order harmonics mode lockings export by the bandwidth of tunable filtering device, the harmonic mode locking is corresponding
The repetition rate of pulse is 167.8MHz.Swash in the passive harmonic wave dissipative solitons mode locking Yb dosed optical fiber of reported Totally positive dispersion cavity
In light device, 167.8MHz is the highest pulse recurrence frequency of dissipative solitons mode locking.
Figure 17 is spectrogram of the another passive Harmonic mode-locked fiber laser provided by the invention in 17 order harmonics mode lockings, figure
18 be another passive Harmonic mode-locked fiber laser provided by the invention in the time domain sequences figure of 17 order harmonics mode lockings, and Figure 19 is this
The another passive Harmonic mode-locked fiber laser provided is invented in the spectral characteristic figure one of 17 order harmonics mode lockings, Figure 20 is the present invention
Spectral characteristic figure two of the another passive Harmonic mode-locked fiber laser provided in 17 order harmonics mode lockings.
As shown in figure 17, the Harmonic Spectrum that the spectrogram of mode locking pulse is shown is similar rectangle, and spectral edges are precipitous, tool
There is the characteristic feature of the spectrum of dissipative solitons mode locking pulse.The central wavelength of the corresponding pulse of harmonic mode locking is 1043.8nm,
The bandwidth of 20dB is 2.7nm.As shown in figure 18, the pulse shown in the time-domain pulse train figure of the corresponding pulse of harmonic mode locking
Envelope has amplitude modulation effect.As shown in figure 19, it when frequency spectrograph sweep bandwidth is 400MHZ, and scanning accuracy is 1kHz, surveys
The super model for obtaining the corresponding pulse of harmonic mode locking inhibits than being greater than 3 8dB；As shown in figure 20, it is in the sweep bandwidth of frequency spectrograph
2MHz, when scanning accuracy is 10Hz, the signal-to-noise ratio for measuring the corresponding pulse of harmonic mode locking is about 68dB.Thus, working as harmonic wave
When the corresponding pulse recurrence frequency of mode locking is 167.8MHz, passive Harmonic mode-locked fiber laser provided by the invention, which is in, to be stablized
Mode-lock status.
Further, Figure 21-Figure 22 is respectively to the humorous of passive Harmonic mode-locked fiber laser output provided in this embodiment
The corresponding harmonic mode locking pulse signal-to-noise ratio of wave mode locking, super model inhibit ratio to be shown.Figure 21 is another quilt provided by the invention
Harmonic mode locking order-harmonic mode locking pulse signal-to-noise ratio schematic diagram of dynamic Harmonic mode-locked fiber laser, Figure 22 mention for the present invention
The harmonic mode locking order of the another passive Harmonic mode-locked fiber laser supplied-super model inhibits the schematic diagram of ratio.
Specifically, the signal-to-noise ratio of the corresponding pulse of harmonic mode locking and super model inhibit ratio, it is a weight for measuring harmonic mode locking
Want performance indicator.
Figure 21-Figure 22 is corresponding to the harmonic mode locking of passive Harmonic mode-locked fiber laser output provided in this embodiment respectively
Pulse fundamental frequency to 17 order harmonics signal-to-noise ratio and super model inhibit ratio.It is available in Figure 21, from fundamental frequency to 17 order harmonics
The signal-to-noise ratio of the corresponding pulse of harmonic mode locking be both greater than 65dB；It is available in Figure 22, from fundamental frequency to the humorous of 17 order harmonics
The corresponding pulse super model of wave mode locking inhibits than being greater than 35dB, which further demonstrates passive harmonic lock provided in this embodiment
Mode fiber laser can work in the stable mode-locking state of higher-order number.
In addition to this, to can be realized harmonic mode locking in passive Harmonic mode-locked fiber laser provided in this embodiment corresponding
Except the fundamental frequency of pulse to 17 order harmonics, it was further observed that trapezoidal harmonic mode locking spectrogram.Specifically, being pumping 14 power
When 350mW, by the bandwidth of tunable filtering device, the trapezoidal harmonic mode locking spectrum of harmonic mode locking can be observed.Illustratively,
By the bandwidth of tunable filtering device, specifically, by adjusting the Polarization Controller in tunable filtering device, the ladder of output
The central wavelength of shape harmonic mode locking spectrum is adjustable from 1031.0nm to 1071.9nm, tunable range 40.9nm.
In the present embodiment, harmonic mode locking auxiliary device 18 is tunable filtering device, and tunable filtering device includes: third
Photo-coupler 181, Polarization Controller and polarization maintaining optical fibre, Polarization Controller include: the first sub- Polarization Controller, the second son polarization control
Device processed, the sub- Polarization Controller of third, polarization maintaining optical fibre includes: the first sub- polarization maintaining optical fibre and the second sub- polarization maintaining optical fibre.In the present embodiment
The passive Harmonic mode-locked fiber laser provided, which can be realized to export, stablizes highest order as the harmonic mode locking of 17 ranks, and is keeping
Pump 14 power it is immovable under the premise of, pass through adjust tunable filtering device bandwidth, passive Harmonic mode-locked fiber laser
It can be realized the flexible switching of fundamental frequency to 17 rank dissipative solitons harmonic mode lockings.Further, in addition to the rectangle spectrum of dissipative solitons
Outside, by the Polarization Controller in tunable filtering device, mode-locked spectrum may be implemented between rectangle spectrum and trapezoidal spectrum
Mutual switching.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of passive Harmonic mode-locked fiber laser characterized by comprising pumping, wavelength division multiplexer, gain fibre,
One photo-coupler, the second photo-coupler, fibre optic isolater, three port circulators, semiconductor saturable absorbing mirror SESAM and harmonic wave
Mode locking auxiliary device；
The pumping is connect with the first end of the wavelength division multiplexer, the second end of the wavelength division multiplexer and the gain fibre
First end connection, the second end of the gain fibre connect with the first end of first photo-coupler, first optocoupler
The second end of clutch is connect with the first end of second photo-coupler, and the second end of second photo-coupler is used for and spectrum
Instrument connection, the second end of second photo-coupler are also used to connect with electric frequency spectrograph and sampling oscilloscope；
The second end of first photo-coupler is also connect with the first end of the fibre optic isolater, and the of the fibre optic isolater
Two ends are connect with the first end of the harmonic mode locking auxiliary device, the second end of the harmonic mode locking auxiliary device and three end
The first end connection of mouth circulator, the second end of three port circulator are connect with the first end of the wavelength division multiplexer, institute
The third end for stating three port circulators is connect with the SESAM；
The harmonic mode locking auxiliary device, for obtaining high-order harmonic wave mode locking.
2. passive Harmonic mode-locked fiber laser according to claim 1, which is characterized in that the harmonic mode locking auxiliary dress
It is set to photonic crystal fiber；
The first end of the photonic crystal fiber is connect with the second end of the fibre optic isolater, and the of the photonic crystal fiber
Two ends are connect with the first end of three port circulator.
3. passive Harmonic mode-locked fiber laser according to claim 1, which is characterized in that the harmonic mode locking auxiliary dress
It is set to tunable filtering device；
The first end of the tunable filtering device is connect with the second end of the fibre optic isolater, the tunable filtering device
Second end connect with the first end of three port circulator.
4. passive Harmonic mode-locked fiber laser according to claim 3, which is characterized in that the tunable filtering device
It include: third photo-coupler, Polarization Controller and polarization maintaining optical fibre；
The third photo-coupler first input end is connect with the second end of the fibre optic isolater, the third photo-coupler
One output end is connect with the first end of the Polarization Controller, and the of the second end of the Polarization Controller and the polarization maintaining optical fibre
One end connection, the second end of the polarization maintaining optical fibre are connect with the second input terminal of the third photo-coupler, the third optocoupler
The second output terminal of clutch is connect with the first end of three port circulator.
5. passive Harmonic mode-locked fiber laser according to claim 4, which is characterized in that the Polarization Controller packet
Include: the first sub- Polarization Controller, the second sub- Polarization Controller, the sub- Polarization Controller of third, the polarization maintaining optical fibre include: the first son
Polarization maintaining optical fibre and the second sub- polarization maintaining optical fibre；
The third photo-coupler first input end is connect with the second end of the fibre optic isolater, the third photo-coupler
One output end is connect with the first end of the described first sub- Polarization Controller, the second end of the first sub- Polarization Controller with it is described
The first end of first sub- polarization maintaining optical fibre connects, second end and the described second sub- Polarization Controller of the first sub- polarization maintaining optical fibre
First end connection, the second end of the second sub- Polarization Controller is connect with the first end of the described second sub- polarization maintaining optical fibre, described
The second end of second sub- polarization maintaining optical fibre is connect with the first end of the sub- Polarization Controller of the third, the sub- Polarization Controller of third
Second end connect with the second input terminal of the third photo-coupler, the second output terminal of the third photo-coupler with it is described
The first end of three port circulators connects.
6. passive Harmonic mode-locked fiber laser according to claim 1-5, which is characterized in that the first optical coupling
Device exports first via harmonic wave and the second road harmonic wave, the signal strength of the signal strength of the first via harmonic wave and the second road harmonic wave it
Than for 9:1；
The first via harmonic wave is input to the fibre optic isolater by first photo-coupler, and first photo-coupler is by institute
It states the second road harmonic wave and is input to second photo-coupler.
7. passive Harmonic mode-locked fiber laser according to claim 6, which is characterized in that second photo-coupler is defeated
Third road harmonic wave and the 4th road harmonic wave out, the signal strength of third road harmonic wave and the ratio between the signal strength of the 4th road harmonic wave are
1:1。
8. passive Harmonic mode-locked fiber laser according to claim 2, which is characterized in that the photonic crystal fiber with
The optical fiber of transmission harmonic signal in the passive Harmonic mode-locked fiber laser is welding connection.
9. passive Harmonic mode-locked fiber laser according to claim 1, which is characterized in that the pumping is that single mode is partly led
Body pumping.
10. passive Harmonic mode-locked fiber laser according to claim 1, which is characterized in that the gain fibre is to mix
Ytterbium optical fiber.
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