CN106129791B - Gao Zhongying Harmonic mode-locked fiber laser based on external continuous light injection - Google Patents
Gao Zhongying Harmonic mode-locked fiber laser based on external continuous light injection Download PDFInfo
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- CN106129791B CN106129791B CN201610806874.5A CN201610806874A CN106129791B CN 106129791 B CN106129791 B CN 106129791B CN 201610806874 A CN201610806874 A CN 201610806874A CN 106129791 B CN106129791 B CN 106129791B
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- wavelength division
- division multiplexer
- fiber laser
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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
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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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
- H01S3/1112—Passive mode locking
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- Optics & Photonics (AREA)
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Abstract
The present invention relates to the Gao Zhongying Harmonic mode-locked fiber lasers based on external continuous light injection, are made of laser pumping source, wavelength division multiplexer, optoisolator, continuous radiant, photo-coupler, saturable absorber and gain fibre；The laser pumping source is connected to the pumping input terminal of wavelength division multiplexer, photo-coupler is accessed jointly with the continuous radiant after the wavelength division multiplexer connection optoisolator, photo-coupler includes that a laser signal output end and a signal connect output end, signal connection output end is sequentially connected the saturable absorber and gain fibre, and gain fibre is connect with wavelength division multiplexer again；The fibre core of gain fibre is doped with light emitting ionic.The configuration of the present invention is simple, it is at low cost, and by the structure of continuous radiant combination passive mode-locking fiber laser, the harmonic mode locking of Superhigh repetition rate is realized, and the light pulse of output is made to have the advantages that repetition rate is high, pulse width is narrow.
Description
Technical field
The present invention relates to mode locked fiber lasers, belong to fiber laser technology field, it is more particularly related to
Gao Zhongying Harmonic mode-locked fiber laser based on external continuous light injection.
Background technique
Laser is the mankind in one of 20th century greatest invention, is ground with the development of society, it has become science
Study carefully and one of tool mostly important in industrial production.In recent years, ultrashort pulse fiber laser becomes worldwide
Research hotspot.Wherein, high pulse repetition frequency ultra-short pulse laser device is in high speed Optical Sampling, optical frequency com, high speed morphometry, too
The fields such as Hertz wave generation have a wide range of applications.With the innovation and development and high-dopant concentration of optical fiber laser mode locking theory
The progress of optic fibre manufacturing technology, the repetition rate of optical fiber laser have had significant raising, however compared with titanium precious stone laser
There are also a certain distance for device.And optical fiber laser has the advantages that good beam quality, high conversion efficiency, therefore, develops high performance
Gao Zhongying ultrashort pulse fiber laser has important practical significance and application value.The weight of passive mode-locking fiber laser at present
Complex frequency is less than 200MHZ mostly, this is not able to satisfy demand of the every field to high repetition laser, it is therefore desirable to grind
Make the optical fiber laser of more high repetition frequency.It can produce GHz magnitude using active mode locking or passive harmonic mode locking technology
Light pulse, but active mode locking needs HF signal generator and modulator, increases cost and complexity, pulsewidth is a picosecond amount
Grade；And traditional passive harmonic mode locking is easy to produce biggish time chirp and amplitude jitter relative to fundamental frequency mode locking, stability
It is low.The quality for the high repetition frequency light pulse that the above method is realized is not ideal enough, it is therefore desirable to develop new technology, new departure comes
Realize high repetition frequency ultrashort pulse fiber laser.
Summary of the invention
Based on the above technical problem, the present invention provides a kind of Gao Zhongying harmonic mode locking light based on external continuous light injection
Fibre laser so that it is at high cost to solve previous optical fiber laser structure complexity, and can not generate high quality, high-frequency light
The technical issues of pulse.
In order to solve the above technical problems, The technical solution adopted by the invention is as follows:
Based on the Gao Zhongying Harmonic mode-locked fiber laser of external continuous light injection, by laser pumping source, wavelength division multiplexer,
Optoisolator, continuous radiant, photo-coupler, saturable absorber and gain fibre composition；The laser pumping source is connected to
The pumping input terminal of wavelength division multiplexer accesses light with the continuous radiant after wavelength division multiplexer connection optoisolator jointly
Coupler, photo-coupler include that a laser signal output end and a signal connect output end, and the signal connects output end
It is sequentially connected the saturable absorber and gain fibre, gain fibre is connect with wavelength division multiplexer again, constitutes closed loop
Optical resonator；The fibre core of the gain fibre is doped with light emitting ionic.
Preferably, the laser pumping source is semiconductor laser, solid state laser, optical fiber laser or raman laser
Device, the laser pumping source exports the central wavelength of laser as λ, and 500nm≤λ≤2000nm.
Preferably, the light emitting ionic is Er3+、Yb3+、Tm3+、Gd3+、Tb3+、Dy3+、Ho3+Or Lu3+Middle one or two
Above composition.
Preferably, the wavelength division multiplexer is polarization-maintaining type or non-polarization-maintaining type wavelength division multiplexer；The gain fibre is polarization-maintaining
Type or non-polarization-maintaining type gain fibre.
Preferably, the saturable absorber is semiconductor saturable absorbing mirror.
Preferably, the saturable absorber is carbon nanotube, the polymer of graphene, graphene oxide, graphene, opens up
Flutter one of insulator, black phosphorus, molybdenum disulfide or two tungsten selenides two-dimensional material.
Preferably, the saturable absorber is nonlinear polarization rotation, properties in nonlinear optical loop mirror or nonlinear amplification
The equivalent saturable absorber structure of one of annular mirror.
Preferably, the continuous radiant is the continuous radiant of narrow linewidth
In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are: the configuration of the present invention is simple, at
This is low, and by the structure of continuous radiant combination passive mode-locking fiber laser, realizes the harmonic wave of Superhigh repetition rate
Mode locking, and the light pulse of output is made to have the advantages that repetition rate height (GHz), pulse width are narrow (femtosecond, picosecond).
Detailed description of the invention
Fig. 1 is that the present invention is based on the structural schematic diagrams of the Gao Zhongying Harmonic mode-locked fiber laser of external continuous light injection.
Fig. 2 is that the present invention is based on the output lights that the Gao Zhongying Harmonic mode-locked fiber laser of external continuous light injection generates
Pulse temporal figure.
Fig. 3 is that the present invention is based on the output lights that the Gao Zhongying Harmonic mode-locked fiber laser of external continuous light injection generates
Light frequency spectrogram.
Marked in the figure: 1, laser pumping source；2, wavelength division multiplexer；3, optoisolator；4, continuous radiant；5, optical coupling
Device；6, saturable absorber；7, gain fibre.
Specific embodiment
The present invention will be further described below with reference to the drawings.Embodiments of the present invention include but is not limited to following reality
Apply example.
Gao Zhongying Harmonic mode-locked fiber laser based on external continuous light injection as shown in Figure 1, by laser pumping source
1, wavelength division multiplexer 2, optoisolator 3, continuous radiant 4, photo-coupler 5, saturable absorber 6 and gain fibre 7 form；Institute
State the pumping input terminal that laser pumping source 1 is connected to wavelength division multiplexer 2, the wavelength division multiplexer 2 connect after optoisolator 3 with institute
Continuous radiant 4 access photo-coupler 5 jointly is stated, photo-coupler 5 includes a laser signal output end and a signal connection
Output end, signal connection output end are sequentially connected the saturable absorber 6 and gain fibre 7, gain fibre 7 again with wave
Division multiplexer 2 connects, and constitutes the optical resonator of closed loop；The fibre core of the gain fibre 7 is doped with light emitting ionic.
The laser pumping source 1 be semiconductor laser, solid state laser, optical fiber laser or Ramar laser, it is described
Laser pumping source 1 exports the central wavelength of laser as λ, and 500nm≤λ≤2000nm.
The light emitting ionic is Er3+、Yb3+、Tm3+、Gd3+、Tb3+、Dy3+、Ho3+Or Lu3+The group of middle one or more
Close object.
The wavelength division multiplexer 2 is polarization-maintaining type or non-polarization-maintaining type wavelength division multiplexer；The gain fibre 7 is polarization-maintaining type or non-
Polarization-maintaining type gain fibre.
The saturable absorber 6 is semiconductor saturable absorbing mirror.
The saturable absorber 6 is carbon nanotube, graphene, graphene oxide, the polymer of graphene, topology insulation
One of body, black phosphorus, molybdenum disulfide or two tungsten selenides two-dimensional material.
The saturable absorber 6 is nonlinear polarization rotation, properties in nonlinear optical loop mirror or nonlinear amplified loop mirror
One of equivalent saturable absorber structure.
The continuous radiant 4 is the continuous radiant of narrow linewidth.
The present embodiment wavelength division multiplexer 2, polarization relationship type optoisolator 3, photo-coupler 5, saturable absorber 6 and gain
Optical fiber 7 forms closed loop and constitutes optical resonator, and the harmonic lock of Superhigh repetition rate is realized using external continuous radiant 4
Mould, exports the light pulse with high repetition frequency, and the frequency of the Gao Zhongying harmonic wave of the light pulse is greater than 1Ghz.
Specific embodiment
The laser pumping source 1 of the present embodiment uses the single mode semiconductor laser of 793nm；Wavelength division multiplexer 2 is polarization-maintaining type
Wavelength division multiplexer；Optoisolator 3 uses polarization relationship type optoisolator；Continuous 4 output wavelength of radiant swashs close to modelocked fiber
Light device central wavelength；The input terminal of photo-coupler 5 is 50:50, output end 90:10, wherein 10 output ends are that laser signal is defeated
Outlet, 90 output ends connect resonant cavity subsequent parts；Saturable absorber 6 is semiconductor saturable absorbing mirror；Gain fibre 7 is
Doped with Er3+ polarization-maintaining type gain fibre.
As shown in Figure 1-Figure 3, before mode locked fiber laser reaches mode-lock status, connected by the standard that laser itself generates
The continuous optical signal of continuous optical signal and continuous radiant 4 is formed equally spaced multiple under the action of modulating unstable on frequency domain
Longitudinal mode, longitudinal mode spacing are the frequency detuning of external continuous light, are in the present embodiment 25GHz, so that laser be made to generate
Quasi-continuous light is divided into the weak pulse punching of 40ps between being changed into, these pulses are after a period of time, in intracavitary optical fiber and saturable absorption
Under the action of body, the orphan of pulsewidth ultra-narrow is gradually formed, to obtain the harmonic mode locking state that repetition rate is 25GHz.Observation
The output pulse temporal arrived is as shown in Fig. 2, optical frequency figure is shown in Fig. 3.After pulse stabilization, cancel external continuous light letter
Number input, still available stable harmonic mode locking pulsed laser output.
It is as described above the embodiment of the present invention.Design parameter in above-described embodiment and embodiment is merely to clear
The invention verification process of inventor, the scope of patent protection being not intended to limit the invention, patent protection of the invention are stated by Chu
Range is still subject to the claims, all to become with equivalent structure made by specification and accompanying drawing content of the invention
Change, similarly should be included within the scope of the present invention.
Claims (8)
1. the Gao Zhongying Harmonic mode-locked fiber laser based on external continuous light injection, it is characterised in that: by laser pumping source
(1), wavelength division multiplexer (2), optoisolator (3), continuous radiant (4), photo-coupler (5), saturable absorber (6) and gain
Optical fiber (7) composition；The laser pumping source (1) is connected to the pumping input terminal of wavelength division multiplexer (2), the wavelength division multiplexer
(2) connection optoisolator (3) accesses photo-coupler (5) jointly with the continuous radiant (4) afterwards, and photo-coupler (5) includes one
A laser signal output end and a signal connect output end, and the signal connection output end is sequentially connected the saturable absorption
Body (6) and gain fibre (7), gain fibre (7) are connect with wavelength division multiplexer (2) again, constitute the optical resonator of closed loop；
The fibre core of the gain fibre (7) is doped with light emitting ionic；Its working principle is that: reach mode-lock status in mode locked fiber laser
Before, the continuous optical signal of the quasi-continuous optical signal and continuous radiant (4) that are generated by laser itself the work unstable in modulation
Under, equally spaced multiple longitudinal modes are formed on frequency domain, longitudinal mode spacing is the frequency detuning of external continuous light, to make laser
The quasi-continuous light that device generates is divided into the weak pulse punching of the frequency detuning of external continuous light between being changed into, when these pulses pass through one section
Between, under the action of intracavitary optical fiber and saturable absorber, the orphan of pulsewidth ultra-narrow is gradually formed, so that it is steady to obtain repetition rate
Fixed harmonic mode locking state cancels external continuous optical signal input, still available stable harmonic wave after pulse stabilization
Mode-locked laser pulse output.
2. the Gao Zhongying Harmonic mode-locked fiber laser according to claim 1 based on external continuous light injection, feature
Be: the laser pumping source (1) be semiconductor laser, solid state laser, optical fiber laser or Ramar laser, it is described
Laser pumping source (1) exports the central wavelength of laser as λ, and 500nm≤λ≤2000nm.
3. the Gao Zhongying Harmonic mode-locked fiber laser according to claim 1 based on external continuous light injection, feature
Be: the light emitting ionic is Er3+、Yb3+、Tm3+、Gd3+、Tb3+、Dy3+、Ho3+Or Lu3+Middle a combination of one or more
Object.
4. the Gao Zhongying Harmonic mode-locked fiber laser according to claim 1 based on external continuous light injection, feature
Be: the wavelength division multiplexer (2) is polarization-maintaining type or non-polarization-maintaining type wavelength division multiplexer；The gain fibre (7) be polarization-maintaining type or
Non- polarization-maintaining type gain fibre.
5. the Gao Zhongying Harmonic mode-locked fiber laser according to claim 1 based on external continuous light injection, feature
Be: the saturable absorber (6) is semiconductor saturable absorbing mirror.
6. the Gao Zhongying Harmonic mode-locked fiber laser according to claim 1 based on external continuous light injection, feature
Be: the saturable absorber (6) is carbon nanotube, graphene, graphene oxide, the polymer of graphene, topology insulation
One of body, black phosphorus, molybdenum disulfide or two tungsten selenides two-dimensional material.
7. the Gao Zhongying Harmonic mode-locked fiber laser according to claim 1 based on external continuous light injection, feature
Be: the saturable absorber (6) is nonlinear polarization rotation, properties in nonlinear optical loop mirror or nonlinear amplified loop mirror
One of equivalent saturable absorber structure.
8. the Gao Zhongying Harmonic mode-locked fiber laser according to claim 1 based on external continuous light injection, feature
Be: the continuous radiant (4) is the continuous radiant of narrow linewidth.
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| CN108155556A (en) * | 2017-12-25 | 2018-06-12 | 浙江大学 | A kind of passive mode-locking device of saturated absorbing body formula light and preparation method thereof |
| CN109004502B (en) * | 2018-08-07 | 2020-05-22 | 吉林大学 | High-stability multi-soliton generation system based on two-dimensional material saturable absorber |
| CN110187587B (en) * | 2019-06-06 | 2021-02-02 | 电子科技大学 | Light quantization device and method based on NPR (neutral particle size distribution) equivalent saturable absorber |
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