CN109586154A - Pulse condition tunable laser based on three-dimensional dirac semimetal saturable absorber - Google Patents
Pulse condition tunable laser based on three-dimensional dirac semimetal saturable absorber Download PDFInfo
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- CN109586154A CN109586154A CN201910016739.4A CN201910016739A CN109586154A CN 109586154 A CN109586154 A CN 109586154A CN 201910016739 A CN201910016739 A CN 201910016739A CN 109586154 A CN109586154 A CN 109586154A
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- saturable absorber
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- dimensional dirac
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- 239000006096 absorbing agent Substances 0.000 title claims abstract description 78
- 239000000835 fiber Substances 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 12
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 claims description 10
- 238000012544 monitoring process Methods 0.000 claims description 10
- 229910001218 Gallium arsenide Inorganic materials 0.000 claims description 8
- 230000003287 optical effect Effects 0.000 claims description 7
- 239000000758 substrate Substances 0.000 claims description 7
- YPQJHZKJHIBJAP-UHFFFAOYSA-N [K].[Bi] Chemical compound [K].[Bi] YPQJHZKJHIBJAP-UHFFFAOYSA-N 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 4
- KTOVCXQBZPMZGM-UHFFFAOYSA-N bismuth rubidium Chemical compound [Rb].[Bi] KTOVCXQBZPMZGM-UHFFFAOYSA-N 0.000 claims description 4
- FSAJRXGMUISOIW-UHFFFAOYSA-N bismuth sodium Chemical compound [Na].[Bi] FSAJRXGMUISOIW-UHFFFAOYSA-N 0.000 claims description 4
- 239000010445 mica Substances 0.000 claims description 4
- 229910052618 mica group Inorganic materials 0.000 claims description 4
- 229910052691 Erbium Inorganic materials 0.000 claims description 3
- 229910052689 Holmium Inorganic materials 0.000 claims description 3
- 229910052775 Thulium Inorganic materials 0.000 claims description 3
- 229910052769 Ytterbium Inorganic materials 0.000 claims description 3
- APAWRDGVSNYWSL-UHFFFAOYSA-N arsenic cadmium Chemical compound [As].[Cd] APAWRDGVSNYWSL-UHFFFAOYSA-N 0.000 claims description 3
- 230000005684 electric field Effects 0.000 claims description 3
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 claims description 3
- KJZYNXUDTRRSPN-UHFFFAOYSA-N holmium atom Chemical compound [Ho] KJZYNXUDTRRSPN-UHFFFAOYSA-N 0.000 claims description 3
- FRNOGLGSGLTDKL-UHFFFAOYSA-N thulium atom Chemical compound [Tm] FRNOGLGSGLTDKL-UHFFFAOYSA-N 0.000 claims description 3
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 claims description 3
- FTWRSWRBSVXQPI-UHFFFAOYSA-N alumanylidynearsane;gallanylidynearsane Chemical compound [As]#[Al].[As]#[Ga] FTWRSWRBSVXQPI-UHFFFAOYSA-N 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 description 9
- 238000005086 pumping Methods 0.000 description 9
- FSIONULHYUVFFA-UHFFFAOYSA-N cadmium arsenide Chemical compound [Cd].[Cd]=[As].[Cd]=[As] FSIONULHYUVFFA-UHFFFAOYSA-N 0.000 description 7
- 239000013307 optical fiber Substances 0.000 description 6
- 238000002310 reflectometry Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
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- 241000931526 Acer campestre Species 0.000 description 2
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- 229910052785 arsenic Inorganic materials 0.000 description 2
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
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Classifications
-
- 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
-
- 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
Abstract
Based on the pulse condition tunable laser of three-dimensional dirac semimetal saturable absorber, including parameter can active control three-dimensional dirac semimetal saturable absorber, laser resonator and Real-time Feedback adjustment circuit module；Laser resonance is intracavitary, parameter can active control three-dimensional dirac semimetal saturable absorber directly decide laser output pulse characteristic, under the auxiliary of Real-time Feedback adjustment circuit module, itself saturable absorber parameter is adjusted in real time, ensure that laser has excellent starting performance and pulse stability, realize the adjusting of mode locking pulse output pulse width, the flexible switching even between mode locking pulse and Q impulse；The parameter can active control three-dimensional dirac semimetal saturable absorber have two kinds of forms of reflection-type and transmission-type；Under the auxiliary of Real-time Feedback adjustment circuit module, itself nonlinear parameter is adjusted in real time.
Description
Technical field
The present invention relates to a kind of pulse condition adjustable optic fibre laser, which mainly passes through Real-time Feedback and regulates and controls resonance
The nonlinear parameter of intracavitary three-dimensional dirac semimetal saturable absorber is realized, field of laser device technology is belonged to.
Background technique
The features such as pulse laser is high, compact-sized, operability is good because of its peak power, make its processing, optic communication,
Biomedical, scientific research and military field have very big application prospect.It adjusts Q and mode locking is to realize that pulse laser exports
Two kinds of major techniques.Q-switched pulse laser output state is directly related with pump power, and repetition rate is in~kHz magnitude, pulse
Width is mainly reflected in mark, industry cutting and military affairs in~ns magnitude, single pulse energy with higher, application range
Guidance etc.；The output repetition rate of Mode-locked laser device depends on cavity length, in~MHz magnitude, exports arteries and veins
Narrower width is rushed, in ps or fs magnitude, with high peak power, while corresponding fuel factor is smaller, therefore especially suitable
Conjunction apply industrial Precision Machining, biomedicine and in terms of.
The key element that saturable absorption device is generated as pulse laser can be separately to that Q and mode locking pulse is adjusted to swash
In light device, nonlinear parameter plays the role of the starting of laser and final working condition conclusive.It is reported according to having
Road, Q-switched laser is typically chosen the saturable absorption device that carrier recovery time is long, modulation depth is small, and mode locking pulse swashs
The saturable absorption device big using carrier recovery time short (< ps), modulation depth is more likely in light device.It has been reported
Show that the modulation depth of saturable absorption device has a fixing to the auto-startup characteristic and pulse stability of mode-locked laser
It rings, biggish modulation depth can not only reduce the self-starting time of mode locking pulse, but also the success rate of self-starting can be improved
And pulse stability, avoid the generation of wild effect in mode-locked laser work.In addition, appropriate adjustment saturable absorber
Modulation depth, the output pulse width of laser can also be finely adjusted, so that laser is more flexible.
Three-dimensional dirac semimetal since the conduction band and valence band of its energy band are in dirac point contact, and three-momentum sky
Between in show linear dispersion relationship, the three dimensional form of graphene or the topological semimetal state without energy gap can be regarded as, because
This, theoretically its light abstraction width can cross over entire mid-infrared light spectral limit.Saturable absorption device tool based on the material
Have wide operating spectral range, stable structure, can the advantages such as high quality of production.
Existing technical deficiency is, as every profession and trade is continuously increased pulse laser demand, also to pulse laser
Performance and adaptability put forward higher requirements, for the pulse laser currently based on saturable absorption device, by
In the uncontrollability of saturable absorption device nonlinear parameter itself, cause laser in auto-startup characteristic and output pulse width etc.
The adjustment space of aspect is minimum, limits the application range of pulse laser.
Summary of the invention:
The technical problem to be solved in the present invention is to provide a kind of pulse condition adjustable optic fibre lasers.The present invention is based on non-thread
Property parameter can active control three-dimensional dirac semimetal saturable absorber and pulse Real-time Feedback adjustment circuit module,
Under the action of active control source, changes the nonlinear parameter of three-dimensional dirac semimetal saturable absorber, not only can be improved
The self-starting performance of pulse laser, and output pulse width can be regulated and controled, even between realization mode locking and Q impulse
Flexibly switching, so that Optical Maser System reliability with higher and better adaptability.
Realize the solution of the object of the invention technology are as follows: a kind of based on three-dimensional dirac semimetal saturable absorber
Pulse condition tunable laser, including parameter can active control three-dimensional dirac semimetal saturable absorber, laser resonance
Chamber and Real-time Feedback adjustment circuit module；Laser resonance is intracavitary, parameter can the three-dimensional dirac semimetal of active control can satisfy
The pulse characteristic that directly decide laser output with absorber is adjusted in real time under the auxiliary of Real-time Feedback adjustment circuit module
Itself whole saturable absorber parameter not only may insure that laser has excellent starting performance and pulse stability, and
And the adjusting of mode locking pulse output pulse width may be implemented, the flexible switching even between mode locking pulse and Q impulse.Described
Three-dimensional dirac semimetal saturable absorber mainly includes Cadmium arsenide (Cd3As2) and bismuth sodium (Na3Bi), bismuth potassium
(K3Bi) and the saturable absorber that is formed of the materials such as bismuth rubidium (Rb3Bi).
The parameter can active control three-dimensional dirac semimetal saturable absorber have reflection-type and transmission-type
Two kinds of forms；Reflective type device is made of reflection type three-dimensional dirac semimetal saturable absorber, and transmissive type devices are by transmiting
Formula three-dimensional dirac semimetal saturable absorber is constituted.
The reflection type three-dimensional dirac semimetal saturable absorber includes by the three-dimensional dirac of specific thicknesses half
Metal material grows or is transferred on the substrate of service band performance total reflection characteristic, which can be golden mirror or arsenic
The distributed bragg reflector mirror (DBR) of gallium/aluminum gallium arsenide (GaAs/Al0.9GaAs) cyclical growth；
The transmission-type three-dimensional dirac semimetal saturable absorber includes by the three-dimensional dirac of specific thicknesses half
Metal material grows or is transferred on the substrate that service band shows as high transmission characteristic, which can be mica material
Or GaAs (GaAs) material；
The three-dimensional dirac semimetal saturable absorber, including Cadmium arsenide (Cd3As2) and bismuth sodium (Na3Bi),
The saturable absorber that the materials such as bismuth potassium (K3Bi) and bismuth rubidium (Rb3Bi) are formed.
The parameter can the three-dimensional dirac semimetal saturable absorber of active control controlled by active control source
The nonlinear parameter of three-dimensional dirac semimetal saturable absorber realizes, active control source can be temperature, extra electric field or
Both persons coexist.
The laser resonator includes ring resonator and linear resonant cavity.
Active fiber includes mixing ytterbium (Yb), erbium (Er), thulium (Tm) or holmium (Ho) ion respectively in the laser resonator
Gain fibre.
The Real-time Feedback adjustment circuit module includes target input window and monitoring feedback function module.
The target input window can preset the three-dimensional dirac semimetal saturable absorption of laser operation phase
The nonlinear parameter of device for optimizing laser self-starting and stability characteristic, while being used for the fine tuning of output pulse width,
Even for adjusting the switching between Q and mode locking pulse.
The monitoring feedback function module can note down in real time, analyze optical signal, note down laser runing time and
Analyze the basic parameters such as laser repetition rate.
The monitoring feedback function module can in real time according to default active control source and nonlinear parameter corresponding relationship,
Adjustment active control source parameter in real time.
By the nonlinear parameter of active control source active control three-dimensional dirac semimetal saturable absorber, actively control
Source processed can be temperature, extra electric field or both and coexist.
Laser resonator can be ring resonator, be also possible to linear resonant cavity.
Active fiber in laser resonator can be the gain for mixing ytterbium (Yb), erbium (Er), thulium (Tm) or holmium (Ho) ion
Optical fiber.
Real-time Feedback adjustment circuit module includes target input window and monitoring feedback function module.
Target input window can preset the non-of the three-dimensional dirac semimetal saturable absorber of laser different moments
Linear dimensions for optimizing laser self-starting and stability characteristic, while being used for the fine tuning of output pulse width, or even uses
Switching between tune Q and mode locking pulse.
Monitoring feedback function module can be noted down in real time, analyze optical signal, record laser repetition rate, runing time etc.
Basic parameter.
Monitoring feedback function module can adjust in real time in real time according to default active control source and nonlinear parameter corresponding relationship
Whole active control source parameter.
The utility model has the advantages that the present invention is based on nonlinear parameter can active control three-dimensional dirac semimetal saturable absorption
Device adjusts three-dimensional dirac semimetal saturable under the collective effect of active control source and Real-time Feedback adjustment circuit module
Absorber improves self-starting performance (such as the high modulation of pulse laser in the nonlinear parameter of laser different operation phase
Depth can promote the self-starting performance of pulse laser with the self-starting time of chopped pulse laser), and may be implemented defeated
Regulation of the pulse width on the order of magnitude out, the even flexible switching between realization mode locking and Q impulse, so that the laser
System reliability with higher and better adaptability.Parameter of the present invention can active control three-dimensional dirac half
Metal saturable absorber can be different according to laser working stage, under the auxiliary of Real-time Feedback adjustment circuit module,
Itself nonlinear parameter is adjusted in real time, guarantees laser excellent auto-startup characteristic and pulse stability.So that the pulse swashs
Light device system adapts to different application demands.
Detailed description of the invention
Fig. 1 is under the action of controller (4), between the nonlinear parameter and control signal of Cadmium arsenide's saturable absorber
Corresponding relationship.The wherein relationship of the absorptivity of (a) figure Cadmium arsenide saturable absorber material and pumping flux, (b) figure is arsenic
The temperature of cadmium saturable absorber and the relationship of modulation depth.
Fig. 2 is a kind of pulse condition tunable laser based on three-dimensional dirac semimetal saturable absorber in example 1
Structural schematic diagram.
Fig. 3 is a kind of pulse condition tunable laser based on three-dimensional dirac semimetal saturable absorber in example 2
Structural schematic diagram.
Fig. 4 is a kind of pulse condition tunable laser based on three-dimensional dirac semimetal saturable absorber in example 3
Structural schematic diagram.
Fig. 5 is a kind of pulse condition tunable laser based on three-dimensional dirac semimetal saturable absorber in example 4
Structural schematic diagram.
Marked in the figure: 1, three-dimensional dirac semimetal saturable absorber, 2, aspherical mirror, 3, collimation lens, 4, control
Device, 5, Real-time Feedback adjustment circuit module, 6, pump laser, 7, wavelength division multiplexer, 8, gain fibre, 9, isolator, 10, small
Output is than coupler, and 11, big output is than coupler, 12, active control source module, 13, circulator, 14, antiradar reflectivity optical fiber light
Grid, 15, high reflectance fiber grating
Specific embodiment
Present invention is further described in detail with reference to the accompanying drawing.
High reliability, high-adaptability pulse optical fiber, wherein three-dimensional dirac semimetal saturable absorber (1) is selected
Cadmium arsenide's film of molecular beam epitaxial growth is selected, with a thickness of 30nm, corresponding relationship such as Fig. 1 of nonlinear parameter and control signal
Shown, with the increase for applying temperature or electric current, apparent variation occurs for modulation depth, and temperature increases to 336K by 297K
Or during electric current increases to 50mA by 0mA, modulation depth gradually can increase to 75% by 33%, so apparent to become
Change, provides wide space for the adjustment of post laser device state.In order to guarantee the reliability of Optical Maser System, in laser
It is startup stage, appropriate to increase temperature or increase current strength to improve the modulation depth of Cadmium arsenide's saturable absorber, Ke Yiyou
Change the self-starting effect of pulse laser, reduces pulse-on times, this is with the obvious advantage for mode locking pulse；Then, swashing
The light device continuous work stage, then suitably reduce the temperature or current strength being applied on Cadmium arsenide's saturable absorber, it reduces and swashs
Insertion Loss in optical cavity, it is ensured that the stability of laser output pulse.On the other hand, in order to adapt to different application demands, pass through tune
Whole temperature or current strength adjust the modulation depth of Cadmium arsenide's saturable absorber, can be to the output pulse width of laser
It is finely adjusted, at the same time, if modulation depth reduces to a certain extent, the conversion of mode locking pulse to Q impulse may be implemented.
Specific embodiment 1: a kind of pulse condition tunable laser based on three-dimensional dirac semimetal saturable absorber,
Structure is as shown in Figure 2.Three-dimensional dirac semimetal saturable absorber (1) is transmission-type, by three-dimensional dirac semi-metallic
It is constituted with the mica substrate for showing as basic full impregnated under service band, constitutes active control module (12) with controller (4).Aspheric
Face lens (2) and collimator (3) form fiber coupling system, complete optical fiber-space-optical fiber conversion.Pumping source (6) is partly to lead
Pump light is injected into gain fibre (8), provides enough gains for laser by body pumping source by wavelength division multiplexer (7).
Gain fibre (8) connects fibre optic isolater (9) afterwards, guarantees laser unidirectional operation, forms effective laser output.Isolator (9)
The small output of other end connection it is intracavitary to guarantee that a part of laser returns to, another is defeated than one of output end of coupler (10)
Outlet is exported as laser, is connected to input terminal of the big output than coupler (11), large scale output port as laser most
Output, small scale output port are connected in Real-time Feedback adjustment circuit module (5) as monitoring side eventually, not only can be to defeated
Laser pulse situation and runing time be into accurate recording out, and can according to the state parameter that pre-enters with receive
Comparing result between signal, is handed down to controller (4) by Serial Port Line and orders accordingly, adjusts three-dimensional half gold of dirac in real time
A closed loop feedback is integrally formed in the nonlinear parameter for belonging to saturable absorber (1), guarantees laser according to set objective work
Make.
It is referred to the CN105490146 file of the present inventor's group.Three-dimensional dirac semi-metallic, including Cadmium arsenide
(3 As 2 of Cd) and bismuth sodium (3 Bi of Na), bismuth potassium (3 Bi of K) and bismuth rubidium (3 Bi of Rb) etc., absorber thickness is 1-
1000 nanometers.The three-dimensional dirac semi-metallic of this thickness is grown or is transferred to and shows as high transmission spy in service band
Property substrate on, which can be mica material or GaAs (GaAs) material, and in other embodiments.
Specific embodiment 2: a kind of pulse condition tunable laser based on three-dimensional dirac semimetal saturable absorber,
Structure is as shown in Figure 3.Overall system structure is similar to Example 1, the difference is that three-dimensional dirac half in laser ring cavity
Metal saturable absorber (1) be it is reflective, by show as being all-trans under three-dimensional dirac semi-metallic and service band
The distributed bragg reflector mirror of GaAs/Al0.9GaAs periodic structure is constituted, and thus brings the specific variation of laser such as
Under:
Three-dimensional dirac semimetal saturable absorber (1) be it is reflective, with collimator (3) and non-spherical lens (2)
Cooperation forms fiber coupling saturable absorber.The second port of tail optical fiber connection circulator (13) of collimator (2).Circulator
(13) signal end of first port connection wavelength division multiplexer (7).The pumping end of wavelength division multiplexer (7) connects respectively with output port
Connect pumping source (6) and gain fibre (8).The small output of other end connection of gain fibre (8) is more defeated than one of coupler (10)
Exit port is for providing enough gains of light.Third end of the small output than input port connection circulator (13) of coupler (10)
Mouthful, since circulator (13) is directionality device, it ensure that laser pulse unidirectional operation.
Specific embodiment 3: a kind of pulse condition tunable laser based on three-dimensional dirac semimetal saturable absorber,
Structure is as shown in Figure 4.Overall system structure is similar to Example 1, the difference is that laser resonator is linear cavity, thus band
Specific variation to laser is as follows:
The pumping end of wavelength division multiplexer (7), signal end, output end are separately connected pumping source (6), antiradar reflectivity fiber grating
(14) and gain fibre (8).The other end connection of gain fibre (8) is by collimator (3), non-spherical lens (2) and transmission
The transmission-type saturated absorbing body that formula three-dimensional dirac semimetal saturable absorber (1) is constituted.Other side collimator (3) is connected to
High reflectance fiber grating (15) forms resonant cavity.The other end of antiradar reflectivity fiber grating (14) is as output port, even
It is connected to input terminal of the big output than coupler (11), feedback signal and the output of last laser are provided.
Specific embodiment 4: a kind of pulse condition tunable laser based on three-dimensional dirac semimetal saturable absorber,
Structure is as shown in Figure 5.Overall system structure is similar to Example 1, the difference is that laser resonator is linear cavity and three
Tie up dirac semimetal saturable absorber (1) be it is reflective, thus bring laser it is specific change it is as follows:
The pumping end of wavelength division multiplexer (7), signal end, output end are separately connected pumping source (6), antiradar reflectivity fiber grating
(14) and gain fibre (8).The other end connection of gain fibre (8) is by collimator (3), non-spherical lens (2) and reflection
The reflective saturated absorbing body that formula three-dimensional dirac semimetal saturable absorber (1) is constituted.Half gold of reflection type three-dimensional dirac
Belong to saturable absorber (1) as an end mirror and antiradar reflectivity fiber grating (14) and forms resonant cavity.Antiradar reflectivity optical fiber light
The other end of grid (14) is connected to input terminal of the big output than coupler (11) as output port, provide feedback signal with
And last laser output.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (9)
1. a kind of pulse condition tunable laser based on three-dimensional dirac semimetal saturable absorber, it is characterised in that: packet
Include parameter can active control three-dimensional dirac semimetal saturable absorber, laser resonator and Real-time Feedback adjustment circuit
Module；Laser resonance is intracavitary, parameter can the three-dimensional dirac semimetal saturable absorber of active control directly decide laser
The pulse characteristic of device output adjusts itself saturable absorber parameter under the auxiliary of Real-time Feedback adjustment circuit module in real time,
Ensure that laser has excellent starting performance and pulse stability, realizes the adjusting of mode locking pulse output pulse width, even
Flexible switching between mode locking pulse and Q impulse；
The parameter can active control three-dimensional dirac semimetal saturable absorber have reflection-type and two kinds of transmission-type
Form；Reflective type device is made of reflection type three-dimensional dirac semimetal saturable absorber, and transmissive type devices are by transmission-type three
Dirac semimetal saturable absorber is tieed up to constitute.
2. the pulse condition tunable laser as described in claim 1 based on three-dimensional dirac semimetal saturable absorber,
It is characterized by:
The parameter can active control three-dimensional dirac semimetal saturable absorber it is three-dimensional by the control of active control source
The nonlinear parameter of dirac semimetal saturable absorber realizes that active control source is that temperature, extra electric field or both are total
It deposits.
3. the pulse condition tunable laser as described in claim 1 based on three-dimensional dirac semimetal saturable absorber,
It is characterized by: the laser resonator includes ring resonator and linear resonant cavity.
4. a kind of pulse condition adjustable laser based on three-dimensional dirac semimetal saturable absorber as described in claim 1
Device, it is characterised in that: Active fiber includes mixing ytterbium (Yb), erbium (Er), thulium (Tm) or holmium respectively in the laser resonator
(Ho) gain fibre of ion.
5. the pulse condition based on three-dimensional dirac semimetal saturable absorber as described in one of claim 1-4 is adjustable sharp
Light device, it is characterised in that: the Real-time Feedback adjustment circuit module includes target input window and monitoring feedback function mould
Block.
6. the pulse condition based on three-dimensional dirac semimetal saturable absorber as described in one of claim 1-4 is adjustable sharp
Light device, it is characterised in that: the three-dimensional dirac semimetal that the target input window can preset the laser operation phase can
The nonlinear parameter of saturable absorber, for optimizing laser self-starting and stability characteristic, and meanwhile it is wide for exporting pulse
The fine tuning of degree, or even for adjusting the switching between Q and mode locking pulse.
7. the pulse condition based on three-dimensional dirac semimetal saturable absorber as described in one of claim 1-4 is adjustable sharp
Light device, it is characterised in that: the reflection type three-dimensional dirac semimetal saturable absorber includes by the three-dimensional of specific thicknesses
Dirac semi-metallic grow or be transferred to service band performance total reflection characteristic substrate on, the substrate be golden mirror or
Arsenic gallium/aluminum gallium arsenide (GaAs/Al0.9GaAs) cyclical growth distributed bragg reflector mirror (DBR)；
The transmission-type three-dimensional dirac semimetal saturable absorber includes by the three-dimensional dirac semimetal of specific thicknesses
Material growth is transferred on the substrate that service band shows as high transmission characteristic, which is mica material or arsenic
Gallium (GaAs) material；The three-dimensional dirac semimetal saturable absorber, including Cadmium arsenide (Cd3As2) and bismuth sodium
(Na3Bi), the saturable absorber that the materials such as bismuth potassium (K3Bi) and bismuth rubidium (Rb3Bi) are formed.
8. the pulse condition based on three-dimensional dirac semimetal saturable absorber as described in one of claim 1-4 is adjustable sharp
Light device, it is characterised in that the monitoring feedback function module notes down in real time, analyzes optical signal, note down laser runing time with
And analysis laser repetition rate basic parameter.
9. the pulse condition based on three-dimensional dirac semimetal saturable absorber as described in one of claim 1-4 is adjustable sharp
Light device, it is characterised in that: the monitoring feedback function module can be in real time according to default active control source and nonlinear parameter
Corresponding relationship adjusts active control source parameter in real time.
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