CN106877121B - Pulse width tuning laser based on light-operated graphene Chirp Bragg grating - Google Patents
Pulse width tuning laser based on light-operated graphene Chirp Bragg grating Download PDFInfo
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- CN106877121B CN106877121B CN201710255294.6A CN201710255294A CN106877121B CN 106877121 B CN106877121 B CN 106877121B CN 201710255294 A CN201710255294 A CN 201710255294A CN 106877121 B CN106877121 B CN 106877121B
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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
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0057—Temporal shaping, e.g. pulse compression, frequency chirping
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
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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
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- Optics & Photonics (AREA)
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Abstract
The present invention provides a kind of pulse width tuning laser based on light-operated graphene Chirp Bragg grating, wherein second laser is used to carry out light-operated adjusting to the reflection bandwidth of graphene Chirp Bragg grating, the laser of first laser device output is transferred to coupler by wavelength division multiplexer, fraction of laser light is transferred to graphene Chirp Bragg grating by saturable absorber by coupler, laser reflection identical with its reflection bandwidth is transmitted back to wavelength division multiplexer by graphene Chirp Bragg grating, circle transmission is carried out with the laser exported to first laser device, until stablizing output pulse width laser identical with reflection bandwidth from the second output terminal of coupler, during circle transmission, saturable absorber filters out laser identical with reflection bandwidth；Graphene Chirp Bragg grating is made of to superscribe graphene using the Chirp Bragg grating that covering is corroded.By the invention it is possible to improve tuning precision, stability and tuning range, and shorten the response time.
Description
Technical field
The invention belongs to field of lasers, and in particular to a kind of pulsewidth based on light-operated graphene Chirp Bragg grating can
Adjusting laser.
Background technique
Pulse width tuning laser has many advantages, such as that structure is simple, thermal diffusivity is good, high-efficient, now fiber optic communication,
There is highly important effect in the fields such as Fibre Optical Sensor, laser cutting, biologic medical, nonlinear optics.Existing pulse width-tuned hand
Section is broadly divided into following methods: by mechanical device manually or with the filtering in mechanical step-by-step system tuning laser chamber
Device is tuned with the time domain pulsewidth for reaching to the mode locking pulse of output；Pass through electric field controls saturable absorber modulation depth
Pulsewidth is tuned；In addition to this it is realized by the modulation depth of additional Laser Modulation saturable absorber and loss to pulsewidth
Tuning.But mechanical humorous mode is since mechanical step-by-step system precision is lower, the limitation of mechanical device complexity, cause modulation accuracy and
Modulation repeatability is not high, and the response time is longer.Joule heat is released when Electric Field Modulated saturable absorber makes saturable absorber
Thermal damage's threshold value be greatly reduced, modulation voltage can only control in small range, and electric field tuning by its be driven circuit ring
It should influence, the optical modulating device bandwidth of operation of tuning is limited.It can be seen that there is tuning in current pulse width-tuned mode
Precision is lower, stability is poor, range is relatively narrow and response time longer problem.
Summary of the invention
The present invention provides a kind of pulse width tuning laser based on light-operated graphene Bragg grating, to solve current pulsewidth
Tuning precision existing for tuning manner is lower, stability is poor, range is relatively narrow and response time longer problem.
According to a first aspect of the embodiments of the present invention, a kind of pulsewidth based on light-operated graphene Chirp Bragg grating is provided
Tunable laser, including first laser device, second laser, graphene Chirp Bragg grating, wavelength division multiplexer, circulator,
Coupler and saturable absorber, wherein the output end of the first laser device connects the first input of the wavelength division multiplexer
End, the output end of the wavelength division multiplexer connect the input terminal of the coupler, and the first output end of the coupler passes through institute
The first end that saturable absorber connects the circulator is stated, the second end of the circulator connects the graphene chirp Bradley
The first end of lattice grating, third end connect the second input terminal of the wavelength division multiplexer, and the output end of the second laser connects
Connect the second end of the graphene Chirp Bragg grating；
The second laser is used to carry out light-operated adjusting, institute to the reflection bandwidth of the graphene Chirp Bragg grating
The laser for stating first laser device output is transferred to the coupler by the wavelength division multiplexer, and the coupler is by fraction of laser light
It is transferred to the graphene Chirp Bragg grating by the saturable absorber, the graphene Chirp Bragg grating will
Laser reflection identical with its reflection bandwidth is transmitted back to the wavelength division multiplexer, with laser that the first laser device is exported into
Row circle transmission, until stablize output pulse width laser identical with the reflection bandwidth from the second output terminal of the coupler,
During circle transmission, the saturable absorber filters out laser identical with the reflection bandwidth；The graphene Zhou
Bragg grating of singing is made of to superscribe graphene using the Chirp Bragg grating that covering is corroded.
In an optional implementation manner, the second laser is used for the watt level by changing output laser,
To carry out light-operated adjusting to the reflection bandwidth of the graphene Chirp Bragg grating, wherein the power of output laser is bigger, adjust
The reflection bandwidth of graphene Chirp Bragg grating after section is wider.
It further include being arranged between the wavelength division multiplexer and the coupler in another optional implementation
Erbium-doped fiber.
It further include being arranged between the wavelength division multiplexer and the coupler in another optional implementation
Polarization Controller.
It further include being arranged between the wavelength division multiplexer and the coupler in another optional implementation
Isolator.
In another optional implementation, graphene is wrapped up in the graphene Chirp Bragg grating chirp
The length of Bragg grating is 3 to 6 millimeters.
The beneficial effects of the present invention are:
1, Chirp Bragg grating of the present invention by using covering through corroding superscribes graphene and graphene chirp is made
Bragg grating, and be adjusted based on reflection bandwidth of the laser power size to graphene Chirp Bragg grating, Ke Yili
It is changed this characteristic with graphene Chirp Bragg optical grating reflection bandwidth, the output of adjustable pulse width laser is realized, using this
Tuning precision, stability and tuning range can be improved in kind adjustable pulse width mode, and shortens the response time；
2, the present invention carries out gain amplification, setting polarization to the laser of wavelength division multiplexer output by setting erbium-doped fiber
Controller can carry out Polarization Control with laser, and setting isolator is input into capable isolation to laser, may further ensure that output swashs
The stability of light；
3, the present invention is by by the length for the Chirp Bragg grating that graphene is wrapped up in graphene Chirp Bragg grating
Degree is 3 to 6 millimeters, under the premise of realizing pulse-width regulated, can not influence the response time.
Detailed description of the invention
Fig. 1 is that the present invention is based on one embodiment structures of the pulse width tuning laser of light-operated graphene Bragg grating to show
It is intended to；
Fig. 2 is one embodiment diagrammatic cross-section of graphene Chirp Bragg grating of the present invention；
Fig. 3 is that the present invention is based on another example structures of the pulse width tuning laser of light-operated graphene Bragg grating
Schematic diagram.
Specific embodiment
Technical solution in embodiment in order to enable those skilled in the art to better understand the present invention, and make of the invention real
The above objects, features, and advantages for applying example can be more obvious and easy to understand, with reference to the accompanying drawing to technical side in the embodiment of the present invention
Case is described in further detail.
In the description of the present invention, unless otherwise specified and limited, it should be noted that term " connection " should do broad sense reason
Solution, for example, it may be mechanical connection or electrical connection, the connection being also possible to inside two elements can be directly connected, it can also
Indirectly connected through an intermediary, for the ordinary skill in the art, can understand as the case may be above-mentioned
The concrete meaning of term.
Referring to Fig. 1, for the present invention is based on one embodiment of the pulse width tuning laser of light-operated graphene Bragg grating
Structural schematic diagram.The pulse width tuning laser based on light-operated graphene Bragg grating may include first laser device 4, second
Laser 6, graphene Chirp Bragg grating 1, wavelength division multiplexer 3, circulator 5, coupler 9 and saturable absorber 10,
Described in the output end of first laser device 4 connect the first input end of the wavelength division multiplexer 3, the wavelength division multiplexer 3 it is defeated
Outlet connects the input terminal of the coupler 9, and the first output end of the coupler 9 is connected by the saturable absorber 10
The first end of the circulator 5, the second end of the circulator 5 connect the first end of the graphene Chirp Bragg grating 1,
Third end connects the second input terminal of the wavelength division multiplexer 3, and the output end of the second laser 6 connects the graphene Zhou
It sings the second end of Bragg grating 1.
The second laser 6 is used to carry out light-operated adjusting to the reflection bandwidth of the graphene Chirp Bragg grating 1,
The laser that the first laser device 4 exports is transferred to the coupler 9 by the wavelength division multiplexer 3, and the coupler 9 is by portion
Shunt excitation light is transferred to the graphene Chirp Bragg grating 1, the graphene chirp cloth by the saturable absorber 10
Laser reflection identical with its reflection bandwidth is transmitted back to the wavelength division multiplexer 3 by glug grating 1, to the first laser device
The laser of 4 outputs carries out circle transmission, until stablizing output pulse width and the graphene from the second output terminal of the coupler 9
The identical laser of the reflection bandwidth of Chirp Bragg grating 1, during circle transmission, the saturable absorber 10 is filtered out
Laser identical with the reflection bandwidth；Graphene Chirp Bragg grating 1 is the Chirp Bragg light being corroded using covering
Grid 1-2 superscribes graphene 1-1 and is made, as shown in Figure 2.
In the present embodiment, after the pump light that second laser 6 exports is transmitted to graphene Chirp Bragg grating, from fibre
The light field meeting overflowed in core and the graphene being wrapped on Chirp Bragg grating interact.Graphene has zero band gap
Structure so the electronics in graphene valence band is easy to absorb in pumping photon transition to conduction band, and meets dirac distribution,
The electronics distribution that this process can directly result in graphene band structure changes.When changing pump light intensities, graphene
Energy band electron distribution it is also different.The reflection bandwidth of Chirp Bragg grating is determined by fiber core refractive index and period profile
's.Since the fibre core of Chirp Bragg grating has periodically been modulated, it is wrapped in capable of charging for the graphene above fibre core
The variation of son distribution can further result in the change of the refraction index modulation of grating, eventually lead to the bandwidth of optical grating reflection spectrum in this way
It changes.Therefore, the present invention can change the anti-of Chirp Bragg grating by changing the pumping light intensity of regulation graphene
Penetrate bandwidth.At this time when the signal laser that first laser device 4 exports passes sequentially through wavelength division multiplexer 3, coupler 9, saturable absorption
Body 10 enters after graphene Chirp Bragg grating 1, since reflection bandwidth changes, graphene chirped fiber Bragg gratings 1
It will be from the longitudinal mode selected in signal laser in its reflected waveband bandwidth, transmission and reflection echo division multiplexing device 3.By graphene chirp
The laser of 1 transmission and reflection echo division multiplexing device 3 of Bragg grating can carry out circle transmission can during circle transmission
Saturated absorbing body 10 can screen laser identical with the reflection bandwidth of graphene Chirp Bragg grating 1, to guarantee to couple
The second output terminal output pulse width of device 9 laser identical with the reflection bandwidth of graphene Chirp Bragg grating 1.It can be seen that
The present invention can by changing the watt level of output laser, to the reflection bandwidth of the graphene Chirp Bragg grating into
The light-operated adjusting of row, thus realize the adjusting of output laser pulse width, wherein the power of output laser is bigger, the graphene Zhou after adjusting
Sing Bragg grating reflection bandwidth it is wider.
Due to very fast in optical transport rate, the second end for exporting laser to coupler 9 from first laser device 4 stablizes output
Pulsewidth and laser the time it takes of graphene Chirp Bragg grating 1 are very short, therefore when tuning response in the present invention
Between it is shorter, and the adjusting of the reflection bandwidth of graphene Chirp Bragg grating is light-operated adjusting, different from electric field tuning, no
It is driven by it the influence of circuit, therefore tuning precision is higher, tuning range is wider.In addition, the pulsewidth for the laser that the present invention exports
It is only related with the laser power that the performance of graphene Chirp Bragg grating itself and second laser export, and the two is once
Determine is influenced smaller by the external world, thus stability is more preferable.
In addition, the manufacturing process of graphene Bragg grating can be with are as follows:
(1) by the Chirp Bragg grating of commercial C-band, (5 to 10 nanometers of reflection bandwidth, reflection kernel wavelength is received for 1550
Rice, reflectivity are greater than 90%, 12 millimeters of grid region length) it impregnates in a solution of hydrofluoric acid, to the covering of Chirp Bragg grating
Corroded, the diameter of grating is corroded to 12 to 18 microns.
(2) utilize the method for chemistry displacement by copper-based removal commercial copper-based single-layer graphene.
(3) it will remove on copper-based single-layer graphene package to the Chirp Bragg grating after corrosion.
It is to be noted that saturable absorber can use graphene, carbon nanotube, quantum dot or open up in the present embodiment
Insulator is flutterred, first laser device and second laser can be 980nm pump laser, and the first input end of wavelength division multiplexer is
980 nano waveband laser inputs, the second input terminal are 1550 nano waveband laser inputs, first output end of coupler
Splitting ratio with second output terminal is 9:1, the Chirp Bragg grating that graphene is wrapped up in graphene Chirp Bragg grating
Length be 3 to 6 millimeters, thus under the premise of realizing pulse-width regulated, the response time can not be influenced.
As seen from the above-described embodiment, Chirp Bragg grating of the present invention by using covering through corroding superscribes graphene
Be made graphene Chirp Bragg grating, and based on laser power size to the reflection bandwidth of graphene Chirp Bragg grating into
Row is adjusted, and be can use graphene Chirp Bragg optical grating reflection bandwidth and is changed this characteristic, realizes adjustable pulse width laser
Output, tuning precision, stability and tuning range can be improved using this adjustable pulse width mode, and shorten the response time.
Referring to Fig. 3, for the present invention is based on another of the pulse width tuning laser of light-operated graphene Bragg grating implementations
Example structural schematic diagram.The difference of pulse width tuning laser based on light-operated graphene Bragg grating shown in Fig. 3 and Fig. 2 is,
It further include the erbium-doped fiber 2, Polarization Controller 3 and isolator 8 being arranged between the wavelength division multiplexer and the coupler.
In the present embodiment, the output end of wavelength division multiplexer 3 passes sequentially through erbium-doped fiber 2, Polarization Controller 3 and isolator 8
Connect the input terminal of coupler 9.Wherein, erbium-doped fiber 2 can carry out gain amplification to the laser that wavelength division multiplexer 3 exports, partially
The controller 3 that shakes can carry out Polarization Control to the amplified laser of gain, and isolator 8 can be input into capable isolation to laser, mix
The length of erbium optical fiber 2 is 1 meter.
As seen from the above-described embodiment, Chirp Bragg grating of the present invention by using covering through corroding superscribes graphene
Be made graphene Chirp Bragg grating, and based on laser power size to the reflection bandwidth of graphene Chirp Bragg grating into
Row is adjusted, and be can use graphene Chirp Bragg optical grating reflection bandwidth and is changed this characteristic, realizes adjustable pulse width laser
Output, tuning precision, stability and tuning range can be improved using this adjustable pulse width mode, and shorten the response time.
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to of the invention its
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the invention, these modifications, purposes or
Person's adaptive change follows general principle of the invention and including the undocumented common knowledge in the art of the present invention
Or conventional techniques.The description and examples are only to be considered as illustrative, and true scope and spirit of the invention are by following
Claim is pointed out.
It should be understood that the present invention is not limited to the precise structure already described above and shown in the accompanying drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present invention is limited only by the attached claims.
Claims (6)
1. a kind of pulse width tuning laser based on light-operated graphene Chirp Bragg grating, which is characterized in that swash including first
Light device, second laser, graphene Chirp Bragg grating, wavelength division multiplexer, circulator, coupler and saturable absorber,
Wherein the output end of the first laser device connects the first input end of the wavelength division multiplexer, the output of the wavelength division multiplexer
End connects the input terminal of the coupler, and the first output end of the coupler connects the ring by the saturable absorber
The first end of shape device, the second end of the circulator connect the first end of the graphene Chirp Bragg grating, circulator
Third end connects the second input terminal of the wavelength division multiplexer, and the output end of the second laser connects the graphene chirp
The second end of Bragg grating；
The second laser is used to carry out the reflection bandwidth of the graphene Chirp Bragg grating light-operated adjusting, and described the
The laser of one laser output is transferred to the coupler by the wavelength division multiplexer, and the coupler passes through fraction of laser light
The saturable absorber is transferred to the graphene Chirp Bragg grating, and the graphene Chirp Bragg grating will be with it
The identical laser reflection of reflection bandwidth is transmitted back to the wavelength division multiplexer, is followed with the laser exported to the first laser device
Ring transmission is following until stablizing output pulse width laser identical with the reflection bandwidth from the second output terminal of the coupler
In ring transmission process, the saturable absorber filters out laser identical with the reflection bandwidth；The graphene chirp cloth
Glug grating is made of to superscribe graphene using the Chirp Bragg grating that covering is corroded.
2. the pulse width tuning laser according to claim 1 based on light-operated graphene Chirp Bragg grating, feature
It is, the second laser is used for the watt level by changing output laser, to the graphene Chirp Bragg light
The reflection bandwidth of grid carries out light-operated adjusting, wherein the power of output laser is bigger, the graphene Chirp Bragg grating after adjusting
Reflection bandwidth it is wider.
3. the pulse width tuning laser according to claim 1 based on light-operated graphene Chirp Bragg grating, feature
It is, further includes the erbium-doped fiber being arranged between the wavelength division multiplexer and the coupler.
4. the pulse width tuning laser according to claim 1 or 3 based on light-operated graphene Chirp Bragg grating, special
Sign is, further includes the Polarization Controller being arranged between the wavelength division multiplexer and the coupler.
5. the pulse width tuning laser according to claim 4 based on light-operated graphene Chirp Bragg grating, feature
It is, further includes the isolator being arranged between the wavelength division multiplexer and the coupler.
6. the pulse width tuning laser according to claim 1 based on light-operated graphene Chirp Bragg grating, feature
It is, the length for the Chirp Bragg grating that graphene is wrapped up in the graphene Chirp Bragg grating is 3 to 6 millimeters.
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| CN107732639A (en) * | 2017-10-26 | 2018-02-23 | 杨晓艳 | A kind of adjustable mode locked fiber laser and pulse laser production method |
| CN107946889A (en) * | 2017-11-23 | 2018-04-20 | 黑龙江工程学院 | A kind of multiple Pulse Compression solid laser system |
| CN107994455A (en) * | 2017-11-23 | 2018-05-04 | 黑龙江工程学院 | A kind of multichannel end pumping narrow spaces thin slice solid state laser |
| CN108365505B (en) * | 2018-02-02 | 2019-06-18 | 武汉安扬激光技术有限责任公司 | A kind of lossless tandem type pulse stretcher of all -fiber |
| US11233372B2 (en) | 2019-06-25 | 2022-01-25 | Lumentum Operations Llc | Femtosecond pulse stretching fiber oscillator |
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