CN106654833A - Wavelength-tunable narrow linewidth laser based on graphene Bragg grating - Google Patents

Wavelength-tunable narrow linewidth laser based on graphene Bragg grating Download PDF

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Publication number
CN106654833A
CN106654833A CN201710152756.1A CN201710152756A CN106654833A CN 106654833 A CN106654833 A CN 106654833A CN 201710152756 A CN201710152756 A CN 201710152756A CN 106654833 A CN106654833 A CN 106654833A
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CN
China
Prior art keywords
bragg grating
laser
graphene
wavelength
output
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CN201710152756.1A
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Chinese (zh)
Inventor
朱涛
高磊
李雨佳
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重庆大学
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Priority to CN201710152756.1A priority Critical patent/CN106654833A/en
Publication of CN106654833A publication Critical patent/CN106654833A/en

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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01SDEVICES 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
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06Construction or shape of active medium
    • H01S3/063Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067Fibre lasers
    • H01S3/0675Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01SDEVICES 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
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06Construction or shape of active medium
    • H01S3/063Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067Fibre lasers
    • H01S3/06754Fibre amplifiers
    • H01S3/06783Amplifying coupler
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01SDEVICES 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
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10007Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
    • H01S3/10023Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
    • H01S3/1003Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors tunable optical elements, e.g. acousto-optic filters, tunable gratings

Abstract

The invention provides a wavelength-tunable narrow linewidth laser based on a graphene Bragg grating. The wavelength-tunable narrow linewidth laser comprises the graphene Bragg grating, wherein the graphene Bragg grating comprises a fiber core, cladding and a graphene layer which covers the cladding in sequence from inside to outside. The thickness of the cladding is regulated to cover the cladding with the graphene layer, the light intensity of pump light transmitted to the fiber core is regulated to regulate the modulation refractive index of the graphene Bragg grating, the regulation of the central wavelength of the graphene Bragg grating is realized, so that the weave length of a laser signal returned and output by the graphene Bragg grating can be regulated, and the laser signal subjected to wavelength regulation can be subjected to further linewidth cyclic compression on the basis of a Rayleigh optical fiber. Through the laser, the central wavelength of the graphene Bragg grating can be regulated, the accuracy and the response time of the regulation of the central wavelength of the graphene Bragg grating are improved, and in addition, a laser signal with ultra-narrow linewidth can be obtained on the basis of the Rayleigh optical fiber.

Description

Wavelength tunable narrow linewidth laser based on Graphene Bragg grating

Technical field

The invention belongs to field of lasers, and in particular to a kind of Wavelength tunable narrow linewidth based on Graphene Bragg grating Laser instrument.

Background technology

Laser instrument has application widely in fields such as fiber optic communication, accurate light coherent measurement, distributed fiber-optic sensors. Graphene Bragg grating reflection smaller bandwidth easily can be selected single from the multilongitudianl-mode laser for meeting laser starting of oscillation Longitudinal mode, and the back rayleigh scattering effect in optical fiber further can effectively narrow the live width of single longitudinal mode laser.But current Narrow linewidth laser field carries out wavelength tuning control mainly by changing Graphene Prague using Graphene Bragg grating The methods such as the stress and temperature of grating change the effective refractive index of grating, further change the center of Graphene Bragg grating Wavelength.But this kind of method for mechanically or thermally tuning it tuning precision, all can be subject on the tuning response time mechanical stepping away from From and the temperature-responsive time restriction.

The content of the invention

The present invention provides a kind of Wavelength tunable narrow linewidth laser based on Graphene Bragg grating, to solve current ripple Long tunable laser wavelength regulation precision is relatively low and problem of response time length.

A kind of first aspect according to embodiments of the present invention, there is provided the narrow line of the Wavelength tunable based on Graphene Bragg grating Wide laser instrument, including the first pump laser, doped fiber, first annular device and Graphene Bragg grating, wherein the stone Black alkene Bragg grating includes fibre core, covering and is wrapped in the graphene layer of the covering, first pump successively from the inside to the outside The output end of Pu laser instrument passes through the first end that the doped fiber connects the first annular device, and the of the first annular device Two ends connect the fibre core;

By the thickness for adjusting the covering, graphene layer is wrapped up on the covering, and regulation is transferred to the fibre core Pump light light intensity adjusting the refraction index modulation of the Graphene Bragg grating, realize the Graphene Bragg grating The regulation of centre wavelength;After the completion of the Graphene Bragg grating centre wavelength is adjusted, the fibre core is to first ring The a length of laser signal for adjusting rear center's wavelength of second end close echo of shape device, and it is defeated by the 3rd end of the first annular device Go out.

In a kind of optional implementation, also wrapped based on the Wavelength tunable narrow linewidth laser of Graphene Bragg grating The second pump laser and the first wavelength division multiplexer are included, the first input end of first wavelength division multiplexer connects first ring Second end of shape device, the second input connects the output end of second pump laser, and second pump laser is used for By first wavelength division multiplexer, it is adjusted to being transferred to the light intensity of pump light of the fibre core.

In another kind of optional implementation, the Wavelength tunable narrow linewidth laser based on Graphene Bragg grating is also Including isolator, the input of the isolator connects the doped fiber, and output end connects the first of the first annular device End.

In another kind of optional implementation, the Wavelength tunable narrow linewidth laser based on Graphene Bragg grating is also Including the second circulator and Rayleigh optical fiber, the first end of second circulator is used to be input into the laser signal, the laser Signal is transferred to the first end of the Rayleigh optical fiber from its second end, and the Rayleigh optical fiber produces Rayleigh based on the laser signal Scattered signal simultaneously returns to the second end of second circulator, then by the three-polar output of second circulator.

In another kind of optional implementation, the Wavelength tunable narrow linewidth laser based on Graphene Bragg grating is also Including speculum, the second end of the Rayleigh optical fiber connects the speculum.

In another kind of optional implementation, the Wavelength tunable narrow linewidth laser based on Graphene Bragg grating is also Including adjustable optical attenuator, the adjustable optical attenuator is located between the second end of the Rayleigh optical fiber and the speculum.

In another kind of optional implementation, the Wavelength tunable narrow linewidth laser based on Graphene Bragg grating is also Including the second wavelength division multiplexer and coupler, the first input end of second wavelength division multiplexer connects first pumping laser The output end of device, the second input connects the 3rd end of second circulator, and common port connects the doped fiber;Described The input of coupler described in the three-terminal link of one circulator, the first output end connection of the coupler is described second annular The first end of device, output end of second output end as the adjustable wavelength laser.

The invention has the beneficial effects as follows:

1st, the present invention is by adjusting the cladding thickness of Graphene Bragg grating and being transferred to Graphene Bragg grating The pump light light intensity of fibre core, not only can be adjusted to the centre wavelength of Bragg grating, and can improve Prague light Accuracy and response time that grid centre wavelength is adjusted;

2nd, it is of the invention by adopting Graphene Bragg grating, and by being transferred to Graphene Bragg grating fibre core Pump light is adjusted, and the thickness of Graphene Bragg grating is adjusted, and can improve optical maser wavelength degree of regulation and sound Between seasonable;

3rd, the present invention can be isolated by increasing isolator to the pump light being input into, and reduce interference;

4th, the present invention makes Rayleigh optical fiber based on Rayleigh scattering effect to laser by giving Rayleigh optical fiber by laser signal transmission The live width of signal is compressed, and can reduce the live width of laser signal, and by the fl transmission that produces Rayleigh optical fiber Rayleigh scattering signal is reflected back Rayleigh optical fiber by speculum, and further compression can be done to the live width of laser signal, so as to can Further to reduce the live width of laser signal;

5th, the present invention can avoid speculum from being reflected back by increasing adjustable attenuator between Rayleigh optical fiber and speculum The Rayleigh scattering signal for coming is flooded by laser signal;

6th, the present invention is circulated compression by adopting the second wavelength division multiplexer and coupler to the live width of laser signal, The live width of laser signal can further be reduced.

Description of the drawings

Fig. 1 is one embodiment sectional view of Graphene Bragg grating of the present invention;

Fig. 2 is one embodiment structure of the present invention based on the Wavelength tunable narrow linewidth laser of Graphene Bragg grating Schematic diagram;

Fig. 3 is another embodiment knot of the present invention based on the Wavelength tunable narrow linewidth laser of Graphene Bragg grating Structure schematic diagram.

Specific embodiment

In order that those skilled in the art more fully understand the technical scheme in the embodiment of the present invention, and make of the invention real Apply the above-mentioned purpose of example, feature and advantage can become apparent from it is understandable, below in conjunction with the accompanying drawings to technical side in the embodiment of the present invention Case is described in further detail.

In describing the invention, unless otherwise prescribed and limit, it should be noted that term " connection " should do broad sense manage Solution, can be joined directly together for example, it may be being mechanically connected or electrical connection, or the connection of two element internals, also may be used To be indirectly connected to by intermediary, for the ordinary skill in the art, can as the case may be understand above-mentioned The concrete meaning of term.

It is one embodiment sectional view of Graphene Bragg grating of the present invention referring to Fig. 1.The Graphene Bragg grating Fibre core 101, covering 102 can be included successively from inside to outside and the graphene layer 103 of the covering 102 is wrapped in, by adjusting The thickness of the covering 102, wraps up graphene layer 103 on the covering 102, and adjusts the pump for being transferred to the fibre core 101 The light intensity of Pu light realizes the Graphene Bragg grating centre wavelength adjusting the refraction index modulation of Graphene Bragg grating Regulation.

The transmission performance of laser is reduced for the laser penetration covering for avoiding fibre core to transmit completely, Graphene on the market Bragg grating covering is generally thicker.Compared to Graphene Bragg grating covering on the market, Graphene cloth in the present embodiment The thinner thickness of glug grating covering, the pump light of such fibre core transmission is then possible to penetrate covering and act on graphene layer On.Because there is Graphene the electronics in zero bandgap structure, therefore Graphene valence band to be easy to absorptive pumping optical transition to conduction band On, and meeting dirac distribution, this process can directly result in the electronics distribution of Graphene band structure and change.When changing When becoming the light intensity of pump light, the distribution of the Energy band electron of graphene layer also can change.Due to Graphene Bragg grating Centre wavelength was determined by fiber core refractive index and cycle, and its fibre core has periodically been modulated, therefore graphene layer The change of Energy band electron distribution can further result in the change of the refraction index modulation of grating, so ultimately result in Graphene Bradley The centre wavelength of lattice optical grating reflection spectrum changes.Thus, in the case where cladding thickness is certain, the present invention can be by changing The pump light light intensity of regulation and control Graphene is changing the centre wavelength of Graphene Bragg grating.

When above-mentioned Graphene Bragg grating is made, following methods can be adopted:First, prefabricated Bragg grating;Will The Bragg grating immersion of commercial C-band is corroded in a solution of hydrofluoric acid, by the diameter of Bragg grating (including fibre core and The diameter sum of covering) corrode to 10 to 20 microns, the degree of regulation and response time that now laser wavelength is adjusted all is reached Highest;Secondly, prefabricated graphene film;Commercial copper-based PMMA (flexible polymethyl methacrylate)-Graphene is put using chemistry The method changed is by copper-based removal;Finally, prefabricated Graphene Bragg grating;Copper-based PMMA- Graphenes parcel will be removed to corruption On the Graphene Bragg grating of erosion, with acetone steam PMMA is removed.

As seen from the above-described embodiment, the present invention is by adjusting the cladding thickness of Graphene Bragg grating and being transferred to stone The pump light light intensity of black alkene Bragg grating fibre core, not only can be adjusted, Er Qieke to the centre wavelength of Bragg grating To improve accuracy and the response time that Bragg grating centre wavelength is adjusted.

It is an enforcement of the present invention based on the Wavelength tunable narrow linewidth laser of Graphene Bragg grating referring to Fig. 2 Example structural representation.The adjustable wavelength laser can include the first pump laser 201, doped fiber 202, first annular device 203 and Graphene Bragg grating 204, wherein the Graphene Bragg grating 204 is as shown in figure 1, wrap successively from the inside to the outside Include fibre core 101, covering 102 and be wrapped in the graphene layer 103 of the covering 102, the output of first pump laser 201 End connects the first end of the first annular device 203, the second end of the first annular device 202 by the doped fiber 202 Connect the fibre core.The present invention wraps up graphene layer by the thickness of the regulation covering on the covering, and adjusts transmission To the fibre core of Graphene Bragg grating 204 pump light light intensity come adjust the Graphene Bragg grating modulation roll over Rate is penetrated, the regulation of the Graphene Bragg grating centre wavelength is realized;Adjust in the Graphene Bragg grating centre wavelength After the completion of section, second end close echo a length of regulation of the fibre core of Graphene Bragg grating 204 to the first annular device 203 The laser signal of rear center's wavelength, and by the three-polar output of the first annular device 203, hereby it is achieved that the wavelength of laser Adjustment.

As seen from the above-described embodiment, it is of the invention by adopting Graphene Bragg grating, and by being transferred to Graphene The pump light of Bragg grating fibre core is adjusted, and the thickness of Graphene Bragg grating is adjusted, and can improve laser Wavelength regulation precision and response time.

It is another reality of the present invention based on the Wavelength tunable narrow linewidth laser of Graphene Bragg grating referring to Fig. 3 Apply a structural representation.Fig. 3 can also include with adjustable wavelength laser shown in Fig. 1:Second pump laser 301 and first wave Division multiplexer 302, the first input end of first wavelength division multiplexer 302 connects the second end of the first annular device 203, the Two inputs connect the output end of second pump laser 301, and second pump laser 301 is used for by described the One wavelength division multiplexer 302, is adjusted to being transferred to the light intensity of pump light of the fibre core.In order to carry out to the pump light being input into Isolation, reduces interference, and adjustable wavelength laser can also include isolator 303, and the input connection of the isolator 303 is described Doped fiber 202, output end connects the first end of the first annular device 203.

In order to do further compression to the live width of the laser signal of the three-polar output of first annular device 203, Wavelength tunable swashs Light device can also include the second wavelength division multiplexer 304, coupler 305, the second circulator 306, Rayleigh optical fiber 307, adjustable light decay Subtract device 308 and speculum 309, the first end of second circulator 306 is used to be input into the laser signal, the laser signal The first end of the Rayleigh optical fiber 307 is transferred to from its second end, after the Rayleigh optical fiber 307 is based on laser signal generation To transmission Rayleigh scattering signal and return to the second end of second circulator 306, then by second circulator 306 Three-polar output.Second end of Rayleigh optical fiber 307 is also connected with speculum 309, the fl transmission that such Rayleigh optical fiber 307 is produced Rayleigh scattering signal can be reflected by speculum 309, so as to be transferred to the second end of the second circulator 306, then by The three-polar output of second ring device 306.The present invention makes Rayleigh optical fiber be based on Rayleigh by giving Rayleigh optical fiber by laser signal transmission Scattering effect is compressed to the live width of laser signal, can reduce the live width of laser signal, and is produced by making Rayleigh optical fiber The Rayleigh scattering signal of raw fl transmission is reflected back Rayleigh optical fiber by speculum, and the live width of laser signal can be done into one Step compression, such that it is able to the live width for further reducing laser signal.In order to avoid the Rayleigh scattering signal that speculum is reflected Flooded by laser signal, between the second end of Rayleigh optical fiber 307 and speculum 309 adjustable optical attenuator is also provided with 308。

In addition, compressing to further do circulation to the live width of laser signal, the 3rd end of the first annular device 203 connects The input of the coupler 305 is connect, the first output end of the coupler 305 is used to export the laser signal, second Output end of the output end as the adjustable wavelength laser.The first input end connection institute of second wavelength division multiplexer 304 The output end of the first pump laser 201 is stated, the second input connects the 3rd end of second circulator 306, and common port connects Connect the doped fiber 202.

In the present embodiment, passed by the second wavelength division multiplexer 304 first from the pump light of the output of the first pump laser 201 Doped fiber 202 is defeated by, from the pump light out of doped fiber 202 isolator 303 is first passed through, enter back into first annular device 203 first end, is then entered in Graphene Bragg grating 204 by the first input end of the first wavelength division multiplexer 302, The second input and laser that the pump light of the at the same time output of the second pump laser 301 passes through the first wavelength division multiplexer 302 Signal enters together Graphene Bragg grating 204 simultaneously.Because 204 reflections of Graphene Bragg grating are positioned at C-band Light, so pump light will be by completely through therefore only laser signal will be returned after being filtered from Graphene Bragg grating 204 To the second end of first annular device 203.Because the centre wavelength of the reflectance spectrum of Graphene Bragg grating can be by the second pumping The pump light regulation and control of the different capacity of the output of laser instrument 301, therefore when the power output of the second pump laser 301 is changed, will The laser signal for having different wave length is reflected back toward the second end of the second circulator 203.Bring out to come from the 3rd of the second circulator 203 the Light a part is exported by coupler 305, another part will be fed back in laser cavity, from the of the second circulator 306 One end enters into the distribution Reyleith scanttering light feedback for producing in Rayleigh optical fiber 307 dorsad, and remaining forward signal laser also will be by can Optical attenuator 308 and speculum 309 reflex to the second end of the second circulator 306 again, and from the second circulator 306 Three-polar output is re-entered in laser cavity, so completes one cycle in laser cavity.

As seen from the above-described embodiment, it is of the invention by adopting Graphene Bragg grating, and by being transferred to Graphene The pump light of Bragg grating fibre core is adjusted, and the thickness of Graphene Bragg grating is adjusted, and can improve laser Wavelength regulation precision and response time.

Those skilled in the art will readily occur to its of the present invention after considering specification and putting into practice invention disclosed herein Its embodiment.The application is intended to any modification of the present invention, purposes or adaptations, these modifications, purposes or Person's adaptations follow the general principle of the present invention and including the undocumented common knowledge in the art of the present invention Or conventional techniques.Description and embodiments are considered only as exemplary, and true scope and spirit of the invention are by following Claim is pointed out.

It should be appreciated that the precision architecture for being described above and being shown in the drawings is the invention is not limited in, and And can without departing from the scope carry out various modifications and changes.The scope of the present invention is only limited by appended claim.

Claims (7)

1. a kind of Wavelength tunable narrow linewidth laser based on Graphene Bragg grating, it is characterised in that including the first pumping Laser instrument, doped fiber, first annular device and Graphene Bragg grating, wherein the Graphene Bragg grating is from the inside to the outside Include fibre core, covering successively and be wrapped in the graphene layer of the covering, the output end of first pump laser passes through institute The first end that doped fiber connects the first annular device is stated, the second end of the first annular device connects the fibre core;
By the thickness for adjusting the covering, graphene layer is wrapped up on the covering, and adjust the pump for being transferred to the fibre core The light intensity of Pu light realizes the Graphene Bragg grating center adjusting the refraction index modulation of the Graphene Bragg grating The regulation of wavelength;After the completion of the Graphene Bragg grating centre wavelength is adjusted, the fibre core is to the first annular device The a length of laser signal for adjusting rear center wavelength of the second end close echo, and by the three-polar output of the first annular device.
2. the Wavelength tunable narrow linewidth laser based on Graphene Bragg grating according to claim 1, its feature exists In, also including the second pump laser and the first wavelength division multiplexer, the first input end connection institute of first wavelength division multiplexer The second end of first annular device is stated, the second input connects the output end of second pump laser, and second pumping swashs Light device is used for by first wavelength division multiplexer, is adjusted to being transferred to the light intensity of pump light of the fibre core.
3. the Wavelength tunable narrow linewidth laser based on Graphene Bragg grating according to claim 1, its feature exists In also including isolator, the input of the isolator connects the doped fiber, and output end connects the first annular device First end.
4. the Wavelength tunable narrow linewidth laser based on Graphene Bragg grating according to claim 1, its feature exists In also including the second circulator and Rayleigh optical fiber, the first end of second circulator is used to be input into the laser signal, described Laser signal is transferred to the first end of the Rayleigh optical fiber from its second end, and the Rayleigh optical fiber is produced based on the laser signal Rayleigh scattering signal simultaneously returns to the second end of second circulator, then by the three-polar output of second circulator.
5. the Wavelength tunable narrow linewidth laser based on Graphene Bragg grating according to claim 4, its feature exists In also including speculum, the second end of the Rayleigh optical fiber connects the speculum.
6. the Wavelength tunable narrow linewidth laser based on Graphene Bragg grating according to claim 5, its feature exists In, also including adjustable optical attenuator, the adjustable optical attenuator be located at the Rayleigh optical fiber the second end and the speculum it Between.
7. the Wavelength tunable narrow linewidth laser based on Graphene Bragg grating according to claim 4 or 5 or 6, its It is characterised by, also including the second wavelength division multiplexer and coupler, the first input end connection of second wavelength division multiplexer is described The output end of the first pump laser, the second input connects the 3rd end of second circulator, mixes described in common port connection Veiling glare is fine;The input of coupler described in the three-terminal link of the first annular device, the first output end of the coupler connects Connect the first end of second circulator, output end of second output end as the adjustable wavelength laser.
CN201710152756.1A 2017-03-15 2017-03-15 Wavelength-tunable narrow linewidth laser based on graphene Bragg grating CN106654833A (en)

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CN108387552A (en) * 2018-01-18 2018-08-10 武汉理工大学 Based on graphene SPR long-period fiber grating sensors

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CN107968305A (en) * 2017-11-23 2018-04-27 黑龙江工程学院 A kind of four ends pump narrow spaces Solid State Laser generating means
CN108387552A (en) * 2018-01-18 2018-08-10 武汉理工大学 Based on graphene SPR long-period fiber grating sensors
CN108387552B (en) * 2018-01-18 2020-12-29 武汉理工大学 Graphene SPR (surface plasmon resonance) -based long-period fiber bragg grating sensor

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