CN106953226A - A kind of single longitudinal mode narrow band fiber laser based on the double microcavity modelings of optical-fiber-coupling type - Google Patents
A kind of single longitudinal mode narrow band fiber laser based on the double microcavity modelings of optical-fiber-coupling type Download PDFInfo
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- CN106953226A CN106953226A CN201710244443.9A CN201710244443A CN106953226A CN 106953226 A CN106953226 A CN 106953226A CN 201710244443 A CN201710244443 A CN 201710244443A CN 106953226 A CN106953226 A CN 106953226A
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- 239000000835 fiber Substances 0.000 title claims abstract description 58
- 238000010168 coupling process Methods 0.000 title claims abstract description 45
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 45
- 239000013307 optical fiber Substances 0.000 claims abstract description 36
- 230000008878 coupling Effects 0.000 claims abstract description 8
- 230000010287 polarization Effects 0.000 claims abstract description 6
- 238000005086 pumping Methods 0.000 claims abstract description 6
- 239000004065 semiconductor Substances 0.000 claims abstract description 6
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 5
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 5
- 230000000694 effects Effects 0.000 claims description 6
- 230000001629 suppression Effects 0.000 abstract description 7
- 230000003595 spectral effect Effects 0.000 description 14
- 238000001228 spectrum Methods 0.000 description 9
- 239000004005 microsphere Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000000411 transmission spectrum Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000006096 absorbing agent Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- -1 FP chambers Substances 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
Classifications
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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
- H01S3/06712—Polarising fibre; Polariser
-
- 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
- H01S3/06791—Fibre ring lasers
-
- 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
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08013—Resonator comprising a fibre, e.g. for modifying dispersion or repetition rate
Abstract
The invention discloses a kind of single longitudinal mode narrow band fiber laser based on the double microcavity modelings of optical-fiber-coupling type, the fiber ring laser system includes semiconductor laser pumping source, wavelength division multiplexer, rare-earth doped optical fibre, fibre optic isolater, N*N fiber ports coupler, Polarization Controller, the double microcavitys of optical-fiber-coupling type, and the unit closure that joined end to end by way of fiber coupling forms fiber resonance cavity.Two microcavitys are respectively placed in the both sides of conical fiber, and parallel connection constitutes the double microcavitys of optical-fiber-coupling type.Light enters double microcavitys through conical fiber one end, is transmitted in the way of total reflection in microcavity, forms the resonance of arrowband Whispering-gallery-mode, then be connected to optical fiber harmonic oscillator chamber from the other end output of conical fiber.It regard the double microcavitys of optical-fiber-coupling type as modeling unit in arrowband in fiber resonance cavity.The features such as present invention has side mode suppression ratio height, good monochromaticjty, all -fiber, compact conformation compared to single microcavity.
Description
Technical field
The invention belongs to fiber laser technology field, and in particular to a kind of list based on the double microcavity modelings of optical-fiber-coupling type
Longitudinal mode narrow band fiber laser.
Background technology
Single longitudinal mode narrow bandwidth of light fibre laser is because its threshold value is low, efficiency high, coherence is good, output wavelength is flexible, structure
Simple the advantages of, it is widely used in numerous front line science researchs such as Fibre Optical Sensor and communication, laser radar, high-precision spectrum test
Field.At present, realize that the output of single longitudinal mode laser of narrowband is main by adding arrowband in linear short cavity or optical fibre ring resonator
Wave filter modeling is realized.Linear cavity configuration generally uses fiber grating as its feedback unit, mainly including distributed Feedback
And two kinds of Distributed Bragg Reflection (DBR) (DFB).2010, Shanghai ray machine Meng Li etc. have studied short straight chamber phosphate
Optical fiber laser, laser chamber long 1cm, power output 79mW, because linear cavity chamber length is shorter, the optical fiber laser of short bore configurations
Laser power it is relatively low, and gain fibre length is restricted, and has higher requirement to the making of grating.Ring light
Fine resonator realizes that single longitudinal mode laser of narrowband is exported, it is necessary to add the filter such as saturable absorber, FP chambers, fiber grating in systems
Wave device.2005, S.Huang et al. have studied a kind of structure of optical fiber saturable absorber combination fiber loop mirror phase, line
Width is less than 1.5kHz, but is due to that existing filter bandwidht is usual in more than GHz, limits the further pressure of laser linewidth
Contracting, and there are still cause the wild effect such as mode hopping and frequency drift.
As the mankind explore the continuous extension in field, related application is proposed to the monochromaticjty of optical fiber laser, stability
Higher requirement, how on the premise of single longitudinal mode output is ensured, laser bandwidth is further compressed, optical fiber is met to obtain
Communication and sensory field application demand, highly coherent and highly stable narrow band fiber laser there is important research meaning,
It is the important directions of optical fiber laser development.
The content of the invention
The present invention is in view of the shortcomings of the prior art, it is proposed that the single longitudinal mode narrow band light based on the double microcavity modelings of optical-fiber-coupling type
Fibre laser, double microcavitys are constituted by two microcavity parallel connections, and coupling incoming fiber optic laser resonant cavity using conical fiber is carried out
Modeling, based on the arrowband echo wall die resonance spectrum in the double microcavitys of optical-fiber-coupling type, realizes that single longitudinal mode narrow band fiber laser is exported.Should
Optical fiber laser has the advantages that monochromaticjty is good, stability is high, compact conformation.
To achieve the above object, the technical solution adopted by the present invention is a kind of list based on the double microcavity modelings of optical-fiber-coupling type
Longitudinal mode narrow band fiber laser, the laser includes：Semiconductor laser pumping source, wavelength division multiplexer, rare-earth doped optical fibre, optical fiber
The double microcavitys of isolator, N*N fiber ports coupler, Polarization Controller and optical-fiber-coupling type, above-mentioned part is coupled by all -fiber
Mode be connected, wherein, the output end in the semiconductor laser pumping source is connected with wavelength division multiplexer input, wavelength division multiplexer
Output end successively via isolator, coupler, Polarization Controller, the double microcavitys of optical-fiber-coupling type, fiber coupler, rear-earth-doped
Optical fiber is connected with wavelength division multiplexer, constitutes fiber resonance cavity, and fiber coupler is by optical fibre ring resonator main chamber and N-1 optical fiber
Harmonic oscillator chamber is connected, and the double microcavitys of optical-fiber-coupling type are of coupled connections by conical fiber with one of optical fiber harmonic oscillator chamber, entirely
Cursor effect is produced by way of the sub- chamber cascade of multiple optical fiber in laser resonant cavity, realizes that single longitudinal mode laser of narrowband is exported.
Further, the microcavity shapes of the double microcavitys of above-mentioned optical-fiber-coupling type can be annular, spherical, dish type or cylindricality, light
Enter double microcavitys through conical fiber one end, transmitted in the way of total reflection in microcavity, form the resonance of arrowband Whispering-gallery-mode, then
Optical fiber harmonic oscillator chamber is connected to from the other end output of conical fiber.
Two microcavitys of the double microcavitys of above-mentioned optical-fiber-coupling type are respectively placed in the both sides of conical fiber with parallel way.
Above-mentioned N is the integer more than 1.
Compared with prior art, the invention has the advantages that：
1st, the present invention realizes modeling using the double microcavitys of optical-fiber-coupling type, produces cursor effect after two microcavitys are in parallel, compares
In single microcavity, echo wall die resonance spectrum side mode suppression ratio that it is obtained is higher, bandwidth is narrower, Free Spectral Range (FSR,
Free Spectral Range) it is bigger, single longitudinal mode laser of narrowband modeling ability is stronger.
2nd, using the sub- chamber of multiple optical fiber and double microcavity parallel-connection structures, whole laser resonant cavity pattern choosing is further increased
The fineness selected, have compressed laser bandwidth, improves laser side mode suppression ratio and stability.
3rd, using all optical fiber cavity structure, coupling loss is small, compact conformation, and delivery efficiency is high, to external world the anti-interference energy of environment
Power is strong.
Brief description of the drawings
Fig. 1 is single longitudinal mode narrow band fiber laser structure schematic diagram of the present invention based on the double microcavity modelings of optical-fiber-coupling type.
Fig. 2 is the double micro-cavity structures of optical-fiber-coupling type and light field transmission schematic diagram.
Fig. 3 is double microballoon coupling experiment system pictorial diagrams.
Fig. 4 is echo wall die optical field distribution figure in double Microsphere Cavities of Finite Difference Time Domain acquisition.(the mono- microballoons of a-, b-
Double microballoons)
Fig. 5 show single microballoon of Finite Difference Time Domain acquisition and double microballoon echo wall die transmission spectrum contrasts.
Fig. 6 show single microballoon and the double microballoon echo wall die transmission spectrum contrasts that experiment is measured.
Fig. 7 is that the optical fiber laser spectrum based on the double microcavitys of optical-fiber-coupling type, optical-fiber-coupling type list microcavity, free-running is real
Test test result is contrasted.
Fig. 8 is the microcavity schematic diagram of different geometries of the present invention.
Embodiment
Technical scheme is described in detail with reference to Figure of description.
The present invention is the arrowband modeling unit by the use of the double microcavitys of optical-fiber-coupling type as optical fiber laser.Double microballoons are in parallel
Be positioned over the both sides of conical fiber, the cursor effect produced using the parallel connection of double microcavitys, obtain that side mode suppression ratio is higher, bandwidth more
Narrow, Free Spectral Range is bigger, the stronger echo wall die resonance spectrum of single longitudinal mode laser of narrowband modeling ability.Optical-fiber-coupling type is double
Microcavity is placed in the optical fiber harmonic oscillator chamber of parallel connection, realizes narrow bandwidth, high side mode suppression ratio, low noise, stable optical fiber laser.
The concrete technical scheme just to the present invention is briefly described below.
The present invention optical fiber laser basic structure as shown in figure 1, including：1st, semiconductor laser pumping source, 2, wavelength-division
Multiplexer, 3, optoisolator, 4, coupler, 5, Polarization Controller, 6, the double microcavitys of optical-fiber-coupling type, 7, (N is whole more than 1 to N*N
Number) fiber port coupler, 8, rare-earth doped optical fibre.All devices joined end to end by way of fiber coupling composition optical fiber it is humorous
Shake chamber.
It is illustrated in figure 2 geometric cross section and the light field transmission schematic diagram of the double microcavitys of optical-fiber-coupling type.Wherein：E1- coupling is defeated
Enter light field strong, E2- cone area upper end echo wall die field intensity, E3- cone area lower end echo wall die field intensity, E4- coupling output light field intensity.
It is illustrated in figure 3 the double microcavity pictorial diagrams of optical-fiber-coupling type that the present invention is used.Two microsphere diameters are respectively in figure
198.445 μm, 198.344 μm, conical fiber both sides are placed on, the full optical fiber laser modeling in fiber laser cavity is realized.
Fig. 4 (a) show in the single microballoon obtained based on Finite Difference Time Domain echo wall die light field at 1557.25nm
In distribution map, figure microsphere diameter be 35 μm, fibre diameter be 1.4 μm, microballoon-conical fiber at intervals of 0.1 μm, Fig. 4 (b) institutes
It is shown as double microballoon system echo wall die optical field distribution figures at 1556.84nm, wherein micro-sphere material refractive index, microballoon-cone of light
The parameters such as fine interval are consistent with Fig. 4 (a).
Fig. 5 show single microballoon and double microballoon echo wall die transmission spectrums in Finite Difference Time Domain emulation acquisition Fig. 4
Contrast.
The Free Spectral Range (Free Spectral Range (FSR)) of optical resonator internal resonance spectrum meets formula：
F=λ2 c/(neff·L)
In formula, neffFor the effective refractive index of Microsphere Cavities, λcFor resonant wavelength, L is the actual range that light path is transmitted one week.
For two microcavitys double microcavitys in parallel, because different microcavity sizes are different, its Free Spectral Range is also different, and double microcavitys are always
Free Spectral Range F is：
F=NF1=(N+1) F2
In formula, F1,F2The Free Spectral Range of respectively two microcavitys is (assuming that F1＞ F2), N is positive integer, then can be with
Obtain
F=F1F2/|F2-F1|
Double microcavity parallel-connection structures are exaggerated F compared to single microcavity, its Free Spectral Range2/|F2-F1| times, that is, produce trip
Effect is marked, so as to obtain larger Free Spectral Range (Free Spectral Range (FSR)), it is easier to obtain single longitudinal mode laser of narrowband
Output.
Fig. 6 show the single microballoon and double microballoon echo wall die transmission spectrum contrast (double microballoon systems such as figures three that experiment is measured
It is shown), wherein single microsphere diameter is 198.445 μm, double microsphere diameters are respectively 198.445 μm and 198.344 μm.Surveyed by experiment
Examination is understood, compared to single microballoon, can obtain that bandwidth is narrower, side mode suppression ratio is higher, free spectrum model using double microballoon parallel connections
(Free Spectral Range (FSR)) bigger Whispering-gallery-mode Free Spectral Range (Free Spectral Range (FSR)) is enclosed, with theory meter
Result is calculated to be consistent.
Realize that optical fibre ring swashs based on optical-fiber-coupling type double microcavity, optical-fiber-coupling type list microcavity, free-runnings etc. shown in Fig. 7
The spectrum test figure of single-frequency selection and compression bandwidth in light device chamber.Wherein, selected using the double microcavitys of optical-fiber-coupling type as laser
Form unit, 3dB output spectrums bandwidth is less than 0.01nm.This method is effectively improved side mode suppression ratio, have compressed laser tape
Width, improves laser delivery efficiency and stability.
It is illustrated in figure 8 several microcavitys of different shapes, including spherical, annular, dish type or cylindricality.
From the above description it should be understood that, although have illustrated and described specific implementation, but it can be made and
This is susceptible to various modifications.The present invention is not intended to be limited by the specific example provided in specification.Although before having referred to
State specification and describe the present invention, but this specification description related to the preferred embodiment and explanation should not be come with restricted meaning
Explain.Moreover, it will be appreciated that all aspects of the invention are not limited to the above-described tool for depending on a variety of conditions and variable
Body is described, configured or relative scale.To the various modifications in the form and details of embodiment of the present invention for art technology
It would is that for personnel obvious.
Claims (4)
1. a kind of single longitudinal mode narrow band fiber laser based on the double microcavity modelings of optical-fiber-coupling type, it is characterised in that the laser
Device includes：Semiconductor laser pumping source, wavelength division multiplexer, rare-earth doped optical fibre, fibre optic isolater, N*N fiber ports coupler,
Polarization Controller and the double microcavitys of optical-fiber-coupling type, above-mentioned part are connected by way of all -fiber is coupled, wherein, the semiconductor
The output end of laser pumping source is connected with wavelength division multiplexer input, and the output end of wavelength division multiplexer is successively via isolator, coupling
The double microcavitys of clutch, Polarization Controller, optical-fiber-coupling type, fiber coupler, rare-earth doped optical fibre are connected with wavelength division multiplexer, constitute
Optical fibre ring resonator main chamber is connected by fiber resonance cavity, fiber coupler with N-1 optical fiber harmonic oscillator chamber, and optical-fiber-coupling type is double
Microcavity is of coupled connections by conical fiber with one of optical fiber harmonic oscillator chamber, and multiple optical fiber are passed through in whole laser resonant cavity
The mode of sub- chamber cascade produces cursor effect, realizes that single longitudinal mode laser of narrowband is exported.
2. the single longitudinal mode narrow band fiber laser according to claim 1 based on the double microcavity modelings of optical-fiber-coupling type, it is special
It is that the microcavity shapes of the double microcavitys of the optical-fiber-coupling type can be annular, spherical, dish type or cylindricality to levy, and light is through conical fiber
One end enters double microcavitys, is transmitted in the way of total reflection in microcavity, forms the resonance of arrowband Whispering-gallery-mode, then from conical fiber
The other end output be connected to optical fiber harmonic oscillator chamber.
3. the single longitudinal mode narrow band fiber laser according to claim 1 or 2 based on the double microcavity modelings of optical-fiber-coupling type, its
It is characterised by that two microcavitys of the double microcavitys of the optical-fiber-coupling type are respectively placed in the both sides of conical fiber with parallel way.
4. the single longitudinal mode narrow band fiber laser according to claim 1 based on the double microcavity modelings of optical-fiber-coupling type, it is special
Levy is that the N is the integer more than 1.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108321670A (en) * | 2018-03-22 | 2018-07-24 | 华南理工大学 | A kind of micro-cavity laser of cascaded pump |
| CN109004501A (en) * | 2018-07-20 | 2018-12-14 | 中国科学院合肥物质科学研究院 | A kind of high stable tunable single longitudinal mode circular cavity optic fibre laser |
| CN109186641A (en) * | 2018-08-01 | 2019-01-11 | 中国电子科技集团公司第十研究所 | A kind of method and fibre optical sensor manufacturing fibre optical sensor |
| CN109459011A (en) * | 2018-12-26 | 2019-03-12 | 哈尔滨工业大学 | The parallel optical fibre gyro of dicyclo resonant cavity |
| CN109631961A (en) * | 2019-01-15 | 2019-04-16 | 中国科学技术大学 | A kind of optical sensor based on double ampuliform micro resonant cavities |
| CN111060905A (en) * | 2020-01-15 | 2020-04-24 | 中国人民解放军空军预警学院 | Microwave photon active passive silent radar based on microcavity and full-medium antenna array |
| CN111146673A (en) * | 2019-12-27 | 2020-05-12 | 北京邮电大学 | Ultra-narrow linewidth single-frequency fiber laser based on three-ring passive resonant cavity |
| CN111146674A (en) * | 2019-12-27 | 2020-05-12 | 北京邮电大学 | Ultra-narrow linewidth single-frequency fiber laser based on double-ring resonant cavity |
| CN112117630A (en) * | 2020-09-23 | 2020-12-22 | 北京邮电大学 | Full polarization maintaining structure ultra-narrow linewidth single-frequency optical fiber laser based on double-ring type resonant cavity |
| CN112683793A (en) * | 2020-12-09 | 2021-04-20 | 哈尔滨工程大学 | Sensor for detecting concentration of liquid drops based on double-microsphere coupling mode splitting |
| CN112729776A (en) * | 2020-12-09 | 2021-04-30 | 哈尔滨工程大学 | Device for detecting substrate thermal uniformity by utilizing double-microsphere coupling mode splitting |
| CN114485985A (en) * | 2022-04-01 | 2022-05-13 | 哈尔滨理工大学 | Double-parameter optical fiber sensor with cascaded microsphere cavities |
| CN114563844A (en) * | 2021-07-01 | 2022-05-31 | 陕西铁路工程职业技术学院 | Novel cascaded microsphere cavity filter |
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| US20120033688A1 (en) * | 2010-01-25 | 2012-02-09 | National Taiwan University Of Science And Technology | Single longitudinal mode fiber laser apparatus |
| CN105098575A (en) * | 2015-07-22 | 2015-11-25 | 南京邮电大学 | Narrow-band fiber laser for mixed medium microcavity full-optical tuning |
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2017
- 2017-04-14 CN CN201710244443.9A patent/CN106953226A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20120033688A1 (en) * | 2010-01-25 | 2012-02-09 | National Taiwan University Of Science And Technology | Single longitudinal mode fiber laser apparatus |
| CN105098575A (en) * | 2015-07-22 | 2015-11-25 | 南京邮电大学 | Narrow-band fiber laser for mixed medium microcavity full-optical tuning |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108321670B (en) * | 2018-03-22 | 2023-12-01 | 华南理工大学 | Cascaded pumped microcavity laser |
| CN108321670A (en) * | 2018-03-22 | 2018-07-24 | 华南理工大学 | A kind of micro-cavity laser of cascaded pump |
| CN109004501A (en) * | 2018-07-20 | 2018-12-14 | 中国科学院合肥物质科学研究院 | A kind of high stable tunable single longitudinal mode circular cavity optic fibre laser |
| CN109186641B (en) * | 2018-08-01 | 2022-03-11 | 中国电子科技集团公司第十一研究所 | Method for manufacturing optical fiber sensor and optical fiber sensor |
| CN109186641A (en) * | 2018-08-01 | 2019-01-11 | 中国电子科技集团公司第十研究所 | A kind of method and fibre optical sensor manufacturing fibre optical sensor |
| CN109459011A (en) * | 2018-12-26 | 2019-03-12 | 哈尔滨工业大学 | The parallel optical fibre gyro of dicyclo resonant cavity |
| CN109631961A (en) * | 2019-01-15 | 2019-04-16 | 中国科学技术大学 | A kind of optical sensor based on double ampuliform micro resonant cavities |
| CN111146673A (en) * | 2019-12-27 | 2020-05-12 | 北京邮电大学 | Ultra-narrow linewidth single-frequency fiber laser based on three-ring passive resonant cavity |
| CN111146674A (en) * | 2019-12-27 | 2020-05-12 | 北京邮电大学 | Ultra-narrow linewidth single-frequency fiber laser based on double-ring resonant cavity |
| CN111060905A (en) * | 2020-01-15 | 2020-04-24 | 中国人民解放军空军预警学院 | Microwave photon active passive silent radar based on microcavity and full-medium antenna array |
| CN112117630A (en) * | 2020-09-23 | 2020-12-22 | 北京邮电大学 | Full polarization maintaining structure ultra-narrow linewidth single-frequency optical fiber laser based on double-ring type resonant cavity |
| CN112683793A (en) * | 2020-12-09 | 2021-04-20 | 哈尔滨工程大学 | Sensor for detecting concentration of liquid drops based on double-microsphere coupling mode splitting |
| CN112729776A (en) * | 2020-12-09 | 2021-04-30 | 哈尔滨工程大学 | Device for detecting substrate thermal uniformity by utilizing double-microsphere coupling mode splitting |
| CN114563844A (en) * | 2021-07-01 | 2022-05-31 | 陕西铁路工程职业技术学院 | Novel cascaded microsphere cavity filter |
| CN114485985A (en) * | 2022-04-01 | 2022-05-13 | 哈尔滨理工大学 | Double-parameter optical fiber sensor with cascaded microsphere cavities |
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Application publication date: 20170714 |