CN207069278U - 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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- CN207069278U CN207069278U CN201720391890.2U CN201720391890U CN207069278U CN 207069278 U CN207069278 U CN 207069278U CN 201720391890 U CN201720391890 U CN 201720391890U CN 207069278 U CN207069278 U CN 207069278U
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Abstract
The utility model 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 forms the double microcavitys of optical-fiber-coupling type.Light enters double microcavitys through conical fiber one end, is transmitted in a manner 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.Using the double microcavitys of optical-fiber-coupling type as modeling unit in arrowband in fiber resonance cavity.The utility model has the characteristics that side mode suppression ratio is high, monochromaticjty is good, all -fiber, compact-sized compared to single microcavity.
Description
Technical field
The utility model belongs to fiber laser technology field, and in particular to one kind is based on the double microcavity modelings of optical-fiber-coupling type
Single 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
The advantages that simple, 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 the output of single longitudinal mode laser of narrowband mainly by adding arrowband in linear short cavity or optical fibre ring resonator
Wave filter modeling is realized.Linear cavity configuration generally use fiber grating is 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 grows shorter, the optical fiber laser of short bore configurations
Laser power it is relatively low, and gain fibre length is restricted, and the making to grating has higher requirement.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 because existing filter bandwidht is generally 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 proposes to monochromaticjty, the stability of optical fiber laser
Higher requirement, how on the premise of single longitudinal mode output is ensured, laser bandwidth is further compressed, meets optical fiber 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.
Utility model content
The utility model is in view of the shortcomings of the prior art, it is proposed that the single longitudinal mode based on the double microcavity modelings of optical-fiber-coupling type is narrow
Band optical fiber laser, double microcavitys are formed by the way that two microcavitys are in parallel, incoming fiber optic laser resonant cavity is coupled using conical fiber
Modeling is carried out, 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 defeated
Go out.The optical fiber laser has the advantages that monochromaticjty is good, stability is high, compact-sized.
To achieve the above object, the technical solution adopted in the utility model is based on the double microcavity modelings of optical-fiber-coupling type to be a kind of
Single longitudinal mode narrow band fiber laser, the laser includes：Semiconductor laser pumping source, wavelength division multiplexer, rare-earth doped optical fibre,
The double microcavitys of fibre optic isolater, N*N fiber ports coupler, Polarization Controller and optical-fiber-coupling type, above-mentioned part pass through all -fiber
The mode of coupling is connected, wherein, the output end in the semiconductor laser pumping source is connected with wavelength division multiplexer input, and wavelength-division is multiple
With the output end of device successively via isolator, coupler, Polarization Controller, optical-fiber-coupling type double microcavity, fiber coupler, rare earths
Doped fiber is connected with wavelength division multiplexer, forms fiber resonance cavity, and fiber coupler is individual 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 and one of optical fiber harmonic oscillator chamber,
Whole laser resonator intracavitary produces cursor effect by way of the sub- chamber cascade of multiple optical fiber, realizes that single longitudinal mode laser of narrowband is defeated
Go out.
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 a manner 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 utility model has the advantages that：
1st, the utility model realizes modeling using the double microcavitys of optical-fiber-coupling type, and cursor effect is produced after two microcavity parallel connections,
Compared to 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) is bigger, and 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, it have compressed laser bandwidth, improve laser side mode suppression ratio and stability.
3rd, using all optical fiber cavity structure, coupling loss is small, compact-sized, and delivery efficiency is high, to the anti-interference energy of external environment
Power is strong.
Brief description of the drawings
Fig. 1 is single longitudinal mode narrow band fiber laser structure signal of the utility model based on the double microcavity modelings of optical-fiber-coupling type
Figure.
Fig. 2 is that the double micro-cavity structures of optical-fiber-coupling type and light field transmit schematic diagram.
Fig. 3 is double microballoon coupling experiment system pictorial diagrams.
Fig. 4 (a) is echo wall die optical field distribution figure in double Microsphere Cavities of single microballoon Finite Difference Time Domain acquisition.
Fig. 4 (b) is echo wall die optical field distribution figure in double Microsphere Cavities of double microballoon Finite Difference Time Domains acquisitions.
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 measures.
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 contrasts.
Fig. 8 is the microcavity schematic diagram of the utility model different geometries.
Embodiment
The technical solution of the utility model is described in detail with reference to Figure of description.
The utility model is the arrowband modeling unit by the use of the double microcavitys of optical-fiber-coupling type as optical fiber laser.By double microballoons
Parallel connection is positioned over the both sides of conical fiber, and using cursor effect caused by double microcavity parallel connections, acquisition side mode suppression ratio is higher, bandwidth
It is narrower, Free Spectral Range is bigger, the stronger echo wall die resonance spectrum of single longitudinal mode laser of narrowband modeling ability.By optical-fiber-coupling type
Double microcavitys are placed in the optical fiber harmonic oscillator intracavitary of parallel connection, realize narrow bandwidth, high side mode suppression ratio, low noise, stable optical-fiber laser
Device.
Just concrete technical scheme of the present utility model is briefly described below.
The basic structure of optical fiber laser of the present utility model 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*N (N be more than
1 integer) fiber port coupler, 8, rare-earth doped optical fibre.All devices are joined end to end composition by way of fiber coupling
Fiber resonance cavity.
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
It is strong to enter light field, E2- cone area upper end echo wall die field strength, E3- cone area lower end echo wall die field strength, E4- coupling output light field strength.
It is illustrated in figure 3 the double microcavity pictorial diagrams of optical-fiber-coupling type of the utility model use.Two microsphere diameters point in figure
Wei not be 198.445 μm, 198.344 μm, conical fiber both sides are placed on, realize the full optical fiber laser choosing of optical fiber laser intracavitary
Mould.
Fig. 4 (a) show in the single microballoon obtained based on Finite Difference Time Domain echo wall die light field at 1557.25nm
Distribution map, microsphere diameter is 35 μm in figure, and fibre diameter is 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 transmits 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 single microballoon and double microballoon echo wall die transmission spectrum contrast (the double microballoon system such as Fig. 3 institutes that experiment measures
Show), wherein single microsphere diameter is 198.445 μm, double microsphere diameters are respectively 198.445 μm and 198.344 μm.By experiment test
Understand, compared to single microballoon, can obtain that bandwidth is narrower, side mode suppression ratio is higher, Free Spectral Range using double microballoon parallel connections
(Free Spectral Range (FSR)) bigger Whispering-gallery-mode Free Spectral Range (Free Spectral Range (FSR)), with theoretical calculation
As a result it is 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
Light device intracavitary single-frequency selects and the spectrum test figure of compression bandwidth.Wherein, selected using the double microcavitys of optical-fiber-coupling type as laser
Form unit, 3dB output spectrums bandwidth are less than 0.01nm.This method is effectively improved side mode suppression ratio, have compressed laser tape
Width, improve laser delivery efficiency and stability.
It is illustrated in figure 8 several microcavitys of different shapes, including spherical, annular, dish type or cylindricality.
Although from the above description it should be appreciated that having illustrated and described specific implementation, it can be made and
This is susceptible to various modifications.The utility model is not intended to be limited by the specific example provided in specification.Although join
Examine aforementioned specification and describe the utility model, but this specification description related to the preferred embodiment and explanation should not be with restricted
Meaning explain.Moreover, it will be appreciated that all aspects of the present utility model be not limited to it is above-described depend on a variety of
Specific description, configuration or the relative scale of part and variable.Various in the form and details of the utility model embodiment are repaiied
Change and would is that to those skilled in the art obviously.
Claims (4)
- A kind of 1. 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 coupling, 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, form 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 and one of optical fiber harmonic oscillator chamber, and whole laser resonator intracavitary passes through multiple optical fiber The mode of sub- chamber cascade produces cursor effect, realizes that single longitudinal mode laser of narrowband exports.
- 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 Sign is that the microcavity shapes of the double microcavitys of the optical-fiber-coupling type are annular or spherical or dish type or cylindricality, and light is through conical fiber one end Into double microcavitys, transmitted in a manner of total reflection in microcavity, form the resonance of arrowband Whispering-gallery-mode, then from the another of conical fiber One end output is 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 Sign is that the N is the integer more than 1.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110568558A (en) * | 2019-10-09 | 2019-12-13 | 中国计量大学 | Echo wall resonator based on double-conical optical fiber coupling double microspheres |
| CN112134140A (en) * | 2020-09-07 | 2020-12-25 | 南京邮电大学 | Electrically-controlled active coupled cavity laser |
| 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 |
-
2017
- 2017-04-14 CN CN201720391890.2U patent/CN207069278U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110568558A (en) * | 2019-10-09 | 2019-12-13 | 中国计量大学 | Echo wall resonator based on double-conical optical fiber coupling double microspheres |
| CN112134140A (en) * | 2020-09-07 | 2020-12-25 | 南京邮电大学 | Electrically-controlled active coupled cavity laser |
| 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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