CN107046221A - A kind of single-frequency narrow band fiber laser based on the high symmetrical microcavity of circularity three-dimensional rotation - Google Patents
A kind of single-frequency narrow band fiber laser based on the high symmetrical microcavity of circularity three-dimensional rotation Download PDFInfo
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- CN107046221A CN107046221A CN201710101888.1A CN201710101888A CN107046221A CN 107046221 A CN107046221 A CN 107046221A CN 201710101888 A CN201710101888 A CN 201710101888A CN 107046221 A CN107046221 A CN 107046221A
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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
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06716—Fibre compositions or doping with active elements
-
- 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
-
- 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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
Abstract
The invention discloses a kind of single-frequency narrow band fiber laser based on the high symmetrical microcavity of circularity three-dimensional rotation, including：Diode-end-pumped source, wavelength division multiplexer, optoisolator, rare-earth doped optical fibre, Polarization Controller and photo-coupler, also include high circularity Microsphere Cavities conical fiber coupling unit, diode-end-pumped source is connected through wavelength division multiplexer with optoisolator, and be connected by the output end of optoisolator with rare-earth doped optical fibre, the output end of rare-earth doped optical fibre passes sequentially through Polarization Controller, high circularity Microsphere Cavities conical fiber coupling unit, photo-coupler, and being finally connected by optocoupler output with wavelength division multiplexer input closes coelosis.The present invention carries out frequency-selecting using high circularity Microsphere Cavities conical fiber coupling unit, the ultra-narrow bandwidth echo wall die resonance spectrum formed in high circularity Microsphere Cavities causes output laser to have the advantages that ultra-narrow bandwidth, also has the advantages that coherence is good, stability is high, compact conformation, cost are low, loss is small.
Description
Technical field
The invention belongs to fiber laser technology field, it is related to a kind of single-frequency based on the high symmetrical microcavity of circularity three-dimensional rotation
Narrow band fiber laser.
Background technology
The features such as single-frequency narrow bandwidth of light fibre laser has coherence's height, frequency-tunable, low noise, compact conformation,
The various fields such as spectroscopy, Fibre Optical Sensor, oil exploration, power system, military and national defense are with a wide range of applications.
Realize that single-frequency laser of narrowband is exported, key technology is cavity configuration reasonable in design, using suitable filtering technique,
To reach the arrowband frequency-selecting in resonator.At present, can be by the Ultrashort cavity, linear cavity of built-in saturated absorbing body, Compound Cavity, narrow
Band filter part (such as bragg grating, F-P cavity) realizes that single-frequency laser of narrowband is exported.However, Ultrashort cavity is needed in height
Grating is inscribed on concentration rare-earth doped optical fibre, its cost of manufacture is high, technical difficulty is big and optical output power of laser is long by chamber
Limitation；The linear cavity stability of built-in saturated absorbing body is poor, and light conversion efficiency is low；Compound Cavity is complicated and reduces system
Compactedness and stability；The three dB bandwidth of the narrow-band filtering device such as bragg grating, F-P cavity is generally in more than 0.05nm, limit
Laser device laser output is made, line width is further compressed, and Mode-hopping Phenomena easily occurred.Therefore, how in compression laser output
While bandwidth, stability and compactedness, reduction cost of manufacture, the increase power output of raising system, which turn into, realizes single-frequency arrowband
The key of laser.
The content of the invention
It is scarce that cost of manufacture that the present invention exists for prior art is high, stability is poor, compactedness is low, output bandwidth is big etc.
A kind of point, it is proposed that single-frequency narrow bandwidth of light fibre laser of the high symmetrical microcavity frequency-selecting of circularity three-dimensional rotation.The optical fiber laser
Resonator carries out frequency-selecting using high circularity Microsphere Cavities-conical fiber coupling unit, swashs in high circularity, the symmetrical microcavity of three-dimensional rotation
Ultra-narrow band echo wall die resonance spectrum (three dB bandwidth reaches 1pm) is sent out, the deep compression of optical fiber laser output bandwidth is realized, and had
High stability, low cost, it is simple in construction the features such as.In addition, the present invention is also using two-dimentional superhigh precision coupled system, with nanoscale
The coupling distance and coupling position of precision controlling conical fiber and Microsphere Cavities, further improve Q values, the compression of microcavity coupled system
Echo wall die resonance spectrum bandwidth, reduction high-order mode, increase side mode suppression ratio, compression laser bandwidth, improving stability.
The present invention is in order to solve the above technical problems, the technical scheme is that the single-frequency narrow bandwidth of light fibre laser includes
Diode-end-pumped source, wavelength division multiplexer, optoisolator, rare-earth doped optical fibre, Polarization Controller and photo-coupler, also
Including high circularity Microsphere Cavities-conical fiber coupling unit, diode-end-pumped source is through wavelength division multiplexer and optoisolator phase
Even, and it is connected by the output end of optoisolator with rare-earth doped optical fibre, the output end of rare-earth doped optical fibre passes sequentially through polarization
Controller, high circularity Microsphere Cavities-conical fiber coupling unit, photo-coupler, finally by optocoupler output and wavelength-division multiplex
Device input, which is connected, closes coelosis.
Further, above-mentioned high circularity Microsphere Cavities-conical fiber coupling unit is using two-dimentional ultra-high magnifications microscopic system and height
Accuracy Displacement platform controls the coupling distance and coupling position of Microsphere Cavities and conical fiber.
The characteristics of above-mentioned Microsphere Cavities have high circularity, high symmetry, high-cleanness, high, can effectively suppress echo wall die resonance spectrum
In high-order mode, improve resonance spectrum side mode suppression ratio, compress resonance spectrum bandwidth, lifted resonance spectrum Q values, realize single-frequency laser of narrowband
Output.
The present invention is it is further proposed that a kind of utilize the above-mentioned single-frequency narrow band light based on the high symmetrical microcavity of circularity three-dimensional rotation
Fibre laser carries out the arrowband frequency-selecting method in resonator, and incident light enters cone area from one end of conical fiber during frequency-selecting, passes through
Evanscent field is coupled into Microsphere Cavities, is transmitted with total reflection mode in the Microsphere Cavities equatorial plane, and forms ultra-narrow band echo wall die resonance
Spectrum, realizes the arrowband frequency-selecting in resonant cavity of fibre-optical laser.
Further, during frequency-selecting conical fiber face is coupled under the line with Microsphere Cavities, and coupling distance is accurately controlled
Nano grade.
Compared with the prior art, the present invention has the advantages that：
1st, the present invention carries out frequency-selecting using high circularity Microsphere Cavities-conical fiber coupling unit, and contained high circularity, height are symmetrical
Property, the ultra-narrow bandwidth echo wall die resonance spectrum (three dB bandwidth is about 1pm) that is formed in high-cleanness, high Microsphere Cavities cause output laser tool
There is ultra-narrow bandwidth.
2nd, the present invention is using two-dimentional ultra-high magnifications microscopic system and high precision position moving stage control Microsphere Cavities and conical fiber
Coupling distance and position, precision effectively increase coupling efficiency up to Nano grade, excite ultra-narrow band echo wall die resonance spectrum,
Further compress laser output bandwidth and improve laser stability.
3rd, laser of the present invention is built using all-fiber devices and realizes arrowband frequency-selecting, with coherence is good, stability is high,
Compact conformation, cost are low, small loss and other features.
Brief description of the drawings
Fig. 1 is the principle schematic that light is transmitted in Microsphere Cavities with different angles.
Fig. 2 is high circularity of the invention, the structural representation of the single frequency optical fiber laser of the symmetrical microcavity frequency-selecting of three-dimensional rotation ball.
Fig. 3 is microballoon pictorial diagram and different ovalitys.
Identifier declaration：(3a) high circularity, high symmetry microballoon；(3b) low circularity, asymmetric microballoon.
Fig. 4 is the flawless microballoon in surface and surface the microballoon pictorial diagram defective by clean processing.
Identifier declaration：(4a) treated clean microballoon；(4b) microballoon defective.
Fig. 5 is the conical fiber under different couple states-Microsphere Cavities coupling pictorial diagram.
Identifier declaration：Under (5a) Critical Coupling state；Under (5b) undercoupling state；Under (5c) overcoupling state.
Fig. 6 is pictorial diagram of the conical fiber in the Microsphere Cavities equatorial plane and the deviation equatorial plane.
Identifier declaration：(6a)-conical fiber is in the microballoon equatorial plane；(6b) conical fiber deviates the microballoon equatorial plane.
3.512 μm of conical fibers of Tu7Wei Zhui areas diameter respectively with a diameter of 195.172 μm of high circularity microballoon and a diameter of
The Whispering-gallery-mode coupling transmission spectrum contrast that 195.713 μm of low circularity microballoon coupling is obtained.
Fig. 8 is that conical fiber couples transmission spectrum pair in the Whispering-gallery-mode of the Microsphere Cavities equatorial plane and the deviation Microsphere Cavities equatorial plane
Than.
Fig. 9 is the Whispering-gallery-mode coupling transmission spectrum obtained under Critical Coupling, undercoupling and overcoupling state.
Figure 10 for realized with high circularity Microsphere Cavities-conical fiber coupling unit annular optical fiber laser intracavitary single-frequency selection and
The spectrum test figure of bandwidth reduction.
Embodiment
Technical scheme is described in detail with reference to Figure of description.Optical-fiber laser proposed by the present invention
Device, its structure includes：Diode-end-pumped source, wavelength division multiplexer, optoisolator, rare-earth doped optical fibre, Polarization Controller,
High circularity Microsphere Cavities-conical fiber coupling unit and photo-coupler；The diode-end-pumped source is through wavelength division multiplexer
It is connected with optoisolator, and is connected by the output end of optoisolator with rare-earth doped optical fibre, rear-earth-doped output end is successively
By Polarization Controller, high symmetrical Microsphere Cavities-conical fiber frequency-selecting unit, photo-coupler, finally by optocoupler output with
Wavelength division multiplexer input, which is connected, closes coelosis.
High circularity Microsphere Cavities-conical fiber frequency-selecting unit is provided with the resonant cavity of fibre-optical laser of the present invention：Incident light from
One end of conical fiber enters cone area, and Microsphere Cavities are coupled into by evanscent field, is passed with total reflection mode in the Microsphere Cavities equatorial plane
It is defeated, then be connected by the conical fiber other end with the photo-coupler input in resonant cavity of fibre-optical laser.Light is formed in microcavity
Arrowband echo wall die resonance spectrum, realizes the arrowband frequency-selecting in resonant cavity of fibre-optical laser.The present invention is shown using two-dimentional ultra-high magnifications
Micro-system (multiplication factor is up to 1900 times, resolution ratio up to 0.01 μm) and high precision position moving stage (precision reaches 20nm) control Microsphere Cavities and
The coupling distance and coupling position of conical fiber, effectively increase coupling efficiency, and the Q values of lifting system excite ultra-narrow band echo
Wall mould resonance spectrum, so that further compression laser output bandwidth, raising laser stability.
The features such as Microsphere Cavities of the present invention have high circularity, high symmetry, high-cleanness, high, can effectively suppress echo wall die and be total to
High-order mode in spectrum of shaking, improves resonance spectrum side mode suppression ratio, compresses resonance spectrum bandwidth, lifts resonance spectrum Q values, realizes that single-frequency is narrow
Band laser output.
The present invention realizes optical fiber laser using the echo wall die resonance spectrum in high circularity, the symmetrical Microsphere Cavities of three-dimensional rotation
Arrowband modeling, and the full light of high the circularity Microsphere Cavities and laser resonant cavity is realized in the pattern leakage for boring area by conical fiber
Fine, efficient coupling.The characteristics of Microsphere Cavities used have high circularity, high symmetry, high-cleanness, high.Conical fiber is caused by regulation
Critical Coupling state is in microballoon (i.e.：The coupling distance of microballoon and conical fiber is 0, and microballoon and conical fiber are under the line
Face is coupled), coupling unit Q parameters can be effectively improved, increases side mode suppression ratio, realizes the arrowband frequency-selecting of resonator, so that
Realize that narrow bandwidth laser is exported.The concrete technical scheme to the present invention is briefly described below.
Fig. 1 is the light schematic diagram that (α or β) is transmitted at different angles in Microsphere Cavities, and its frequency-selecting principle is as follows：
According to the law of refraction, when incidence angle is α：
n1Sin α=n2sinα0 (1)
In formula, n1For the refractive index of Microsphere Cavities, n2For air refraction, α0For refraction angle.Because the refractive index of Microsphere Cavities is big
In the refractive index of air, therefore when incidence angle meets α ＞ arcsin (n2/n1) when, light is carried out in Microsphere Cavities with total reflection mode
Transmit, the actual range of transmission one week is：
In formula, L is the optical transport actual range of one week, and R is the radius of Microsphere Cavities.It is only full when light is transmitted in microcavity
During sufficient following phase-matching condition, Whispering-gallery-mode resonance could be formed：
In formula, neffFor the effective refractive index of Microsphere Cavities, λ is resonant wavelength.(2) formula is substituted into (3) formula, can be obtained down
Formula：
4πneffRcos α/α=m λ (m round numbers) (4)
(3), (4) formula are analyzed to understand：
1st, resonant wavelength and the optical transport coverage of one week are relevant, only meet the wavelength of phase-matching condition and could produce
Raw Whispering-gallery-mode resonance, reaches the effect of frequency-selecting.
If the 2, the circularity of Microsphere Cavities is low, symmetry is poor, the actual range that light is transmitted along the different equatorial planes is different, causes not
With the generation of resonant wavelength, echo wall die transmission spectrum high-order mode is formed, is unfavorable for laser frequency-selecting.
3rd, echo wall die resonant wavelength is relevant with incident angle, therefore in order to suppress the generation of higher order mode, it is necessary to meet
Incident angle it is identical, i.e., conical fiber should be coupled in face under the line with high circularity Microsphere Cavities.
As shown in Fig. 2 the basic structure of single-frequency narrow band fiber laser of the present invention includes：Diode-end-pumped source 1,
Wavelength division multiplexer 2, optoisolator 3, rare-earth doped optical fibre 4, Polarization Controller 5, high circularity Microsphere Cavities-conical fiber coupling unit
6 and photo-coupler 7.All devices are connected with each other successively by way of fused fiber splice.E shown in figure1For incident light field strength
Degree, E2For distribution of light intensity in Microsphere Cavities, E3For outgoing distribution of light intensity.
Basic procedure prepared by Microsphere Cavities draws cone, cutting, heating including optical fiber, and basic skills is to utilize to be heated at high temperature optical fiber
One end, heated fiber end face forms spherical structure in the presence of surface tension.The circular symmetry of microballoon is better, and its light is in ball
The loss of intracavitary transmission is smaller, and photon lifetime is longer, i.e. Q values are higher.
Common is included by heating optical fiber using the method for surface tension formation microballoon：Arc discharge, high-power CO2Swash
The methods such as light device, oxyhydrogen flame heating.Arc discharge by optical fiber and sparking electrode relative position, discharge current, discharge time and
Discharge time influences, and diameter deviation is larger, and the microballoon circularity prepared is not high, symmetry is bad.Oxyhydrogen flame method cleanliness factor
Not high, the microsphere surface prepared is seriously polluted, adds microballoon cavity loss.Microballoon is by high-power tunable in the present invention
CO2What laser was thermally formed.Because CO2 lasers cleanliness factor is high, output beam spot size is accurately controlled, heat distribution
Uniformly, heating balling-up process stability is high, the characteristics of microballoon obtained has high circular symmetry, low-loss, high q-factor
It is illustrated in figure 3 symmetrical Microsphere Cavities and the contrast of asymmetric Microsphere Cavities equatorial plane sectional view.Fig. 3 a are high circularity, height is right
Title property microballoon；Fig. 3 b are low circularity, asymmetric microballoon.According to external diameter and ovality is surveyed in figure, (ovality is lower, circular symmetry
It is better) calculation formula：Ovality=(b-a)/c*100%, (b is maximum outside diameter, and a is minimum outer diameter, and c is nominal outside diameter, herein
Nominal outside diameter takes maximum outside diameter value) can be respectively 0.18% He in the hope of the ovality of symmetrical microballoon and asymmetric microballoon
1.31%.The ovality of symmetrical Microsphere Cavities is significantly less than asymmetric Microsphere Cavities, therefore circularity is high, and symmetry is good.
The microballoon that being illustrated in figure 4 microballoon and surface of the surface without abrasion by cleaning processing has abrasion is contrasted.Fig. 4 a
For treated clean microballoon；Fig. 4 b are microballoon defective.
According to the calculation formula of quality factor q (important parameter for weighing Microsphere Cavities)：
In formula, Q is the quality factor of Microsphere Cavities, QintFor the quality factor related to Microsphere Cavities internal loss, QextFor with
The related quality factor of Microsphere Cavities external losses, QradFor the quality factor related to Microsphere Cavities radiation loss, QabsFor with microballoon
The related quality factor of chamber absorption loss, QscaFor the quality factor related to Microsphere Cavities scattering loss.Above formula shows, the Echo Wall
The Q values of pattern Microsphere Cavities are relevant with absorption loss, scattering loss, when microsphere surface occurs wearing and tearing or has impurity, can to inhale
Loss, scattering loss increase are received, corresponding quality factor reduction causes the reduction of Microsphere Cavities quality factor.To sum up, using height
Cleanliness factor, without abrasion Microsphere Cavities be conducive to putting forward high q-factor, form ultra-narrow bandwidth echo wall die resonance spectrum, realize that single-frequency narrow bandwidth swashs
Light output.
It is illustrated in figure 5 under Critical Coupling (Fig. 5 a), undercoupling (Fig. 5 b) and overcoupling state (Fig. 5 c), high circularity is micro-
The pictorial diagram of spherical cavity-conical fiber coupling unit, couple state can be controlled by degree of regulation for 20nm coupling platform
System.
Conical fiber is illustrated in figure 6 in the Microsphere Cavities equatorial plane (Fig. 6 a) and the material object of the deviation Microsphere Cavities equatorial plane (Fig. 6 b)
Figure, adjusts vertical microscope and horizontal microscope, and optical fiber can be caused to be located at the microcavity equatorial plane.
It is illustrated in figure 7 the WGM Echo Walls for being coupled and being obtained with conical fiber with high symmetrical Microsphere Cavities and asymmetric Microsphere Cavities
Mode transmission is composed.The Whispering-gallery-mode transmission spectrum that com-parison and analysis experiment is drawn, has with the theory in Fig. 1 and preferably meets：With
Ovality for 0.18% high circularity, high symmetry Microsphere Cavities coupled with conical fiber when, can obtain in 1552.52nm
The light for having 22dB in place, conical fiber has been entered in Microsphere Cavities, and three dB bandwidth is only 0.1pm, and Q values can reach 1.55*106,
Corresponding side mode suppression ratio is 14.5dB；And coupled with ovality for 1.31% asymmetry microballoon with conical fiber
When, it can obtain at 1552.62nm, the light for having 19.9dB in conical fiber has been entered in Microsphere Cavities, three dB bandwidth is
0.18pm, Q value are 1.04*106, corresponding side mode suppression ratio is 7.3dB.Two compare, it can be deduced that conclusion；High circularity, height
Symmetry microballoon can significantly improve coupling efficiency, compression echo wall die resonance spectrum bandwidth, the Q values for improving system, increase side mould suppression
System ratio.
Conical fiber is illustrated in figure 8 in the microballoon equatorial plane and deviates the Whispering-gallery-mode obtained when the microballoon equatorial plane is coupled
Couple transmission spectrum.Obtained experimental result is consistent with the theory analysis in Fig. 1：, can when optical fiber deviates the equatorial plane of Microsphere Cavities
Substantially to find now to occur substantial amounts of higher order mode, Q values reduce, side mode suppression ratio reduction.
It is illustrated in figure 9 the Whispering-gallery-mode transmission spectrum obtained under Critical Coupling, undercoupling and overcoupling state.Phase
Than in the high-order mode under the coupling efficiency reduction under Critical Coupling state, undercoupling state, overcoupling state increasing, it is unfavorable for swashing
The efficient modeling of light.
Based on optical fiber laser structure figure as shown in Figure 2, Figure 10 is illustrated to be coupled with high circularity Microsphere Cavities-conical fiber
Unit realizes the spectrum test figure of the selection of annular optical fiber laser intracavitary single-frequency and bandwidth reduction.With the laser without frequency-selecting unit
Compare, high circularity Microsphere Cavities-conical fiber frequency-selecting unit effectively inhibits Mode-hopping Phenomena, and by laser 3dB output bandwidths by
0.03nm is compressed to 0.01nm, realizes that single-frequency laser of narrowband is exported.
The present invention from lifting Microsphere Cavities circularity, increase Microsphere Cavities symmetry, improve Microsphere Cavities cleanliness factor, find most
These aspects of good coupling position are improved, and experiment proves to effectively increase the output performance of laser.
Claims (5)
1. a kind of single-frequency narrow band fiber laser based on the high symmetrical microcavity of circularity three-dimensional rotation, including：Semiconductor laser pump
Pu source, wavelength division multiplexer, optoisolator, rare-earth doped optical fibre, Polarization Controller and photo-coupler, it is characterised in that also include
High circularity Microsphere Cavities-conical fiber coupling unit, diode-end-pumped source is connected through wavelength division multiplexer with optoisolator, and
It is connected by the output end of optoisolator with rare-earth doped optical fibre, the output end of rare-earth doped optical fibre passes sequentially through Polarization Control
Device, high circularity Microsphere Cavities-conical fiber coupling unit, photo-coupler, it is finally defeated with wavelength division multiplexer by optocoupler output
Enter the connected closure coelosis in end.
2. the single-frequency narrow band fiber laser according to claim 1 based on the high symmetrical microcavity of circularity three-dimensional rotation, it is special
Levy and be：High circularity Microsphere Cavities-conical fiber coupling unit is using two-dimentional ultra-high magnifications microscopic system and high precision position moving stage control
The coupling distance and coupling position of Microsphere Cavities and conical fiber processed.
3. the single-frequency narrow band fiber laser according to claim 1 based on the high symmetrical microcavity of circularity three-dimensional rotation, it is special
Levy and be：The characteristics of Microsphere Cavities have high circularity, high symmetry, high-cleanness, high, can effectively suppress echo wall die resonance spectrum
In high-order mode, improve resonance spectrum side mode suppression ratio, compress resonance spectrum bandwidth, lifted resonance spectrum Q values, realize single-frequency laser of narrowband
Output.
4. the single-frequency narrow band fiber laser based on the high symmetrical microcavity of circularity three-dimensional rotation described in a kind of utilization claim 1 enters
Arrowband frequency-selecting method in row resonator, it is characterised in that during frequency-selecting, incident light enters cone area from one end of conical fiber, passes through
Evanscent field is coupled into Microsphere Cavities, is transmitted with total reflection mode in the Microsphere Cavities equatorial plane, and forms ultra-narrow band echo wall die resonance
Spectrum, realizes the arrowband frequency-selecting in resonant cavity of fibre-optical laser.
5. arrowband frequency-selecting method according to claim 4, it is characterised in that：Conical fiber and Microsphere Cavities are under the line during frequency-selecting
Face is coupled, and coupling distance accurately controls Nano grade.
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Cited By (5)
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| CN108548795A (en) * | 2018-02-08 | 2018-09-18 | 中北大学 | A kind of humidity sensor based on Optical Microsphere type resonant cavity |
| CN109633821A (en) * | 2018-12-24 | 2019-04-16 | 暨南大学 | A kind of preparation method and microwave photon filter of microcavity coupled system |
| CN109687272A (en) * | 2019-03-01 | 2019-04-26 | 电子科技大学 | Er-doped microsphere laser device based on Microsphere Cavities feedback |
| CN109755850A (en) * | 2019-03-08 | 2019-05-14 | 江苏师范大学 | A kind of ultrafast fibre laser oscillator of middle infrared Raman based on microcavity |
| CN113507039A (en) * | 2021-05-13 | 2021-10-15 | 华东师范大学 | Single-mode micro laser based on single whispering gallery mode optical microcavity and implementation method |
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| CN101799608A (en) * | 2010-04-02 | 2010-08-11 | 上海交通大学 | Electric-control broadband photon radio-frequency phase shifter based on silicon-based micro-ring resonant cavity |
| CN104852259A (en) * | 2015-05-22 | 2015-08-19 | 哈尔滨工程大学 | Liquid drop whispering gallery mode laser and manufacturing method thereof |
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