CN206524515U - 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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- CN206524515U CN206524515U CN201720169051.6U CN201720169051U CN206524515U CN 206524515 U CN206524515 U CN 206524515U CN 201720169051 U CN201720169051 U CN 201720169051U CN 206524515 U CN206524515 U CN 206524515U
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- 238000005859 coupling reaction Methods 0.000 claims abstract description 43
- 239000013307 optical fiber Substances 0.000 claims abstract description 29
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- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 13
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Abstract
The utility model 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 utility model 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 utility model belongs to fiber laser technology field, is related to a kind of based on the high symmetrical microcavity of circularity three-dimensional rotation
Single-frequency 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.
Utility model content
The utility model is directed to the cost of manufacture height of prior art presence, stability is poor, compactedness is low, output bandwidth is big etc.
A kind of shortcoming, 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 carry out frequency-selecting using high circularity Microsphere Cavities-conical fiber coupling unit, in high circularity, the symmetrical microcavity of three-dimensional rotation
Ultra-narrow band echo wall die resonance spectrum (three dB bandwidth reaches 1pm) is excited, the deep compression of optical fiber laser output bandwidth is realized, and had
Have high stability, low cost, it is simple in construction the features such as.In addition, the utility model also uses two-dimentional superhigh precision coupled system, with
Nano-precision controls the coupling distance and coupling position of conical fiber and Microsphere Cavities, further improves the Q of microcavity coupled system
Value, compression echo wall die resonance spectrum bandwidth, reduction high-order mode, increase side mode suppression ratio, compression laser bandwidth, lifting are stable
Property.
The utility model is in order to solve the above technical problems, the technical solution of the utility model is that the single-frequency narrow bandwidth optical fiber is sharp
Light device includes diode-end-pumped source, wavelength division multiplexer, optoisolator, rare-earth doped optical fibre, Polarization Controller and light
Coupler, in addition to high circularity Microsphere Cavities-conical fiber coupling unit, diode-end-pumped source is through wavelength division multiplexer and light
Isolator is connected, and is connected by the output end of optoisolator with rare-earth doped optical fibre, and the output end of rare-earth doped optical fibre is successively
By Polarization Controller, high circularity Microsphere Cavities-conical fiber coupling unit, photo-coupler, finally by optocoupler output with
Wavelength division multiplexer 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.
Compared with the prior art, the utility model has the advantages that：
1st, the utility model carries out frequency-selecting using high circularity Microsphere Cavities-conical fiber coupling unit, and contained high circularity, height are right
The ultra-narrow bandwidth echo wall die resonance spectrum (three dB bandwidth is about 1pm) formed in title property, high-cleanness, high Microsphere Cavities causes output laser
There is ultra-narrow bandwidth.
2nd, the utility model is using two-dimentional ultra-high magnifications microscopic system and high precision position moving stage control Microsphere Cavities and cone of light
Fine coupling distance and position, precision effectively increase coupling efficiency up to Nano grade, excite ultra-narrow band echo wall die to resonate
Spectrum, further compresses laser output bandwidth and improves laser stability.
3rd, the utility model laser is built using all-fiber devices and realizes arrowband frequency-selecting, good, stably with coherence
Property height, 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 the high circularity of the utility model, the structure of the single frequency optical fiber laser of the symmetrical microcavity frequency-selecting of three-dimensional rotation ball is shown
It is intended to.
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
The technical solution of the utility model is described in detail with reference to Figure of description.The utility model proposes
Optical fiber laser, its structure includes：Diode-end-pumped source, wavelength division multiplexer, optoisolator, rare-earth doped optical fibre, partially
Shake controller, high circularity Microsphere Cavities-conical fiber coupling unit and photo-coupler；The diode-end-pumped source is through ripple
Division multiplexer is connected with optoisolator, and is connected by the output end of optoisolator with rare-earth doped optical fibre, and rear-earth-doped is defeated
Go out end and pass sequentially through Polarization Controller, high symmetrical Microsphere Cavities-conical fiber frequency-selecting unit, photo-coupler, finally by photo-coupler
Output end is connected with wavelength division multiplexer input closes coelosis.
High circularity Microsphere Cavities-conical fiber frequency-selecting unit is provided with resonant cavity of fibre-optical laser of the present utility model：It is incident
Light enters cone area from one end of conical fiber, Microsphere Cavities is coupled into by evanscent field, with total reflection mode in Microsphere Cavities equator
Face is transmitted, then is connected by the conical fiber other end with the photo-coupler input in resonant cavity of fibre-optical laser.Light is in microcavity
Arrowband echo wall die resonance spectrum is formed, the arrowband frequency-selecting in resonant cavity of fibre-optical laser is realized.The utility model is super using two dimension
High magnification microscopic 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
The coupling distance and coupling position of Microsphere Cavities and conical fiber, effectively increase coupling efficiency, and the Q values of lifting system are excited super
Arrowband echo wall die resonance spectrum, so that further compression laser output bandwidth, raising laser stability.
The features such as Microsphere Cavities of the present utility model have high circularity, high symmetry, high-cleanness, high, can effectively suppress the Echo Wall
High-order mode in mould resonance spectrum, improves resonance spectrum side mode suppression ratio, compresses resonance spectrum bandwidth, lifts resonance spectrum Q values, realizes single-frequency
Laser of narrowband is exported.
The utility model realizes optical-fiber laser using the echo wall die resonance spectrum in high circularity, the symmetrical Microsphere Cavities of three-dimensional rotation
The arrowband modeling of device, and high the circularity Microsphere Cavities and laser resonant cavity are realized in the pattern leakage for boring area by conical fiber
All -fiber, efficient coupling.The characteristics of Microsphere Cavities used have high circularity, high symmetry, high-cleanness, high.Taper is caused by regulation
Optical fiber is in Critical Coupling state (i.e. with microballoon：The coupling distance of microballoon and conical fiber is 0, and microballoon exists with conical fiber
The equatorial plane is coupled), coupling unit Q parameters can be effectively improved, increases side mode suppression ratio, realizes the arrowband frequency-selecting of resonator,
So as to realize that narrow bandwidth laser is exported.Concrete technical scheme of the present utility model 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 is metWhen, light is entered in Microsphere Cavities with total reflection mode
Row is transmitted, and 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 the utility model single-frequency narrow band fiber laser 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 intensity, 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.In the utility model microballoon be by it is high-power can
Tune CO2What laser was thermally formed.Because CO2 lasers cleanliness factor is high, output beam spot size is accurately controlled, heat
It is evenly distributed, 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 noble and unsullied
Cleanliness, without abrasion Microsphere Cavities be conducive to putting forward high q-factor, form ultra-narrow bandwidth echo wall die resonance spectrum, realize single-frequency narrow bandwidth laser
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 utility model from lifting Microsphere Cavities circularity, increase Microsphere Cavities symmetry, improve Microsphere Cavities cleanliness factor, seek
These aspects of Best Coupling position are looked for be improved, experiment proves to effectively increase the output performance of laser.
Claims (3)
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.
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| CN201720169051.6U CN206524515U (en) | 2017-02-24 | 2017-02-24 | A kind of single-frequency narrow band fiber laser based on the high symmetrical microcavity of circularity three-dimensional rotation |
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| CN201720169051.6U CN206524515U (en) | 2017-02-24 | 2017-02-24 | A kind of single-frequency narrow band fiber laser based on the high symmetrical microcavity of circularity three-dimensional rotation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107046221A (en) * | 2017-02-24 | 2017-08-15 | 南京邮电大学 | A kind of single-frequency narrow band fiber laser based on the high symmetrical microcavity of circularity three-dimensional rotation |
| CN108801851A (en) * | 2018-05-25 | 2018-11-13 | 南京邮电大学 | A kind of micro liquid concentration sensor of thin-walled column symmetry microcavity |
-
2017
- 2017-02-24 CN CN201720169051.6U patent/CN206524515U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107046221A (en) * | 2017-02-24 | 2017-08-15 | 南京邮电大学 | A kind of single-frequency narrow band fiber laser based on the high symmetrical microcavity of circularity three-dimensional rotation |
| CN108801851A (en) * | 2018-05-25 | 2018-11-13 | 南京邮电大学 | A kind of micro liquid concentration sensor of thin-walled column symmetry microcavity |
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