CN108418086A - A kind of all -fiber high-order mode Brillouin optical fiber laser - Google Patents
A kind of all -fiber high-order mode Brillouin optical fiber laser Download PDFInfo
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- 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
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- 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
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- 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
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- H—ELECTRICITY
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- 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
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- H—ELECTRICITY
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- 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
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- 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
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
- H01S3/302—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects in an optical fibre
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Abstract
The invention discloses a kind of all -fiber high-order mode Brillouin optical fiber lasers, coupler is selected with ring cavity structure, including narrow linewidth pump laser, image intensifer, the first Polarization Controller, optical fiber circulator, the first fiber mode selection coupler, the second Polarization Controller, single mode optical fiber, less fundamental mode optical fibre and the second fiber mode；Wherein the first fiber mode selects coupler and the second fiber mode to select coupler for intracavity modal switching device, the M8003 line coupling of specific high-order mode in fundamental transverse mode and less fundamental mode optical fibre in single mode optical fiber may be implemented, Brillouin's non-linear gain based on less fundamental mode optical fibre in annular chamber, it realizes that higher order mode amplifies in the resonance of intracavitary, directly exports higher order mode laser.The high-order mode laser stability that the present invention exports is good, and mode purity is high, compact-sized using all optical fibre structure, at low cost, easily integrated with fibre system, improves the practicability and reliability of high-order mode laser.
Description
Technical field
The present invention relates to optical fiber laser, optical communication field, more particularly to a kind of all -fiber high-order mode Brillouin fiber optic swashs
Light device.
Background technology
High-order mode laser is with a wide range of applications, and draw due to its unique spatial-intensity, phase and polarisation distribution
The more and more interest of people are played.For example, in optical communication field, information is modulated in several different high-order modes, that is,
Pattern divides multiplexing technology, can significantly improve the transmission capacity in optic communication.In sensory field of optic fibre, high-order mode can reach more
High temperature and strain resolving accuracy.In addition, the vortex laser from high-order mode variation, in quantum and nanocomposite optical, optics
Manipulation, super-resolution imaging and laser material processing etc. have prodigious potentiality.
Under the promotion of these applications, researchers propose many methods to generate high-order mode laser.Currently, generating high
The laser of rank mould laser can substantially be divided into two classes：Volume elements part solid state laser and full-optical-fiber laser.Compared with the former, entirely
Optical fiber laser has many advantages, such as that at low cost, flexibility is good, stability is good, small, efficient.Realize full-optical-fiber laser
Critical component is efficient all -fiber pattern conversion or selector, including dislocation coupling technique, less fundamental mode optical fibre Prague light
Grid, long-period fiber grating and model selection coupler.The cloth of the conversion of these patterns or selector in full-optical-fiber laser
Office can be divided into two classes.The first kind, which is placed on the outside of resonant cavity, and grade is associated in the output of fundamental transverse mode (LP01) laser
In light path.Second class, the device are placed on the laser resonance intracavitary comprising single mode gain media.But strictly speaking, this two
Class laser is still the amplification of fundamental transverse mode resonance, rather than desired high-order mode resonance amplifies.In addition, because of the endless of device
Kind, both layouts also result in light beam power and quality degradation, and output high-order mode mode purity is low.Therefore, it realizes a kind of high
The method of efficiency, all -fiber and low cost has weight to obtain high-purity, high stability and compact-sized high-order mode laser
The meaning wanted.
Invention content
The shortcomings that it is an object of the invention to overcome the prior art and deficiency, provide a kind of all -fiber high-order mode Brillouin light
Fibre laser is realized intracavitary high-order mode resonance and put based on Brillouin's nonlinear effect using passive less fundamental mode optical fibre as gain media
Greatly, directly the high-order mode laser of height mode purity is obtained in laser output.In addition, the laser also have it is compact-sized,
The advantages of adjusting the aspects such as easy, cheap, stability is high.
The purpose of the present invention is realized by the following technical solution：A kind of all -fiber high-order mode Brillouin optical fiber laser,
Including：Narrow linewidth pump laser, image intensifer, the first Polarization Controller, optical fiber circulator, the selection coupling of the first fiber mode
Device, the second Polarization Controller, single mode optical fiber, less fundamental mode optical fibre and the second fiber mode select coupler；
Wherein, the optical fiber circulator is the three fiber ports annular equipped with first port, second port and third port
Device, the narrow linewidth pump laser are connected to image intensifer by single mode optical fiber, and the image intensifer passes through single mode optical fiber
It is connected to the first port of optical fiber circulator, the second port of the optical fiber circulator connects the first optical fiber mode by single mode optical fiber
Formula selects the first port of coupler, the third port of the optical fiber circulator to connect the choosing of the second fiber mode by single mode optical fiber
The first port of coupler is selected, the second port of the first fiber mode selection coupler is connected to second by less fundamental mode optical fibre
Fiber mode selects the second port of coupler, constitutes ring cavity structure；First Polarization Controller is added in image intensifer company
On the single mode optical fiber for connecing the first port of optical fiber circulator, second Polarization Controller is added in the selection coupling of the first fiber mode
The second port of device connects on the less fundamental mode optical fibre of the second port of the second fiber mode selection coupler；First fiber mode
The third port of coupler is selected to export laser.
Preferably, the narrow linewidth pump laser, the narrow linewidth semiconductor that C-band power adjustable can be selected humorous swash
Light device or narrow cable and wide optical fiber laser, line width are less than 1MHz.
Preferably, the image intensifer can select high-gain erbium-doped fiber amplifier or 1550nm wave band semiconductors
Image intensifer.
Preferably, the tail optical fiber of the optical fiber circulator, three ports is common communications single mode optical fiber, each port single-mode optics
Fine length range is 0.1m to 1m.
Preferably, the less fundamental mode optical fibre is 1550nm wave band less fundamental mode optical fibres, and the pattern count of support is more than 2 patterns, long
Degree is more than 20m.
Preferably, first fiber mode selection coupler and the second fiber mode select coupler, are single mode
Optical fiber and made from less fundamental mode optical fibre fused biconical taper 2 × 2 coupler, may be implemented the fundamental transverse mode in single mode optical fiber and less fundamental mode optical fibre
In M8003 line coupling between specific higher order mode, first and the 4th port be single mode optical fiber, second and third port are few mould
Optical fiber.
The optical fiber laser of the present invention is ring cavity structure, includes an optical fiber circulator and two optical fiber modes in annular chamber
Formula selects coupler and the single mode optical fiber and less fundamental mode optical fibre of connection, wherein two fiber mode selection couplers of connection lack
Mode fiber accounts for 99% or more entire annular chamber length.First fiber mode select coupler and the second fiber mode select coupler for
The M8003 line coupling of specific high-order mode in fundamental transverse mode and less fundamental mode optical fibre in single mode optical fiber may be implemented in intracavity modal switching device
It closes, based on the excited Brillouin non-linear gain of less fundamental mode optical fibre in annular chamber, realizes that higher order mode amplifies in the resonance of intracavitary,
The high-order mode Brillouin laser for stablizing high-purity is generated at room temperature.
Compared with prior art, the present invention having the following advantages that and advantageous effect：
1, the present invention selects coupler as laser resonator intracavity modal switching device using fiber mode, and loss is small,
It is efficient.
2, the present invention is based on Brillouin's non-linear gain, realize that the amplification of higher order mode intracavitary resonance, the high-order mode of acquisition swash
Optical mode purity is high.
3, the present invention is using the passive less fundamental mode optical fibre of general commercial as gain media, and it is convenient to obtain, use easy to spread.
4, the present invention uses all optical fibre structure, simple and compact for structure, at low cost, adjusts simplicity, is easy to fibre system and integrates,
Output laser stability is good, and line width improves the practicability and reliability of high-order mode laser.
Description of the drawings
Fig. 1 is the schematic diagram of embodiment all -fiber high-order mode Brillouin optical fiber laser.
Fig. 2 is laser power curve graph.
Fig. 3 is pumping laser and output Brillouin's Stokes laser light spectrogram.
Fig. 4 is output laser far field light intensity distributions figure.
In Fig. 1：1- narrow linewidth pump lasers；2- image intensifers；The first Polarization Controllers of 3-；4- optical fiber circulators；5-
First fiber mode selects coupler；The second Polarization Controllers of 6-；7- less fundamental mode optical fibres；The second fiber modes of 8- select coupler.
Specific implementation mode
Present invention will now be described in further detail with reference to the embodiments and the accompanying drawings, but embodiments of the present invention are unlimited
In this.
Embodiment 1
As shown in Figure 1, a kind of all -fiber high-order mode Brillouin optical fiber laser of this example, including：Narrow linewidth pumping swashs
Light device 1, image intensifer 2, the first Polarization Controller 3, optical fiber circulator 4, the first fiber mode selection coupler 5, second polarize
Controller 6, less fundamental mode optical fibre 7 and the second fiber mode select coupler 8.
The laser that narrow linewidth pump laser 1 exports carries out power amplification, amplified high power pump light by amplifier 2
The first port 401 of injection fibre circulator 4, then inject the selection of the first fiber mode from the second port 402 of optical fiber circulator 4
The first port 501 of coupler 5, after the first fiber mode selects coupler 5, pump light is by single-mode optics in first port 501
Fine fundamental transverse mode is changed into the specific high-order mode of less fundamental mode optical fibre in the second port 502 of the first fiber mode selection coupler 5, production
Raw high-order mode pump light selects the second port 502 of coupler 5 to inject in less fundamental mode optical fibre 7 through the first fiber mode.When light is put
When 2 amplified pumping light power of big device is more than the Brillouin threshold of less fundamental mode optical fibre 7, stimulated Brillouin scattering effect occurs,
Generate Brillouin's stokes light of inverted running.The Brillouin's stokes light generated in less fundamental mode optical fibre 7 is successively through the first light
The first port 501 of fine model selection coupler 5, the second port 402 of optical fiber circulator 4, the third port of optical fiber circulator 4
403, the second port of the first port 801 of the second fiber mode selection coupler 8 and the second fiber mode selection coupler 8
802 are again introduced into less fundamental mode optical fibre 7, and oscillation is formed in resonant cavity, that is, generating one moves down than pumping light frequency in single order cloth
Deep stokes light, this rank Brillouin stokes light select the third port 503 of coupler 5 to export through the first fiber mode.
The first Polarization Controller 3 between image intensifer 2 and the first port 401 of optical fiber circulator 4 and the first optical fiber mode
Formula selects the second polarization between the second port 502 of coupler 5 and the second port 802 of the second fiber mode selection coupler 8
The polarization state of controller 6 co- controlling pump light and Brillouin's pump light, to obtain maximum Brillouin's non-linear gain.
The first of narrow linewidth pump laser 1, image intensifer 2, optical fiber circulator 4, the first fiber mode selection coupler 5
Port 501 and the 4th port 504, the second fiber mode select the tail optical fiber of the first port 801 and the 4th port 804 of coupler 8
(connection optical fiber) is common communications single mode optical fiber.Due to the first fiber mode selection coupler 5 and the in optical fiber loop
Two fiber modes select coupler 8, and the orientation choosing of specific high-order mode in fundamental transverse mode and less fundamental mode optical fibre 7 in single mode optical fiber may be implemented
Select coupling, thus in less fundamental mode optical fibre 7 specific higher order mode will resonance amplification, to select coupler in the first fiber mode
5 third output end 503 obtains the high-order mode laser of height mode purity.
Narrow linewidth pump laser, the narrow linewidth semiconductor laser that C-band power adjustable can be selected humorous or narrow linewidth
Optical fiber laser, line width are less than 1MHz.
Image intensifer can select high-gain erbium-doped fiber amplifier or 1550nm wave band semiconductor optical amplifiers.
The tail optical fiber of optical fiber circulator, three ports is common communications single mode optical fiber, and each port single-mode optical fiber length is ranging from
0.1m to 1m.
Less fundamental mode optical fibre is 1550nm wave band less fundamental mode optical fibres, and the pattern count of support is more than 2 patterns, and length is more than 20m.
Embodiment 2
A kind of all -fiber high-order mode Brillouin optical fiber laser, structural schematic diagram are as shown in Figure 1.Narrow linewidth pump laser
1 uses 1550nm wave band narrow-line width single frequency optical fiber lasers, line width 10kHz, laser power 30mW.Image intensifer 2 uses
Commercial 1550nm wave bands semiconductor optical amplifier, amplifying power is up to 5W.Optical fiber circulator 4 is using commercial three port single mode optical fibers
Circulator.First fiber mode selects coupler 5 and the second fiber mode to select coupler 8 by common communications single mode optical fiber
SMF-28e and commercial two mode steps jump made from optical fiber fused tapering 2 × 2 coupler, LP01 moulds in single mode optical fiber to two moulds
The transfer efficiency of LP11 patterns is 90% in step optical fiber.Single mode optical fiber in light path is SMF-28e optical fiber.Two in annular chamber
The length of mould step optical fiber is 50m, single-mode optical fiber length 0.4m, therefore two mode steps jump fiber lengths accounting is 99.2%.The
It is 80: 20 that one fiber mode, which selects the first port 501 of coupler 5 and the splitting ratio of third port 503,.
When amplified pump laser power gradually increases to 780mW, Brillouin's Stokes in optic fiber ring-shaped cavity
Light generates resonance.Pump power continues to increase, and selects the third port of coupler to obtain stable laser in the first fiber mode
Output.Fig. 2 is laser power curve graph, and slope efficiency 15.6%, as pump power 3W, laser output power reaches
350mW.Fig. 3 is pumping laser and output Brillouin's Stokes laser light spectrogram, and the Brillouin laser of output is relative to pumping
The frequency displacement of 10.9GHz has occurred in light.Fig. 4 is that the LP11 patterns for selecting the third port 503 of coupler 5 to export in first mode swash
Light far field light intensity distributions figure.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, it is other it is any without departing from the spirit and principles of the present invention made by changes, modifications, substitutions, combinations, simplifications,
Equivalent substitute mode is should be, is included within the scope of the present invention.
Claims (7)
1. a kind of all -fiber high-order mode Brillouin optical fiber laser, which is characterized in that including：Narrow linewidth pump laser, light are put
Big device, the first Polarization Controller, optical fiber circulator, the first fiber mode selection coupler, the second Polarization Controller, single-mode optics
Fine, less fundamental mode optical fibre and the second fiber mode select coupler；
Wherein, the optical fiber circulator is the three fiber port circulators equipped with first port, second port and third port, institute
The narrow linewidth pump laser stated is connected to image intensifer by single mode optical fiber, and the image intensifer is connected to by single mode optical fiber
The second port of the first port of optical fiber circulator, the optical fiber circulator connects the selection of the first fiber mode by single mode optical fiber
The third port of the first port of coupler, the optical fiber circulator connects the selection coupling of the second fiber mode by single mode optical fiber
The second port of the first port of device, the first fiber mode selection coupler is connected to the second optical fiber mode by less fundamental mode optical fibre
Formula selects the second port of coupler, constitutes ring cavity structure；First Polarization Controller is added in image intensifer connection optical fiber
On the single mode optical fiber of the first port of circulator, second Polarization Controller is added in the of the first fiber mode selection coupler
Two-port netwerk connects on the less fundamental mode optical fibre of the second port of the second fiber mode selection coupler；First fiber mode selects coupling
The third port of clutch exports laser.
2. all -fiber high-order mode Brillouin optical fiber laser according to claim 1, which is characterized in that the narrow linewidth
Pump laser, the narrow linewidth semiconductor laser or narrow cable and wide optical fiber laser for selecting C-band power adjustable humorous, line width are less than
1MHz。
3. all -fiber high-order mode Brillouin optical fiber laser according to claim 1, which is characterized in that the light amplification
Device selects high-gain erbium-doped fiber amplifier or 1550nm wave band semiconductor optical amplifiers.
4. all -fiber high-order mode Brillouin optical fiber laser according to claim 1, which is characterized in that the fiber optic loop
The tail optical fiber of shape device, three ports is common communications single mode optical fiber, each port single-mode optical fiber length ranging from 0.1m to 1m.
5. all -fiber high-order mode Brillouin optical fiber laser according to claim 1, which is characterized in that few mould light
Fibre is 1550nm wave band less fundamental mode optical fibres, and the pattern count of support is more than 2 patterns, and length is more than 20m.
6. all -fiber high-order mode Brillouin optical fiber laser according to claim 1, which is characterized in that first light
Fine model selection coupler and the second fiber mode select coupler, are made from single mode optical fiber and less fundamental mode optical fibre fused biconical taper
The M8003 line coupling between specific higher order mode in the fundamental transverse mode and less fundamental mode optical fibre in single mode optical fiber may be implemented in 2 × 2 coupler
Close, first and the 4th port be single mode optical fiber, second and third port be less fundamental mode optical fibre.
7. all -fiber high-order mode Brillouin optical fiber laser according to claim 1, which is characterized in that all -fiber high-order mode
Brillouin optical fiber laser is annular cavity laser, wherein the less fundamental mode optical fibre of two fiber mode selection couplers of connection accounts for entirely
99% or more annular chamber length.
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| CN109066279A (en) * | 2018-09-07 | 2018-12-21 | 华南理工大学 | A kind of all -fiber vortex light laser based on orbital angular momentum mode resonances |
| CN112117629A (en) * | 2020-09-23 | 2020-12-22 | 上海大学 | All-fiber high-order mode Brillouin erbium-doped laser based on acousto-optic device |
| CN112134131A (en) * | 2019-06-25 | 2020-12-25 | 安徽天琢激光科技有限公司 | Double-arm structure annular light spot output continuous optical fiber laser |
| CN114069377A (en) * | 2021-11-17 | 2022-02-18 | 上海大学 | Mode control system based on acousto-optic device |
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| CN112134131A (en) * | 2019-06-25 | 2020-12-25 | 安徽天琢激光科技有限公司 | Double-arm structure annular light spot output continuous optical fiber laser |
| CN112117629A (en) * | 2020-09-23 | 2020-12-22 | 上海大学 | All-fiber high-order mode Brillouin erbium-doped laser based on acousto-optic device |
| CN114069377A (en) * | 2021-11-17 | 2022-02-18 | 上海大学 | Mode control system based on acousto-optic device |
| CN114069377B (en) * | 2021-11-17 | 2023-12-26 | 上海大学 | Mode control system based on acousto-optic device |
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