CN209401973U - A kind of optical fiber laser that can directly export short pulse vortex light - Google Patents
A kind of optical fiber laser that can directly export short pulse vortex light Download PDFInfo
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- CN209401973U CN209401973U CN201920419450.2U CN201920419450U CN209401973U CN 209401973 U CN209401973 U CN 209401973U CN 201920419450 U CN201920419450 U CN 201920419450U CN 209401973 U CN209401973 U CN 209401973U
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- optical fiber
- mode
- coupler
- single mode
- polarization controller
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Abstract
The utility model discloses a kind of optical fiber lasers that can directly export short pulse vortex light.The utility model constitutes nonlinear amplified loop mirror using gain fibre, single mode optical fiber and the first Polarization Controller, and nonlinear amplified loop mirror, monomode coupler, the second Polarization Controller and unpolarized dependence isolator constitute laser cavity, forms mode locking；Then mode selector of the single mode to few mould is put into laser cavity, it assumes responsibility for beam splitting output laser while can be coupled out high-order mode output；When pump power is 270 milliwatt, it can directly generate 13 milliwatts and pulsewidth is the vortex light of 393 femtoseconds；The utility model is compact-sized, and required device is simple, at low cost, easy-to-use.
Description
Technical field
The utility model relates to optical fiber lasers, and in particular to a kind of optical-fiber laser that can directly export short pulse vortex light
Device.
Background technique
Generating short pulse in a fiber can rely on tune Q or mode locking, and the repetition rate of mode locking is stable and pulse width is shorter.
The core of the mode of mode locking is saturable absorption mechanism, and the mode for having this mechanism has nonlinear polarization rotation, saturable
Absorbing material, semiconductor absorbing mirror, nonlinear loop mirror etc..High-order mode is generated in less fundamental mode optical fibre can be by long period light
The energy of basic mode is transformed into high-order mode by grid, but this is needed outside chamber plus grating realizes conversion, slightly aobvious complexity.
Summary of the invention
For the above problems of the prior art, the utility model proposes a kind of short pulses that can directly export to be vortexed
The optical fiber laser of light, by the chamber containing nonlinear amplified loop mirror in conjunction with model selection coupler, the former can generate mode locking
Pulse, the latter is as mode selector.
The optical fiber laser that short pulse vortex light can directly be exported of the utility model include: pumping source, wavelength division multiplexer,
Gain fibre, single mode optical fiber, the first and second Polarization Controllers, monomode coupler, single mode are to few mode coupler, unpolarized dependence
Isolator, less fundamental mode optical fibre and Polarization Controller；Wherein, pumping source is connected to the first port of wavelength division multiplexer；Wavelength division multiplexer
Second port connect gain fibre；Gain fibre connects single mode optical fiber；Single mode optical fiber connects the first Polarization Controller；First partially
The controller that shakes connects the first end of monomode coupler；The input terminal of the second end connection wavelength division multiplexer of monomode coupler；Gain
Optical fiber, single mode optical fiber and the first Polarization Controller constitute nonlinear amplified loop mirror；The third end of monomode coupler connects single mode
To few mode coupler input terminal；Single mode connects unpolarized dependence isolator to the single mode end of few mode coupler；It is unpolarized rely on every
The second Polarization Controller is connected from device；4th end of the second Polarization Controller connection monomode coupler；Single mode is to few mode coupler
Few mould end Polarization Controller is connected by less fundamental mode optical fibre.
Pumping source issue laser input wavelength division multiplexer first port, from the first port of wavelength division multiplexer export to
Gain fibre amplification, until single mode optical fiber, the length of nonlinear amplified loop mirror is controlled by the length of single mode optical fiber；Partially through first
The variation of the polarization state of the light of the vibration birefringent generation of controller compensation；First port through monomode coupler, from monomode coupler
Third port input unpolarized dependence isolator is entered to few mode coupler through single mode, unpolarized dependence isolator makes light unidirectional
Operation guarantees mode locking stability；The polarization state variation generated using the same compensated birefringence of the second Polarization Controller；From single mode
4th port of coupler inputs, and exports respectively from the first and second ports of monomode coupler, respectively clockwise and anticlockwise
After nonlinear amplified loop mirror, then the first and second ports of monomode coupler are input to, this time is in monomode coupler
Coupled zone coherent superposition so that the transmitance of light changes with intensity and generates pulse；From the third port of monomode coupler
Output is to single mode to few mode coupler, and single mode carries out mode conversion to few mode coupler, and part energy is as output, from single mode
Few mould end output to few mode coupler, is transmitted to Polarization Controller through less fundamental mode optical fibre, is converted to vortex light.
Pumping source uses laser diode.
Gain fibre uses high-concentration dopant gain media optical fiber, is Er-doped fiber, Yb dosed optical fiber and erbium-ytterbium co-doped fiber
One of.
Controlling the length of nonlinear amplified loop mirror by the length of single mode optical fiber, the length of single mode optical fiber is 10~
100m。
Single mode refers to energy less than 80% the part energy of few mode coupler exported from few mould end.
The coupling ratio of monomode coupler is 4:6~6:4, and coupling ratio refers to the export ratio of first port and second port.
Single mode is to few mode coupler tool there are two output end, respectively single mode end and few mould end, and few mould end is as energy output end, single mode
Coupling ratio to few mode coupler is 80% hereinafter, coupling ratio refers to the ratio at few mould end and single mode end output power.
The advantages of the utility model:
The utility model constitutes nonlinear amplified loop mirror using gain fibre, single mode optical fiber and the first Polarization Controller,
Nonlinear amplified loop mirror, monomode coupler, the second Polarization Controller and unpolarized dependence isolator constitute laser cavity, form lock
Mould；Then mode selector of the single mode to few mould is put into laser cavity, it assumes responsibility for beam splitting output laser can couple simultaneously
High-order mode exports out；When pump power is 270 milliwatt, it can directly generate 13 milliwatts and pulsewidth is the vortex light of 393 femtoseconds；
The utility model is compact-sized, and required device is simple, at low cost, easy-to-use.
Detailed description of the invention
Fig. 1 is the optical path of one embodiment of the optical fiber laser that can directly export short pulse vortex light of the utility model
Figure；
Fig. 2 is the output of one embodiment of the optical fiber laser that can directly export short pulse vortex light of the utility model
Schematic diagram, wherein (a) is the pulse train of output, (b) pulse width to be measured using autocorrelation function analyzer；
Fig. 3 is the output of one embodiment of the optical fiber laser that can directly export short pulse vortex light of the utility model
Pattern, wherein (a) and (b) is the mould field pattern exported respectively, it (c) and (d) is respectively to be generated using with reference beam interference
Pattern.
Specific embodiment
With reference to the accompanying drawing, by specific embodiment, the utility model is further described.
As shown in Figure 1, the optical fiber laser that can directly export short pulse vortex light of the present embodiment includes: pumping source 1, wave
Division multiplexer 2, gain fibre 3, single mode optical fiber 4, the first and second Polarization Controllers 51 and 52, monomode coupler 6, single mode are to few
Mode coupler 8, unpolarized dependence isolator 7, less fundamental mode optical fibre 9 and Polarization Controller 10；Wherein, it is multiple to be connected to wavelength-division for pumping source 1
With the first port 21 of device；The second port 22 of wavelength division multiplexer connects gain fibre；Gain fibre connects single mode optical fiber；Single mode
Optical fiber connects the first Polarization Controller；The first end 61 of first Polarization Controller connection monomode coupler；The of monomode coupler
The third end 23 of two ends 62 connection wavelength division multiplexer；Gain fibre, single mode optical fiber and the first Polarization Controller constitute non-linear put
Big annular mirror；The third end 63 of monomode coupler connects single mode to few mode coupler input terminal 82；Single mode is to few mode coupler
Single mode end 83 connects unpolarized dependence isolator；Unpolarized dependence isolator connects the second Polarization Controller；Second Polarization Control
4th end 64 of device connection monomode coupler；Single mode connects Polarization Control by less fundamental mode optical fibre to few mould end 81 of few mode coupler
Device.
In the present embodiment, pumping source 1 is adopted as 980 nm laser diodes；Gain fibre 3 uses high concentration er-doped light
It is fine；The length of single mode optical fiber 4 is 100m；First and second Polarization Controllers 51 and 52 use tricyclic Polarization Controller；Single mode coupling
The coupling ratio of clutch 6 is 5:5；Single mode is 2:8 to the coupling ratio of few mode coupler 8, has 20% energy to be used as output.
980 nanometer lasers that pumping source issues input wavelength division multiplexer, amplify through gain fibre, using 100 meters of list
Mode fiber；The variation of the polarization state of the light generated through the first Polarization Controller compensated birefringence；Through as saturable absorber
Monomode coupler enters unpolarized dependence isolator to few mode coupler through single mode；Unpolarized dependence isolator allows light unidirectionally to transport
Row guarantees mode locking stability；The polarization state variation generated using the same compensated birefringence of the second Polarization Controller；From single mode coupling
4th port of clutch inputs, and exports from the first and second ports of monomode coupler, passes through clockwise and anticlockwise respectively respectively
It after crossing nonlinear amplified loop mirror, then is input to the first and second ports of monomode coupler and is exported from third port, at this time
The transmitance of monomode coupler changes with luminous intensity, generates pulse.It exports from the third port of monomode coupler to single mode
To few mode coupler, single mode is converted into higher order mode LP11 to few mode coupler, and 20% energy is as output, from single mode to few
The first end of mode coupler exports, and is transmitted to Polarization Controller through less fundamental mode optical fibre, is converted to vortex light.The optical fiber of the present embodiment swashs
Shown in pulse train such as Fig. 2 (a) of light device output, shown in pulse width such as Fig. 2 (b) using autocorrelation function analyzer measurement.Vortex light
Topological charge be respectively 1 and when -1, the mould field pattern of optical fiber laser output, respectively as shown in Fig. 3 (a) and (b)；Vortex light
When topological charge is respectively 1 and -1, using the pattern generated with reference beam interference, respectively as shown in Fig. 3 (c) and (d).
It is finally noted that the purpose for publicizing and implementing example is to help to further understand the utility model, but originally
The technical staff in field is understood that in the spirit and scope for not departing from the utility model and the attached claims, various
Substitutions and modifications are all possible.Therefore, the utility model should not be limited to embodiment disclosure of that, and the utility model is wanted
Seek the range of protection subject to the scope defined in the claims.
Claims (6)
1. a kind of optical fiber laser that can directly export short pulse vortex light, which is characterized in that described directly to export short pulse
The optical fiber laser of vortex light includes: pumping source, wavelength division multiplexer, gain fibre, single mode optical fiber, the first and second Polarization Controls
Device, monomode coupler, single mode are to few mode coupler, unpolarized dependence isolator, less fundamental mode optical fibre and Polarization Controller；Wherein, institute
State the first port that pumping source is connected to wavelength division multiplexer；The second port of the wavelength division multiplexer connects gain fibre；It is described
Gain fibre connects single mode optical fiber；The single mode optical fiber connects the first Polarization Controller；The first Polarization Controller connection is single
The first end of mode coupler；The input terminal of the second end connection wavelength division multiplexer of the monomode coupler；The gain fibre, list
Mode fiber and the first Polarization Controller constitute nonlinear amplified loop mirror；The third end connection single mode of the monomode coupler is to few
Mode coupler input terminal；The single mode connects unpolarized dependence isolator to the single mode end of few mode coupler；It is described it is unpolarized according to
Isolator is relied to connect the second Polarization Controller；4th end of the second Polarization Controller connection monomode coupler；The single mode
Polarization Controller is connected by less fundamental mode optical fibre to few mould end of few mode coupler.
2. can directly export the optical fiber laser of short pulse vortex light as described in claim 1, which is characterized in that the pumping
Source uses laser diode.
3. can directly export the optical fiber laser of short pulse vortex light as described in claim 1, which is characterized in that the gain
Optical fiber is using one of Er-doped fiber, Yb dosed optical fiber and erbium-ytterbium co-doped fiber.
4. can directly export the optical fiber laser of short pulse vortex light as described in claim 1, which is characterized in that the single mode
The length of optical fiber is 10~100m.
5. can directly export the optical fiber laser of short pulse vortex light as described in claim 1, which is characterized in that the single mode
The coupling ratio of coupler is 4:6~6:4.
6. can directly export the optical fiber laser of short pulse vortex light as described in claim 1, which is characterized in that the single mode
Coupling ratio to few mode coupler is 80% or less.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920419450.2U CN209401973U (en) | 2019-03-29 | 2019-03-29 | A kind of optical fiber laser that can directly export short pulse vortex light |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920419450.2U CN209401973U (en) | 2019-03-29 | 2019-03-29 | A kind of optical fiber laser that can directly export short pulse vortex light |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111244739A (en) * | 2020-01-20 | 2020-06-05 | 江苏师范大学 | Scalar soliton rain laser and scalar soliton rain generation method |
-
2019
- 2019-03-29 CN CN201920419450.2U patent/CN209401973U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111244739A (en) * | 2020-01-20 | 2020-06-05 | 江苏师范大学 | Scalar soliton rain laser and scalar soliton rain generation method |
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Granted publication date: 20190917 Termination date: 20200329 |