CN204190153U - A kind of all-fiber mode-locked laser based on multimode interference couplers Kerr effect - Google Patents
A kind of all-fiber mode-locked laser based on multimode interference couplers Kerr effect Download PDFInfo
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- CN204190153U CN204190153U CN201420706188.7U CN201420706188U CN204190153U CN 204190153 U CN204190153 U CN 204190153U CN 201420706188 U CN201420706188 U CN 201420706188U CN 204190153 U CN204190153 U CN 204190153U
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Abstract
The utility model discloses a kind of all-fiber mode-locked laser based on multimode interference couplers Kerr effect, pumping source launches the pump light in Active Optical Fiber absorption band, and pump light is coupled into Active Optical Fiber through signal pump combiner; Active Optical Fiber absorptive pumping light, forms population inversion, produces laser gain; Multimode interference couplers is made up of welding one section of multimode fiber in the middle of two section single-mould fibers, and the transmission peaks of multimode fiber is consistent with the gain peak of Active Optical Fiber; Signal pump combiner, Active Optical Fiber, multimode interference couplers, output coupler, isolator arrange welding in turn, form unidirectional loop laser resonance cavity; Under the effect of laser, multimode fiber refractive index changes, and multiple-mode interfence changes from the position of photosites, and multimode fiber changes in the transmitance of laser wave strong point, forms modulating action to the laser intensity of loop laser resonance cavity; Output coupler exports ultra-short pulse laser.The utility model improves laser output power, with low cost.
Description
Technical field
The utility model relates to field of lasers, particularly relates to a kind of all-fiber mode-locked laser based on multimode interference couplers Kerr effect.
Background technology
Ultrafast mode-locked laser has a wide range of applications in basic research, medical science, national defence and industrial processes.Because fiber laser has the many advantages such as compact conformation, efficient, firm and high performance-price ratio, the mode locked fiber laser of various working stability, compact conformation is developed out.Relative active mode locking, the fiber laser of passive mode locking has obvious advantage in all many-sides, such as: the response of saturable absorber or Kerr-type device and recovery time are general all very short, therefore the pulse duration that produces of passive mode locking is usually narrow than active mode locking; Without the need to spatial light modulator and corresponding electronic equipment, thus structure is more simply compact; Also the impact of electrical noise in modulator can not be subject to.
Existing passive mode-locking fiber laser mainly relies on saturable absorption device to realize, as patent " passive mode-locking fiber laser that double-wavelength short pulse exports " (ZL 200910029722.9) and " Graphene passive mode-locking fiber laser " (ZL201110101110.3) etc.A distinct disadvantage of this type of passive mode-locking fiber laser is, saturable absorption device used, as semiconductor saturable absorbing mirror (SESAM), carbon nano-tube and Graphene etc., damage threshold is general lower, therefore, it is possible to the average output power produced is limited in the magnitude of several to dozens of mW, more high-power Mode-locked laser can only obtain by fiber amplifier, adds the complexity of system.
Utility model content
The utility model provides a kind of all-fiber mode-locked laser based on multimode interference couplers Kerr effect, and the utility model improves laser output power, with low cost, achieves the simple high power mode locked fiber laser of structure, described below:
Based on an all-fiber mode-locked laser for multimode interference couplers Kerr effect, described all-fiber mode-locked laser comprises: pumping source, also comprises: signal pump combiner, Active Optical Fiber, multimode interference couplers, output coupler and isolator,
Described pumping source launches the pump light in Active Optical Fiber absorption band, and described pump light is coupled into described Active Optical Fiber through described signal pump combiner; Described Active Optical Fiber absorptive pumping light, forms population inversion, produces laser gain; Described multimode interference couplers is made up of welding one section of multimode fiber in the middle of two section single-mould fibers, and the transmission peaks of described multimode fiber is consistent with the gain peak of described Active Optical Fiber;
Described signal pump combiner, described Active Optical Fiber, described multimode interference couplers, described output coupler, described isolator arrange welding in turn, form unidirectional loop laser resonance cavity.
Described all-fiber mode-locked laser also comprises: tunable optic filter,
After described tunable optic filter is arranged on described output coupler; Described tunable optic filter is used for transmission peaks place laser oscillation wavelength being limited in described multimode fiber.
The beneficial effect of the technical scheme that the utility model provides is: utilize the Kerr effect of multimode interference couplers to realize the passive mode locking running of fiber laser, the realization for mode-locked ultrashort pulse laser provides a kind of new way.Compared with the saturable absorption mode-locking device such as the SESAM adopted with existing passive mode-locking fiber laser, Graphene, the damage threshold of technical solutions of the utility model multimode interference couplers used is very high, thus contributes to improving laser output power; And the structure of multimode interference couplers is simple, with low cost, be conducive to actual applying.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of all-fiber mode-locked laser based on multimode interference couplers Kerr effect;
Fig. 2 is the structural representation of multimode interference couplers.
In accompanying drawing, the list of parts representated by each label is as follows:
1: pumping source; 2: signal pump combiner;
3: Active Optical Fiber; 4: multimode interference couplers;
5: output coupler; 6: isolator;
7: tunable optic filter;
4-1: monomode fiber 4-2: multimode fiber.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly, below the utility model execution mode is described in further detail.
With adopting the laser with active-passive lock mould of saturable absorber to compare in prior art, the mode locked fiber laser based on Kerr effect can obtain higher power output; In addition, owing to there is electron cloud metaboly in glass, glass can realize the extremely fast nonlinear response time, and thus Kerr-type laser with active-passive lock mould can provide shorter output pulse width.
Embodiment 1
Low in order to solve saturable absorption locked mode element damage threshold value in existing passive mode-locking fiber laser, the problem of restriction laser output power, see Fig. 1, the utility model embodiment provides a kind of all-fiber mode-locked laser based on multimode interference couplers Kerr effect, all-fiber mode-locked laser comprises: pumping source 1, signal pump combiner 2, Active Optical Fiber 3, multimode interference couplers 4, output coupler 5 and isolator 6
Pumping source 1 launches the pump light in the absorption band of Active Optical Fiber 3, and pump light enters Active Optical Fiber 3 through signal pump combiner coupling 2; Active Optical Fiber 3 absorptive pumping light, forms population inversion, produces laser gain; Multimode interference couplers 4 is that two weldings in the middle of section single-mould fibers, one section of multimode fiber is formed, and its transmission peaks is consistent with the gain peak of Active Optical Fiber 3, namely multimode fiber length used and corresponding optical maser wavelength from photosites position consistency.Signal pump combiner 2, Active Optical Fiber 3, multimode interference couplers 4, output coupler 5, isolator 6 arrange welding in turn, form unidirectional loop laser resonance cavity.
Along with pump power increases, after laser gain exceedes loss, in chamber, produce laser; Under the effect of laser, due to Kerr effect, in multimode interference couplers 4, multimode fiber refractive index changes; By the impact of variations in refractive index, its multiple-mode interfence changes from the position of photosites, and namely the transmission spectrum of device produces mobile, and device changes in the transmitance of laser wave strong point, and the change of transmitance constitutes modulating action for the laser intensity in chamber.When all-fiber mode-locked laser is operated in Near Threshold, all-fiber mode-locked laser with from pulse running, also just can be formed periodic modulation, thus starts locked mode.The ultra-short pulse laser that all-fiber mode-locked laser produces exports through output coupler 5.
Wherein, all-fiber mode-locked laser also comprises: tunable optic filter 7, after being arranged in output coupler 5.By tunable optic filter 7, laser oscillation wavelength is limited in the transmission peaks place of multimode interference couplers 4, thus enhanced modulation effect, improve locked mode run stability.
Embodiment 2
The utility model embodiment is for the fiber laser of 1.5 mum wavelengths, utilize optical kerr effect in multimode interference couplers 4 to cause the change of transmission spectrum to modulate laser intensity, realize the locked mode running of fiber laser, its device damage threshold value is high, and economical, described below:
Based on an all-fiber mode-locked laser for multimode interference couplers Kerr effect, mainly comprise: pumping source 1, signal pump combiner 2, Active Optical Fiber 3, multimode interference couplers 4, output coupler 5, isolator 6;
Wherein, for obtaining 1.5 μm of Laser outputs, Active Optical Fiber 3 adopts SM-EYDF-6/125-HE double clad Er/Yb to mix monomode fiber altogether, its fibre core numerical aperture NA=0.18, covering NA>0.46, length 5m; Correspondingly, pumping source 1 adopts the coupling fiber output semiconductor laser of wavelength 915nm or 975nm, power output 10W; Signal pump combiner 2 is (2+1) × 1 type; Monomode fiber 4-1 in multimode interference couplers 4 is SMF-28e, and multimode fiber 4-2 specification is 50/125 μm, length 100mm, corresponding transmission peaks 1.53 μm; Output coupler 5 coupling ratio is 50/50; Isolator 6 is twin-stage isolation; All device tail optical fibers are SMF-28e optical fiber.
915nm or 975nm pumping source 1 launches pump light, is coupled into Active Optical Fiber 3 through signal pump combiner 2; Active Optical Fiber 3 absorptive pumping light, forms population inversion, produces laser gain; Each device welding looping chamber, after gain exceedes the loss of resonator, produce laser generation in chamber, under the effect of isolator 6, laser is Unidirectional in chamber, exports through output coupler 5.Due to optical kerr effect, after producing laser, in multimode interference couplers, multimode fiber refractive index can change, thus the transmission spectrum of device is drifted about, namely device changes to some extent in the transmitance of laser wave strong point, and the change of transmitance constitutes modulating action for the laser intensity in chamber.When laser works is at Near Threshold, can occurs from pulse effects in laser operation, also just form periodic modulation, thus start locked mode voluntarily, produce ultra-short pulse laser and export.
Wherein, mode-locked laser also comprises: tunable optic filter 7, after being arranged in output coupler 5, by tunable optic filter 7, laser oscillation wavelength is limited in the transmission peaks place of multimode fiber 4-2, thus enhanced modulation effect, improve locked mode run stability.
Wherein, Active Optical Fiber 3 can adopt Er/Yb to mix silica fiber altogether to obtain 1.5 μm of Laser outputs, also can adopt the optical fiber of other Doped ions such as Yb silica fiber, Er:ZBLAN and matrix, to obtain the Laser output of its all band, the utility model embodiment does not limit this; When using the Active Optical Fiber 3 of other types, pumping source 1 used needs the laser of corresponding other different wave lengths of employing, and pumping wavelength is conventionally known to one of skill in the art, does not repeat them here.
Wherein, the multimode fiber core diameter of multimode interference couplers can be 50 μm, also can be other specifications such as 25,30,100 μm, correspondingly select length to make its transmission peaks corresponding with the gain peak of Active Optical Fiber 3 in practical application, the utility model embodiment does not limit this.
The utility model embodiment is to the model of each device except doing specified otherwise, and the model of other devices does not limit, as long as can complete the device of above-mentioned functions.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, above-mentioned the utility model embodiment sequence number, just to describing, does not represent the quality of embodiment.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (2)
1. all-fiber mode-locked laser based on multimode interference couplers Kerr effect, described all-fiber mode-locked laser comprises: pumping source, it is characterized in that, also comprise: signal pump combiner, Active Optical Fiber, multimode interference couplers, output coupler and isolator
Described pumping source launches the pump light in Active Optical Fiber absorption band, and described pump light is coupled into described Active Optical Fiber through described signal pump combiner; Described Active Optical Fiber absorptive pumping light, forms population inversion, produces laser gain; Described multimode interference couplers is made up of welding one section of multimode fiber in the middle of two section single-mould fibers, and the transmission peaks of described multimode fiber is consistent with the gain peak of described Active Optical Fiber;
Described signal pump combiner, described Active Optical Fiber, described multimode interference couplers, described output coupler, described isolator arrange welding in turn, form unidirectional loop laser resonance cavity.
2. a kind of all-fiber mode-locked laser based on multimode interference couplers Kerr effect according to claim 1, it is characterized in that, described all-fiber mode-locked laser also comprises: tunable optic filter,
After described tunable optic filter is arranged on described output coupler; Described tunable optic filter is used for transmission peaks place laser oscillation wavelength being limited in described multimode fiber.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420706188.7U CN204190153U (en) | 2014-11-21 | 2014-11-21 | A kind of all-fiber mode-locked laser based on multimode interference couplers Kerr effect |
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| CN201420706188.7U CN204190153U (en) | 2014-11-21 | 2014-11-21 | A kind of all-fiber mode-locked laser based on multimode interference couplers Kerr effect |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104409951A (en) * | 2014-11-21 | 2015-03-11 | 天津大学 | All-optical-fibre mode-locked laser based on Kerr effect of multi-mode interference device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104409951A (en) * | 2014-11-21 | 2015-03-11 | 天津大学 | All-optical-fibre mode-locked laser based on Kerr effect of multi-mode interference device |
| CN104409951B (en) * | 2014-11-21 | 2017-08-04 | 天津大学 | A kind of all -fiber mode-locked laser based on multimode interference couplers Kerr effect |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150304 Termination date: 20181121 |