CN104409951B - 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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Abstract
The invention 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 are made up of one section of multimode fibre of welding in the middle of two section single-mould fibers, and the transmission peaks of multimode fibre are consistent with the gain peak of Active Optical Fiber；Signal pump combiner, Active Optical Fiber, multimode interference couplers, output coupler, isolator sequentially arrange welding, constitute unidirectional loop laser resonance cavity；In the presence of laser, multimode fibre refractive index is changed, and multiple-mode interfence changes from the position of photosites, and multimode fibre changes in the transmitance of laser wave strong point, and modulating action is constituted to the laser intensity of loop laser resonance cavity；Output coupler exports ultra-short pulse laser.The present invention improves laser output power, with low cost.
Description
Technical field
The present invention relates to field of lasers, more particularly to a kind of all -fiber locked mode based on multimode interference couplers Kerr effect
Laser.
Background technology
Ultrafast mode-locked laser has a wide range of applications in basic research, medical science, national defence and industrial processes.Due to optical fiber
Laser has many advantages such as compact conformation, efficient, firm and high performance-price ratio, various working stabilities, the locked mode of compact conformation
Optical fiber laser is developed.For active mode locking, the optical fiber laser of passive mode-locking is all many-sided with obvious
Advantage, for example：The response of saturable absorber or Kerr-type device and recovery time are general all very short, therefore passive mode-locking
The pulse width of generation is generally narrower than active mode locking；Without spatial light modulator and corresponding electronic equipment, thus structure is more
To be simple compact；Also will not in modulated device electrical noise influence.
Existing passive mode-locking fiber laser relies primarily on the realization of saturable absorption device, and such as " dual wavelength is ultrashort for patent
The passive mode-locking fiber laser of pulse output " (ZL 200910029722.9) and " graphene passive mode-locking fiber laser "
(ZL201110101110.3) etc..One distinct disadvantage of such passive mode-locking fiber laser is that saturable used is inhaled
Receipts device, such as semiconductor saturable absorbing mirror (SESAM), CNT and graphene, damage threshold is generally relatively low, therefore energy
The average output power enough produced is limited in several to dozens of mW magnitude, and the Mode-locked laser of more power can only be leaned on
Fiber amplifier is obtained, and adds the complexity of system.
The content of the invention
The invention provides a kind of all -fiber mode-locked laser based on multimode interference couplers Kerr effect, the present invention is improved
Laser output power, it is with low cost, realize high power mode locked fiber laser simple in construction, it is described below：
A kind of all -fiber mode-locked laser based on multimode interference couplers Kerr effect, all -fiber mode-locked laser bag
Include：Pumping source, in addition to：Signal pump combiner, Active Optical Fiber, multimode interference couplers, output coupler and isolator,
Pump light in the pumping source transmitting Active Optical Fiber absorption band, the pump light is through the signal pump combiner
It is coupled into the Active Optical Fiber；The Active Optical Fiber absorptive pumping light, forms population inversion, produces laser gain；It is described
Multimode interference couplers one section of multimode fibre of welding in the middle of two section single-mould fibers is constituted, the transmission peaks of the multimode fibre with it is described
The gain peak of Active Optical Fiber is consistent；
It is the signal pump combiner, the Active Optical Fiber, the multimode interference couplers, the output coupler, described
Isolator sequentially arranges welding, constitutes unidirectional loop laser resonance cavity；
In the presence of laser, the multimode fibre refractive index is changed, and multiple-mode interfence is sent out from the position of photosites
Raw to change, the multimode fibre changes in the transmitance of laser wave strong point, to the laser intensity structure of loop laser resonance cavity
Into modulating action；The output coupler exports ultra-short pulse laser.
The all -fiber mode-locked laser also includes：Tunable optic filter,
The tunable optic filter is arranged on after the output coupler；By the tunable optic filter, by laser
Oscillation wavelength is limited at the transmission peaks of the multimode fibre.
The beneficial effect for the technical scheme that the present invention is provided is：Realize that optical fiber swashs using the Kerr effect of multimode interference couplers
The passive mode-locking operating of light device, a kind of new way is provided for the realization of mode-locked ultrashort pulse laser.With existing passive mode-locking
The saturable absorption mode-locking devices such as SESAM, the graphene that optical fiber laser is used are compared, and multimode used in technical solution of the present invention is done
The damage threshold for relating to device is very high, thus is favorably improved laser output power；And multimode interference couplers simple in construction, cost
It is cheap, be conducive to actual popularization and application.
Brief description of the drawings
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：Single-mode fiber 4-2：Multimode fibre.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, further is made to embodiment of the present invention below
It is described in detail on ground.
Compared compared with the laser with active-passive lock mould in technology using saturable absorber, the locked mode light based on Kerr effect
Fibre laser results in higher power output；Further, since there is electron cloud metaboly in glass, glass can realize pole
The fast non-linear response time, thus Kerr-type laser with active-passive lock mould can provide shorter output pulse width.
Embodiment 1
It is low in order to solve saturable absorption locked mode element damage threshold value in existing passive mode-locking fiber laser, limit laser
The problem of power output, referring to Fig. 1, the embodiments of the invention provide a kind of all -fiber based on multimode interference couplers Kerr effect
Mode-locked laser, all -fiber mode-locked laser includes：Pumping source 1, signal pump combiner 2, Active Optical Fiber 3, multimode interference
Part 4, output coupler 5 and isolator 6,
Pump light in the absorption band of the transmitting Active Optical Fiber 3 of pumping source 1, pump light enters through signal pump combiner coupling 2
Enter Active Optical Fiber 3；The absorptive pumping light of Active Optical Fiber 3, forms population inversion, produces laser gain；Multimode interference couplers 4 are two
One section of multimode fibre of welding is constituted in the middle of section single-mould fiber, and its transmission peaks is consistent with the gain peak of Active Optical Fiber 3, i.e., used many
Mode fiber length and corresponding optical maser wavelength are from photosites position consistency.Signal pump combiner 2, Active Optical Fiber 3, multiple-mode interfence
Device 4, output coupler 5, isolator 6 sequentially arrange welding, constitute unidirectional loop laser resonance cavity.
As pump power increases, after laser gain exceedes loss, intracavitary produces laser；In the presence of laser, by
Multimode fibre refractive index changes in Kerr effect, multimode interference couplers 4；Influenceed by variations in refractive index, its multimode is done
Relate to and changed from the position of photosites, i.e., the transmission spectrum of device produces movement, device occurs in the transmitance of laser wave strong point
Change, the change of transmitance constitutes modulating action for the laser intensity of intracavitary.When all -fiber mode-locked laser is operated in threshold
When near value, all -fiber mode-locked laser also can just form periodic modulation, so as to start locked mode to be operated from pulse.Quan Guang
The ultra-short pulse laser that fine mode-locked laser is produced is exported through output coupler 5.
Wherein, all -fiber mode-locked laser also includes：Tunable optic filter 7, is arranged in after output coupler 5.Pass through
At tunable optic filter 7, the transmission peaks that laser oscillation wavelength is limited in multimode interference couplers 4, so that enhanced modulation effect, is carried
High locked mode run stability.
Embodiment 2
The embodiment of the present invention utilizes optical kerr effect in multimode interference couplers 4 by taking the optical fiber laser of 1.5 mum wavelengths as an example
Cause the change of transmission spectrum to be modulated laser intensity, realize the locked mode operating of optical fiber laser, its device damage threshold value is high,
And cost economy, it is described below：
A kind of all -fiber mode-locked laser based on multimode interference couplers Kerr effect, mainly includes：Pumping source 1, signal
Pump combiner 2, Active Optical Fiber 3, multimode interference couplers 4, output coupler 5, isolator 6；
Wherein, to obtain 1.5 μm of laser outputs, Active Optical Fiber 3 is co-doped with using SM-EYDF-6/125-HE double clads Er/Yb
Single-mode fiber, its fibre core numerical aperture NA=0.18, covering NA>0.46, length 5m；Correspondingly, pumping source 1 uses wavelength
915nm or 975nm fiber coupling output semiconductor laser, power output 10W；Signal pump combiner 2 is (2+1) × 1
Type；Single-mode fiber 4-1 in multimode interference couplers 4 is SMF-28e, and multimode fibre 4-2 specifications are 50/125 μm, length 100mm,
1.53 μm of transmission peaks of correspondence；The coupling ratio of output coupler 5 is 50/50；Isolator 6 is isolated for twin-stage；All device tail optical fibers are
SMF-28e optical fiber.
915nm or 975nm pumping sources 1 launch pump light, and Active Optical Fiber 3 is coupled into through signal pump combiner 2；It is active
The absorptive pumping light of optical fiber 3, forms population inversion, produces laser gain；Each device welding constitutes annular chamber, when gain is more than humorous
Shake after cavity loss, intracavitary produces laser generation, and in the presence of isolator 6, laser is in intracavitary Unidirectional, through output coupler
5 outputs.Due to optical kerr effect, multimode fibre refractive index can produce change in multimode interference couplers after generation laser, so that
The transmission spectrum for obtaining device is drifted about, i.e., device is varied from the transmitance of laser wave strong point, and the change of transmitance is for chamber
Interior laser intensity constitutes modulating action.When laser works are in Near Threshold, can occur from pulse in laser operation
Effect, also just forms periodic modulation, so as to voluntarily start locked mode, produces ultra-short pulse laser output.
Wherein, mode-locked laser also includes：Tunable optic filter 7, is arranged in after output coupler 5, by tunable
At wave filter 7, the transmission peaks that laser oscillation wavelength is limited in multimode fibre 4-2, so that enhanced modulation effect, improves locked mode fortune
Turn stability.
Wherein, Active Optical Fiber 3 can use Er/Yb to be co-doped with silica fibre to obtain 1.5 μm of laser outputs, can also use Yb stones
English optical fiber, Er:The optical fiber of other Doped ions such as ZBLAN and matrix, is exported, the present invention is implemented with the laser for obtaining its all band
Example is without limitation；During using other kinds of Active Optical Fiber 3, pumping source 1 used need to be accordingly using other different wave lengths
Laser, pumping wavelength is known to those skilled in the art, will not be repeated here.
Wherein, the multimode fibre core diameter of multimode interference couplers can be 50 μm, or 25,30, other rule such as 100 μm
Length is correspondingly selected to make its transmission peaks corresponding with the gain peak of Active Optical Fiber 3 in lattice, practical application, the present invention is implemented
Example is without limitation.
The embodiment of the present invention is to the model of each device in addition to specified otherwise is done, and the model of other devices is not limited,
As long as the device of above-mentioned functions can be completed.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the embodiments of the present invention
Sequence number is for illustration only, and the quality of embodiment is not represented.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (1)
1. a kind of all -fiber mode-locked laser based on multimode interference couplers Kerr effect, all -fiber mode-locked laser bag
Include：Pumping source, it is characterised in that also include：Signal pump combiner, Active Optical Fiber, multimode interference couplers, output coupler and
Isolator,
Pump light in the pumping source transmitting Active Optical Fiber absorption band, the pump light is coupled through the signal pump combiner
Into the Active Optical Fiber；The Active Optical Fiber absorptive pumping light, forms population inversion, produces laser gain；The multimode
Interfered device one section of multimode fibre of welding in the middle of two section single-mould fibers is constituted, the transmission peaks of the multimode fibre with it is described active
The gain peak of optical fiber is consistent；The passive mode-locking for realizing laser by the Kerr effect of the multimode interference couplers is operated；
The signal pump combiner, the Active Optical Fiber, the multimode interference couplers, the output coupler, the isolation
Device sequentially arranges welding, constitutes unidirectional loop laser resonance cavity；
In the presence of laser, the multimode fibre refractive index changes, and multiple-mode interfence changes from the position of photosites
Become, the multimode fibre changes in the transmitance of laser wave strong point, tune is constituted to the laser intensity of loop laser resonance cavity
Make and use；The output coupler exports ultra-short pulse laser；
The all -fiber mode-locked laser also includes：Tunable optic filter,
The tunable optic filter is arranged on after the output coupler；By the tunable optic filter, by laser generation
Wavelength is limited at the transmission peaks of the multimode fibre, enhanced modulation effect, improves locked mode run stability.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104733993A (en) * | 2015-04-16 | 2015-06-24 | 西北核技术研究所 | Saturable absorption optical fiber based all-fiber multi-wavelength passive Q-switched laser |
| CN107230927B (en) * | 2017-06-29 | 2019-05-14 | 中国计量大学 | 2 μm of mode locked fiber lasers based on SMF-SIMF-GIMF-SMF optical fiber structure |
| CN107154576B (en) * | 2017-06-29 | 2019-03-19 | 中国计量大学 | 2 μm of dissipative solitons mode locked fiber lasers based on SMF-SIMF-GIMF-SMF optical fiber structure |
| CN108321671A (en) * | 2018-03-04 | 2018-07-24 | 中国计量大学 | A kind of passive mode-locking fiber laser based on graded index multimode fiber saturable absorber |
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| CN102340093A (en) * | 2010-07-27 | 2012-02-01 | 清华大学 | Optical fiber mode locked laser |
| CN102437501A (en) * | 2011-12-07 | 2012-05-02 | 北京工业大学 | Mode-locked laser based on doped fiber array |
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| CN204190153U (en) * | 2014-11-21 | 2015-03-04 | 天津大学 | A kind of all-fiber mode-locked laser based on multimode interference couplers Kerr effect |
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| DE69429448T2 (en) * | 1993-11-12 | 2002-07-25 | British Telecomm | OPTICAL FILTER |
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| CN102340093A (en) * | 2010-07-27 | 2012-02-01 | 清华大学 | Optical fiber mode locked laser |
| CN102437501A (en) * | 2011-12-07 | 2012-05-02 | 北京工业大学 | Mode-locked laser based on doped fiber array |
| CN103247935A (en) * | 2013-04-19 | 2013-08-14 | 王枫秋 | Optical anisotropy saturable absorption device, manufacturing method and pulse laser based on device |
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