CN107069413A - Lead selenide quantum dot as saturated absorbing body mode locked fiber laser - Google Patents
Lead selenide quantum dot as saturated absorbing body mode locked fiber laser Download PDFInfo
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- CN107069413A CN107069413A CN201710387907.1A CN201710387907A CN107069413A CN 107069413 A CN107069413 A CN 107069413A CN 201710387907 A CN201710387907 A CN 201710387907A CN 107069413 A CN107069413 A CN 107069413A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
- H01S3/1112—Passive mode locking
- H01S3/1115—Passive mode locking using intracavity saturable absorbers
- H01S3/1118—Semiconductor saturable absorbers, e.g. semiconductor saturable absorber mirrors [SESAMs]; Solid-state saturable absorbers, e.g. carbon nanotube [CNT] based
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- 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
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
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Abstract
The invention discloses mode locked fiber laser of the lead selenide quantum dot as saturated absorbing body.The application of passive mode-locking fiber laser based on saturated absorbing body is increasingly extensive, but existing quantum dot saturated absorbing body uses block structure mostly, and coupling efficiency is low, compatible with optical fiber laser difficult.The present invention includes pumping source, wavelength division multiplexer, gain fibre, output coupler, wave filter, fiber saturable absorber and connection optical fiber.Fiber saturable absorber is made up of the glass optical fiber of doping lead selenide quantum dot.Pumping source uses the semiconductor laser with multimode pigtail.Gain fibre uses Yb dosed optical fiber or Er-doped fiber or thulium doped fiber.Described connection optical fiber uses single-mode fiber.The present invention has the third-order nonlinear optical effect more stronger than same component bulk material and faster time response, and can be compatible with mode locked fiber laser.
Description
Technical field
The invention belongs to fiber laser technology field, and in particular to a kind of lead selenide quantum dot is used as saturated absorbing body
Mode locked fiber laser.
Background technology
Psec or the ultrafast laser of femtosecond pulse output have peak power high and with the material effects time it is short the characteristics of,
Therefore formerly enter manufacture, biologic medical and environmental monitoring etc. and concern the key areas of the people's livelihood to play more and more important effect.
In addition, optical fiber laser has perfect beam quality, therefore ultrafast optical fiber laser has become the hair of ultrafast light source
Exhibition trend.In ultrafast field, mode-locking technique has become the main means for producing ultrashort pulse.Wherein, active mode locking energy
The tunable of pulse recurrence frequency is enough realized, but needs one modulator of insertion in resonator to synchronize control, and is adjusted
Device processed is often expensive.Passive mode-locking can export the pulsewidth more narrower than active mode locking without external modulation.Passive
Locked mode field, the passive mode-locking fiber laser based on saturated absorbing body, with compact conformation, it is with low cost, be easy to self-starting
Advantage, have become the study hotspot in the field.
The species of saturated absorbing body is various, mainly have semiconductor saturated absorption mirror (SESAM), graphene (graghene) and
Single-walled carbon nanotube (SWCNT) etc..SESAM is more ripe saturated absorbing body material, applied to commercial ultrashort pulse
Optical fiber laser, is had the disadvantage that complex manufacturing technology and cost are high, is generally prepared using molecular beam epitaxy technique, and with light
Fibre laser it is compatible poor.Graphene and SWCNT have broadband saturable absorption characteristic and preparation cost is low, shortcoming right and wrong
Saturation loss is big, and modulation depth is relatively low, and the material prepared is not directly applicable optical fiber laser, it is necessary to heavy using light
The methods such as product carry out the transfer of material, and the process steps are relatively complicated, waste time and energy.Semiconductor nanocrystal quantum dot is a kind of
The nano material of quasi-zero dimension.Because the size of quantum dot is less than exciton Bohr radius so that they have very strong quantum confinement
Effect, so as to result in the increase of exciton bind energy and oscillator strength, the increase of oscillator strength means material more block than same component
Expect stronger third-order nonlinear optical effect and faster time response.Quantum dot another advantage is that can be by changing it
Size, realizes the tunable of the saturated absorption characteristic such as modulation depth, so as to control the pulse characteristic that laser is exported.Thus,
Ultrafast laser field, quantum dot will undoubtedly turn into a kind of promising saturated absorbing body material.
Existing quantum dot saturated absorbing body uses block structure mostly, generally requires lens focus, influences coupling efficiency,
So that it is compatible with optical fiber laser difficult.
The content of the invention
The purpose of the present invention is the defect that exists for existing saturated absorbing body mode locked fiber laser or not enough there is provided one
The glass optical fiber for planting doping lead selenide quantum dot is used as the optical fiber laser of saturated absorbing body.
The present invention includes pumping source, wavelength division multiplexer, gain fibre, output coupler, wave filter, fiber saturable absorber
And connection optical fiber.Described fiber saturable absorber is the glass optical fiber of doping lead selenide quantum dot.Described pumping source is adopted
With the semiconductor laser with multimode pigtail.Described gain fibre uses Yb dosed optical fiber or Er-doped fiber or thulium doped fiber.Institute
The output for stating output coupler is compared for 10%~90%.Described connection optical fiber uses single-mode fiber, and length is 10~50m.
The output optical fibre of the pumping source is connected with the pumping end of wavelength division multiplexer；The output end of the wavelength division multiplexer with
One end of gain fibre is connected；The other end of gain fibre is connected with one end of output coupler, the other end of output coupler
It is connected with the input of wave filter；The output end of wave filter is connected with one end of fiber saturable absorber.Fiber saturable absorber
The other end and be connected optical fiber one end be connected.The other end of connection optical fiber is connected with the signal end of wavelength division multiplexer.
Described output coupler is made up of two single-mode fibers fused biconical taper.
The specific preparation process of the fiber saturable absorber is as follows：It regard the mixture of lead oxide and selenium powder as lead selenide
The presoma of quantum dot is added among preparing glass charge；Be mixed with presoma preparing glass charge include silica, diboron trioxide,
Aluminum oxide, zinc oxide, aluminum fluoride, sodium oxide molybdena, lead oxide, selenium powder and carbon dust.The preparing glass charge for having added presoma is ground equal
It is even and pour into crucible.Crucible is put into heating in box-type high-temperature furnace and obtains both bulk glasses, heating-up temperature is 1300~1600 DEG C, plus
Thermal endurance is 30~180 minutes.Crucible is taken out after box-type high-temperature furnace, using a thinner iron wire to obtained bulk
Glass carries out fibre-optical drawing.The optical fiber that drawing is obtained is put into tube type high-temperature furnace and is heat-treated, and realizes lead selenide quantum dot
Precipitation, growth, coring and crystallization.
Described wave filter is 1064nm by centre wavelength and chirped fiber Bragg grating and fiber optic loop with a width of 5nm
Shape device is constituted；First exciton absorption peak of fiber saturable absorber is 1064nm；The core diameter for connecting optical fiber is 6 μm, and external diameter is 125
μm。
Described wave filter is 1550nm, the chirped fiber Bragg grating with a width of 5nm and fiber optic loop by centre wavelength
Shape device is constituted；First exciton absorption peak of fiber saturable absorber is 1550nm；Optical fiber is connected using the general of model SMF-28
Logical Single mode communication optical fiber.
Described wave filter is 1940nm, the chirped fiber Bragg grating with a width of 5nm and fiber optic loop by centre wavelength
Shape device is constituted；First exciton absorption peak of fiber saturable absorber is 1940nm；The core diameter for connecting optical fiber is 10 μm, and external diameter is
125μm。
It is described to be mixed with silica, diboron trioxide, aluminum oxide, zinc oxide, aluminum fluoride, oxygen in the preparing glass charge of presoma
Change sodium, lead oxide, the mass fraction of selenium powder and carbon dust be respectively 58.7 parts, 4.5 parts, 4.0 parts, 8.9 parts, 2.2 parts, 15.7 parts,
3.0 parts, 3.0 parts, 1.0 parts.
The invention has the advantages that：
1st, there is the lead selenide quantum dot that the present invention is applied the third-order nonlinear optical more stronger than lead selenide bulk material to imitate
Should be with faster time response.
2nd, the present invention has higher optic damage threshold value, can be compatible with mode locked fiber laser.
3rd, substantially, saturated absorption performance is good for the quantum confined effect of the lead selenide quanta point optical fiber used in the present invention, prepares
Cost is relatively low.
Brief description of the drawings
Fig. 1 is the device connection diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in figure 1, mode locked fiber laser of the lead selenide quantum dot as saturated absorbing body, including pumping source 1, wavelength-division
Multiplexer 2, gain fibre 3, output coupler 4, wave filter 5, fiber saturable absorber 6 and connection optical fiber 7.Optical fiber saturation is inhaled
Acceptor 6 is the glass optical fiber of doping lead selenide quantum dot.Pumping source 1 uses the semiconductor laser with multimode pigtail.Gain light
Fibre 3 uses Yb dosed optical fiber or Er-doped fiber or thulium doped fiber.Output coupler is made up of two single-mode fibers fused biconical taper,
Output is than being 10%；Connection optical fiber 7 uses single-mode fiber, and length is 20m.
As shown in figure 1, the output optical fibre of pumping source 1 is connected with the pumping end of wavelength division multiplexer 2；Wavelength division multiplexer 2 it is defeated
Go out end with one end of gain fibre 3 to be connected；The other end of gain fibre 3 is connected with one end of output coupler 4, output coupler
4 other end is connected with the input of wave filter 5；The output end of wave filter 5 is connected with one end of fiber saturable absorber 6.Light
The other end of fine saturated absorbing body 6 is connected with being connected one end of optical fiber 7.Connect the other end of optical fiber 7 and the letter of wavelength division multiplexer 2
Number end be connected.
The specific preparation process of fiber saturable absorber 6 is as follows：It regard the mixture of lead oxide and selenium powder as lead selenide amount
The presoma of son point is added among preparing glass charge；The preparing glass charge for being mixed with presoma is silica, diboron trioxide, oxidation
Aluminium, zinc oxide, aluminum fluoride, sodium oxide molybdena, lead oxide, selenium powder and carbon dust are according to 58.7:4.5:4.0:8.9:2.2:15.7:3.0:
3.0:1.0 mass ratio mixing.Preparing glass charge is ground uniformly and crucible is poured into.Crucible is put into box-type high-temperature furnace and heated
To both bulk glasses, heating-up temperature is 1500 DEG C, and the duration of heat is 120 minutes.Crucible is taken out after box-type high-temperature furnace, utilized
A piece thinner iron wire carries out fibre-optical drawing to obtained both bulk glasses.The optical fiber that drawing is obtained is put into tube type high-temperature furnace and carried out
Heat treatment, realizes precipitation, growth, coring and the crystallization of lead selenide quantum dot.By controlling quantum dot size, light can be adjusted
First exciton absorption peak position of fine saturated absorbing body 6.
The design parameter value of wave filter 5, fiber saturable absorber 6 and connection optical fiber 7 uses following three kinds of methods of salary distribution：
Embodiment 1：Wave filter 5 is 1064nm by centre wavelength and chirped fiber Bragg grating and light with a width of 5nm
Fine circulator composition；First exciton absorption peak of fiber saturable absorber 6 is 1064nm；The core diameter for connecting optical fiber 7 is 6 μm, outside
Footpath is 125 μm.The picosecond laser output that centre wavelength is located near 1064nm can be realized.
Embodiment 2：Wave filter 5 is 1550nm, chirped fiber Bragg grating and optical fiber with a width of 5nm by centre wavelength
Circulator is constituted；First exciton absorption peak of fiber saturable absorber 6 is 1550nm；Optical fiber 7 is connected using model SMF-28
General single mode telecommunication optical fiber.The femtosecond laser output that centre wavelength is located near 1550nm can be realized.
Embodiment 3：Wave filter 5 is 1940nm, chirped fiber Bragg grating and optical fiber with a width of 5nm by centre wavelength
Circulator is constituted；First exciton absorption peak of fiber saturable absorber 6 is 1940nm；The core diameter for connecting optical fiber 7 is 10 μm, external diameter
For 125 μm.The femtosecond laser output that centre wavelength is located near 1940nm can be realized.
Claims (7)
1. lead selenide quantum dot is used as the mode locked fiber laser of saturated absorbing body, including pumping source, wavelength division multiplexer, gain light
Fibre, output coupler, wave filter, fiber saturable absorber and connection optical fiber；It is characterized in that：Described optical fiber saturated absorption
Body is made up of the glass optical fiber of doping lead selenide quantum dot；Described pumping source uses the semiconductor laser with multimode pigtail；
Described gain fibre uses Yb dosed optical fiber or Er-doped fiber or thulium doped fiber；The output of the output coupler compares for 10%~
90%；Described connection optical fiber uses single-mode fiber, and length is 10~50m；
The output optical fibre of the pumping source is connected with the pumping end of wavelength division multiplexer；The output end of the wavelength division multiplexer and gain
One end of optical fiber is connected；The other end of gain fibre is connected with one end of output coupler, the other end of output coupler and filter
The input of ripple device is connected；The output end of wave filter is connected with one end of fiber saturable absorber；Fiber saturable absorber it is another
One end is connected with being connected one end of optical fiber；The other end of connection optical fiber is connected with the signal end of wavelength division multiplexer.
2. lead selenide quantum dot according to claim 1 exists as the mode locked fiber laser of saturated absorbing body, its feature
In：Described output coupler is made up of two single-mode fibers fused biconical taper.
3. lead selenide quantum dot according to claim 1 exists as the mode locked fiber laser of saturated absorbing body, its feature
In：The specific preparation process of the fiber saturable absorber is as follows：It regard the mixture of lead oxide and selenium powder as lead selenide quantum
The presoma of point is added among preparing glass charge；Being mixed with the preparing glass charge of presoma includes silica, diboron trioxide, oxidation
Aluminium, zinc oxide, aluminum fluoride, sodium oxide molybdena, lead oxide, selenium powder and carbon dust；The preparing glass charge for having added presoma is ground uniformly simultaneously
Pour into crucible；Crucible is put into heating in box-type high-temperature furnace and obtains both bulk glasses, heating-up temperature is 1300~1600 DEG C, and heating is held
The continuous time is 30~180 minutes；Crucible is taken out after box-type high-temperature furnace, using a thinner iron wire to obtained both bulk glasses
Carry out fibre-optical drawing；Obtained optical fiber will be drawn be put into tube type high-temperature furnace and be heat-treated, realize lead selenide quantum dot precipitation,
Growth, coring and crystallization.
4. lead selenide quantum dot according to claim 1 exists as the mode locked fiber laser of saturated absorbing body, its feature
In：Described wave filter is 1064nm by centre wavelength and chirped fiber Bragg grating and optical fiber circulator with a width of 5nm
Composition；First exciton absorption peak of fiber saturable absorber is 1064nm；The core diameter for connecting optical fiber is 6 μm, and external diameter is 125 μm.
5. lead selenide quantum dot according to claim 1 exists as the mode locked fiber laser of saturated absorbing body, its feature
In：Described wave filter is 1550nm, the chirped fiber Bragg grating with a width of 5nm and optical fiber circulator group by centre wavelength
Into；First exciton absorption peak of fiber saturable absorber is 1550nm；Connect the general single mode that optical fiber uses model SMF-28
Telecommunication optical fiber.
6. lead selenide quantum dot according to claim 1 exists as the mode locked fiber laser of saturated absorbing body, its feature
In：Described wave filter is 1940nm, the chirped fiber Bragg grating with a width of 5nm and optical fiber circulator group by centre wavelength
Into；First exciton absorption peak of fiber saturable absorber is 1940nm；The core diameter for connecting optical fiber is 10 μm, and external diameter is 125 μm.
7. lead selenide quantum dot according to claim 3 exists as the mode locked fiber laser of saturated absorbing body, its feature
In：It is described be mixed with silica in the preparing glass charge of presoma, diboron trioxide, aluminum oxide, zinc oxide, aluminum fluoride, sodium oxide molybdena,
The mass fraction of lead oxide, selenium powder and carbon dust is respectively 58.7 parts, 4.5 parts, 4.0 parts, 8.9 parts, 2.2 parts, 15.7 parts, 3.0 parts,
3.0 parts, 1.0 parts.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107453198A (en) * | 2017-09-19 | 2017-12-08 | 深圳市太赫兹科技创新研究院 | Optical fiber laser |
| CN108767648A (en) * | 2018-07-27 | 2018-11-06 | 南方科技大学 | Saturable absorber device and preparation method thereof, mode locked fiber laser |
| CN109119876A (en) * | 2018-07-13 | 2019-01-01 | 上海大学 | Fiber pulse laser and preparation method thereof based on vulcanized lead quantum dot film |
| CN110518442A (en) * | 2019-07-10 | 2019-11-29 | 杭州电子科技大学 | Dual wavelength lead selenide quantum dot optical fiber laser with super continuous spectrum |
| CN114604830A (en) * | 2022-02-25 | 2022-06-10 | 浙江亚愚科技有限公司 | Soliton mode-locked fiber laser based on palladium diselenide saturable absorber |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107453198A (en) * | 2017-09-19 | 2017-12-08 | 深圳市太赫兹科技创新研究院 | Optical fiber laser |
| CN109119876A (en) * | 2018-07-13 | 2019-01-01 | 上海大学 | Fiber pulse laser and preparation method thereof based on vulcanized lead quantum dot film |
| CN108767648A (en) * | 2018-07-27 | 2018-11-06 | 南方科技大学 | Saturable absorber device and preparation method thereof, mode locked fiber laser |
| CN110518442A (en) * | 2019-07-10 | 2019-11-29 | 杭州电子科技大学 | Dual wavelength lead selenide quantum dot optical fiber laser with super continuous spectrum |
| CN110518442B (en) * | 2019-07-10 | 2020-09-01 | 杭州电子科技大学 | Dual-wavelength lead selenide quantum dot super-continuum spectrum optical fiber laser |
| CN114604830A (en) * | 2022-02-25 | 2022-06-10 | 浙江亚愚科技有限公司 | Soliton mode-locked fiber laser based on palladium diselenide saturable absorber |
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Effective date of registration: 20201214 Address after: Building loftc, West Greenland Business City, Hanyuan Avenue, Yunlong District, Xuzhou City, Jiangsu Province, 221000 Patentee after: XUZHOU XINNANHU TECHNOLOGY Co.,Ltd. Address before: 310018 No. 2 street, Xiasha Higher Education Zone, Hangzhou, Zhejiang Patentee before: HANGZHOU DIANZI University |
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