CN205992656U - A kind of super large bandwidth super continuous spectrums LASER Light Source - Google Patents
A kind of super large bandwidth super continuous spectrums LASER Light Source Download PDFInfo
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- CN205992656U CN205992656U CN201620471561.4U CN201620471561U CN205992656U CN 205992656 U CN205992656 U CN 205992656U CN 201620471561 U CN201620471561 U CN 201620471561U CN 205992656 U CN205992656 U CN 205992656U
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Abstract
This utility model provides a kind of super large bandwidth super continuous spectrums LASER Light Source, mainly includes pulse optical fiber, fiber amplifier and germanium oxide optical fiber；Wherein germanium oxide optical fiber adopts step index type refractive index structures optical fiber, photon crystal structure optical fiber or microstructured optical fibers；Described super large bandwidth super continuous spectrums LASER Light Source is by introducing positive waveguide dispersion to germanium oxide optical fiber, the zero dispersion point of germanium oxide optical fiber can be moved near 1.5 mu m wavebands from 1.7 μm to shortwave length direction, it is close to pulse optical fiber wavelength, and form the GVD curve symmetrical with regard to zero dispersion point frequency；The output spectrum of described light source can be with covering visible light to middle-infrared band, there is the features such as all optical fibre structure, with low cost, good stability it is easy to promote the use of on a large scale in various fields such as optical element performance test, micro-imaging, biomedicine, wide spectrum sensing, spectroscopy.
Description
Technical field
This utility model is related to super continuous spectrums laser field, more particularly, to a kind of super large bandwidth super continuous spectrums LASER Light Source.
Background technology
Super continuous spectrums LASER Light Source is in environment measuring, biomedicine, FSO, infrared spectroscopy, territory peace
There is important application prospect in congruent field.Compared to traditional non-coherent fluorescent light source, the spontaneous radiation light source of rare earth element and
Thermal light source, super continuous spectrums LASER Light Source has many advantages, such as brightness is high, spatial coherence is good, compact conformation, spectrum width are wider.Mesh
Front obtained widely studied based on the super continuous spectrums LASER Light Source of quartzy (silicon dioxide) optical fiber, technically tended to ripe.
But (correspond to phonon energy 1000cm when wavelength is more than 2.4 μm-1), the phonon-resonant absorption loss of quartz material drastically increases
By force, thus be difficult to obtain output wavelength in silica fibre and be located at more than 2.4 μm of super continuous spectrums LASER Light Source.In order to produce more
Long wavelength's super continuous spectrums LASER Light Source, the soft glass optical fiber generally requiring introducing in the loss of middle-infrared band low transmission is (at the sound
Sub- energy is lower), such as fluoride fiber, tellurate optical fiber and chalcogenide glass fiber, but limited this by the property of fiber optic materials
A little optical fiber thermostabilitys and mechanical performance are all generally poor.The research of fluoride fiber is earliest, and current commercialization, but fluorination
Object light fibre can occur hydrolysis phenomena under the erosion of vapor, affects the stability of its work.Tellurate optical fiber and chalcogenide glass
Although optical fiber has ratio quartz and the higher nonlinear factor of fluoride fiber, their material zero dispersion point is longer
Infrared wavelength, needs to mate the high peak power pulse optically pumped laser of longer wavelength.But these soft glass optical fiber prices are equal
Very expensive, and soft glass fibre-optical drawing and last handling process all extremely complex it is impossible to meet laboratory and the market demand.
Fiber optic materials germanium oxide (phonon energy 900cm-1) have than quartzy (phonon energy 1000cm-1) optical fiber is lower
Phonon energy, can transmit the light of middle-infrared band in theory.The physical property that simultaneous oxidation germanium has and quartz is close, and stone
English material compatibility is good, environmental stability is high, the advantages of can bear high power, and prepare that the cost of raw material is cheap, make skill
Art difficulty is low, is a kind of potential fiber optic materials.But it is currently based on germanium oxide Ramar laser and have focused largely on raman laser
Device field, and the research of super continuous spectrums LASER Light Source is less, not yet has and is arrived based on the spectral region covering visible light of germanium oxide optical fiber
The super continuous spectrums LASER Light Source of middle-infrared band appears in the newspapers.List of references (Zhang, M., et al., Mid-infrared
Raman-soliton continuum pumped by a nanotube-mode-locked sub-picosecond Tm-
Doped MOPFA.Optics express, 2013.21 (20)：P.23261.) report the femtosecond pulse pumping oxygen of 2 mum wavelengths
Change germanium optical fiber and can produce infrared super continuous spectrums LASER Light Source, but output spectrum scope only covers 1.9-3 μm.By 1.5 μm of ripples
The Q-switched laser of section or mode-locked laser pumping germanium oxide optical fiber can also produce wide spectrum super continuous spectrums LASER Light Source, but
The spectral region being seen in this kind of super continuous spectrums LASER Light Source of report at present only covers 1.6-2.6 μm of (Kamynin, V.A., et
Al., 2 μm of in GeO of Supercontinuum generation beyond2fiber：comparison of nano-and
Femtosecond pumping.Laser physics letters, 2015.12 (6)：p.065101.).Open source information shows,
Although germanium oxide optical fiber is also one kind preferably big bandwidth low-loss infrared transmission optical fiber, non-to germanium oxide optical fiber due to lacking
The control of linear and effect of dispersion, there is no at present the research of super large bandwidth super continuous spectrums LASER Light Source based on germanium oxide optical fiber with
Report.
Utility model content
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, provides a kind of low based on germanium oxide optical fiber
Cost, super large bandwidth super continuous spectrums LASER Light Source, output spectrum can be with covering visible light to middle-infrared band, and this light source has entirely
The features such as optical fiber structure, with low cost, good stability, is it is easy in optical element performance test, micro-imaging, biomedicine, wide
The various fields such as spectrum sensing, spectroscopy are promoted the use of on a large scale.
The technical scheme that this utility model is adopted is as follows：
This utility model provides a kind of super continuous spectrums LASER Light Source of super large bandwidth.Specifically by pulse optical fiber, light
Fiber amplifier and germanium oxide optical fiber composition.The input of the wherein outfan of pulse optical fiber and fiber amplifier connects,
The input of the outfan of fiber amplifier and germanium oxide optical fiber connects.Described pulse optical fiber output laser pulse warp
Cross the pulse laser obtaining output high-peak power after fiber amplifier amplifies；Further, this pulse laser conduct is used
Driving source, one section of germanium oxide optical fiber of pumping, produce the super continuous spectrums laser output of super large bandwidth.
Described pulse optical fiber is 1.5 mu m waveband pulse optical fibers.The pulse of described pulse optical fiber
Width is more than 1ps, and less than 20ns, and peak power is higher than 10W.
Described fiber amplifier is 1.5 mu m waveband fiber amplifiers.The output pulse width of described fiber amplifier is more than
1ps, less than 20ns, and peak power is higher than 1000W.
The core material of described germanium oxide optical fiber can adopt quartz material, fluorination using oxidation germanium material, clad material
Thing material or the blending ingredients of quartz and fluoride materials.
Further, described germanium oxide optical fiber includes step index type refractive index structures optical fiber, photon crystal structure light
Fine or microstructured optical fibers, the purpose of the design of structure be positive waveguide dispersion is introduced to germanium oxide optical fiber premised on.These positive waves
After leading dispersion introducing, the zero dispersion point of germanium oxide optical fiber can be moved to shortwave length direction from 1.7 μm (material zero dispersion points)
Move 1.5 mu m wavebands nearby (close to pulse optical fiber wavelength), and formed symmetrical with regard to zero dispersion point frequency
GVD curve.
Further, the core diameter of described germanium oxide optical fiber is less than 6 μm, and corresponding basic mode effective core area is less than 100 μ
m2, it is more than 2 (W km) in the optical nonlinearity coefficient of 1.5 mum wavelengths-1.
The wavelength of described pulse optical fiber is located at the anomalous dispersion region of germanium oxide optical fiber, and near fiber zero dispersion
Point position.
Connected mode between the output optical fibre of described fiber amplifier and described germanium oxide optical fiber is that melting is connected.
The spectral region of described super continuous spectrums LASER Light Source is related to visible ray, near-infrared, short-wave infrared and middle-infrared band.
Operation principle of the present utility model is as follows：Germanium oxide optical fiber has relatively low in visible ray to middle-infrared band scope
Loss and higher nonlinear factor；Can be by 1.5 μm of ripples using the unstable effect of the modulation in optical fiber and Raman effect
The pumping laser energy transfer of section gives substantial amounts of Optical Soliton；These Optical Solitons may finally pass through Raman Optical Soliton self-frequency
The nonlinear effect moved can be by the frequency of itself to long wave red shift to middle-infrared band, and Optical Soliton is during red shift simultaneously
The nonlinear effects such as dispersive wave, four-wave mixing can be captured by the orphan of phase matched and excite the light frequency positioned at shortwave direction
Composition；The final Optical Soliton of long wave and the light frequency composition of shortwave together constitute output spectrum scope covering visible light in
The super large bandwidth super continuous spectrums laser of infrared band.
Because the host material that this utility model adopts nonlinear optical fiber is oxidation germanium material, quartz material can be broken through and exist
2.4 the loss more than μm limits so that the long wavelength components of super continuous spectrums laser can reach middle-infrared band；Meanwhile, by light
After fine Dispersion managed, the short wavelength light frequency content of super continuous spectrums laser can reach visible light wave range；This makes based on germanium oxide light
Fibre can produce spectral region and be located at visible ray, the super large band of near infrared band, short infrared wave band and middle-infrared band simultaneously
Wide super continuous spectrums LASER Light Source.
The beneficial effects of the utility model are：
1. the host material that this utility model is produced as super continuous spectrums laser using high non-linearity germanium oxide optical fiber, effectively
Breach the loss to light more than 2.4 μm for the quartz material to limit so that the long wavelength components of the super continuous spectrums laser producing are permissible
Reach middle-infrared band；And pass through structure design, introduce substantial amounts of positive waveguide dispersion and the zero dispersion point aoxidizing germanium material is moved
Move near the pumping laser wavelength of 1.5 mu m wavebands, formed with regard to the symmetrical GVD curve of fiber zero dispersion dot frequency.
Thus while the spectrum of super continuous spectrums LASER Light Source is expanded to long wave direction, dispersive wave, four ripples can be captured by orphan
The nonlinear effects such as mixing excite the light frequency composition orphan positioned at shortwave direction to mate and produce certain short wavelength light frequency content,
It is greatly expanded the spectral bandwidth of super continuous spectrums LASER Light Source in germanium oxide optical fiber, be finally obtained spectral region from visible ray
Super large bandwidth super continuous spectrums LASER Light Source to middle-infrared band.
2. utilize the feature with low cost of germanium oxide optical fiber itself, using simple structure design, considerably reduce
The cost that mid-infrared super continuous spectrums LASER Light Source produces at present, adopts all optical fibre structure to design simultaneously, increased stablizing of system
Property.
3. this utility model produce super continuous spectrums laser spectral region comprise visible ray, near-infrared, short-wave infrared and
Middle-infrared band, and export laser spatial coherence good it is easy in optical element performance test, micro-imaging, biomedicine, extensively
The various fields such as spectrum sensing, spectroscopy are promoted the use of on a large scale.
Brief description
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or in description of the prior art the accompanying drawing of required use be briefly described it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, before not paying creative labor
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the structure composition schematic diagram of this utility model embodiment；
Fig. 2 is the group velocity curve figure of germanium oxide optical fiber in this utility model embodiment；
Fig. 3 is the spectrogram representing super continuous spectrums LASER Light Source in this utility model embodiment.
Specific embodiment
In description of the present utility model, it should be noted that unless otherwise clearly defined and limited, term " connects "
Should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；It can be direct phase
Even it is also possible to be indirectly connected to by intermediary.For the ordinary skill in the art, can be with concrete condition understanding
State concrete meaning in this utility model for the term.
As shown in figure 1, a kind of super continuous spectrums LASER Light Source of super large bandwidth, by pulse optical fiber 1, fiber amplifier
2nd, germanium oxide optical fiber 3 forms.The input of the wherein outfan of pulse optical fiber 1 and fiber amplifier 2 connects, and optical fiber is put
The input of the outfan of big device 2 and germanium oxide optical fiber 3 connects.
In the present embodiment, pulse optical fiber 1 selects electrical modulation pulse optical fiber, and its pulse width is 1ns, weight
Complex frequency is 100kHz, centre wavelength is 1.55 μm, and output optical fibre is single-mode quartz optical fibers.
In the present embodiment, fiber amplifier 2 is backward cladding pump erbium-ytterbium co-doped fiber amplifier, can be 1.55 μm of arteries and veins
Impulse light provides the gain amplifier more than 20dB.
In the present embodiment, germanium oxide optical fiber 3 is step index type refractive index structures optical fiber, and core material is germanium oxide, bag
Layer material is quartz, a size of 3.5/125 μm of its fibre core/cladding diameter, and fibre core numerical aperture is 0.6.Germanium oxide optical fiber 3 exists
At 1.55 mum wavelengths, basic mode effective core area is 3.4 μm2, nonlinear factor is 11.8 (W km)-1.Aoxidize in the present embodiment
The zero dispersion point of germanium optical fiber 3 is 1.43 μm, and its dispersion curve ensure that output spectrum is long after 1.5 mu m waveband laser pumping
Ripple can be expanded to more than 3 μm, and shortwave dispersive wave can reach visible ray simultaneously；The length of germanium oxide optical fiber 2 in the present embodiment
Spend for 0.8m.
1.5 mu m waveband pulse optical fibers 1 and fiber amplifier 2, fiber amplifier 2 and germanium oxide light in the present embodiment
Coupling between fine 3, all by the way of directly melting connects, the mode that this melting connects can provide higher coupling efficiency,
Increase the stability of light source.
Fig. 2 gives the group velocity curve figure of germanium oxide optical fiber 3 in the present embodiment.In figure solid line represents germanium oxide optical fiber 3
Group velocity curve, dashed lines labeled two wavelength of group velocity equal (that is, phase matched).When super continuous spectrums spectrum to
When long wave is expanded, the dispersive wave with long wave phase matched can be produced.In Fig. 2, two wavelength of labelling are respectively 656nm and 3200nm,
Their corresponding group velocitys are 1.828nm/ps.
The work process of the present embodiment is as follows.The operation wavelength of described pulse optical fiber 1 is 1.5 μm, pulsed light
Fibre laser 1 exports 1.5 μm of pulse lasers.Fiber amplifier 2 is erbium-ytterbium co-doped fiber amplifier；Fiber amplifier 2 is by pulse
1.5 μm of pulse lasers of optical fiber laser 1 output amplify, and output peak power is 1.5 μm of pulse lasers of 6kW；Further,
This pulse laser is used as driving source, it is super continuous at 0.6～3.2 μm that one section of germanium oxide optical fiber 3 of pumping produces output spectrum
Spectrum LASER Light Source.
Fig. 3 be in the present embodiment produce super continuous spectrums LASER Light Source spectrogram it can be seen that output spectrum cover from
0.6 to 3.2 μm of scope, under conditions of not considering 1.5 μm of pumping residual peaks, the 20dB spectrum of this super continuous spectrums LASER Light Source
Band is wider than 2400nm, and corresponding wavelength scope is 675～3072nm.
The foregoing is only preferred embodiment of the present utility model, be not limited to this utility model, for this
For the technical staff in field, this utility model can have various modifications and variations.All of the present utility model spirit and principle
Within, any modification, equivalent substitution and improvement made etc., should be included within protection domain of the present utility model.
Claims (7)
1. a kind of super large bandwidth super continuous spectrums LASER Light Source, including pulse optical fiber, fiber amplifier and germanium oxide optical fiber；
The input of the wherein outfan of pulse optical fiber and fiber amplifier connects, the outfan of fiber amplifier and germanium oxide
The input of optical fiber connects.
2. super large bandwidth super continuous spectrums LASER Light Source as claimed in claim 1 is it is characterised in that described germanium oxide optical fiber adopts
Step index type refractive index structures optical fiber, photon crystal structure optical fiber or microstructured optical fibers.
3. super large bandwidth super continuous spectrums LASER Light Source as claimed in claim 1 is it is characterised in that described pulse optical fiber
For 1.5 mu m waveband pulse optical fibers；The pulse width of described pulse optical fiber is more than 1ps, less than 20ns, and peak value
Power is higher than 10W.
4. super large bandwidth super continuous spectrums LASER Light Source as claimed in claim 1 is it is characterised in that described fiber amplifier is
1.5 mu m waveband fiber amplifiers；The output pulse width of described fiber amplifier is more than 1ps, and less than 20ns, and peak power is high
In 1000W.
5. super large bandwidth super continuous spectrums LASER Light Source as claimed in claim 1 is it is characterised in that the fibre of described germanium oxide optical fiber
Core material is less than 6 μm using oxidation germanium material, core diameter, and corresponding basic mode effective core area is less than 100 μm2, in 1.5 μm of ripples
Long optical nonlinearity coefficient is more than 2 (W km)-1；The clad material of described germanium oxide optical fiber can adopt quartz material, or
Fluoride materials.
6. super large bandwidth super continuous spectrums LASER Light Source as claimed in claim 1 it is characterised in that described fiber amplifier defeated
Going out the connected mode between optical fiber and described germanium oxide optical fiber is that melting is connected.
7. super large bandwidth super continuous spectrums LASER Light Source as claimed in claim 1 is it is characterised in that described pulse optical fiber
Wavelength be located at the anomalous dispersion region of germanium oxide optical fiber, and near fiber zero dispersion point position.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105762626A (en) * | 2016-05-23 | 2016-07-13 | 中国人民解放军国防科学技术大学 | Ultra-large bandwidth super-continuum spectrum laser source |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105762626A (en) * | 2016-05-23 | 2016-07-13 | 中国人民解放军国防科学技术大学 | Ultra-large bandwidth super-continuum spectrum laser source |
| CN105762626B (en) * | 2016-05-23 | 2018-06-15 | 中国人民解放军国防科学技术大学 | A kind of super large bandwidth super continuous spectrums laser light source |
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