CN108258571A - Microballoon cavity laser preparation method based on superpower upper conversion multicomponent glass material - Google Patents
Microballoon cavity laser preparation method based on superpower upper conversion multicomponent glass material Download PDFInfo
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- CN108258571A CN108258571A CN201810116363.XA CN201810116363A CN108258571A CN 108258571 A CN108258571 A CN 108258571A CN 201810116363 A CN201810116363 A CN 201810116363A CN 108258571 A CN108258571 A CN 108258571A
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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
- H01S3/0602—Crystal lasers or glass lasers
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/11—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen
- C03C3/112—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen containing fluorine
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C4/00—Compositions for glass with special properties
- C03C4/12—Compositions for glass with special properties for luminescent glass; for fluorescent glass
Abstract
Based on the microballoon cavity laser preparation method of superpower upper conversion multicomponent glass material, belong to Microsphere Cavities field of laser device technology.Including：The preparation of multicomponent fluorosilicate glass ion co-doped Yb Er.The preparation of glass microsphere ion co-doped Yb Er.Light path coupling is carried out to glass microsphere light path.To prepared microballoon with regard to the encapsulation of laser.The invention combination Yb Er ions convert the characteristics of quantum efficiency and glass microsphere high quality factor in the superelevation in fluorosilicate glass, solve the problems such as situation of uncontrollable crystallization and excessively high pumping threshold in existing up-conversion fiber laser development process.The present invention is coupled by light path realizes that pump light intensities substantially enhance, and the resonance of Whispering-gallery-mode, the final laser output for realizing narrow linewidth are realized in the fluosilicate microballoon of Yb Er codopes.The inventive method preparation process is simple, belongs to the wave band of transmission loss minimum in the seawater, available for naval equipment, solves detection of the naval to submarine target, overocean communications problem.
Description
Technical field
The invention belongs to Microsphere Cavities field of laser device technology, and in particular to based on superpower upper conversion multicomponent glass material
Microballoon cavity laser preparation method.
Background technology
Optical Microsphere Cavities in the microballoon that light beam can be tied up to very little, have higher energy density and smaller mould field body
Product, the optical mode that can stablize transmission in Microsphere Cavities are referred to as Whispering-gallery-mode.British scientist Lord Rayleigh
It studies sound and uploads sowing time in the St. Paul's Cathedral corridor of bending, find clearly hear two with oneself wide apart
Individual whispers in the other end of of claustra, so the pattern of this sound transmission is referred to as " whispering gallery mode ".Thing
In reality, in Beijing, the Echo Wall of the Temple of Heaven also has the phenomenon that similar.It is reflected similar to sound wave in metope, when light is dredged from light is close to light
When medium incident and sufficiently large incidence angle, it can also be totally reflected on two media surface, then in the high refractive index of bending
There is also optics Whispering-gallery-modes for medium interface.In the boundary of closed housing, light can then be trapped in inside cavity always
Keep stable transmission mode.The advantages that using the high q-factor of Microsphere Cavities and micro-nano size, in quantrm electrodynamics, chamber quantum force
It learns, photonic computer, non-linear phenomena, optical sensing, optical fiber laser, fiber coupler and wave filter have very extensive answer
With.
Traditional Echo Wall optical microcavity includes micro-loop chamber, Microsphere Cavities, micro- bottle of chamber, micro- disk chamber and microvesicle chamber, because of microballoon
Chamber is easier to obtain high quality factor, and manufacture craft is ripe compared to other resonators, can be easier
Microballoon of the scale in optical wavelength magnitude is obtained, the application in optical fiber laser is more and more extensive.
Since the invention of first generation glass laser fibre laser in 1964 in the world, optical fiber laser is in fiber optic communication, soon
The fields such as fast photoelectronics, nonlinear optics, light sensing are more and more important.Optical fiber laser has manufacture at low cost, is easy to collect
Cheng Hua makes relatively easily, and overall volume is small, and output wavelength is tunable, suitable for the working environment of various complexity, higher work(
The series of advantages such as rate, but compared to solid state laser, the pulse of output single mode is still smaller, so reducing threshold value, widens wavelength
Tuning range becomes particularly important.Over from 2005 to 2010 year, optical fiber laser to sell volume rapid with 35% speed every year
It is soaring.
On the other hand, up-conversion luminescence phenomenon refers to that material by the photon excitation of low energy, launches the photon of high-energy.
From energy point of view, upper conversion is a kind of anti-Stokes luminescence phenomenon.Up-conversion luminescent material is not deposit in nature
, it can only be synthesized under artificial condition.Although in the YbPO that no active ions adulterate4In crystalline material, swash in 980nm laser
Up-conversion luminescence can also be observed by giving, but most of up-conversion luminescence is all to pass through addition in suitable host material
What Doped ions were realized.Doped ions include sensitized ions and active ions, wherein, active ions are shining for up-conversion luminescence
Center, sensitizer ion absorbs excitation energy and transfers energy to luminescent center ion, so as to obtain luminescence enhancement.It is general and
Speech, in addition to Y3+、La3+And Sc3+These three rare earth ions, other rare earth ions theoretically can be used as up-conversion luminescence
Active ions.Divide according to up-conversion luminescence mechanism, mainly there is transfer process in following four.
(1) the upper conversion based on energy transmission
Upper transfer process based on energy transmission is that the energy transmission between two ion energy levels is related.Wherein, it mixes
One, two ions of energy transmission are three-level structure ion, another is dual intensity level structure ion, and dual intensity grade ion
Excitation state shine energy level and three-level ion metastable energy level energy it is close.During up-conversion luminescence, two ions
Ground state electron be excited together, transit to metastable energy level, energy is passed through energy resonance by dual intensity grade ion, and (electric multipole moment is made
With) three-level ion is transmitted to, last electronics is from metastable-state transition to ground state.At this point, dual intensity level structure ion is by energy transmission
To the electronics that metastable energy level is in three-level structure ion, shine upper energy level so as to be excited to excitation state, finally by sending out
Energy level falls back to ground state level on light, launches the photon of a short wavelength.The most effective system of most study had in recent years：
Yb3+/Er3+,Yb3+/Tm3+,Yb3+/Ho3+, it is mostly based on the luminous mechanism of energy transfer up-conversion.By it is above it is described upper turn
Luminescence mechanism is changed it is found that the upper transfer process based on energy transmission is related to the phase interaction between dual intensity grade and three-level ion energy level
With, and this interaction size depends greatly on interionic distance.It, can be interionic by controlling based on this
Regulate and control the up-conversion luminescence efficiency based on energy transmission apart from size, such as：It can be by adjusting the doping concentration of two kinds of ions
And then improve up-conversion luminescence.
(2) the upper conversion based on Excited-state Absorption
Up-conversion luminescence process based on Excited-state Absorption is to realize to absorb and shine by single ion.Excited-state Absorption
Up-conversion luminescence efficiency be slightly below the efficiency that energy transfer up-conversion shines.The ion for participating in the up-conversion luminescence is usually three
Level structure ion, wherein, the fluorescence lifetime of the metastable energy level of light emitting ionic must long enough, so metastable energy level
Energy can be fully absorbed.When the energy of excitation photon and the energy difference of metastable state to ground state level are close, the centre of luminescence
Ion can generate ground state level absorption, so as to which ground state electron is excited to metastable energy level.The electronics of luminescent center ion passes through
Ground state absorption and metastable state absorb, and reach energy level on luminous energy level, then return to ground state level by the upper energy level transition that shines, produce simultaneously
A raw high-energy, the photon transmitting of short wavelength.It is main that the material based on Excited-state Absorption up-conversion luminescence can be obtained at present
It concentrates in rare earth ion doped material, Doped ions have：Er3+,Tm3+,Nd3+,Ho3+Deng.
(3) the upper conversion based on cooperative sensitization process
Compared to two kinds of front upconversion spectroscopy, the quantum efficiency of the up-conversion luminescence based on cooperative sensitization process is lower.
The sensitization of transfer process and active ions are all dual intensity level structure ions in participation, and interionic interacts.Wherein,
Two sensitized ions absorb excitation energy, and transfer energy to active ions simultaneously, make the ground state level electronics of active ions
The upper energy level that shines is transitted to, last electronics falls back to ground state level from luminous energy level, and emits high energy, a short wavelength photons.
On cooperative sensitization in converting system, Yb3+/Tb3+And Yb3+/Eu3+Ion is co-doped with being exactly very typical example.In Yb3+/Tb3+
And Yb3+/Eu3+In the upper transfer process that ion is co-doped with, two Yb3+Ion absorbs excitation energy simultaneously, then transfers energy to
One Tb3+Or Eu3+Ion generates the up-conversion luminescence of visibility region.This upper transfer process is comprising there are three the mutual of ion
Effect, and the distance of these three ions will be leaned on very near, and therefore, this up-conversion luminescence generally can only be certain specific
It is generated in material.
(4) it is converted in cooperation
Transfer processes are gone up compared to above-mentioned three kinds, the luminous efficiency converted in cooperation is lower, it is a kind of very special
Upper transfer process.It is quite similar with the upper transfer process based on energy transmission, in cooperation in transfer process also include there are two from
Interaction between son, unlike, the ion of two interactions is identical ion, and join in transfer process in cooperation
There is the structure of dual intensity grade with two same ions of cooperation up-conversion luminescence.When two ions of the same race lean on it is near enough when
It waits, ion carries out coupling and forms ion pair, and the energy level of ion is reset, and in visible light region, formation one is virtual shines
Upper energy level, then fall back to ground state from the upper energy level that shines, at the same time launch a visible short wavelength photons.So far,
Cooperation up-conversion luminescence is only in Yb3+It is obtained in the higher special material system of ion doping concentration, such as YbPO4Crystal etc..However,
In Yb3+The CaF of ion doping2In host material, Yb3+Easily aggregation forms cluster to ion, works as Yb3+Ion doping concentration is relatively low
When can also observe cooperation up-conversion luminescence.
Based on the level structure that up-conversion luminescence feature and rare earth ion are abundant, at present about the research of up-conversion luminescence
It has focused largely in rare earth ion doped material.
Since rare earth ion generally has abundant level structure and the absorption of efficient metastable state and emission characteristics, energy
It is enough to realize up-conversion luminescence in multiple wave bands.In addition, the up-conversion luminescence of rare earth ion is to be attributed to its internal layer f-f electronics mostly
Transition, their luminous peak position is fixed and efficiency is higher.Under normal circumstances, in different host materials, mostly
Rare earth ion Upconversion luminescence is very fixed.According to the elaboration of front upconversion luminescence mechanism it is found that converting hair on some
Photoreduction process also needs to carry out energy transmission by sensitized ions, and sensitizer ion is usually required for having dual intensity level structure.Yb3+From
Son has simple dual intensity level structure, in numerous rare earth ions, is most suitable for being used as sensitizer ion.In addition, Yb3+Ion
Emission peak and absorption peak are in 950nm~1000nm regional extents, so, Yb3+Ion can either be commercial well
980nm lasers excite.Near 980nm wavelength, Yb3+Ion has very high absorption cross-section (~9.11 × 10-21cm-2)。
Due to Tm3+、Er3+、Ho3+Energy level can be with Yb3+The energy level of ion is preferably matched, their frequent and Yb3+Be co-doped with by with
Make activator ion.Near by 980nm during laser excitation, Yb3+Ion can be good at absorbing excitation energy and energy passed
Pass Tm3+、Er3+、Ho3+Light emitting ionics are waited, so as to obtain the up-conversion luminescence of high conversion efficiency.In up-conversion.Matrix
Material provides luminous environment to luminescent center ion, and the chemical constitution of host material is largely affected with physical property
The up-conversion luminescence efficiency of activator ion.Under normal conditions, the higher host material of up-conversion luminescence efficiency must have with
Under several features：(1) host material phonon energy is relatively low so that by material lattice vibration generate radiationless transition probability compared with
Small, luminous efficiency is higher.(2) host material to rare earth ion have sufficiently large solvability so that centre of luminescence quantity compared with
It is more；(3) good thermal stability and chemical stability；(4) host material will have compared with high transmittance infrared light so that excitation
Light can be fully utilized.Y3+、Lu3+And Sc3+Plasma has similar chemical property and object to numerous rare earth activators ions
Rationality matter and identical valence state, therefore, the compound-material containing Y, Lu and Sc element are often used as realizing efficiently upper convert
Luminous host material.Up to the present, the systems such as fluoride, sulfide, oxyfluoride and oxide based on above-mentioned element
Material be used for up-conversion luminescence, and be widely studied and report.In addition, some fluoride materials based on alkaline-earth metal
(CaF2,BaF2And SrF2) used also as up-conversion luminescence matrix and by numerous studies.In numerous fluoride materials,
NaLnF4Material has relatively low phonon energy and prominent chemical stability, is acknowledged as the highest base of up-conversion luminescence efficiency
Material.NaLnF4Crystal has two kinds of crystalline phases of cubic phase and hexagonal phase, and hexagonal phase material is with more higher than cubic phase
Upper transfer efficiency, therefore, hexagonal phase NaLnF4Develop into the upper conversion host material studied the most extensively.
Own history of the warp with decades of research about rare earth ion doped up-conversion luminescent material, but rare earth ion
Adulterating up-conversion luminescent material has excellent luminescent properties and good practical performance, in current field of light emitting materials still
It is a research hotspot.
Invention content
The purpose of the present invention is to provide can stablize output laser, there is extremely low threshold value, super-narrow line width based on
The microballoon cavity laser of superpower upper conversion multicomponent glass material.
The purpose of the present invention is realized by following technical solution：
Based on the microballoon cavity laser preparation method of superpower upper conversion multicomponent glass material, the system comprising host glass
It is standby, the doping of rare earth ion, the preparation of glass microsphere, the outgoing of coupling pump light and narrow-linewidth laser.Glass matrix used
Each raw material molar percentage be 70SiO2-15KF-15ZnF2A concentration of 1.5YbF of Doped ions3-0.1Er2O3。
The preparation process of micro-cavity laser includes the preparation of glass and the preparation following steps of microballoon：
The raw material of high-purity is weighed according to a certain ratio, puts and stirs in the ball mill, is sufficiently mixed various raw materials；
Then mixture is fitted into platinum crucible, is placed in 1600 DEG C of high temperature furnace inside holding 30min；
Fiber core will be made after the glass metal wire drawing of melting, cooling；
Drawing cone is carried out to the glass optical fiber of multi-component doped using carbon dioxide laser, at the end of multicomponent glass optical fiber
End hangs up a weight, and the laser that carbon dioxide laser exports is focused on to the glass of multi-component doped using a condenser lens
On glass optical fiber, the power of carbon dioxide laser is slowly increased, when glass optical fiber reaches the softening point of itself, due to weight
Effect, glass optical fiber slowly drop, and fibre diameter is gradually reduced, until the tapered diameter of doped-glass optical fiber connector is 10 μm
Left and right, you can stop heating, adjust the focal position of carbon dioxide laser output light later, focus of the light beam into conical fiber
End, cone-shaped glass optical fiber connector starts to shrink upwards and is melt into a bead due to the reason of surface tension, controls heating
Number can obtain desired microsphere diameter.Cone system is drawn to prepare the general of 2 μm or so thicknesses of a root followed by ceramics
Logical silica conical fiber obtains silica conical fiber using homemade drawing cone system.
The general single mode fiber both ends prepared are finally coupled with to the input system of light source and the collection system of light source
In system, the coupling of multi-component doped microballoon and silica conical fiber will be controlled with precision three-dimensional platform, realizes that laser exports.
Obtain the concrete principle of laser output：
Single mode laser light source exports 980nm pump lights, by optical path protecting device (preventing reflected light from entering light source) incidence
Into general single mode silica conical fiber, since the most thin cone waist of conical fiber only has several microns, this wavelength dimension
Optical fiber have very strong evanscent field, using an accurate three-dimensional platform, control the diameter of conical fiber and microballoon
It realizes efficient coupling, Whispering-gallery-mode is formed in the coupling pump light to microballoon in conical fiber, in the equatorial plane of microballoon
It is transmitted, when Er-Yb ions are excited by 980nm pump lights, in ground state2F7/2(Yb3+) electron transition to excitation
State2F5/2Energy level, Yb3+Only there are two energy levels, and the electronics in excitation state is to ground state transition, and the energy transmission of generation is to Er3+.Together
When, Er3+Absorb 980 photons, ground state level4I15/2Electronics be excited to intermediate metastable energy level4I11/2, in metastable
The electronics of state energy level continues to absorb from pump light and Yb3+980 photons, generate Excited-state Absorption, electronics continues up energy level
Transition reaches4F7/2Energy level, in high level4F7/2Electronics by radiation and nonradiative transition, to low-lying level track, fall after rise
It arrives4S3/2The electronics of energy level by radiation transistion, returns to ground state level again, generates the photon of a 547nm.And4F9/2On energy level
Electronics returns to4I15/2Energy level can give off a 675nm photon.Its luminescence process is also denoted as
2F5/2(Yb3+)+4I15/2(Er3+)→2F7/2(Yb3+)+4I11/2(Er3+)
Nonradiative transition：
4I11/2(Er3+)→4I13/2(Er3+)2F5/2(Yb3+)+4I13/2(Er3+)→2F7/2(Yb3+)+4I9/2(Er3+)
4F7/2(Er3+)→2H11/2(Er3+)2F5/2(Yb3+)+4I11/2(Er3+)→2F7/2(Yb3+)+4I7/2(Er3+)
2H11/2(Er3+)→4S3/2(Er3+)
4S3/2(Er3+)→4F9/2(Er3+)
4F9/2(Er3+)→4I9/2(Er3+)
The high q-factor of microballoon so that the energy level transition that the 980nm pump lights transmitted in microballoon are easy to excitation doping particle is real
It is now upper to convert.
When pumping threshold is relatively low, the 980nm pumping wavelengths in microballoon can not make the particle beams invert to be formed it is stable
Laser exports, and continues to increase pump light source, since reversion of the population on Doped ions energy level forms laser inside microballoon
Output, and the laser exported will form the Whispering-gallery-mode for stablizing transmission again in microballoon, regulate and control to bore by three-dimensional platform
The coupling of shape optical fiber and microballoon can obtain the multi-mode laser output of 420nm, 550nm and 660nm from spectrometer.
Compared to traditional optical fiber laser, the present invention provides a kind of high q-factor that perfect surface is formed by surface tension
Multicomponent glass Microsphere Cavities carry out pump light injection by the optical taper of high coupling efficiency and emit the glass echo that laser is collected
Wall mode laser, the laser have extremely low threshold value.The transfer efficiency of Microsphere Cavities pump light can improve several orders of magnitude,
So that Low threshold laser is output into possibility.Secondly it is different with drawing optical fiber, when making glass microsphere chamber device, heating temperature
It is near the melting temperature of glass, and the efficiency of heating surface is high, and heating time is extremely short, can fast skip the recrystallization temperature of glass, keep away
Exempt from glass during reheating and generate crystallization.
The beneficial effects of the present invention are：
By CO2Prepared by laser, the Microsphere Cavities surface formed by surface tension effect is perfect, has high Q values, system
The laser threshold made is extremely low, overcomes tens micron dimension diameter high q-factor Microsphere Cavities and makes the problem of difficult.
It being injected using the pump light of micro-nano fiber coupled laser and collects transmitting laser, coupling efficiency greatly improves,
Solve the problems, such as that Whispering-gallery-mode micro-cavity laser output power is low low with efficiency is collected.
The up-conversion luminescence quantum efficiency of selected glass ingredient and Doped ions is up to more than 1%, so far
The so high glass of upper conversion quantum efficiency or the report of optical fiber are never crossed, it can be achieved that efficient, based on upper conversion effect
The narrow linewidth bluish-green laser output answered.
Description of the drawings
Fig. 1 is rare earth ion up-conversion luminescence spectrogram；
Fig. 2 is the laser output spectrum figure of microsphere laser device.
Specific embodiment
The specific embodiment of the present invention is described further below in conjunction with the accompanying drawings：
Based on the microballoon cavity laser preparation method of superpower upper conversion multicomponent glass material, the system comprising host glass
It is standby, the doping of rare earth ion, the preparation of glass microsphere, the outgoing of coupling pump light and narrow-linewidth laser.Glass matrix used
Each raw material molar percentage be 70SiO2-15KF-15ZnF2A concentration of 1.5YbF of Doped ions3-0.1Er2O3。
The preparation process of micro-cavity laser includes the preparation of glass and the preparation following steps of microballoon：
The raw material of high-purity is weighed according to a certain ratio, puts and stirs in the ball mill, is sufficiently mixed various raw materials；
Then mixture is fitted into platinum crucible, is placed in 1600 DEG C of high temperature furnace inside holding 30min；
Fiber core will be made after the glass metal wire drawing of melting, cooling；
Drawing cone is carried out to the glass optical fiber of multi-component doped using carbon dioxide laser, at the end of multicomponent glass optical fiber
End hangs up a weight, and the laser that carbon dioxide laser exports is focused on to the glass of multi-component doped using a condenser lens
On glass optical fiber, the power of carbon dioxide laser is slowly increased, when glass optical fiber reaches the softening point of itself, due to weight
Effect, glass optical fiber slowly drop, and fibre diameter is gradually reduced, until the tapered diameter of doped-glass optical fiber connector is 10 μm
Left and right, you can stop heating, adjust the focal position of carbon dioxide laser output light later, focus of the light beam into conical fiber
End, cone-shaped glass optical fiber connector starts to shrink upwards and is melt into a bead due to the reason of surface tension, controls heating
Number can obtain desired microsphere diameter.Cone system is drawn to prepare the general of 2 μm or so thicknesses of a root followed by ceramics
Logical silica conical fiber obtains silica conical fiber using homemade drawing cone system.
The general single mode fiber both ends prepared are finally coupled with to the input system of light source and the collection system of light source
In system, the coupling of multi-component doped microballoon and silica conical fiber will be controlled with precision three-dimensional platform, realizes that laser exports.
Obtain the concrete principle of laser output：
Single mode laser light source exports 980nm pump lights, by optical path protecting device (preventing reflected light from entering light source) incidence
Into general single mode silica conical fiber, since the most thin cone waist of conical fiber only has several microns, this wavelength dimension
Optical fiber have very strong evanscent field, using an accurate three-dimensional platform, control the diameter of conical fiber and microballoon
It realizes efficient coupling, Whispering-gallery-mode is formed in the coupling pump light to microballoon in conical fiber, in the equatorial plane of microballoon
It is transmitted, when Er-Yb ions are excited by 980nm pump lights, in ground state2F7/2(Yb3+) electron transition to excitation
State2F5/2Energy level, Yb3+Only there are two energy levels, and the electronics in excitation state is to ground state transition, and the energy transmission of generation is to Er3+.Together
When, Er3+Absorb 980 photons, ground state level4I15/2Electronics be excited to intermediate metastable energy level4I11/2, in metastable
The electronics of state energy level continues to absorb from pump light and Yb3+980 photons, generate Excited-state Absorption, electronics continues up energy level
Transition reaches4F7/2Energy level, in high level4F7/2Electronics by radiation and nonradiative transition, to low-lying level track, fall after rise
It arrives4S3/2The electronics of energy level by radiation transistion, returns to ground state level again, generates the photon of a 547nm.And4F9/2On energy level
Electronics returns to4I15/2Energy level can give off a 675nm photon.Its luminescence process is also denoted as
2F5/2(Yb3+)+4I15/2(Er3+)→2F7/2(Yb3+)+4I11/2(Er3+)
Nonradiative transition：
4I11/2(Er3+)→4I13/2(Er3+)2F5/2(Yb3+)+4I13/2(Er3+)→2F7/2(Yb3+)+4I9/2(Er3+)
4F7/2(Er3+)→2H11/2(Er3+)2F5/2(Yb3+)+4I11/2(Er3+)→2F7/2(Yb3+)+4I7/2(Er3+)
2H11/2(Er3+)→4S3/2(Er3+)
4S3/2(Er3+)→4F9/2(Er3+)
4F9/2(Er3+)→4I9/2(Er3+)
The high q-factor of microballoon so that the energy level transition that the 980nm pump lights transmitted in microballoon are easy to excitation doping particle is real
It is now upper to convert.
When pumping threshold is relatively low, the 980nm pumping wavelengths in microballoon can not make the particle beams invert to be formed it is stable
Laser exports, and continues to increase pump light source, since reversion of the population on Doped ions energy level forms laser inside microballoon
Output, and the laser exported will form the Whispering-gallery-mode for stablizing transmission again in microballoon, regulate and control to bore by three-dimensional platform
The coupling of shape optical fiber and microballoon can obtain the multi-mode laser output of 420nm, 550nm and 660nm from spectrometer.
Compared to traditional optical fiber laser, the present invention provides a kind of high q-factor that perfect surface is formed by surface tension
Multicomponent glass Microsphere Cavities carry out pump light injection by the optical taper of high coupling efficiency and emit the glass echo that laser is collected
Wall mode laser, the laser have extremely low threshold value.The transfer efficiency of Microsphere Cavities pump light can improve several orders of magnitude,
So that Low threshold laser is output into possibility.Secondly it is different with drawing optical fiber, when making glass microsphere chamber device, heating temperature
It is near the melting temperature of glass, and the efficiency of heating surface is high, and heating time is extremely short, can fast skip the recrystallization temperature of glass, keep away
Exempt from glass during reheating and generate crystallization.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, that is made any repaiies
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (3)
1. the microballoon cavity laser preparation method based on superpower upper conversion multicomponent glass material, which is characterized in that including following
Step：
(1) host glass is prepared；
(2) doping with rare-earth ions；
(3) glass microsphere is prepared；
(4) coupling pump light；
(5) it is emitted narrow-linewidth laser.
2. the microballoon cavity laser preparation method according to claim 1 based on superpower upper conversion multicomponent glass material,
It is characterized in that, the molar percentage of each raw material of described step (1) the mesostroma glass is 70SiO2-15KF-15ZnF2, mix
A concentration of 1.5YbF of heteroion3-0.1Er2O3。
3. the microballoon cavity laser preparation method according to claim 1 based on superpower upper conversion multicomponent glass material,
It is characterized in that, the step (3) is specially：
(3.1) raw material of high-purity is weighed according to a certain ratio, puts and stir in the ball mill, be sufficiently mixed various raw materials；
(3.2) mixture is fitted into platinum crucible, is placed in 1600 DEG C of high temperature furnace inside holding 30min；
(3.3) fiber core will be made after the glass metal wire drawing of melting, cooling；
(3.4) drawing cone is carried out to the glass optical fiber of multi-component doped using carbon dioxide laser, in multicomponent glass optical fiber
End hangs up a weight, and the laser that carbon dioxide laser exports is focused on multi-component doped using a condenser lens
On glass optical fiber, the power of carbon dioxide laser is slowly increased, until the tapered diameter of doped-glass optical fiber connector is 10 μm,
Stop heating；
(3.5) focal position of carbon dioxide laser output light is adjusted, the end of conical fiber is focused of the light beam into, is thought
The microsphere diameter wanted；
(3.6) cone system is drawn to prepare the general silica conical fiber of 2 μm or so thicknesses of a root using ceramics, utilizes self-control
Drawing cone system obtain silica conical fiber；
(3.7) cone system is drawn to prepare the general silica conical fiber of 2 μm or so thicknesses of a root using ceramics, utilizes self-control
Drawing cone system obtain silica conical fiber；
(3.8) the general single mode fiber both ends prepared are coupled with the input system of light source and the collection system of light source
In, the coupling of multi-component doped microballoon and silica conical fiber will be controlled with precision three-dimensional platform.
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