CN108761957A - The Non-linear coupling method of the secondary cascade efficient frequency conversion of infrared band laser light source in realization - Google Patents
The Non-linear coupling method of the secondary cascade efficient frequency conversion of infrared band laser light source in realization Download PDFInfo
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- CN108761957A CN108761957A CN201810328824.XA CN201810328824A CN108761957A CN 108761957 A CN108761957 A CN 108761957A CN 201810328824 A CN201810328824 A CN 201810328824A CN 108761957 A CN108761957 A CN 108761957A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
- G02F1/3534—Three-wave interaction, e.g. sum-difference frequency generation
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
- G02F1/3544—Particular phase matching techniques
Abstract
The invention discloses a kind of Non-linear coupling methods of the secondary cascade efficient frequency conversion of infrared band laser light source in realize, include the selection of (1) transfer process coupling matrix；(2) phase misalignment harmonic quantity and Stark shift parameter definition；(3) cascade wavelength-conversion process stiffness of coupling modulation；(4) selection of laser light source and nonlinear crystal；(5) realize signal light to the wavelength converting process of middle infrared band.It is theoretical that this method is based on Stark chirp Adiabatic Fast Passage, it can solve secondary cascade nonlinear frequency conversion and design modulation problems in the stiffness of coupling in crystal length direction, and more process quasi-phase matcheds are realized in nonlinear crystal using reversion quasi-phase matching according to coupling paameter, the middle infrared band laser light source of great utility value is obtained with this.
Description
Technical field
Infrared waves in being realized the present invention relates to a kind of coupling process that can generate new wavelength laser, in particular to a kind of energy
The Non-linear coupling method of the secondary cascade efficient frequency conversion of section laser light source, for generating in military affairs, the fields such as environment detection
Middle infrared band laser light source with utility value.
Background technology
The advantage that application of the mid-infrared light source in many fields has other wave band of laser incomparable, and it is infrared in generating
The main method of laser is mainly the frequency conversion of nonlinear optics, such as optical parametric oscillation (OPO), difference frequency conversion etc..In wavelength
In transfer process, in the laser light incident to nonlinear dielectrics of different frequency, three wave mixing or cascade conversion process are generated.
In order to realize efficient frequency conversion, need to meet phase-matching condition, and the incident angle of input light and nonlinear dielectric material
The parameter of material such as temperature, length etc. can all impact phase matched so that transformation efficiency is relatively low.
Haim professors Suchowski in 2008 for the first time use for reference Adiabatic Evolution theory to non-linear from Atomic Physics field
In optics, Adiabatic Fast Passage (RAP) method in analogy atom population, it is proposed that in frequency obtain high efficiency energy conversion and
The adiabatic scheme of big bandwidth response, and its corresponding adiabatic condition is provided, theoretically realize almost complete conversion.
The wave-length coverage obtained by adiabatic three wave mixing process is still smaller, 2012, Gil Porat et al. be based on by
It is theoretical to swash Raman thermal insulation channel, proposes secondary cascade wavelength three wave mixing transfer process, and utilize phasing back quasi-phase matched
Technology Modulation and Nonlinear crystal, the cascade difference frequency for experimentally realizing mid-infrared laser generate.It manages in excited Raman thermal insulation channel
It needs to meet anti-intuitive coupling sequence by atom adiabatic conversion process and corresponding adiabatic condition, restrictive condition is more.
And the another kind for being equally used for atom population transmission is theoretical -- Stark chirp Adiabatic Fast Passage is theoretical, using one
Beam is that frequency is wp1Pumping pulse, particle from ground state 1>It is energized into excitation state 2>, a branch of is the w that frequency issPulse, driving
Energy level 2>To 3>Transition, it is last it is a branch of be w that frequency isstarkPulse tunes total mismatching angle of two processes, selection appropriate
Time delay between three pulses, whether intuitive sequence or anti-intuitive sequence, can realize that i on population shifts institute
The level-crossing point needed, and intermediate state is made to keep very low level, complete the complete i on population transfer between state 1 and state 3.
Invention content
The object of the present invention is to provide the secondary cascade efficient frequency conversions of infrared band laser light source in a kind of realize
Non-linear coupling method, this method are based on Stark chirp Adiabatic Fast Passage theory, can solve secondary cascade non-linear frequency
It converts the stiffness of coupling in crystal length direction and designs modulation problems, and reversion quasi-phase matching is utilized according to coupling paameter
More process quasi-phase matcheds are realized in nonlinear crystal, and the middle infrared band laser light source of great utility value is obtained with this.
The above-mentioned purpose of the present invention is realized by following technical solution：It is a kind of realize in infrared band laser light source two
The Non-linear coupling method of secondary cascade efficient frequency conversion, this method comprises the following steps：
(1) selection of transfer process coupling matrix；
(2) phase misalignment harmonic quantity and Stark shift parameter definition；
(3) cascade wavelength-conversion process stiffness of coupling modulation；
(4) selection of laser light source and nonlinear crystal；
(5) realize signal light to the wavelength converting process of middle infrared band.
In the present invention, the detailed process of the step (1) is as follows：
It is as follows according to the Hamiltonian matrix of Stark chirp Adiabatic Fast Passage theory
Wherein, H (t) indicates that atom-is concerned with field system with the Hamiltonian of temporal evolution, and the t expression evolution times, i is
Imaginary number and i2=-1,For Planck's constant, Ωp(t) Rabi frequency of pump field, Ω are indicateds(t) drawing of Stokes field is indicated
Than frequency, S2(t) Stark shift of intermediate level, Δ are represented2Represent the photon mismatching angle of intermediate level, Δ3It is total to represent energy level
Photon mismatching angle, Γ indicate spontaneous radiation lose rate,
By on Stark chirp Adiabatic Fast Passage theoretical origin to optics cascade wavelength convert field, matrix is determined again
Justice is as follows
Wherein, H (t) indicates that atom-is concerned with field system with the Hamiltonian of temporal evolution, z representation space evolution length,
I is imaginary number and i2=-1,For Planck's constant, κ12(z) it is the secondary stiffness of coupling for cascading first process in wavelength convert,
κ21(z) it is its complex conjugate, Δ k1For the phase misalignment dosage of this process.κ23(z) it is secondary second cascaded in wavelength convert
The stiffness of coupling of process, κ32(z) it is its complex conjugate, Δ k2For the phase misalignment dosage of this process.κ123(z) it is secondary cascade wave
Total stiffness of coupling in long transfer process, Δ k3For total phase misalignment dosage.
This matrix is selected, the coupling matrix as cascade wavelength convert.
The detailed process of the step (2) is as follows：
Indicate that optics cascades the phase of transfer process with the photon mismatching angle in Stark chirp Adiabatic Fast Passage come analogy
Position amount of mismatch, Δ2The phase misalignment dosage for indicating second process in secondary cascade wavelength-conversion process, with Δ k2Instead of Δ3
Total phase misalignment dosage in secondary cascade wavelength-conversion process is indicated, with Δ k3Instead of,
Stark shift amount S2(t) it is used for indicating total stiffness of coupling in secondary cascade wavelength-conversion process, modulates two
The coupled relation of process, the spontaneous radiation that Γ is brought lose the influence to converting system, ignore.
The detailed process of the step (3) is as follows：
Stiffness of coupling in transfer process uses three Gaussian pulse functional forms for having relative delay, as follows
Wherein, κ12Indicate the stiffness of coupling peak value of first three wave mixing process in secondary cascade change, κ23Indicate secondary
The stiffness of coupling peak value of second three wave mixing process, κ in cascade change123Indicate the coupling of two three wave mixing processes of adjusting
Intensity peak, s1Indicate the coupled delay amount during first three wave mixing, w1Indicate the span of its coupling function, s2It indicates
Coupled delay amount during second three wave mixing, w2Indicate the span of its coupling function, w3For the total stiffness of coupling of coupling function
κ123(z) span, wherein κ123> κ12,κ23, and define κ123=(κ12κ21+κ23κ32)1/2,
Wherein, Ap1Represent the complex amplitude of the first beam pump light, wp1For its frequency, Ap2The second answering for beam pump light is represented to shake
Width, wp2For its frequency, χ(2)For the second order susceptibility of crystalline material, w1For the frequency of signal light, w2For the frequency of intermediate light, w3For
The frequency of output light, kiAnd kjFor frequency wiAnd wjWave number, κijFor the stiffness of coupling peak value of transfer process, κ* jiIt is multiple altogether for it
Yoke, (i, j=1,2,3).
The detailed process of the step (4) is as follows：
Due to the adiabatic condition requirement of Stark chirp Adiabatic Fast Passage, the adiabatic wavelength convert of optically secondary cascade
It is corresponding, it is desirable that stiffness of coupling is sufficiently large, is reflected on laser pumping light source that seek to power sufficiently large, to ensure adiabatic transmission
Stablize and carries out, so,
The selection picosecond of pump light source 1 or femtosecond pulsed light source, light intensity are GW grades,
The selection picosecond of pump light source 2 or femtosecond pulsed light source, light intensity are GW grades,
It is MW grades that signal optical source 3, which selects nanosecond or femtosecond pulsed light source, light intensity,
Nonlinear crystal select mix magnesia and length in 4cm hereinafter, the high lithium columbate crystal of threshold for resisting laser damage, leads to
It crosses electric field polarization and realizes aperiodic or no periodic structure.
The detailed process of the step (5) is as follows：
The pump light and a branch of signal light of two beam different wave lengths while the lithium columbate crystal of vertical incidence periodic modulation, first
Beam pump light and signal light pass through stiffness of coupling κ in crystal12Occur a three wave mixing process, the intermediate light of generation immediately with
Second beam pump light passes through stiffness of coupling κ23Second of three wave mixing process occurs, generates final output light, among these, coupling
Intensity κ123Two three wave mixing processes are adjusted, so that signal light is completely turned in the state that the intermediate light intensity of generation keeps extremely low
It is changed to output light, the two three wave mixing processes are all simultaneous in crystal.
It realizes and is converted completely from signal light to the secondary cascade wavelength of output light through the above steps.
The primary focus of the present invention is, new modulation to stiffness of coupling theoretical using Stark chirp Adiabatic Fast Passage
Method, the method require the order of stiffness of coupling without fixed, high efficient secondary cascade wavelength convert all may be implemented, but in requirement
Between under the premise of light intensity keeps very low, anti-intuitive coupling sequence, κ can be used12Prior to κ23, κ123, and κ need to be met123Amplitude is more than
κ12, κ23, and by adjusting κ12, κ23, κ123Relative delay size, influence wavelength-conversion process, this is with previous based on being excited to draw
The secondary cascade wavelength convert coupled wave theory of graceful thermal insulation passage technology is different.
We are realized required in the secondary cascade wavelength-conversion process of modulation using phasing back quasi-phase matching
Stiffness of coupling, by change crystal duty ratio, meet theoretical design requirements in laser transmission direction, realize secondary cascade
The complete conversion of wavelength.
Description of the drawings
The present invention is described in further details in the following with reference to the drawings and specific embodiments.
Fig. 1 is the Non-linear coupling method of the secondary cascade efficient frequency conversion of infrared band laser light source during the present invention realizes
Secondary cascade wavelength convert schematic diagram, by taking secondary cascade difference frequency as an example；
Fig. 2 is the Non-linear coupling method of the secondary cascade efficient frequency conversion of infrared band laser light source during the present invention realizes
Stiffness of coupling schematic diagram, wherein abscissa is crystal length, and ordinate is relative coupling intensity；
Fig. 3 is the Non-linear coupling method of the secondary cascade efficient frequency conversion of infrared band laser light source during the present invention realizes
Light intensity of the middle input light with output light in crystal length direction changes；
Fig. 4 is the Non-linear coupling method of the secondary cascade efficient frequency conversion of infrared band laser light source during the present invention realizes
Crystal structure schematic diagram.
Specific implementation mode
The present invention it is a kind of realize in infrared band laser light source secondary cascade efficient frequency conversion Non-linear coupling side
Method includes the following steps：
(1) selection of transfer process coupling matrix；
The detailed process of step (1) is as follows：
It is as follows according to the Hamiltonian matrix of Stark chirp Adiabatic Fast Passage theory
Wherein, H (t) indicates that atom-is concerned with field system with the Hamiltonian of temporal evolution, and the t expression evolution times, i is
Imaginary number and i2=-1,For Planck's constant, Ωp(t) Rabi frequency of pump field, Ω are indicateds(t) Stokes field is indicated
Rabi frequency, S2(t) Stark shift of intermediate level, Δ are represented2Represent the photon mismatching angle of intermediate level, Δ3Represent energy level
Total photon mismatching angle, Γ indicate that rate is lost in spontaneous radiation,
By on Stark chirp Adiabatic Fast Passage theoretical origin to optics cascade wavelength convert field, matrix is determined again
Justice is as follows
Wherein, H (t) indicates that atom-is concerned with field system with the Hamiltonian of temporal evolution, z representation space evolution length,
I is imaginary number and i2=-1,For Planck's constant, κ12(z) it is the secondary stiffness of coupling for cascading first process in wavelength convert,
κ21(z) it is its complex conjugate, Δ k1For the phase misalignment dosage of this process.κ23(z) it is secondary second cascaded in wavelength convert
The stiffness of coupling of process, κ32(z) it is its complex conjugate, Δ k2For the phase misalignment dosage of this process.κ123(z) it is secondary cascade wave
Total stiffness of coupling in long transfer process, Δ k3For total phase misalignment dosage.
This matrix is selected, the coupling matrix as cascade wavelength convert.
(2) phase misalignment harmonic quantity and Stark shift parameter definition；
The detailed process of step (2) is as follows：
Indicate that optics cascades the phase of transfer process with the photon mismatching angle in Stark chirp Adiabatic Fast Passage come analogy
Position amount of mismatch, Δ2The phase misalignment dosage for indicating second process in secondary cascade wavelength-conversion process, with Δ k2Instead of Δ3
Total phase misalignment dosage in secondary cascade wavelength-conversion process is indicated, with Δ k3Instead of,
Stark shift amount S2(t) it is used for indicating total stiffness of coupling in secondary cascade wavelength-conversion process, modulates two
The coupled relation of process, the spontaneous radiation that Γ is brought lose the influence to converting system, ignore.
(3) cascade wavelength-conversion process stiffness of coupling modulation；
The detailed process of step (3) is as follows：
Stiffness of coupling in transfer process uses three Gaussian pulse functional forms for having relative delay, as follows
Wherein, κ12Indicate the stiffness of coupling peak value of first three wave mixing process in secondary cascade change, κ23Indicate secondary
The stiffness of coupling peak value of second three wave mixing process, κ in cascade change123Indicate the coupling of two three wave mixing processes of adjusting
Intensity peak, s1Indicate the coupled delay amount during first three wave mixing, w1Indicate the span of its coupling function, s2It indicates
Coupled delay amount during second three wave mixing, w2Indicate the span of its coupling function, w3For the total stiffness of coupling of coupling function
κ123(z) span, wherein κ123> κ12,κ23.And define the stiffness of coupling peak value κ for adjusting two three wave mixing processes123=
(κ12κ21+κ23κ32)1/2,
Wherein, Ap1Represent the complex amplitude of the first beam pump light, wp1For its frequency, Ap2The second answering for beam pump light is represented to shake
Width, wp2For its frequency, χ(2)For the second order susceptibility of crystalline material, w1For the frequency of signal light, w2For the frequency of intermediate light, w3For
The frequency of output light, kiAnd kjFor frequency wiAnd wjWave number, κijFor the stiffness of coupling peak value of transfer process, κ* jiIt is multiple altogether for it
Yoke, (i, j=1,2,3).
(4) selection of laser light source and nonlinear crystal；
The detailed process of step (4) is as follows：
Due to the adiabatic condition requirement of Stark chirp Adiabatic Fast Passage, the adiabatic wavelength convert of optically secondary cascade
It is corresponding, it is desirable that stiffness of coupling is sufficiently large, is reflected on laser pumping light source that seek to power sufficiently large, to ensure adiabatic transmission
Stablize and carries out, so,
The selection picosecond of pump light source 1 or femtosecond pulsed light source, light intensity are GW grades,
The selection picosecond of pump light source 2 or femtosecond pulsed light source, light intensity are GW grades,
It is MW grades that signal optical source 3, which selects nanosecond or femtosecond pulsed light source, light intensity,
Nonlinear crystal select mix magnesia and length in 4cm hereinafter, the high lithium columbate crystal of threshold for resisting laser damage, leads to
It crosses electric field polarization and realizes aperiodic or no periodic structure.
(5) realize signal light to the wavelength converting process of middle infrared band.
The detailed process of step (5) is as follows：
The pump light and a branch of signal light of two beam different wave lengths while the lithium columbate crystal of vertical incidence periodic modulation, first
Beam pump light and signal light pass through stiffness of coupling κ in crystal12Occur a three wave mixing process, the intermediate light of generation immediately with
Second beam pump light passes through stiffness of coupling κ23Second of three wave mixing process occurs, generates final output light, among these, coupling
Intensity κ123Two three wave mixing processes are adjusted, so that signal light is completely turned in the state that the intermediate light intensity of generation keeps extremely low
It is changed to output light, the two three wave mixing processes are all simultaneous in crystal.
Below by taking secondary cascade difference frequency as an example, by aperiodic lithium columbate crystal, realize infrared in from wavelength 1000nm
The Efficient Conversion of wavelength 3800nm, secondary cascade schematic diagram is as shown in Figure 1, the coupling process is as follows：
Satisfactory stiffness of coupling modulation function is chosen, respectively：
Wherein, κ12(z) it is that coupling of first three wave mixing process in the space directions z is strong in secondary cascade wavelength convert
Degree, κ12For its peak value, κ23(z) it is that coupling of second three wave mixing process in the space directions z is strong in secondary cascade wavelength convert
Degree, κ23For its peak value, κ123(z) it is the secondary total stiffness of coupling cascaded in wavelength-conversion process in the z-direction, κ123For its peak value,
According to the pulse daley that conversion needs, the coupled delay amount s during first three wave mixing is determined1=0.009m, span w1 2
=0.00003m2, the coupled delay amount s during second three wave mixing2=0.003m, span w2 2=0.00005m2, coupling
The total stiffness of coupling κ of function123(z) span w3 2=0.00009m2, adjust the stiffness of coupling peak value κ of two three wave mixing processes123
=(κ12κ21+κ23κ32)1/2,
By realizing modulation of the stiffness of coupling in crystallographic direction with superior function, meet the cross bar that light-wave energy conversion needs
Part,
Signal light wavelength λ 1=1000nm, light intensity 100MW/cm2
1 wavelength X of pump lightp1=2700nm, light intensity 300GW/cm2
2 wavelength X of pump lightp2=2900nm, light intensity 7GW/cm2
Intermediate light wavelength lambda2=1640nm, output light wavelength λ3=3800nm
Cascade difference frequency phase misalignment dosage be：
Δk1=kλ1-kλ2-kp1
Δk2=kλ2-kλ3-kp2
kj=njwj/c
Wherein, Δ k1For secondary cascade wavelength convert when, the phase misalignment dosage of first three wave mixing process, Δ k2It is
The phase misalignment dosage of two three wave mixing processes, kjFor wave number, wherein kp1For the wave number of the first beam pump light, kp2For the second beam light
Wave number, kλ1For the wave number of signal light, kλ2For the wave number of intermediate light, kλ2For the wave number of output light, refractive index n in formulajBy dispersion
Equation calculation show that default temperature is 100 degree, total phase misalignment dosage Δ k3=Δ k1+Δk2, c is the light velocity, wj(j=1,2,3)
For frequency of light wave.
Select the lithium columbate crystal for mixing magnesia, polarizability 28pm/v, according to inverted phase quasi-phase matching
(PRQPM), by above-mentioned calculated three stiffness of couplings, crystal is divided into three periods, makes to meet Λ1=Δ k1,Λ2=Δ
k2,Λ3=Δ k3,
In crystallographic direction by adjusting duty ratio, make following：
f1(z)=(2D2-1)(2D3-1)sin(πD1)
f2(z)=(2D1-1)(2D3-1)sin(πD2)
f3(z)=(2D1-1)(2D2-1)sin(πD3)
Three couples index modulation function f1(z),f2(z),f3(z) meet κ respectively12(z),κ23(z),κ123(z),
Best duty ratio arrangement is calculated by genetic algorithm,
Two beam different wave lengths are respectively 2700nm, and the pump light of 2900nm and a branch of wavelength are that 1000nm signal lights hang down simultaneously
The lithium columbate crystal of straight incidence periodic modulation, the first beam pump light and signal light pass through stiffness of coupling κ in crystal12Occur primary
Difference frequency process, generation wavelength are that the intermediate light of 1640nm passes through stiffness of coupling κ with the second beam pump light immediately23It is poor for the second time to occur
Frequency process, it is 3800nm output lights, among these, stiffness of coupling κ to generate final wavelength123Two difference frequency processes are adjusted, are being generated
Intermediate light intensity keep it is extremely low in the state of so that signal light is completely converted to output light, the two three wave mixing processes are in crystal
In be all simultaneous.
The above embodiment of the present invention is not limiting the scope of the present invention, and embodiments of the present invention are not limited to
This, all this kind the above according to the present invention is not departing from this according to the ordinary technical knowledge and customary means of this field
Under the premise of inventing above-mentioned basic fundamental thought, modification, replacement or change to other diversified forms that above structure of the present invention is made
More, it should all fall within the scope and spirit of the invention.
Claims (6)
1. it is a kind of realize in infrared band laser light source secondary cascade efficient frequency conversion Non-linear coupling method, feature
It is, this method comprises the following steps：
(1) selection of transfer process coupling matrix；
(2) phase misalignment harmonic quantity and Stark shift parameter definition；
(3) cascade wavelength-conversion process stiffness of coupling modulation；
(4) selection of laser light source and nonlinear crystal；
(5) realize signal light to the wavelength converting process of middle infrared band.
2. the secondary cascade efficient frequency conversion of infrared band laser light source is non-linear in realization according to claim 1
Coupling process, which is characterized in that the detailed process of the step (1) is as follows：
It is as follows according to the Hamiltonian matrix of Stark chirp Adiabatic Fast Passage theory
Wherein, H (t) indicates that atom-is concerned with field system with the Hamiltonian of temporal evolution, and the t expression evolution times, i is imaginary number
And i2=-1,For Planck's constant, Ωp(t) Rabi frequency of pump field, Ω are indicateds(t) Lapie's frequency of Stokes field is indicated
Rate, S2(t) Stark shift of intermediate level, Δ are represented2Represent the photon mismatching angle of intermediate level, Δ3Represent the total light of energy level
Sub- mismatching angle, Γ indicate that rate is lost in spontaneous radiation,
By on Stark chirp Adiabatic Fast Passage theoretical origin to optics cascade wavelength convert field, matrix is redefined,
It is as follows
Wherein, H (t) indicates that atom-is concerned with field system with the Hamiltonian of temporal evolution, z representation space evolution length, and i is
Imaginary number and i2=-1,For Planck's constant, κ12(z) it is the secondary stiffness of coupling for cascading first process in wavelength convert, κ21
(z) it is its complex conjugate, Δ k1For the phase misalignment dosage of this process, κ23(z) it is secondary second mistake cascaded in wavelength convert
The stiffness of coupling of journey, κ32(z) it is its complex conjugate, Δ k2For the phase misalignment dosage of this process, κ123(z) it is secondary cascade wavelength
Total stiffness of coupling in transfer process, Δ k3For total phase misalignment dosage,
This matrix is selected, the coupling matrix as cascade wavelength convert.
3. the secondary cascade efficient frequency conversion of infrared band laser light source is non-linear in realization according to claim 1
Coupling process, which is characterized in that the detailed process of the step (2) is as follows：
Indicate that optics cascades the phase misalignment of transfer process with the photon mismatching angle in Stark chirp Adiabatic Fast Passage come analogy
Dosage, Δ2The phase misalignment dosage for indicating second process in secondary cascade wavelength-conversion process, with Δ k2Instead of Δ3It indicates
Total phase misalignment dosage in secondary cascade wavelength-conversion process, with Δ k3Instead of,
Stark shift amount S2(t) it is used for indicating total stiffness of coupling in secondary cascade wavelength-conversion process, two processes of modulation
Coupled relation, the spontaneous radiation that Γ is brought lose the influence to converting system, ignore.
4. the secondary cascade efficient frequency conversion of infrared band laser light source is non-linear in realization according to claim 1
Coupling process, which is characterized in that the detailed process of the step (3) is as follows：
Stiffness of coupling in transfer process uses three Gaussian pulse functional forms for having relative delay, as follows
Wherein, κ12Indicate the stiffness of coupling peak value of first three wave mixing process in secondary cascade change, κ23Indicate secondary cascade
The stiffness of coupling peak value of second three wave mixing process, κ in conversion123Indicate the stiffness of coupling of two three wave mixing processes of adjusting
Peak value, s1Indicate the coupled delay amount during first three wave mixing, w1Indicate the span of its coupling function, s2Indicate second
Coupled delay amount during a three wave mixing, w2Indicate the span of its coupling function, w3For the total stiffness of coupling κ of coupling function123
(z) span, wherein κ123> κ12,κ23, and define κ123=(κ12κ21+κ23κ32)1/2,
Wherein, Ap1Represent the complex amplitude of the first beam pump light, wp1For its frequency, Ap2Represent the complex amplitude of the second beam pump light, wp2
For its frequency, χ(2)For the second order susceptibility of crystalline material, w1For the frequency of signal light, w2For the frequency of intermediate light, w3For output
The frequency of light, kiAnd kjFor frequency wiAnd wjWave number, κijFor the stiffness of coupling peak value of transfer process, κ* jiFor its complex conjugate, (i,
J=1,2,3).
5. the secondary cascade efficient frequency conversion of infrared band laser light source is non-linear in realization according to claim 1
Coupling process, which is characterized in that the detailed process of the step (4) is as follows：
Due to the adiabatic condition requirement of Stark chirp Adiabatic Fast Passage, the adiabatic wavelength convert of optically secondary cascade is opposite
It answers, it is desirable that stiffness of coupling is sufficiently large, is reflected on laser pumping light source that seek to power sufficiently large, to ensure that adiabatic transmission is stablized
It carries out, so,
The selection picosecond of pump light source 1 or femtosecond pulsed light source, light intensity are GW grades,
The selection picosecond of pump light source 2 or femtosecond pulsed light source, light intensity are GW grades,
It is MW grades that signal optical source 3, which selects nanosecond or femtosecond pulsed light source, light intensity,
Nonlinear crystal select mix magnesia and length in 4cm hereinafter, the high lithium columbate crystal of threshold for resisting laser damage, passes through electricity
Aperiodic or no periodic structure is realized in field polarization.
6. the secondary cascade efficient frequency conversion of infrared band laser light source is non-linear in realization according to claim 1
Coupling process, which is characterized in that the detailed process of the step (5) is as follows：
The pump light and a branch of signal light of two beam different wave lengths while the lithium columbate crystal of vertical incidence periodic modulation, the first beam pump
Pu light and signal light pass through stiffness of coupling κ in crystal12Occur a three wave mixing process, the intermediate light of generation is immediately with second
Beam pump light passes through stiffness of coupling κ23Second of three wave mixing process occurs, generates final output light, among these, stiffness of coupling
κ123Two three wave mixing processes are adjusted, so that signal light is completely converted in the state that the intermediate light intensity of generation keeps extremely low
Output light, the two three wave mixing processes are all simultaneous in crystal.
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| CN111120236A (en) * | 2019-12-18 | 2020-05-08 | 上海大学 | Quantum thermal insulation shortcut heat engine with coupling harmonic oscillator as working medium and design method of thermal insulation shortcut process of quantum thermal insulation shortcut heat engine |
| CN111224308A (en) * | 2018-11-23 | 2020-06-02 | 中国科学院理化技术研究所 | Intermediate infrared optical parameter all-solid-state laser source |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111224308A (en) * | 2018-11-23 | 2020-06-02 | 中国科学院理化技术研究所 | Intermediate infrared optical parameter all-solid-state laser source |
| CN111120236A (en) * | 2019-12-18 | 2020-05-08 | 上海大学 | Quantum thermal insulation shortcut heat engine with coupling harmonic oscillator as working medium and design method of thermal insulation shortcut process of quantum thermal insulation shortcut heat engine |
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