CN110262155B - A kind of echo wall-shaped chamber position matches system and method - Google Patents

A kind of echo wall-shaped chamber position matches system and method Download PDF

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Publication number
CN110262155B
CN110262155B CN201910741877.9A CN201910741877A CN110262155B CN 110262155 B CN110262155 B CN 110262155B CN 201910741877 A CN201910741877 A CN 201910741877A CN 110262155 B CN110262155 B CN 110262155B
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echo wall
shaped chamber
reciprocal lattice
lattice vector
light
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CN110262155A (en
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尹志军
吴冰
许志城
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Nanjing Nanzhi Advanced Photoelectric Integrated Technology Research Institute Co Ltd
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Nanjing Nanzhi Advanced Photoelectric Integrated Technology Research Institute Co Ltd
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Priority to DE112019005640.9T priority patent/DE112019005640T5/en
Priority to PCT/CN2019/112805 priority patent/WO2021027062A1/en
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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
    • G02F1/3548—Quasi phase matching [QPM], e.g. using a periodic domain inverted structure
    • 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

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

The application provides a kind of echo wall-shaped chamber position and matches system and method, utilize the periodicity of Echo Wall microcavity itself, the periodical poling of Echo Wall microcavity is divided into two semicircles, the contrary Echo Wall cavity structure verifying of periodical poling calculates resulting reciprocal lattice vector intensity and quantity, to determine the maximum nonlinear factor of material.Echo wall-shaped chamber position is provided by the application to match system, can obtain maximum nonlinear factor, and nonlinear factor loses caused by avoiding because of domain structure, while obtaining unique reciprocal lattice vector, keeps output wavelength unique, eliminates the stray light of other reciprocal lattice vectors generation.So that oscillator does not need manufacturing cycle structure in polarization process, reduce the complexity of polarization process.

Description

A kind of echo wall-shaped chamber position matches system and method
Technical field
Match system and side this application involves optical parametric oscillator technical field more particularly to a kind of echo wall-shaped chamber position Method.
Background technique
Optical parametric oscillator (Optical Parametric Oscillator, OPO) is an oscillation in optical frequency Parametric oscillator.It interacts the pump light of input by second nonlinear optic, and it is lower to be converted into two frequencies Output light, i.e. signal light and ideler frequency light.The mode volume of Echo Wall optical microcavity is small, and quality factor is high, can greatly enhance light with The interaction of substance；And Echo Wall optical microcavity integration is good, is considered having great answer in integrated optical device field Use prospect.
Echo wall-shaped chamber is usually to be prepared by the high material of refractive index, if poly dimethyl Gui oxygen is burnt, glass etc., it Light beam is tied to intracavitary by the main total internal reflection for utilizing light constantly to occur on microcavity inner boundary.When light is intracavitary along echo wall-shaped Surface is propagated after a week, if wavelength meets interference, phase elongate member will form stable traveling wave mode in microcavity, most It is realized eventually to the strong imprison of one kind of light field.The echo wall-shaped chamber made of nonlinear crystals such as lithium niobates has second order non-linear Property effect, non-linear gain can be generated in the case where pumping light action, to form optical parametric oscillator.
But above-mentioned optical parametric oscillator must carry out position and match, to compensate the position phase mismatch generated in transmission process. Traditional position method that matches mainly has that birefringent position matches method and level matches method.It is double in echo wall-shaped chamber The refraction position method of matching is not appropriate for, because such matching way can bring space to go away, influences the angle for vibrating optical transport, Destroy Echo Wall transmission mode.
The level generallyd use the mode that matches is that have rhythmic farmland along the optical transmission direction polarization of echo wall-shaped chamber and tie Structure provides the wave vector between emptying by period domain structure, compensates position phase mismatch.The domain structure modulation to be matched due to level it is non- Linear coefficient is only ± 1, and the wave vector between emptying not only only one, but infinite number of sequence, and highest reciprocal lattice vector Intensity can also decline.Multiple reciprocal lattice vectors can generate the oscillation of multiple wavelength, influence the degree of purity of output spectrum, reciprocal lattice vector intensity Decline can also reduce the intensity of non-linear conversion, reduce the delivery efficiency of Echo Wall optical parametric oscillator.
Summary of the invention
Match system and method this application provides a kind of echo wall-shaped chamber position, lattice can not be made down to solve legacy system Arrow intensity reaches maximum, while reciprocal lattice vector does not have the problem of uniqueness.
On the one hand, the application provides a kind of echo wall-shaped chamber position and matches system, comprising:
Echo wall-shaped chamber is disc-shaped structure, including two and half cylindrical cavities, and the polarization direction of two and half cylindrical cavities is on the contrary, with logical Nonlinear interaction is crossed by pump light excitation signal light and ideler frequency light, signal light and ideler frequency light resonance, Yi Jitong in Echo Wall chamber Non-linear enhancing is crossed, optical parametric oscillation is formed；
The side of the echo wall-shaped chamber is arranged in prism, to carry out coupling input to described time to the pump light of input Sound wall-shaped chamber；
Data processing equipment, for calculating corresponding reciprocal lattice vector according to pump wavelength and Echo Wall impression material parameter, Include:
According to level match principle generate effective nonlinear coefficient variation function；
Fourier transformation is carried out to effective nonlinear coefficient variation function；
Reciprocal lattice vector intensity is calculated according to Fourier transformation result, and determines the maximum nonlinear factor of material.
Optionally, the data processing equipment is also used to, and according to the calculated result of reciprocal lattice vector intensity, adjusts echo wall-shaped chamber The polarization direction of two semicircles, and incident pumping light polarization direction.
Optionally, according to level match principle generate effective nonlinear coefficient variation function the step of after, the data Processing unit is also used to:
The radius of echo wall-shaped chamber is obtained, polarization cycle is generated；
Change function according to effective nonlinear coefficient, generates the relational graph of effective nonlinear coefficient and period.
Optionally, the lower section of the echo wall-shaped chamber, which has, is equipped with the support that diameter is less than the echo wall-shaped chamber diameter Block, the supporting block is for being isolated the echo wall-shaped chamber with substrate.
Optionally, the prism is prism, enter back pump light by prism-coupled by the refraction of prism Sound wall-shaped chamber, the side wall along the echo wall-shaped chamber are propagated.
On the other hand, the application also provides a kind of echo wall-shaped chamber position and matches method, comprising:
Set echo wall-shaped chamber host material and pump wavelength；
According to host material type, echo wall-shaped chamber is built, and in Echo Wall cavity side face setting prism to carry out light Coupling input output；
According to level match principle calculate signal light and ideler frequency light wavelength, generate effective nonlinear coefficient change letter Number；
Fourier transformation is carried out to effective nonlinear coefficient variation function；
Reciprocal lattice vector intensity is calculated according to Fourier transformation result, and determines the maximum nonlinear factor of material；
The maximum nonlinear factor is verified by the echo wall-shaped chamber built.
Optionally, according to level match principle calculate signal light and ideler frequency light wavelength, generate effective nonlinear system In the step of number variation function, the wavelength of pump light, signal light and ideler frequency light meets following relationship:
In formula, λpFor pump wavelength；λsFor signal light wavelength；λiFor ideler frequency optical wavelength；
np、nsAnd niRefractive index of the respectively described Echo Wall impression material to pump light, signal light and ideler frequency light；
Λ is echo wall-shaped chamber polarization equivalent period.
Optionally, after the step of calculating reciprocal lattice vector intensity according to Fourier transformation result, further includes:
According to Fourier transformation as a result, determining the relation function between reciprocal lattice vector intensity and reciprocal lattice vector position；
According to the relation function, it is determined whether there are reciprocal lattice vector maximum of intensity and reciprocal lattice vector quantitative values；
If the reciprocal lattice vector quantity is limited multiple, and there are reciprocal lattice vector maximum of intensity, determines that the maximum of material is non- Linear coefficient.
Optionally, after the step of calculating reciprocal lattice vector intensity according to Fourier transformation result, further includes:
If the reciprocal lattice vector quantitative value is unlimited number of, and reciprocal lattice vector maximum of intensity is not present, echo wall-shaped is adjusted The polarization direction of two semicircles of chamber, and incident pumping light polarization direction；
Reciprocal lattice vector intensity is recalculated, and determines the maximum nonlinear factor of material according to the result recalculated.
Optionally, according to level match principle calculate signal light and ideler frequency light wavelength, generate effective nonlinear coefficient The step of changing function, comprising:
Obtain modulation function；
According to the modulation function, effective nonlinear coefficient is generated with the variation function of transmission process；
The radius of echo wall-shaped chamber is obtained, polarization cycle is generated；
According to the variation function of effective nonlinear coefficient, the relational graph of effective nonlinear coefficient and period is generated.
From the above technical scheme, the application provides a kind of echo wall-shaped chamber position and matches system and method, using returning The periodical poling of Echo Wall microcavity is divided into two semicircles, the contrary Echo Wall of periodical poling by the periodicity of sound wall microcavity itself Cavity structure verifying calculates resulting reciprocal lattice vector intensity and quantity, to determine the maximum nonlinear factor of material.Pass through the application It provides echo wall-shaped chamber position to match system, maximum nonlinear factor can be obtained, nonlinear system caused by avoiding because of domain structure Number loss, while unique reciprocal lattice vector is obtained, keep output wavelength unique, eliminates the stray light of other reciprocal lattice vectors generation.So that vibration It swings device and does not need manufacturing cycle structure in polarization process, reduce the complexity of polarization process.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below Singly introduce, it should be apparent that, for those of ordinary skills, without creative efforts, also Other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 is that a kind of echo wall-shaped chamber position of the application matches system structure diagram；
Fig. 2 is that a kind of echo wall-shaped chamber position of the application matches system pipeline schematic diagram；
Fig. 3 is the application rectangular Periodic nonlinear factor variation relation schematic diagram；
Fig. 4 is that the application another kind echo wall-shaped chamber position matches system structure diagram；
Fig. 5 is that the application another kind echo wall-shaped chamber position matches system pipeline schematic diagram；
Fig. 6 is the perspective view of the application nonlinear polarization tensor in polarization direction；
Fig. 7 is the application longitudinal cosine type periodicity nonlinear factor variation relation schematic diagram.
Specific embodiment
Embodiment will be illustrated in detail below, the example is illustrated in the accompanying drawings.In the following description when referring to the accompanying drawings, Unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Implement described in following embodiment Mode does not represent all embodiments consistent with the application.It is only and be described in detail in claims, the application The example of the consistent system and method for some aspects.
In technical solution provided by the present application, the reciprocal lattice vector, i.e. reciprocal lattice vector are a kind of solid state physics profession arts Language, for describing the crystal lattice momentum of phonon-electron.It is vertical with the crystal face of positive grid space to be normally defined reciprocal lattice vector, and length etc. In reciprocal 2 π times of interplanar distance；Alternatively, reciprocal lattice vector is vertical with the crystal face of positive grid space, and length is equal to falling for interplanar distance Number.For the application due to only determining size, above two definition is that specific value is different, can be used as the application and falls lattice The Strength co-mputation foundation of arrow.
The echo wall-shaped chamber, i.e. Echo Wall optical parametric oscillator are that one kind can make light shake along Echo Wall side wall annular The optical parametric device swung is generally matched mode using level, in order to realize that position matches by the ferroelectric domain of crystal according to the period Reversion, the stroke reciprocal lattice vector between emptying match the position phase of mismatch.The domain structure of this periodic inversion provides multiple reciprocal lattice vectors, Matched highest reciprocal lattice vector is not up to maximum nonlinear factor, and the optical parameter vibration except the design easy to form of spuious reciprocal lattice vector Wavelength is swung, the purity of optical parametric oscillator spectrum is influenced.In order to solve this problem, the application passes through a kind of special periodical poling Structure, i.e., using the form on positive and negative two semicircle farmlands of polarizing in echo wall-shaped optical parametric oscillator, so that matched reciprocal lattice vector Reach maximum, and without spuious reciprocal lattice vector.
Referring to Fig. 1, match the structural schematic diagram of system for a kind of echo wall-shaped chamber position of the application.
Referring to fig. 2, match system pipeline schematic diagram for a kind of echo wall-shaped chamber position of the application.
As seen from Figure 1, Figure 2, a kind of echo wall-shaped chamber position provided by the present application matches system, comprising: echo wall-shaped chamber, Prism and data processing equipment.
Wherein, echo wall-shaped chamber, is disc-shaped structure, including two and half cylindrical cavities, the polarization directions of two and half cylindrical cavities on the contrary, With by nonlinear interaction by pump light excitation signal light and ideler frequency light, signal light and the ideler frequency light resonance in Echo Wall chamber, with And by non-linear enhancing, form optical parametric oscillation.The side of the echo wall-shaped chamber is arranged in, with the pump to input in prism Pu light carries out coupling input to the echo wall-shaped chamber.In technical solution provided by the present application, constituted back using ferroelectric crystal Sound wall microcavity, to microcavity carry out it is positive and negative it is semicircle polarize, form two semicircle farmlands, by control the radius of Echo Wall microcavity into The position of row specific wavelength matches.
Further, in order to preferably realize that optical parametric oscillation acts on, in the section Example of the application, the echo The lower section of wall-shaped chamber, which has, is equipped with the supporting block that diameter is less than the echo wall-shaped chamber diameter, and the supporting block is for making described return Sound wall-shaped chamber is isolated with substrate.By supporting block, echo wall-shaped chamber can be supported, on the one hand be adapted to pumping laser Incoming position, so that echo wall-shaped chamber is entered most suitable pumping laser；On the other hand it can also meet multiple pumpings The incident angle requirement of laser, flexibly to carry out the adjustment of incident pump laser.
The prism can be prism, to make pump light enter the Echo Wall by prism-coupled by the refraction of prism Type chamber, the side wall along the echo wall-shaped chamber are propagated.It, can be by pump light with specified by the refraction action in each face of prism Direction be incident in echo wall-shaped chamber, can also be by adjusting prism and when needing to carry out incidence adjustment Placed angle makes the light direction of refraction change.In addition, component environment can also be avoided by the refraction action of prism Light is also incident in echo wall-shaped chamber, reduces external interference situation.
Data processing equipment, for calculating corresponding reciprocal lattice vector according to pump wavelength and Echo Wall impression material parameter, Specifically comprise the following steps:
According to level match principle generate effective nonlinear coefficient variation function；
Fourier transformation is carried out to effective nonlinear coefficient variation function；
Reciprocal lattice vector intensity is calculated according to Fourier transformation result, and determines the maximum nonlinear factor of material.
It should be noted that data processing equipment described herein is only a kind of dress that can be realized computing function It sets, for example, computer, server, terminal device etc..It, can also be according in order to realize above-mentioned data handling procedure in practical application Hold in the palm in the application software of any data processing or other can obtain the equipment or mode of calculated result.Ability The technical staff in domain no matter using hardware device progress data processing and analysis, or is led on the basis of above-mentioned treatment process Cross artificial calculating, the mode of software analysis belongs to the protection model of the application as long as its data handling procedure meets above-mentioned steps It encloses.
For ease of description, the application establishes rectangular coordinate system in space, and the x's, y-axis composition in rectangular coordinate system in space is flat Face is parallel to the corresponding plane of echo wall-shaped chamber disc-shape, and z-axis is perpendicular to the corresponding plane of echo wall-shaped chamber disc-shape.Show Example ground, as shown in Fig. 2, in the present embodiment, Echo Wall microcavity is divided into two semicircles, half polarization direction edge+Z axis, a half-shadow Change direction edge-Z axis, correspondingly, the pumping light polarization direction edge+Z axis or-Z axis of prism-coupled.
Wavelength is λpPump light, after entering Echo Wall microcavity by prism-coupled, the signal light and ideler frequency light wave of excitation Long is respectively λsAnd λi.Echo Wall microcavity material is respectively n to the refractive index of three wavelengthp、nsAnd ni.Signal light and ideler frequency light edge Echo Wall side wall is propagated, and by returning to origin after a week, therefore, the echo wall-shaped chamber polarization mode has the equivalent period Λ。
Matched principle according to level, when three wavelength meet following relationship, position is mutually compensated:
In formula, λpFor pump wavelength；λsFor signal light wavelength；λiFor ideler frequency optical wavelength；
np、nsAnd niRefractive index of the respectively described Echo Wall impression material to pump light, signal light and ideler frequency light；
Λ is echo wall-shaped chamber polarization equivalent period, since echo wall-shaped chamber is disc, equivalent period 2 π r, r are the radius of disc echo wall-shaped chamber.In technical solution provided by the present application, the refractive index of signal light and ideler frequency light and The sum of ratio of wavelength, in addition the inverse of polarization cycle, equal to the refractive index of pump light and the ratio of wavelength, when meeting above-mentioned pass Position is carried out when being to match, and is ascended the throne and is mutually compensated.
The effective nonlinear coefficient of material is denoted as, then with the variation letter of the effective nonlinear coefficient of transmission process Number is。With non-linear tensor elementsRelationship it is writeable are as follows:
Wherein, variation function refers to the relationship of non-linear tensor elements and effective nonlinear coefficient, and functional relation represents A kind of variation relation, that is, cashing is rectangular function:
I.e. practical to calculate, if the absolute value of x is greater than 1/2, rect(x) value be equal to 0；If the absolute value of x is less than 1/2, rect(x) value is equal to 1.Further, according to effective nonlinear coefficient change function, generate effective nonlinear coefficient with The relational graph in period, that is, above formula and transmission range are mapped, rectangular Periodic nonlinear factor as shown in Figure 3 is can get and becomes Change, the period, wherein r is the radius of Echo Wall microcavity.
By symbolIt is calculated as Fourier transformation symbol, then the reciprocal lattice vector intensity between emptying can be obtained by Fourier transformation:
K in above formula is the position of reciprocal lattice vector, andIt is the intensity of reciprocal lattice vector.
According to discrete reciprocal lattice vector position:, wherein N=1,2,3 ..., then it is available discrete at these The reciprocal lattice vector intensity of position are as follows:
Such as:
As it can be seen that upper rheme matches, mode can provide reciprocal lattice vector, but reciprocal lattice vector has unlimited number of, and highest is fallen Lattice vector intensity is, not up to maximum value.
Further, the data processing equipment is also used to, and according to the calculated result of reciprocal lattice vector intensity, adjusts echo wall-shaped The polarization direction of two semicircles of chamber, and incident pumping light polarization direction.
Illustratively, as shown in figure 4, the polarization direction of two semicircles of Echo Wall microcavity is along Y-axis, respectively +Y direction and-Y Direction, incident pumping light polarization direction are vertical with the direction of propagation of pump light in the plane that X, Y-axis form.Therefore, pass through The pumping light polarization direction that prism-coupled enters Echo Wall microcavity is rotated along the side wall of Echo Wall microcavity, as shown in fig. 6, same swash The signal light of hair and the polarization direction of ideler frequency light are also rotated along the side wall of Echo Wall microcavity.
Correspondingly, effective nonlinear coefficient is the nonlinear polarization tensor d of crystal33Projection in polarization direction, such as Fig. 6 It is shown, it is calculated as:
And according to angleWith the relationship of transmission range:, determine modulation functionWith following form:
Similarly, above formula and transmission range are mapped, can get longitudinal cosine type periodicity nonlinear factor as shown in Figure 7 and becomes Change.
Fourier transformation is done into the modulation of such effective nonlinear coefficient, the corresponding reciprocal lattice vector between emptying can be obtained are as follows:
It is analyzed from above formula, only reciprocal lattice vector position are as follows:
At this point, the intensity of reciprocal lattice vector are as follows:
Therefore, this position matches, and there are two reciprocal lattice vectors for only tool, and reciprocal lattice vector intensity can reach highest.In addition, in reality During border position matches, due to the limitation of material property, k=- 1/r reciprocal lattice vector is difficult to occur, therefore available unique Reciprocal lattice vector is matched, can be obtained pure output spectrum.In this application, reciprocal lattice vector intensity is calculated according to Fourier transformation result Afterwards, the maximum nonlinear factor of material can also be further determined that.
Based on above system, the application also provides a kind of echo wall-shaped chamber position and matches method, comprising the following steps:
S1: setting echo wall-shaped chamber host material and pump wavelength；
S2: according to host material type, echo wall-shaped chamber is built, and in Echo Wall cavity side face setting prism to carry out The coupling input of light exports；
S3: according to level match principle calculate signal light and ideler frequency light wavelength, generate effective nonlinear coefficient variation Function；
S4: Fourier transformation is carried out to effective nonlinear coefficient variation function；
S5: reciprocal lattice vector intensity is calculated according to Fourier transformation result, and determines the maximum nonlinear factor of material；
S6: the maximum nonlinear factor is verified by the echo wall-shaped chamber built.
By above step it is found that technical solution provided by the present application can be first according to the echo wall-shaped chamber matrix material of premeasuring Material matches the Echo Wall cavity structure in system according to the echo wall-shaped chamber position, builds echo wall-shaped chamber.And according to reality Border pump light form sets pump wavelength.Matched principle according to level, it can be according to pump wavelength and current matrix material The reflectivity of material determines the wavelength of signal light and ideler frequency light, and combines modulation function, can determine that effective nonlinear coefficient becomes Change function.
Further, according to level match principle calculate signal light and ideler frequency light wavelength, generate effective nonlinear system It is the step of number variation function, further comprising the steps of:
S301: modulation function is obtained；
S302: according to the modulation function, effective nonlinear coefficient is generated with the variation function of transmission process；
S303: obtaining the radius of echo wall-shaped chamber, generates polarization cycle；
S304: according to the variation function of effective nonlinear coefficient, the relational graph of effective nonlinear coefficient and period is generated.
In the present embodiment, effective nonlinear coefficient and period can be generated according to the variation function of effective nonlinear coefficient Relational graph.According to the relational graph of generation, the judgement for carrying out reciprocal lattice vector intensity and position can be assisted, so as to true in subsequent step Fixed maximum nonlinear factor.
After generating effective nonlinear coefficient variation function, function (resonance effect) can be obtained by Fourier transformation Amplitude-frequency characteristic, for judging reciprocal lattice vector intensity and quantity.
In the section Example of the application, after the step of Fourier transformation result calculating reciprocal lattice vector intensity, also wrap It includes:
S401: according to Fourier transformation as a result, determining the relation function between reciprocal lattice vector intensity and reciprocal lattice vector position；
S402: according to the relation function, it is determined whether there are reciprocal lattice vector maximum of intensity and reciprocal lattice vector quantitative values；
S403: if the reciprocal lattice vector quantity is limited multiple, and there are reciprocal lattice vector maximum of intensity, determine material most Big nonlinear factor.
In practical application, since different host materials possesses different optical parametric oscillation characteristics, once calculating In, it is more likely that the case where appearance can not determine reciprocal lattice vector intensity and quantity, i.e., the calculating reciprocal lattice vector determined according to relation function Quantity be it is unlimited number of, in this case often be not present reciprocal lattice vector intensity maximum value.In this case, it needs to adjust again Whole echo wall-shaped chamber, makes the polarization direction of two semicircles change, and adjusts incident pumping light polarization direction, again into Row calculates.I.e. in the section Example of the application, after the step of Fourier transformation result calculating reciprocal lattice vector intensity, also wrap It includes:
S404: if the reciprocal lattice vector quantitative value is unlimited number of, and reciprocal lattice vector maximum of intensity is not present, adjusts echo The polarization direction of two semicircles of wall-shaped chamber, and incident pumping light polarization direction；
S405: recalculating reciprocal lattice vector intensity, and the maximum nonlinear system of material is determined according to the result recalculated Number.
For using use niobic acid lithium material as the host material of Echo Wall microcavity, if the Zhou Changwei 30 of Echo Wall microcavity μm, radius is 4.78 μm, with a thickness of 10 μm.Match mode according to upper rheme, by the electricdomain polarization direction of Echo Wall microcavity Reversely, two opposite semicircles of polarization direction are formed.
Pump wavelength is 1.064 μm, and polarization direction is in disk institute planar and perpendicular to optical propagation direction.Pumping Light is coupled into Echo Wall microcavity by rutile high index prism and transmits along the Echo Wall, the polarization direction in transmission process In disk, institute is planar and vertical with the direction of propagation.
Matched equation according to position:
And by the refractive index of three wavelength、、With Echo Wall radius r=4.78 μm It brings above formula into, matched signal light is calculated and ideler frequency optical wavelength isµm、 µm.According to above Analysis, such matched effective nonlinear coefficient of mode, reach the maximum non-linear of material Coefficient.
It should be noted that above-described embodiment is as just a kind of example, it, can according to actual application environment in practical application Voluntarily to adjust various input datas, and host material type, structure size used by echo wall-shaped chamber etc. is built in adjustment Parameter, it is only necessary to which the parameter of adaptive change is passed through into above-mentioned calculating process again.
From the above technical scheme, echo wall-shaped chamber position provided by the present application matches system, utilizes Echo Wall microcavity The periodical poling of Echo Wall microcavity is divided into two semicircles by the periodicity of itself, and periodical poling is contrary.It is provided back by the application Sound wall-shaped chamber position matches system, can obtain maximum nonlinear factor, and nonlinear factor loses caused by avoiding because of domain structure, Unique reciprocal lattice vector is obtained simultaneously, keeps output wavelength unique, eliminates the stray light of other reciprocal lattice vectors generation.So that oscillator is in pole Manufacturing cycle structure is not needed during changing, reduces the complexity of polarization process.
Similar portion cross-reference between embodiment provided by the present application, specific embodiment provided above is only It is several examples under the total design of the application, does not constitute the restriction of the application protection scope.For those skilled in the art For member, any other embodiment expanded without creative efforts according to application scheme all belongs to In the protection scope of the application.

Claims (10)

  1. The system 1. a kind of echo wall-shaped chamber position matches characterized by comprising
    Echo wall-shaped chamber is disc-shaped structure, including two and half cylindrical cavities, and the polarization direction of two and half cylindrical cavities is on the contrary, with by non- Linear action is by pump light excitation signal light and ideler frequency light, signal light and the ideler frequency light resonance in Echo Wall chamber, and passes through non- Linear enhancing, forms optical parametric oscillation；
    The side of the echo wall-shaped chamber is arranged in prism, to carry out coupling input to the Echo Wall to the pump light of input Type chamber；
    Data processing equipment is wrapped for calculating corresponding reciprocal lattice vector according to pump wavelength and Echo Wall impression material parameter It includes:
    According to level match principle generate effective nonlinear coefficient variation function；
    Fourier transformation is carried out to effective nonlinear coefficient variation function；
    Reciprocal lattice vector intensity is calculated according to Fourier transformation result, and determines the maximum nonlinear factor of material.
  2. The system 2. echo wall-shaped chamber position according to claim 1 matches, which is characterized in that the data processing equipment is also For adjusting the polarization direction of two semicircles of echo wall-shaped chamber, and incident pumping according to the calculated result of reciprocal lattice vector intensity Light polarization direction.
  3. The system 3. echo wall-shaped chamber position according to claim 1 matches, which is characterized in that matched principle according to level After the step of generating effective nonlinear coefficient variation function, the data processing equipment is also used to:
    The radius of echo wall-shaped chamber is obtained, polarization cycle is generated；
    Change function according to effective nonlinear coefficient, generates the relational graph of effective nonlinear coefficient and period.
  4. The system 4. echo wall-shaped chamber position according to claim 1 matches, which is characterized in that under the echo wall-shaped chamber Side is equipped with the supporting block that diameter is less than the echo wall-shaped chamber diameter, and the supporting block is for making the echo wall-shaped chamber and substrate Isolation.
  5. The system 5. echo wall-shaped chamber position according to claim 1 matches, which is characterized in that the prism is prism, Pump light is set to enter echo wall-shaped chamber by prism-coupled with the refraction by prism, the side wall along the echo wall-shaped chamber passes It broadcasts.
  6. A kind of method 6. echo wall-shaped chamber position matches characterized by comprising
    Set echo wall-shaped chamber host material and pump wavelength；
    According to host material type, echo wall-shaped chamber is built, and prism is set to carry out the coupling of light in Echo Wall cavity side face Close input and output；
    According to level match principle calculate signal light and ideler frequency light wavelength, generate effective nonlinear coefficient change function；
    Fourier transformation is carried out to effective nonlinear coefficient variation function；
    Reciprocal lattice vector intensity is calculated according to Fourier transformation result, and determines the maximum nonlinear factor of material；
    The maximum nonlinear factor is verified by the echo wall-shaped chamber built.
  7. The method 7. echo wall-shaped chamber position according to claim 6 matches, which is characterized in that match original according to level Reason calculate signal light and ideler frequency light wavelength, generate effective nonlinear coefficient variation function the step of in, pump light, signal light and The wavelength of ideler frequency light meets following relationship:
    In formula, λpFor pump wavelength；λsFor signal light wavelength；λiFor ideler frequency optical wavelength；R is the radius of echo wall-shaped chamber；
    np、nsAnd niRefractive index of the respectively described Echo Wall impression material to pump light, signal light and ideler frequency light；
    Λ is echo wall-shaped chamber polarization equivalent period.
  8. The method 8. echo wall-shaped chamber position according to claim 6 matches, which is characterized in that according to Fourier transformation result After the step of calculating reciprocal lattice vector intensity, further includes:
    According to Fourier transformation as a result, determining the relation function between reciprocal lattice vector intensity and reciprocal lattice vector position；
    According to the relation function, it is determined whether there are reciprocal lattice vector maximum of intensity and reciprocal lattice vector quantitative values；
    If the reciprocal lattice vector quantity is limited multiple, and there are reciprocal lattice vector maximum of intensity, determines that the maximum of material is non-linear Coefficient.
  9. The method 9. echo wall-shaped chamber position according to claim 8 matches, which is characterized in that according to Fourier transformation result After the step of calculating reciprocal lattice vector intensity, further includes:
    If the reciprocal lattice vector quantitative value is unlimited number of, and reciprocal lattice vector maximum of intensity is not present, echo wall-shaped chamber two is adjusted The polarization direction of a semicircle, and incident pumping light polarization direction；
    Reciprocal lattice vector intensity is recalculated, and determines the maximum nonlinear factor of material according to the result recalculated.
  10. The method 10. echo wall-shaped chamber position according to claim 6 matches, which is characterized in that matched original according to level The step of reason calculates the wavelength of signal light and ideler frequency light, generates effective nonlinear coefficient variation function, comprising:
    Obtain modulation function；
    According to the modulation function, effective nonlinear coefficient is generated with the variation function of transmission process；
    The radius of echo wall-shaped chamber is obtained, polarization cycle is generated；
    According to the variation function of effective nonlinear coefficient, the relational graph of effective nonlinear coefficient and period is generated.
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