CN109239948A - Non-paraxial autoacceleration frequency multiplication light beam regulation device and method - Google Patents
Non-paraxial autoacceleration frequency multiplication light beam regulation device and method Download PDFInfo
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- WSMQKESQZFQMFW-UHFFFAOYSA-N 5-methyl-pyrazole-3-carboxylic acid Chemical compound CC1=CC(C(O)=O)=NN1 WSMQKESQZFQMFW-UHFFFAOYSA-N 0.000 claims description 10
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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
- G02F1/01—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 for the control of the intensity, phase, polarisation or colour
- G02F1/03—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 for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
- G02F1/0327—Operation of the cell; Circuit arrangements
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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
- G02F1/01—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 for the control of the intensity, phase, polarisation or colour
- G02F1/0136—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 for the control of the intensity, phase, polarisation or colour for the control of polarisation, e.g. state of polarisation [SOP] control, polarisation scrambling, TE-TM mode conversion or separation
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Abstract
The invention discloses a kind of non-paraxial autoacceleration frequency multiplication light beam regulation device and methods, are applied to optical technical field.The device includes: electric field unit, is electrical connected with quasi-phase matched unit, gives quasi-phase matched unit for loading electric field, so as to generate linear electro-optic effect inside quasi-phase matched unit.Quasi-phase matched unit, it is additionally arranged at the front end of filter unit, for the basic frequency beam from light source to be converted to non-paraxial autoacceleration frequency multiplication light beam according to quasi-phase matched condition, and quasi-phase matched condition is adjusted using linear electro-optic effect, to regulate and control the polarization state and intensity of non-paraxial autoacceleration frequency multiplication light beam, and the non-paraxial autoacceleration frequency multiplication light beam after regulation is transmitted to filter unit.Filter unit, for filtering out the basic frequency beam across quasi-phase matched unit, the non-paraxial autoacceleration frequency multiplication light beam after being regulated from received light beam.The flexibility of light beam regulation can be improved in the device.
Description
Technical field
The present invention relates to optical technical field more particularly to a kind of non-paraxial autoacceleration frequency multiplication light beam regulation device and sides
Method.
Background technique
With fast development scientific and technical in recent years, autoacceleration light beam the features such as salt free ligands and autoacceleration to be applied to
Optical micromanipulation field.Wherein, the paraxial limitation that non-paraxial autoacceleration light beam can break through traditional autoacceleration light beam because of it, is being widened
Autoacceleration light beam is applied and the micromation of optical device aspect plays a significant role.Current non-paraxial autoacceleration light beam usually passes through
Change the mode of propagation medium to change polarization state and intensity, but this is a kind of passively control methods, to exist flexible
The inadequate problem of property.
Summary of the invention
The main purpose of the embodiment of the present invention is to provide a kind of non-paraxial autoacceleration frequency multiplication light beam regulation device and method,
The flexibility of light beam regulation can be improved.
First aspect of the embodiment of the present invention provides a kind of non-paraxial autoacceleration frequency multiplication light beam regulation device, described device packet
It includes: electric field unit, quasi-phase matched unit and filter unit；The electric field unit, with the quasi-phase matched unit electrical property phase
Even, for loading electric field to the quasi-phase matched unit, so as to generate linear electrooptic effect inside the quasi-phase matched unit
It answers；The quasi-phase matched unit, is additionally arranged at the front end of the filter unit, for that will be come from according to quasi-phase matched condition
The basic frequency beam of light source is converted to non-paraxial autoacceleration frequency multiplication light beam, and adjusts the quasi- phase using the linear electro-optic effect
Matching condition, to regulate and control the polarization state and intensity of the non-paraxial autoacceleration frequency multiplication light beam, and certainly by the non-paraxial after regulation
Frequency multiplication light beam is accelerated to be transmitted to the filter unit；The filter unit, for filtering out across the standard from received light beam
The basic frequency beam of phase matching components, the non-paraxial autoacceleration frequency multiplication light beam after obtaining the regulation.
Second aspect of the embodiment of the present invention provides a kind of non-paraxial autoacceleration frequency multiplication light beam regulation method, is applied to this reality
Apply non-paraxial autoacceleration frequency multiplication light beam regulation device described in a first aspect, which comprises the control quasi- phase
The basic frequency beam from light source is converted to by non-paraxial autoacceleration frequency multiplication light beam according to quasi-phase matched condition with unit；Control institute
Electric field unit load electric field is stated to the quasi-phase matched unit, so as to generate linear electrooptic inside the quasi-phase matched unit
Effect；It controls the quasi-phase matched unit and adjusts the quasi-phase matched condition using the linear electro-optic effect, with regulation
The polarization state and intensity of the non-paraxial autoacceleration frequency multiplication light beam, and by the non-paraxial autoacceleration frequency multiplication beam emissions after regulation
To the filter unit；The filter unit is controlled from received light beam, filters out the base across the quasi-phase matched unit
Frequency light beam, the non-paraxial autoacceleration frequency multiplication light beam after obtaining the regulation.
From above-described embodiment it is found that being changed into basic frequency beam according to quasi-phase matched condition by quasi-phase matched unit
Non-paraxial autoacceleration frequency multiplication light beam, and electric field is loaded by electric field unit and gives quasi-phase matched unit, adjust quasi-phase matched item
Part, thus regulate and control the polarization state and intensity of the non-paraxial autoacceleration frequency multiplication light beam of outgoing, rather than by changing propagation medium
Light beam is regulated and controled, the flexibility of light beam regulation is improved.
Detailed description of the invention
Fig. 1 is the structural representation of the non-paraxial autoacceleration frequency multiplication light beam regulation device in first embodiment provided by the invention
Figure；
Fig. 2 is the polarization pattern schematic diagram of the quasi-phase matched unit in first embodiment provided by the invention；
Fig. 3 is the surface of intensity distribution in first embodiment provided by the invention；
Fig. 4 is the implementation process of the non-paraxial autoacceleration frequency multiplication light beam regulation method in second embodiment provided by the invention
Schematic diagram.
Specific embodiment
In order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below in conjunction with the present invention
Attached drawing in embodiment, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described reality
Applying example is only a part of the embodiment of the present invention, and not all embodiments.Based on the embodiments of the present invention, those skilled in the art
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Referring to the non-paraxial autoacceleration frequency multiplication light beam regulation device that Fig. 1, Fig. 1 are in first embodiment provided by the invention
Structural schematic diagram.The device includes: electric field unit 101, quasi-phase matched unit 102 and filter unit 103.Electric field unit 101,
It is electrical connected with quasi-phase matched unit 102, for loading electric field to quasi-phase matched unit 102, so that quasi-phase matched list
102 inside of member generates linear electro-optic effect.Wherein, linear electro-optic effect refers to that loading electric field by electric field unit 101 causes
The phenomenon that refractive index of quasi-phase matched unit 102 changes.
Quasi-phase matched unit 102 is additionally arranged at the front end of filter unit 103, and being used for will according to quasi-phase matched condition
Basic frequency beam from light source is converted to non-paraxial autoacceleration frequency multiplication light beam, and adjusts quasi-phase matched using linear electro-optic effect
Condition, to regulate and control the polarization state and intensity of non-paraxial autoacceleration frequency multiplication light beam, and by the non-paraxial autoacceleration frequency multiplication after regulation
Beam emissions are to filter unit 103.
Specifically, the basic frequency beam from light source is Gaussian beam, frequency-doubled effect is realized in quasi-phase matched unit 102
The light wave of interaction must be enabled to meet quasi-phase matched condition when transmitting in quasi-phase matched unit 102.Wherein, quasi- phase
Working principle with condition is the non-linear susceptibility using periodic modulation quasi-phase matched unit 102, makes up non-linear mistake
Phase mismatch caused by journey, to improve the transfer efficiency of nonlinear optical frequency conversion.Basic frequency beam from light source, it is incident
Quasi-phase matched frequency-doubled effect occurs inside quasi-phase matched unit 102, basic frequency beam is converted for quasi-phase matched unit 102
For non-paraxial autoacceleration frequency multiplication light beam.
At the same time, the electric field that electric field unit 101 loads generates linear electrooptic effect inside quasi-phase matched unit 102
It answers, linear electro-optic effect causes the refractive index of quasi-phase matched unit 102 to change, and refringence influences quasi- phase
With condition, the phase mismatch factor in quasi-phase matched condition changes with the variation of refringence, to make up non-linear
Phase mismatch in the process, therefore the size and Orientation of the electric field loaded by regulation electric field unit 101, can be adjusted quasi- phase
Matching condition, and then regulate and control the polarization state and intensity of non-paraxial autoacceleration frequency multiplication light beam.
Filter unit 103, for filtering out the basic frequency beam across quasi-phase matched unit 102, obtaining from received light beam
Non-paraxial autoacceleration frequency multiplication light beam after to regulation.
Specifically, in the case where basic frequency beam is not completely converted into non-paraxial autoacceleration frequency multiplication light beam under normal conditions,
The light beam that quasi-phase matched unit 102 is emitted includes: the non-paraxial autoacceleration frequency multiplication light beam after basic frequency beam and regulation.In order to obtain
Non-paraxial autoacceleration frequency multiplication light beam after taking regulation filters out basic frequency beam using filter unit 103, and non-after retaining regulation is close to
Axis autoacceleration frequency multiplication light beam.In practical applications, filter unit 103 can be filter plate.
Further, the non-paraxial autoacceleration frequency multiplication light beam after the regulation that filter unit 103 is emitted is non-being close in frequency domain
Axis autoacceleration frequency multiplication light beam, then the device further includes Fourier transformation unit 104.Fourier transformation unit 104, setting are filtering
The rear end of unit 103, for receiving the non-paraxial autoacceleration frequency multiplication light beam from the frequency domain that filter unit 103 is emitted, and will frequency
Non-paraxial autoacceleration frequency multiplication light beam in domain carries out Fourier transform, by the non-paraxial autoacceleration frequency multiplication light beam in frequency domain by frequency domain
It is transformed into spatial domain, obtains the non-paraxial autoacceleration frequency multiplication light beam in spatial domain.In practical applications, Fourier transformation unit
104 can be fourier transform lens, and the non-paraxial autoacceleration frequency multiplication light beam in spatial domain is projected to screen 105, shows non-be close to
Axis autoacceleration frequency multiplication light beam, as shown in Figure 1.
Further, the direction of an electric field of electric field unit 101 and the incident direction of basic frequency beam are vertical, in quasi-phase matched
When unit 102 is converted basic frequency beam according to quasi-phase matched condition, using the maximum of quasi-phase matched unit 102
Electro-optic coefficient, to improve the efficiency that basic frequency beam is converted into non-paraxial autoacceleration frequency multiplication light beam.
Further, quasi-phase matched unit 102 is optical superlattice, and optical superlattice is to be a kind of dielectric constant with sky
Between periodically variable optical microstructures material, the mode for generalling use external electric field poling crystal acquires.Optics is super brilliant
The polarization pattern of lattice is as shown in Figure 2.
Wherein, the polarization formula of optical superlattice includes:
χ(2)(x, y)=dijsquare(T,D)。
In formula, dijIndicate that the nonlinear optical coefficients of quasi-phase matched unit 102, square (T, D) indicate that cycle T is 2
π, the square wave function that range is [- 1,1] and duty ratio is D%, fxIndicate the reciprocal lattice vector in the direction x, the direction x indicates basic frequency beam
The direction of propagation, fcIndicate transverse modulation frequency,Indicate the phase of the fourier spectra of basic frequency beam, Λ is indicated on the direction of propagation
Polarization cycle length.
In addition, the polarization formula of optical superlattice expands into fourier integral form:
In formula, GmIndicate the Fourier transform coefficient of m rank.
From above formula it can be seen that, for m=1, optimal polarization duty ratio D=0.5, Fourier transform coefficient at this time
GmMaximum, however the Fourier transform coefficient G of 0 rank at this timem=0.For m=2, optimal polarization duty ratio D=0.25 or
D=0.75, and the Fourier transform coefficient G of 0 rank at this timem≠ 0, it can be used for the regulation of linear electro-optic effect.Assuming that playing branch
Reciprocal lattice vector with effect is 2 rank reciprocal lattice vectors, is expressed as 2fx.Maximum nonlinear optical coefficients d in order to obtain33(d33=
13.8pm/V), using ee → e type quasi-phase matched.Basic frequency beam is propagated along the direction x shown in FIG. 1.Electric field unit at this time
101 do not load quasi-phase matched condition when electric field are as follows:
In formula, Δ k indicates the phase mismatch factor, k1,k2The respectively wave of basic frequency beam and non-paraxial autoacceleration frequency multiplication light beam
Arrow, λ1,λ2The respectively wavelength of basic frequency beam and non-paraxial autoacceleration frequency multiplication light beam.
Further, quasi-phase matched unit 102 be it is period polarized after lithium tantalate.The wavelength X of basic frequency beam1=
1.064 μm (unit: micron), the wavelength X of non-paraxial autoacceleration frequency multiplication light beam2=0.532 μm.According to STL crystal
Sellmeier formula, the e optical index that basic frequency beam and non-paraxial autoacceleration frequency multiplication light beam can be calculated is respectively n1e=
2.13365,n2e=2.1999, polarization week is calculated in quasi-phase matched condition when not loading electric field according to electric field unit 101
Phase length Λ=2 λ2/(n2e-n1e)=16.06 μm.As shown in Figure 1, the direction of an electric field of electric field unit 101 is the direction x, then work as electricity
When the direction of an electric field that unit 101 loads is along z-axis, using the maximum electric light system of the lithium tantalate after period polarized
Number.Quasi-phase matched condition when then electric field unit 101 loads electric field becomes:
In formula, Δ n (E) be electric field unit 101 caused by it is period polarized after lithium tantalate variations in refractive index it is poor, r33
Be it is period polarized after lithium tantalate maximum electro-optic coefficient, E be the electric field unit 101 load electric field intensity
Value.
Then, the e optical index of basic frequency beam and non-paraxial autoacceleration frequency multiplication light beam is respectively as follows:
The variations in refractive index of lithium tantalate after then period polarized caused by electric field unit 101 is poor are as follows:
Above formula shows to change the intensity value of the electric field of lithium tantalate of the load of electric field unit 101 after period polarized, electricity
Caused by unit 101 it is period polarized after the variations in refractive index difference of lithium tantalate change therewith, and pass through electric field unit 101
Load electric field when quasi-phase matched condition and electric field unit 101 caused by it is period polarized after lithium tantalate refractive index become
Change difference correlation, then the electric field of lithium tantalate of the quasi-phase matched condition with the load of electric field unit 101 after period polarized
Intensity value variation and change, in practical applications, regulation electric field unit 101 can be passed through and load tantalic acid after period polarized
The intensity value of the electric field of crystalline lithium, and regulate and control the polarization state and intensity of non-paraxial autoacceleration frequency multiplication light beam.
As shown in figure 3, the figure (a) in Fig. 3 is the non-paraxial autoacceleration frequency multiplication light beam under the conditions of meeting quasi-phase matched
It exports, the figure (b) in Fig. 3 is the output of the non-paraxial autoacceleration frequency multiplication light beam under the conditions of being unsatisfactory for quasi-phase matched.
In embodiments of the present invention, basic frequency beam is changed into according to quasi-phase matched condition by quasi-phase matched unit
Non-paraxial autoacceleration frequency multiplication light beam, and electric field is loaded by electric field unit and gives quasi-phase matched unit, adjust quasi-phase matched item
Part, thus regulate and control the polarization state and intensity of the non-paraxial autoacceleration frequency multiplication light beam of outgoing, rather than by changing propagation medium
Light beam is regulated and controled, the flexibility of light beam regulation is improved.And non-paraxial can be added certainly by Fourier transformation unit
Fast frequency multiplication light beam carries out null tone conversion.
Referring to fig. 4, Fig. 4 is the non-paraxial autoacceleration frequency multiplication light beam regulation method in second embodiment provided by the invention
Implementation process schematic diagram, applied to the non-paraxial autoacceleration frequency multiplication light beam regulation device in embodiment as shown in Figure 1 to Figure 3.
This method mainly comprises the steps that
201, it will polarize to polarized crystal, and obtain quasi-phase matched unit.
202, by the basic frequency beam from light source from the incident quasi- phase in the direction of the direction of an electric field perpendicular to the electric field unit
Position matching unit.
203, it controls the quasi-phase matched unit and is converted to the basic frequency beam from light source according to quasi-phase matched condition
Non-paraxial autoacceleration frequency multiplication light beam.
204, control electric field unit load electric field gives quasi-phase matched unit, so as to generate inside the quasi-phase matched unit
Linear electro-optic effect.
205, it controls the quasi-phase matched unit and adjusts the quasi-phase matched condition using the linear electro-optic effect, with regulation
The polarization state and intensity of the non-paraxial autoacceleration frequency multiplication light beam, and the non-paraxial autoacceleration frequency multiplication light beam after regulation is transmitted to
Filter unit.
206, the filter unit is controlled from received light beam, filters out the basic frequency beam across the quasi-phase matched unit,
Non-paraxial autoacceleration frequency multiplication light beam after obtaining the regulation.
207, the non-paraxial autoacceleration frequency multiplication light beam after the regulation of filter unit outgoing is that the non-paraxial in frequency domain adds certainly
Fast frequency multiplication light beam then controls Fourier transformation unit and receives the non-paraxial autoacceleration frequency multiplication from the frequency domain that the filter unit is emitted
Light beam, and the non-paraxial autoacceleration frequency multiplication light beam in the frequency domain is subjected to Fourier transform, obtain non-paraxial in spatial domain from
Accelerate frequency multiplication light beam.
Further, it by following formula, will polarize to polarized crystal, and obtain the quasi-phase matched unit::
χ(2)(x, y)=dijsquare(T,D)；
In formula, dijIndicate the nonlinear optical coefficients of the quasi-phase matched unit, square (T, D) indicate cycle T be 2 π,
The square wave function that range is [- 1,1] and duty ratio is D%, fxIndicate the reciprocal lattice vector in the direction x, the direction x indicates the basic frequency beam
The direction of propagation, fcIndicate transverse modulation frequency,Indicate the phase of the fourier spectra of the basic frequency beam, Λ is indicated on the direction of propagation
Polarization cycle length.
In embodiments of the present invention, basic frequency beam is changed into according to quasi-phase matched condition by quasi-phase matched unit
Non-paraxial autoacceleration frequency multiplication light beam, and electric field is loaded by electric field unit and gives quasi-phase matched unit, adjust quasi-phase matched item
Part, thus regulate and control the polarization state and intensity of the non-paraxial autoacceleration frequency multiplication light beam of outgoing, rather than by changing propagation medium
Light beam is regulated and controled, the flexibility of light beam regulation is improved.And by Fourier transformation unit to non-paraxial autoacceleration
Frequency multiplication light beam carries out null tone conversion.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, there is no the portion being described in detail in some embodiment
Point, reference can be made to the related descriptions of other embodiments.
The above are the descriptions of non-paraxial autoacceleration frequency multiplication light beam regulation device provided by the present invention and method, for ability
The those skilled in the art in domain, thought according to an embodiment of the present invention have change in specific embodiments and applications
Place, to sum up, the contents of this specification are not to be construed as limiting the invention.
Claims (10)
1. a kind of non-paraxial autoacceleration frequency multiplication light beam regulation device, which is characterized in that described device includes: electric field unit, quasi- phase
Position matching unit and filter unit；
The electric field unit is electrical connected with the quasi-phase matched unit, for loading electric field to the quasi-phase matched list
Member, so as to generate linear electro-optic effect inside the quasi-phase matched unit；
The quasi-phase matched unit, is additionally arranged at the front end of the filter unit, is used for according to quasi-phase matched condition in the future
Non-paraxial autoacceleration frequency multiplication light beam is converted to from the basic frequency beam of light source, and adjusts the quasi- phase using the linear electro-optic effect
Position matching condition, to regulate and control the polarization state and intensity of the non-paraxial autoacceleration frequency multiplication light beam, and by the non-paraxial after regulation
Autoacceleration frequency multiplication light beam is transmitted to the filter unit；
The filter unit, for filtering out the basic frequency beam across the quasi-phase matched unit, obtaining from received light beam
Non-paraxial autoacceleration frequency multiplication light beam after the regulation.
2. non-paraxial autoacceleration frequency multiplication light beam regulation device as described in claim 1, which is characterized in that the filter unit outgoing
Regulation after non-paraxial autoacceleration frequency multiplication light beam be frequency domain in non-paraxial autoacceleration frequency multiplication light beam, then described device further include
Fourier transformation unit；
The rear end of the filter unit is arranged in the Fourier transformation unit, for receiving from filter unit outgoing
Non-paraxial autoacceleration frequency multiplication light beam in frequency domain, and the non-paraxial autoacceleration frequency multiplication light beam in the frequency domain is subjected to Fourier change
It changes, obtains the non-paraxial autoacceleration frequency multiplication light beam in spatial domain.
3. non-paraxial autoacceleration frequency multiplication light beam regulation device as described in claim 1, which is characterized in that the electric field unit
Direction of an electric field is vertical with the incident direction of the basic frequency beam.
4. non-paraxial autoacceleration frequency multiplication light beam regulation device as described in claim 1, which is characterized in that the quasi-phase matched
Unit is optical superlattice, then the polarization formula of the optical superlattice includes:
χ(2)(x, y)=dijsquare(T,D)；
In formula, dijIndicate that the nonlinear optical coefficients of the quasi-phase matched unit, square (T, D) indicate that cycle T is 2 π, model
Enclose the square wave function that for [- 1,1] and duty ratio is D%, fxIndicate the reciprocal lattice vector in the direction x, the direction x indicates the basic frequency beam
The direction of propagation, fcIndicate transverse modulation frequency,Indicate the phase of the fourier spectra of the basic frequency beam, Λ indicates the direction of propagation
On polarization cycle length.
5. non-paraxial autoacceleration frequency multiplication light beam regulation device as described in claim 1, which is characterized in that the quasi-phase matched
Unit be it is period polarized after lithium tantalate.
6. a kind of non-paraxial autoacceleration frequency multiplication light beam regulates and controls method, which is characterized in that applied to appointing in such as claim 1 to 5
Non-paraxial autoacceleration frequency multiplication light beam regulation device described in one, which comprises
It controls the quasi-phase matched unit and the basic frequency beam from light source is converted to by non-paraxial according to quasi-phase matched condition
Autoacceleration frequency multiplication light beam；
The electric field unit load electric field is controlled to the quasi-phase matched unit, so as to produce inside the quasi-phase matched unit
Raw linear electro-optic effect；
It controls the quasi-phase matched unit and adjusts the quasi-phase matched condition using the linear electro-optic effect, to regulate and control
The polarization state and intensity of non-paraxial autoacceleration frequency multiplication light beam are stated, and the non-paraxial autoacceleration frequency multiplication light beam after regulation is transmitted to
The filter unit；
The filter unit is controlled from received light beam, the basic frequency beam across the quasi-phase matched unit is filtered out, obtains
Non-paraxial autoacceleration frequency multiplication light beam after the regulation.
7. non-paraxial autoacceleration frequency multiplication light beam as claimed in claim 6 regulates and controls method, which is characterized in that the filter unit outgoing
Regulation after non-paraxial autoacceleration frequency multiplication light beam be frequency domain in non-paraxial autoacceleration frequency multiplication light beam, then the method is also wrapped
It includes:
It controls the Fourier transformation unit and receives the non-paraxial autoacceleration frequency doubled light from the frequency domain that the filter unit is emitted
Beam, and the non-paraxial autoacceleration frequency multiplication light beam in the frequency domain is subjected to Fourier transform, obtain non-paraxial in spatial domain from
Accelerate frequency multiplication light beam.
8. non-paraxial autoacceleration frequency multiplication light beam as claimed in claim 6 regulates and controls method, which is characterized in that the control standard
Basic frequency beam from light source is converted to non-paraxial autoacceleration frequency multiplication light beam according to quasi-phase matched condition by phase matching components
Before, comprising:
By the basic frequency beam from light source from the incident quasi- phase in the direction of the direction of an electric field perpendicular to the electric field unit
With unit.
9. non-paraxial autoacceleration frequency multiplication light beam as claimed in claim 8 regulates and controls method, which is characterized in that described by the fundamental frequency
Light beam is before the incident quasi-phase matched unit in the direction of the direction of an electric field perpendicular to the electric field unit, comprising:
It will polarize to polarized crystal, and obtain the quasi-phase matched unit.
10. non-paraxial autoacceleration frequency multiplication light beam as claimed in claim 9 regulates and controls method, which is characterized in that by following formula,
It will polarize to polarized crystal, and obtain the quasi-phase matched unit:
χ(2)(x, y)=dijsquare(T,D)；
In formula, dijIndicate that the nonlinear optical coefficients of the quasi-phase matched unit, square (T, D) indicate that cycle T is 2 π, model
Enclose the square wave function that for [- 1,1] and duty ratio is D%, fxIndicate the reciprocal lattice vector in the direction x, the direction x indicates the basic frequency beam
The direction of propagation, fcIndicate transverse modulation frequency,Indicate the phase of the fourier spectra of the basic frequency beam, Λ indicates the direction of propagation
On polarization cycle length.
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| CN201811277694.8A CN109239948B (en) | 2018-10-30 | 2018-10-30 | Non-paraxial self-acceleration frequency multiplication light beam regulating and controlling device and method |
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