CN205750138U - A kind of generation system of femtosecond column vector beam - Google Patents
A kind of generation system of femtosecond column vector beam Download PDFInfo
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- CN205750138U CN205750138U CN201620585587.1U CN201620585587U CN205750138U CN 205750138 U CN205750138 U CN 205750138U CN 201620585587 U CN201620585587 U CN 201620585587U CN 205750138 U CN205750138 U CN 205750138U
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Abstract
This utility model relates to the generation system of a kind of femtosecond column vector beam, including excitation source unit, Polarization Modulation unit, odd-order femtosecond column vector beam modulating unit and even-order femtosecond column vector beam modulating unit, odd-order femtosecond column vector beam modulating unit includes the first wave plate group modulating unit and several the second wave plate group modulating units, and even-order femtosecond column vector beam modulating unit includes several the second wave plate group modulating units；First wave plate group modulating unit includes successively that along optical path direction the first vortex wave plate and the first half-wave plate, the m value of the first vortex wave plate are 1；Second wave plate group modulating unit includes successively that along optical path direction the second vortex wave plate and the second half-wave plate, the m value of the second vortex wave plate are 2.Linear polarization femtosecond laser beam can be modulated to the femtosecond column vector beam of random polarization exponent number by vortex wave plate combined by this utility model, is significant at Disciplinary Frontiers such as femtosecond processing, optic communication, optical tweezer manipulation, surface enhanced raman spectroscopy researchs.
Description
Technical field
This utility model belongs to light beam control technique field, particularly to the generation system of a kind of femtosecond column vector beam.
Background technology
In recent years, column vector beam (Cylindrical Vector Beams, CVB) is at microscopy, photoetching and material
The fields such as reason, surface phasmon optics, bio-photon, the manipulation of nano-particle and sign show huge potential application
Being worth, CVB light beam is increasingly becoming study hotspot both domestic and external as a kind of novel light beam.Femtosecond laser have uniqueness superpower with
Ultrafast characteristic, its superpower characteristic makes us can obtain high peak light intensity with relatively low pulse energy, induces ablation, two-photon
The phenomenons such as absorption, store at medical science, hyperfine micro Process, high density information and suffer from good development prospect in terms of record.
On this basis the two is combined, utilize femto-second laser to realize femtosecond CVB light source can the non-thread of observing samples further
Property effect, has important application potential at the aspect such as two-photon fluorescence, second_harmonic generation.Therefore, high-quality femtosecond CVB light
The generation of bundle, has important scientific value to carrying out relevant research further.
The production method of the CVB reported has a variety of, as combined half-wave plate method, and wave train compression method, nematic liquid crystal method, double
Refracting crystal method, sub-wavelength diffraction grating method, interfere the addition method, be inserted into special optical aperture in laser cavity, the cloth of taper
Rust prism or axicon lens, birefringence light beam displacement device based on discontinuous phase part etc..These prior aries are real
Strong by property, but femtosecond laser is still had to certain limitation.Such as, combination half-wave plate method is by the combination of each block margin
The impact of part diffraction effect, thus produce pseudo-polarization mode；Sub-wavelength diffraction grating method has the highest requirement to machining accuracy,
Require harsher at visible light wave range；Nematic liquid crystal method is only applicable to low power laser；Interfere the addition method orthogonal by two
The superposition of linearly polarized light beam TEM10 and TEM01 pattern produces, so that strictly calibrate light path, and disturbs any machinery
Dynamic very sensitive, stability is bad.It addition, we had used wave train compression method to produce highly purified CVB in previous work
Light beam, utilizes spiral position photo (Spiral Phase Plate) and a radial direction or angular polarization selector by linear polarization
Light is converted into CVB light beam, and additional two half-wave plates do polarization rotator can realize the CVB light beam of random polarization angle.But,
Two common issue that said method faces: one is that conversion efficiency is low, produce the capacity usage ratio of CVB less than 50%；Two are
Owing to a key property of femtosecond laser is the high time resolution of pulse, its pulse length, in fs magnitude, is adjusted by above method
During femtosecond laser processed, owing to thus result in spectrum light beam broadening repeatedly through multiple optics device during producing
Deng chromatic dispersion problem, thus have a strong impact on peak value and the time resolution characteristics of femto-second laser pulse.
Utility model content
Technical problem to be solved in the utility model is to provide the generation system of a kind of femtosecond column vector beam, it is achieved
Femtosecond laser is utilized to produce high-quality femtosecond column vector beam.This utility model is achieved in that
A kind of generation system of femtosecond column vector beam, including:
Excitation source unit, is used for producing femtosecond laser beam；
Polarization Modulation unit, for being modulated to linear polarization femtosecond laser beam by described femtosecond laser beam；
Described system also includes odd-order femtosecond column vector beam modulating unit and the modulation of even-order femtosecond column vector beam
Unit；
Described odd-order femtosecond column vector beam modulating unit includes the first wave plate group modulating unit and several second ripples
Sheet group modulating unit；
Described linear polarization femtosecond laser beam is through described first wave plate group modulating unit, thus is modulated to 1 rank femtosecond post and vows
Amount light beam；Described first wave plate group modulating unit includes the first vortex wave plate and the first half-wave plate successively along optical path direction, described
The m value of the first vortex wave plate is 1；
Described 1 rank femtosecond column vector beam sequentially passes through each the second of described odd-order femtosecond column vector beam modulating unit
Wave plate group modulating unit, thus it is modulated to odd-order femtosecond column vector beam；Described second wave plate group modulating unit is along light path side
To including the second vortex wave plate and the second half-wave plate successively, the m value of described second vortex wave plate is 2；
The quick shaft direction of described first vortex wave plate and the second vortex wave plate is along the circumferentially continuous rotation of wave plate；
Described even-order femtosecond column vector beam modulating unit includes several described second wave plate group modulating units；
Described linear polarization femtosecond laser beam sequentially passes through each the second of described even-order femtosecond column vector beam modulating unit
Wave plate group modulating unit, thus it is modulated to even-order femtosecond column vector beam.
Further, when needing to produce polarization direction along the femtosecond column vector beam changed counterclockwise, last along light path
The second half-wave plate in one the second wave plate group modulating unit retains；When needing to produce polarization direction along the femtosecond changed clockwise
During column vector beam, the second half-wave plate along last second wave plate group modulating unit of light path is removed.
Further, described first vortex wave plate and the second vortex wave plate are liquid crystal half-wave sheet.
Further, the fast axle of described first vortex wave plate along wave plate circumference rotate a circle time, the angle of quick shaft direction changes
Become π；The fast axle of described second vortex wave plate along wave plate circumference rotate a circle time, Angulation changes 2 π of quick shaft direction.
Further, described first vortex wave plate is consistent with the prime direction of the fast axle of each second vortex wave plate.
Further, the optical axis coincidence of the light beam of the optical axis of the first vortex wave plate and the described first vortex wave plate of entrance；Respectively
The optical axis coincidence of the light beam of the optical axis of the second vortex wave plate and the described second vortex wave plate of entrance.
Further, described excitation source unit is femto-second laser, and described Polarization Modulation unit is polaroid.
Compared with prior art, this utility model passes through the quick shaft direction vortex wave plate combined along the circumferentially continuous change of wave plate
The high efficiency of modulated generation random polarization exponent number, high-purity, the femtosecond column vector beam of high stability, by vortex wave plate
Rotation, also further light field can be carried out new modulation, femtosecond processing, optic communication, optical tweezer manipulation, surface-enhanced Raman dissipate
Penetrate the Disciplinary Frontiers such as research to be significant.
Accompanying drawing explanation
The generation system composition schematic diagram of Fig. 1: this utility model femtosecond column vector beam；
Fig. 2 a: the first vortex wave plate quick shaft direction schematic diagram；
Fig. 2 the b: the second vortex wave plate quick shaft direction schematic diagram；
Fig. 2 c: half-wave plate quick shaft direction schematic diagram；
Fig. 3 a: single order column vector beam polarization schematic diagram；
Fig. 3 b: second order column vector beam polarization schematic diagram.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing and enforcement
Example, is further elaborated to this utility model.
Principle involved by this utility model is as follows:
The Jones matrix of line polarized light is represented by:
Ei=[cos θ sin θ]T (1a)
Jones matrix for m rank CVB is represented by:
Wherein, θ represents the polarization direction of line of incidence polarisation and the angle of x-axis,Representing azimuth, m represents generation CVB light
The exponent number of bundle,Represent CVB interior deflector angle.Here the circumference that the exponent number m of vortex wave plate and the fast axle of wave plate circumferentially rotate
P is relevant for number, wherein m=2p.
Assume that the Jones matrix of m rank vortex wave plate is expressed as:
In order to produce the CVB light beam on m rank, need to meet:
Wherein " ± " polarization direction that represents m rank CVB is along changing clockwise or counterclockwise.In general, orthogonal
The CVB that incident illumination produces after vortex wave plate is the most orthogonal.Therefore, can will be changed clockwise further by formula 3
The Jones matrix M of m rank vortex wave plate be expressed as:
Counterclockwise the Jones matrix of the m rank vortex wave plate of change is expressed as:
Mm cAnd Mm aBetween there is following relation: Mm a=Mm c H0, wherein H0Represent fast axle half-wave plate in the horizontal direction.
For the sake of simplicity, we launch to be discussed in detail only for situation counterclockwise, and only need for clockwise situation
Half-wave plate is added in corresponding position.For in theory, utilize the vortex wave plate with Jones matrix shown in formula 4, I
Line polarisation just can be converted to the CVB of corresponding exponent number.But there is design and processing cost in the vortex wave plate for high-order
, between the vortex wave plate Jones matrix of different rank, there is following relation fortunately in the problem such as high:
Mm=Mm-nHMn(5a)
M-m=HMmH(5b)
By above formula it appeared that: the vortex Polarization Modulation device for arbitrary high-order can be by the whirlpool of two low orders
Rotatory polarization modulation device combined modulation produces；On the other hand, two half-wave plates can be passed through for negative rank vortex light polarization modulator
Modulation corresponding positive number rank vortex light polarization modulator produces.
Based on this, we can produce any high-order by the combination of the vortex Polarization Modulation wave plate of low order and half-wave plate
CVB light beam.Based on formula 5 (a), the CVB light beam of any high-order can be produced by single order and second order vortex wave plate, based on
Formula 5 (b), can produce by adding half-wave plate after corresponding positive number rank CVB for negative rank CVB.Used in this patent
The quick shaft direction of single order and second order vortex wave plate is as shown in accompanying drawing 2a, Fig. 2 b.
Ultimate principle of the present utility model is, first passing through Polarization Modulation unit, that the femtosecond laser beam of generation is modulated to line is inclined
Shake femtosecond laser beam, by vortex wave plate combined, linear polarization femtosecond laser beam is modulated to required polarization exponent number the most again and (is called for short
Exponent number) femtosecond column vector beam.The vortex wave plate that this utility model is used (includes the first vortex wave plate and the second vortex ripple
Sheet) be a kind of quick shaft direction along wave plate circumferentially continuous rotation liquid crystal half-wave sheet, its laser transmittance is up to more than 95%.By this
The radial polarisation of the linear polarization femtosecond laser beam that the hybrid modulation of vortex wave plate is incident and azimutal polarization, can produce high efficiency,
Highly purified femtosecond column vector beam.
The generation system of the femtosecond column vector beam that this utility model provides is for producing the femtosecond post vector light of arbitrary order
Bundle, shown in Fig. 1, is described as follows the critical piece of this system:
First system includes excitation source unit 1 and Polarization Modulation unit 2.Excitation source unit 1 is used for producing femtosecond and swashs
Light beam, Polarization Modulation unit 2 for being modulated to linear polarization femtosecond laser beam by femtosecond laser beam.Excitation source unit 1 uses and flies
Second laser instrument, Polarization Modulation unit 2 uses polaroid.
System also includes odd-order femtosecond column vector beam modulating unit and even-order femtosecond column vector beam modulating unit.
Linear polarization femtosecond laser beam is after beam splitter 3 beam splitting, and a road enters odd-order femtosecond column vector beam modulating unit, and another road is entered
Enter even-order femtosecond column vector beam modulating unit.
Odd-order femtosecond column vector beam modulating unit includes first wave plate group modulating unit 5 and several the second wave plate groups
Modulating unit 4.
Linear polarization femtosecond laser beam, through the first wave plate group modulating unit 5, is modulated to 1 through the first wave plate group modulating unit 5
Rank femtosecond column vector beam.Specifically, the first wave plate group modulating unit 5 includes the first vortex wave plate 501 successively along optical path direction
And first half-wave plate 502.The m value (m represents exponent number) of the first vortex wave plate 501 is 1, and its fast axle rotates a circle along wave plate circumference
Time, the Angulation changes π of quick shaft direction, can be used for modulating the exponent number of incident column vector beam so that it is exponent number plus or minus one.Linear polarization
After femtosecond laser beam is modulated by the first vortex wave plate 501, form 1 rank femtosecond column vector beam.First half-wave plate 502 changes 1
The change direction of the polarization direction of rank femtosecond column vector beam, makes the polarization direction femtosecond post vector along change counterclockwise
Light beam.1 rank femtosecond column vector beam after the first half-wave plate 502 modulation, after reflecting mirror 6 reflection, sequentially passes through odd-order
Each second wave plate group modulating unit 4 of femtosecond column vector beam modulating unit, often through a second wave plate group modulating unit 4,
The exponent number of femtosecond column vector beam increases by 2, after several the second wave plate group modulating units 4 are sequentially modulated, obtain odd-order and flies
Second column vector beam.Specifically, m rank (m=2x+1) femtosecond column vector beam can be by 1 the first wave plate group modulating unit 5 and x
Second wave plate group modulating unit 4 modulation produces.
Second wave plate group modulating unit 4 includes the second vortex wave plate 401 and the second half-wave plate 402 successively along optical path direction,
The m value (m represents exponent number) of the second vortex wave plate 401 is 2, its fast axle along wave plate circumference rotate a circle time, the angle of quick shaft direction
Change 2 π, can be used for modulating the exponent number of incident column vector beam so that it is exponent number adds 2 or subtracts 2, thus, 1 rank femtosecond column vector beam
Odd-order femtosecond column vector beam is obtained after several the second wave plate group modulating units 4 are modulated.
Even-order femtosecond column vector beam modulating unit includes several aforesaid second wave plate group modulating units 4.Line is inclined
Femtosecond laser beam of shaking sequentially passes through each second wave plate group modulating unit 4 of even-order femtosecond column vector beam modulating unit, often warp
Crossing a second wave plate group modulating unit 4, the exponent number of femtosecond column vector beam increases by 2, single through the modulation of several the second wave plate groups
After unit 4 is sequentially modulated, obtain even-order femtosecond column vector beam.Specifically, n rank (n=2x) femtosecond column vector beam can be by x
Second wave plate group modulating unit 4 modulation produces.
From the foregoing, the exponent number of the femtosecond column vector beam produced as required can determine that the elementary beam of native system
Modulated structure, i.e. needs how many first wave plate group modulating unit 5 and the second wave plate group modulating units 4.
Utilize this utility model, as long as by rotating regulation polaroid or the direction of vortex wave plate, it is possible to realize not
The consecutive variations of femtosecond column vector beam polarization direction is obtained on the premise of changing its exponent number.Fig. 2 a, 2b and 2c are first respectively
Vortex wave plate the 501, second vortex wave plate 401 and half-wave plate quick shaft direction distribution schematic diagram.When linearly polarized light beam is after wave plate,
To there is the change of 2 θ in polarization direction, wherein θ is the angle of line of incidence polarisation polarization direction and the fast between centers of wave plate.Fig. 3 a and 3b divides
It not that linearly polarized light beam produces single order column vector beam and linearly polarized light beam through the second vortex wave plate 401 through single order vortex wave plate
Produce second order column vector beam schematic diagram.It should be noted that in modulated process, each vortex wave plate (includes the first vortex ripple
Sheet 501 and the second vortex wave plate 401) need coaxial modulation, the prime direction of its fast axle of mesoscale eddies wave plate keeps consistent, and i.e. first
Vortex wave plate 501 is consistent with the prime direction of the fast axle of each second vortex wave plate 401, the optical axis of the first vortex wave plate 501 with enter
Enter the optical axis coincidence of the light beam of the first vortex wave plate 501, the optical axis of each second vortex wave plate 401 and entrance the second vortex wave plate
The optical axis coincidence of the light beam of 401.
It should also be noted that owing to the second half-wave plate 402 in each second wave plate group modulating unit 4 is for modulating warp
The change side of the polarization direction of the femtosecond column vector beam of the second vortex wave plate 401 output of this second wave plate group modulating unit 4
To (by change modulates along clockwise direction for change in the counterclockwise direction, or being along up time by change modulates in the counterclockwise direction
Pin direction changes), therefore, when needing, the femtosecond column vector beam producing the change clockwise of edge, polarization direction is (defined herein as
For positive number rank femtosecond column vector beam) time, the second half-wave plate 402 in last second wave plate group modulating unit 4 of light path
Should remove, because from the femtosecond post vector light of the second vortex wave plate 401 output of last the second wave plate group modulating unit 4
The polarization direction of bundle is along change clockwise, it is not necessary to be modulated again.When needs produce polarization direction along becoming counterclockwise
During femtosecond column vector beam (being defined herein as negative rank femtosecond column vector beam) changed, along last second wave plate of light path
The second half-wave plate 402 in group modulating unit 4 just needs to retain, with by from the second of last the second wave plate group modulating unit 4
The change direction of the polarization direction of the femtosecond column vector beam of vortex wave plate 401 output is adjusted to along the inverse time by along change clockwise
Pin changes.
This utility model also can carry out depression of order modulation to femtosecond column vector beam.Such as: l (l=m-n) rank femtosecond post vector
Light beam can be modulated generation through n the first vortex wave plate 501 successively by m rank column vector beam.
These are only preferred embodiment of the present utility model, not in order to limit this utility model, all in this practicality
Any amendment, equivalent and the improvement etc. made within novel spirit and principle, should be included in guarantor of the present utility model
Within the scope of protecting.
Claims (7)
1. the generation system of a femtosecond column vector beam, it is characterised in that including:
Excitation source unit, is used for producing femtosecond laser beam；
Polarization Modulation unit, for being modulated to linear polarization femtosecond laser beam by described femtosecond laser beam；
Described system also includes odd-order femtosecond column vector beam modulating unit and even-order femtosecond column vector beam modulating unit；
Described odd-order femtosecond column vector beam modulating unit includes the first wave plate group modulating unit and several the second wave plate groups
Modulating unit；
Described linear polarization femtosecond laser beam is through described first wave plate group modulating unit, thus is modulated to 1 rank femtosecond post vector light
Bundle；Described first wave plate group modulating unit includes the first vortex wave plate and the first half-wave plate successively along optical path direction, described first
The m value of vortex wave plate is 1；
Described 1 rank femtosecond column vector beam sequentially passes through each second wave plate of described odd-order femtosecond column vector beam modulating unit
Group modulating unit, thus it is modulated to odd-order femtosecond column vector beam；Described second wave plate group modulating unit depends on along optical path direction
Secondary the second vortex wave plate and the second half-wave plate of including, the m value of described second vortex wave plate is 2；
The quick shaft direction of described first vortex wave plate and the second vortex wave plate is along the circumferentially continuous rotation of wave plate；
Described even-order femtosecond column vector beam modulating unit includes several described second wave plate group modulating units；
Described linear polarization femtosecond laser beam sequentially passes through each second wave plate of described even-order femtosecond column vector beam modulating unit
Group modulating unit, thus it is modulated to even-order femtosecond column vector beam.
2. the system as claimed in claim 1, it is characterised in that when needing to produce polarization direction along the femtosecond post changed counterclockwise
During vector beam, the second half-wave plate along last second wave plate group modulating unit of light path retains；When needs produce polarization
When direction is along the femtosecond column vector beam of clockwise change, the second half along last second wave plate group modulating unit of light path
Wave plate is removed.
3. the system as claimed in claim 1, it is characterised in that described first vortex wave plate and the second vortex wave plate are liquid crystal
Half-wave plate.
4. system as claimed in claim 3, it is characterised in that the fast axle of described first vortex wave plate rotates along wave plate circumference
Zhou Shi, the Angulation changes π of quick shaft direction；The fast axle of described second vortex wave plate along wave plate circumference rotate a circle time, quick shaft direction
Angulation changes 2 π.
5. system as claimed in claim 3, it is characterised in that described first vortex wave plate and the fast axle of each second vortex wave plate
Prime direction consistent.
6. the system as claimed in claim 1, it is characterised in that the optical axis of the first vortex wave plate and the described first vortex ripple of entrance
The optical axis coincidence of the light beam of sheet；The optical axis weight of the light beam of the optical axis of each second vortex wave plate and the described second vortex wave plate of entrance
Close.
7. the system as claimed in claim 1, it is characterised in that described excitation source unit is femto-second laser, described polarization
Modulating unit is polaroid.
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| CN201620585587.1U CN205750138U (en) | 2016-06-15 | 2016-06-15 | A kind of generation system of femtosecond column vector beam |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105954880A (en) * | 2016-06-15 | 2016-09-21 | 深圳大学 | Generating system for femtosecond cylindrical vector beam |
| CN113050273A (en) * | 2021-03-19 | 2021-06-29 | 中国人民解放军陆军炮兵防空兵学院 | Direct-view method and device for generating arbitrary column vector polarized light based on vortex half-wave plate |
-
2016
- 2016-06-15 CN CN201620585587.1U patent/CN205750138U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105954880A (en) * | 2016-06-15 | 2016-09-21 | 深圳大学 | Generating system for femtosecond cylindrical vector beam |
| CN113050273A (en) * | 2021-03-19 | 2021-06-29 | 中国人民解放军陆军炮兵防空兵学院 | Direct-view method and device for generating arbitrary column vector polarized light based on vortex half-wave plate |
| CN113050273B (en) * | 2021-03-19 | 2022-09-20 | 中国人民解放军陆军炮兵防空兵学院 | Direct-view method and device for generating arbitrary column vector polarized light based on vortex half-wave plate |
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