CN108956479A - Radial polarisation optical illumination ellipsoidal reflector focuses optical harmonic and generates exciting method - Google Patents

Radial polarisation optical illumination ellipsoidal reflector focuses optical harmonic and generates exciting method Download PDF

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Publication number
CN108956479A
CN108956479A CN201810526930.9A CN201810526930A CN108956479A CN 108956479 A CN108956479 A CN 108956479A CN 201810526930 A CN201810526930 A CN 201810526930A CN 108956479 A CN108956479 A CN 108956479A
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China
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optical
harmonic
ellipsoidal
radial polarisation
sample
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王伟波
刘俭
吴必伟
谭久彬
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Harbin Institute of Technology
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Harbin Institute of Technology
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/21—Polarisation-affecting properties
    • G01N21/211—Ellipsometry
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/21—Polarisation-affecting properties
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/06—Illumination; Optics
    • G01N2201/063—Illuminating optical parts
    • G01N2201/0636—Reflectors
    • G01N2201/0637—Elliptic
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/06—Illumination; Optics
    • G01N2201/069—Supply of sources
    • G01N2201/0696—Pulsed
    • G01N2201/0697—Pulsed lasers

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

Radial polarisation optical illumination ellipsoidal reflector focuses optical harmonic generation exciting method and belongs to nonlinear optics fields of measurement；The pulse laser that femto-second laser issues passes through collimator and extender, becomes focusing on sample by ellipsoidal mirror focusing system after radial polarisation light by polarization form converter, to carry out the excitation of sample interior optical harmonic signal.The ellipsoidal mirror focusing system includes large-numerical aperture object lens and ellipsoidal mirror；The focus of the large-numerical aperture object lens and the over focus F of ellipsoidal reflector1It is overlapped, the perifocus F of ellipsoidal mirror2On the surface of sample；Using the present invention, perifocus F can be improved2Locate the ratio between electric field axial direction polarized component maximum of intensity and cross-polarization component intensity maximum value, to improve the intensity of inspired optical harmonic.In addition, the harmonic wave polarization intensity distribution that the present invention can also make the relatively large sample of nonlinear factor relevant to transverse electric field component be inspired keeps mono-modal.

Description

Radial polarisation optical illumination ellipsoidal reflector focuses optical harmonic and generates exciting method
Technical field
The invention belongs to nonlinear optics fields of measurement, relate generally to one kind and are used in nonlinear optics, institute's study sample Optical harmonic excitation method.
Background technique
It is generated using the nonlinear optical effect of sample itself, such as second harmonic, triple-frequency harmonics generates, and can carry out biology The micro-imaging of sample unstressed configuration label, the micro-structure detection of nano-device, the diagnosis etc. of pathogenic mechanism.Optical non-linear effect Generation need the excitation of strong light, such as the focal point assembled in laser.Under normal circumstances, harmonic wave excitation needs large-numerical aperture object Mirror carries out tightly focused illumination.The convergent angle of conventional lenses is less than pi/2, cannot achieve the convergence excitation of greater angle.Radial polarisation Light has strong axial polarized component at the focal plane of focusing, is a kind of ideal illumination optical mode of harmonic generation.But for cross It is much larger than to the relevant optical nonlinearity coefficient of polarized component for the sample of other nonlinear optical coefficients, radial polarisation light swashs The optical harmonic polarization field given is likely to occur bimodal mode, to reduce harmonic imaging resolution ratio.Using ellipsoidal mirror It focuses, the tightly focused that angle may be implemented greater than pi/2 illuminates.In addition, radial polarized light beam ellipsoidal mirror focusing under, The ratio between axial polarized component maximum of intensity and radial component maximum of intensity for showing at focal plane are greater than identical numerical aperture Radial polarized light beam under the lens focus of diameter.
Summary of the invention
The present invention, which devises a kind of radial polarisation optical illumination ellipsoidal reflector and focuses optical harmonic, generates exciting method, can be with Solution optical nonlinearity coefficient relevant to cross-polarization component is much larger than in the sample of other nonlinear optical coefficients and inspires Harmonic wave polarization field the problem of bimodal distribution is presented, and the resolution ratio of harmonic wave micro-imaging can be improved.
The object of the present invention is achieved like this:
Radial polarisation optical illumination ellipsoidal reflector focuses optical harmonic and generates exciting method, which generates excitation side The theoretical basis of method is that Wolf diffraction integral is theoretical.The pulse laser that femto-second laser issues passes through polarization state by collimation Converter becomes focusing on sample by ellipsoidal mirror focusing system after radial polarisation light.By establishing radial polarisation illumination The trivector model of near focal point electric field under bright ellipsoidal mirror focusing system focusing, in conjunction with the nonlinear polarization of sample Rate tensor matrix can calculate inspired harmonic wave polarizing field strength distribution.The ellipsoidal mirror focusing system Including large-numerical aperture object lens and ellipsoidal mirror；The focus of the large-numerical aperture object lens and the over focus of ellipsoidal reflector F1It is overlapped, the perifocus F of ellipsoidal mirror2On the surface of sample, and then cause optical non-linear effect, inspires light Learn harmonic wave.The life of optical nonlinearity harmonic wave is used for it is characterized in that radial polarisation optical illumination is combined with ellipsoidal mirror focusing At excitation.
Above-mentioned radial polarisation optical illumination ellipsoidal reflector focuses optical harmonic generation method, it is characterised in that utilizes ellipsoid The focus characteristics of face reflecting mirror are, it can be achieved that optical harmonic tightly focused of the numerical aperture greater than 1 excites.
Above-mentioned radial polarisation optical illumination ellipsoidal reflector focuses optical harmonic generation method, it is characterised in that passes through enhancing The axial polarized component of focal plane electric field inhibits the bimodal distribution of specific sample harmonic wave polarization field.
Since in harmonic wave exciting method of the invention, ellipsoidal mirror is focused and radial polarisation optical illumination combines, Axial polarized component maximum of intensity and the ratio between radial polarisation component maximum of intensity at focal plane is saturating compared to same numerical aperture Mirror has further raising under focusing；It is this to be conjointly employed in harmonic wave excitation, the mono-modal of harmonic wave polarization field may be implemented, Ghost image in harmonic carcellation micro-imaging improves imaging resolution.
Detailed description of the invention
Fig. 1 is that radial polarisation optical illumination ellipsoidal reflector focuses optical harmonic generation exciting method schematic diagram.
Fig. 2 is that ellipsoidal mirror focuses lower harmonic generation vector model coordinate definition figure.
Fig. 3 is ellipsoidal mirror and conventional lenses focus the second harmonic polarization that lower corresponding KTP sample excitation goes out Field intensity profiles versus figure.
In Fig. 1: 1 femto-second laser, 2 collimator and extender devices, 3 polarizers, 4 radial polarisation photoconverters, 5 large-numerical aperture objects Mirror, 6 ellipsoidal mirrors, 7 samples, 8 three-dimensional objective tables.
Specific embodiment
The specific embodiment of the invention is described in further detail with reference to the accompanying drawing.
The radial polarisation optical illumination ellipsoidal reflector of the present embodiment focuses optical harmonic and generates exciting method schematic diagram such as Fig. 1 It is shown.The optical harmonic exciting method includes femto-second laser 1, collimator and extender device 2, the polarizer 3, radial polarisation photoconverter 4, Large-numerical aperture object lens 5, ellipsoidal mirror 6, sample 7, three-dimensional objective table 8；Femto-second laser 1 issue pulse laser beam according to Secondary to pass through collimator and extender device 2, after radial polarisation photoconverter 4, it is anti-to converge to ellipsoid by large-numerical aperture object lens 5 for the polarizer 3 6 surface of mirror is penetrated, is converged at sample 7 using ellipsoidal mirror reflection, and then cause optical non-linear effect, inspires light Learn harmonic wave；Wherein sample fixed placement is on three-dimensional objective table 8；The focuses of large-numerical aperture object lens and ellipsoidal mirror it is remote Focus F1It is overlapped, the perifocus F of ellipsoidal mirror2On the surface of sample.
In the present embodiment, it is as shown in Figure 2 that ellipsoidal mirror focuses lower harmonic generation vector model coordinate definition figure.
Radial polarisation light converges to a focus F of ellipsoidal mirror 6 by large-numerical aperture object lens 51, then ellipse The reflection of ball mirror 6 converges to another focus F2.The symmetry axis of light beam is z-axis, and φ is side of the meridional plane relative to x-axis Parallactic angle, α are the convergence angle of lens, and θ is the convergence angle of ellipsoidal mirror.
Theoretical, the available F based on Wolf diffraction integral2Neighbouring field distribution, including axial polarized component and Radial polarisation component:
Wherein, A=kf (a+c)/[2 (a-c)], k=2 π/λ, λ are lambda1-wavelength, and f is large-numerical aperture object lens Focal length.ρs, zsThe respectively lateral coordinates and axial coordinate of focal zone, α=artan [(t-2c) tan θ/t] are aplanasia The convergence angle of lens, t=[a2c·tan2θ+ab2(1+tan2θ)]/(a2tan2θ+b2)+c, t is M and F1Between along optical axis side To distance.l0(α) is the amplitude distribution function at lens pupil, and θ is the convergence angle of ellipsoidal mirror, θmaxFor looping pit The maximum value at diameter illumination lower convergence angle, θ related with the numerical aperture of ellipsoidal mirrormax=arcsin (NA/n), NA are ellipse The numerical aperture of spherical reflector.Jn() is first kind n rank Bessel function.
In the present embodiment, ellipsoidal mirror and conventional lenses focus lower corresponding second harmonic polarizing field strength focal plane Profiles versus's figure is as shown in Figure 3.When 6 major semiaxis of ellipsoidal mirror and semi-minor axis length ratio are 5: 3, can obtain The KTP sample second harmonic polarizing field strength corresponding in the case where the ellipsoidal mirror and conventional lenses of NA=1 focus is in focal plane On distribution.As can be seen that the second harmonic polarizing field strength gone out that KTP sample is excited is distributed under conventional lenses focusing Bimodal mode is presented, and Unimodal Distribution is then presented in the second harmonic polarizing field strength distribution under ellipsoidal mirror focusing, and 20% under the focusing of halfwidth boil down to conventional lenses.

Claims (3)

1. a kind of radial polarisation optical illumination ellipsoidal reflector focuses optical harmonic and generates exciting method, implementation are as follows: femtosecond The pulse laser that laser issues is collimated by colimated light system, by ellipse after polarization form converter becomes radial polarisation light Spherical reflector focusing system focuses at sample；The theoretical basis of this method is that Wolf diffraction integral is theoretical, passes through foundation The trivector model of near focal point electric field under the focusing of radial polarisation optical illumination ellipsoidal mirror focusing system, in conjunction with sample Non-linear susceptibility tensor matrix, inspired harmonic wave polarizing field strength distribution can be calculated；The ellipsoid is anti- Penetrating mirror focusing system includes large-numerical aperture object lens and ellipsoidal mirror；The focus and ellipsoid of the large-numerical aperture object lens are anti- Penetrate the over focus F of mirror1It is overlapped, the perifocus F of ellipsoidal mirror2On the surface of sample；It is characterized in that by radial polarisation Optical illumination focuses the excitation combined for optical nonlinearity harmonic generation with ellipsoidal mirror.
2. radial polarisation optical illumination ellipsoidal reflector according to claim 1 focuses optical harmonic and generates exciting method, It is characterized in that realizing that optical harmonic tightly focused of the numerical aperture greater than 1 excites using the focus characteristics of ellipsoidal mirror.
3. radial polarisation optical illumination ellipsoidal reflector according to claim 1 focuses optical harmonic and generates exciting method, It is characterized in that the axial polarized component for enhancing focal plane electric field by ellipsoidal mirror focusing is realized and inhibits specific sample humorous The bimodal distribution of wave polarization field.
CN201810526930.9A 2018-05-23 2018-05-23 Radial polarisation optical illumination ellipsoidal reflector focuses optical harmonic and generates exciting method Pending CN108956479A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110638424A (en) * 2019-09-19 2020-01-03 哈尔滨工业大学 Scanning light sheet harmonic wave microscopic imaging method and device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101520304A (en) * 2009-03-30 2009-09-02 哈尔滨工业大学 Phase-shifting secondary interference confocal soft-pinhole detection device and method
CN202002880U (en) * 2010-12-20 2011-10-05 福建师范大学 Lossless real-time dynamic detection device for biological tissue polarization imaging
CN103075974A (en) * 2012-12-14 2013-05-01 哈尔滨工业大学 Radial polarized lighting ellipsoidal surface pupil amplitude filtering confocal imaging device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101520304A (en) * 2009-03-30 2009-09-02 哈尔滨工业大学 Phase-shifting secondary interference confocal soft-pinhole detection device and method
CN202002880U (en) * 2010-12-20 2011-10-05 福建师范大学 Lossless real-time dynamic detection device for biological tissue polarization imaging
CN103075974A (en) * 2012-12-14 2013-05-01 哈尔滨工业大学 Radial polarized lighting ellipsoidal surface pupil amplitude filtering confocal imaging device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110638424A (en) * 2019-09-19 2020-01-03 哈尔滨工业大学 Scanning light sheet harmonic wave microscopic imaging method and device

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