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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 19, Iss. 7 — Jul. 1, 2002
  • pp: 1604–1610

Green’s function formulation for third-harmonic generation microscopy

Ji-Xin Cheng and X. Sunney Xie  »View Author Affiliations


JOSA B, Vol. 19, Issue 7, pp. 1604-1610 (2002)
http://dx.doi.org/10.1364/JOSAB.19.001604


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Abstract

We report a theoretical study of third-harmonic generation (THG) microscopy by use of a Green’s function formulation. The third-harmonic signal under a tight-focusing condition is calculated for samples with various shapes and sizes. Our results show that THG signals can be efficiently generated at a sizable interface perpendicular or parallel to the optical axis or from a small object with a size comparable to the width of the axial excitation intensity profile. The signal-generation mechanism of THG microscopy is explained by a modified phase-matching condition, |k3-3(k1+Δkg)|lπ, where Δkg is the wave vector mismatch induced by the Gouy phase shift of the focused excitation field. The relation of the THG power and radiation pattern to the orientation of an interface is investigated. A comparison between signal generation in THG microscopy and that in coherent anti-Stokes Raman scattering microscopy is given.

© 2002 Optical Society of America

OCIS Codes
(180.5810) Microscopy : Scanning microscopy
(180.6900) Microscopy : Three-dimensional microscopy
(190.4160) Nonlinear optics : Multiharmonic generation
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing

Citation
Ji-Xin Cheng and X. Sunney Xie, "Green's function formulation for third-harmonic generation microscopy," J. Opt. Soc. Am. B 19, 1604-1610 (2002)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-19-7-1604

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