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Raman scattering by polaritons in Ti:LiNbO 3 waveguides
Author(s) -
Langbein U.,
Lederer F.,
Ponath H.E.,
Trutschel U.
Publication year - 1986
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250170115
Subject(s) - polariton , raman scattering , raman spectroscopy , anisotropy , slab , optics , lithium niobate , dispersion (optics) , proton , wavelength , materials science , physics , quantum mechanics , geophysics
Abstract A general theory of Raman scattering in piezoelectric slab waveguides is presented. If the anisotropy of the uniaxial waveguide material is sufficiently large, incident slab‐guided waves can be scattered by polaritons of the upper branch of the polariton dispersion curve. The angular dependence ω 2 (θ) of the scattered‐wave frequency has been calculated in detail, for both y ‐ and z ‐cut Ti:LiNbO 3 waveguides in the polariton frequency range ω p =900–5160 cm −1 (pump wavelength 4880 Å). The detection of weak proton vibrations within the strong polariton Raman spectrum of proton‐exchanged Ti:LiNbO 3 waveguides is discussed.