Open AccessSecond harmonic generation from radiation to guided modes for the characterization of reverse-proton-exchanged waveguides
Author(s) -
Marco Marangoni,
Roberto Osellame,
Roberta Ramponi,
E. Giorgetti
Publication year - 2004
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/opex.12.000294
Subject(s) - optics , lithium niobate , planar , waveguide , second harmonic generation , radiation , prism , refractive index , materials science , radiation mode , coupling (piping) , leaky mode , characterization (materials science) , nonlinear optics , physics , single mode optical fiber , optical fiber , laser , computer graphics (images) , computer science , metallurgy
By prism-coupling an ordinary radiation mode into a lithium niobate planar waveguide, a second harmonic extraordinary guided mode can be generated if the proper coupling angle is chosen. By measuring this angle, the effective index of the radiation mode and thus of the interacting guided mode can be determined. This fact is exploited for the characterization of reverse-proton-exchanged waveguides, whose lowest order modes cannot be efficiently prism-coupled due to their confinement inside the sample.