Waveguides in Ti:LiNbO3 for second harmonic generation: Design and experimental tests
Authors: Ramponi R., Russo V., Magni V.C., Palchetti L., Osellame R., Zavelani-Rossi M.
Autors Affiliation: Dipartimento di Fisica, Politecnico di Milano, CEQSE-CNR, Milano, Italy; IROE-CNR, via Panciatichi 64, 50127 Firenze, Italy
Abstract: Second harmonic (SH) generation in optical waveguides is widely studied for its many applications. In order to obtain efficient non-linear phenomena in waveguides, it is very important that the optico-physical characteristics of the fabricated waveguides are exactly those foreseen in the project. This because in practical applications operation wavelength and temperature can rarely be adjusted to achieve phase-matching conditions. The present work describes a model that, one fixed the operation conditions, finds the optico-physical characteristics of Ti:LiNbO3 planar waveguides necessary to obtain SH generation and relates them to the fabrication parameters. Phase-matching conditions between the two interacting guided modes (fundamental and SH) are achieved by exploiting the material birefringence. The investigation is performed at a fundamental wavelength of 1.064 µm and at room temperature on Y-cut, X-propagation waveguides. The waveguides, fabricated according to our design, were then characterized at different wavelengths. Experimental tests of SH generation confirmed the goodness of the model proposed. ©2004 Copyright SPIE – The International Society for Optical Engineering.
KeyWords: Experiments; Fabrication; Harmonic generation; Integrated circuits; Integrated optics; Integrated optoelectronics; Nonlinear optics; Optical materials; Photonics; Waveguides, Applications.; Experimental tests; Fabrication parameters; Fundamental wavelengths; Guided modes; Linear phenomenons; Material birefringences; Operation conditions; Operation wavelengths; Phase-matching; Physical characteristics; Room temperatures; Second harmonics; Second-harmonic generations, Optical waveguidesDOI: 10.1117/12.262443