Features of randomized electric-field assisted domain inversion in lithium tantalate

Abstract

Abstract:We report on bulk and guided-wave second-harmonic generation via random Quasi-Phase-Matching in Lithium Tantalate. By acquiring the far-field profiles at several wavelengths, we extract statistical information on the distribution of the quadratic nonlinearity as well as its average period, both at the surface and in the bulk of the sample. By investigating the distribution in the two regions we demonstrate a non-invasive approach to the study of poling dynamics. tuning and tolerances," IEEE J. Quantum Electron. 28(11), 2631-2654 (1992). 2. M. Yamada, N. Nada, M. Saitoh, and K. Watanabe, "First order quasi-phase matched LiNbO3 waveguide periodically poled by applying an external field for efficient blue second harmonic generation," Appl. ©2011 Optical Society of America

Parametric Conversion in Micrometer and Submicrometer Structured Ferroelectric Crystals by Surface Poling

“…The random modulation of the nonlinear coefficient allows phase matching between the fundamental (FF) and the SH beam thanks to the presence of several reciprocal lattice vectors (see Figure 1(b)), and, even far away from the QPM-SHG resonance, the harmonic signal remains remarkably large as compared to that generated in unpoled regions. While the SH output profile in space becomes strongly dependent on the wavelength (in the absence of effective self-focusing via cascading [37][38][39][40]), the randomized quasiphase matching (rQPM) process is quite broadband [41][42][43][44].…”

Nonlocal soliton scattering in random potentials

“…The interaction of self-confined wave-packets such as bright solitons with randomness is a fundamental aspect of their particle-like character [1]. In nonlinear optics, the interaction of coherent waves with randomness has raised quite some interest, particularly in parametric/harmonic generation, including the role of quadratic cascading [2][3][4][5][6]. In Kerr-like media with an intensity-dependent refractive index, in particular, nonlinear wave propagation in random dielectrics can be modelled by the nonlinear Schrödinger equation featuring a randomized photonic potential.…”