We demonstrate a new method of detecting the presence of ferroelectric domains based on non-phase-matched second-harmonic generation. If a domain boundary is tilted relative to the input and output faces of the crystal, the far-field second-harmonic light consists of multiple beams, in contrast to the single beam generated in a single-domain crystal. The angular separation of the beams provides a measure of the tilt of the domain wall if the refractive-index difference n2ω − nω is known.
© 1998 Optical Society of America
(160.4330) Materials : Nonlinear optical materials
(190.0190) Nonlinear optics : Nonlinear optics
(190.1900) Nonlinear optics : Diagnostic applications of nonlinear optics
(190.4400) Nonlinear optics : Nonlinear optics, materials
Russell J. Gehr, W. J. Alford, and A. V. Smith, "Simple Method of Detecting Ferroelectric Domains with Non-Phase-Matched Second-Harmonic Generation," Appl. Opt. 37, 3311-3317 (1998)