It is shown that a subharmonic grating may have two different phase relationships relative to the fundamental grating, leading to the appearance of domains. The subharmonic beam is generated in a Bi12GiO20 crystal illuminated by two beams in the presence of an applied ac square-wave voltage. The domain structure and the relative phases of the gratings contained in them have been observed with the aid of an interferometric technique.
© 1993 Optical Society of America
Original Manuscript: August 3, 1993
Published: December 15, 1993
A. Grunnet-Jepsen, S. J. Elston, I. Richter, J. Takacs, and L. Solymar, "Subharmonic domains in a bismuth germanate crystal," Opt. Lett. 18, 2147-2149 (1993)