We find strong self-defocusing in bacteriorhodopsin films in the near IR with powers in the tens of milliwatts. The defocused beam acquires a ring pattern because of spatial self-phase modulation. We also demonstrate efficient four-wave mixing with phase-conjugate reflectivities of 26%. We discuss the origin of this high nonlinearity.
© 1992 Optical Society of America
Original Manuscript: August 15, 1991
Published: February 15, 1992
Ofer Werner, Aaron Lewis, and Baruch Fischer, "Strong self-defocusing effect and four-wave mixing in bacteriorhodopsin films," Opt. Lett. 17, 241-243 (1992)