Diffractive optics are applied to six-wave mixing processes to provide a single optic approach to attaining the required, relatively complex, phase-matching geometry to discriminate against lower-order nonlinear responses. The diffractive optics were designed specifically for broad-bandwidth operation and passive phase locking of the appropriate pulse pairs for use in femtosecond two-dimensional Raman studies of the dynamic structure of liquids. The fifth-order signal was studied in liquid CS>2; two different colors were used for the excitation and the probe to reduce background scatter, as were two different phase-matching geometries with different degrees of suppression of cascaded third-order processes.
© 2000 Optical Society of America
V. Astinov, K. J. Kubarych, C. J. Milne, and R. J. Dwayne Miller, "Diffractive optics implementation of six-wave mixing," Opt. Lett. 25, 853-855 (2000)