title: Diffraction from two-photon-excited thermal index gratings.
abstract: Two-photon absorption from crossed Gaussian laser beams creates a volume grating containing both a primary and a second-order sinusoidal index modulation. Unlike with linear excitation, the two-photon-induced grating exhibits two Bragg diffraction peaks having different decay rates. Comparison of diffracted orders from volume gratings allows the order of the excitation process to be determined.
authors.forename: D J
authors.initials: DJ
authors.lastname: McGraw
authors.forename: J M
authors.initials: JM
authors.lastname: Harris