title: Raman gain measurements and photo-induced transmission effects of germanium- and arsenic-based chalcogenide glasses.
abstract: The Raman gain spectra of millimeter thick As(2)S(3) and As(24)S(38)Se(38) glasses and Ge((23 - x))Ga(x)Sb(7)S((70 - y))Se(y) with x = 0 and 5 and y = 0, 2, 5 have been measured using a direct nonlinear optics technique. The pump light originated from a picosecond Nd:YAG laser operating at 1064 nm and a tunable optical parametric generator and amplifier (OPG/OPA) was used as a source for the probe light. A peak material Raman gain coefficient of (155 +/- 11) x 10(-13) m/W has been measured for the As(24)S(38)Se(38) glass. A reversible photodarkening effect which responds to picosecond pulses is also reported. Finally, surface optical damage threshold measurements were found to be less than 9 GW/cm(2) for the reported samples, values which are comparable to some TeO(2)-based glasses with lower nonlinearities.
authors.forename: Robert
authors.initials: R
authors.lastname: Stegeman
authors.forename: George
authors.initials: G
authors.lastname: Stegeman
authors.forename: Peter
authors.initials: P
authors.lastname: Delfyett
authors.forename: Laeticia
authors.initials: L
authors.lastname: Petit
authors.forename: Nathan
authors.initials: N
authors.lastname: Carlie
authors.forename: Kathleen
authors.initials: K
authors.lastname: Richardson
authors.forename: Michel
authors.initials: M
authors.lastname: Couzi