Direct femtosecond laser writing of waveguides in As2S3 thin films
Abbreviated Journal Title
CHALCOGENIDE GLASSES; 2-PHOTON ABSORPTION; STRUCTURAL-CHANGES; PULSES; FABRICATION; GRATINGS; SILICA; Optics
Single-channel waveguides and Y couplers were fabricated in chatcogenide thin films by use of femtosecond laser pulses from a 25-MHz repetition rate Ti:sapphire laser. Refractive-index differentials (Deltan > 10(-2)) were measured through interferometrie microscopy and are higher than the typical values reported for oxide glasses. The dependence of the index differential on the peak intensity reveals the nonlinear nature of the photosensitivity in arsenic trisulfide below its bandgap energy, and the refractive-index change is correlated to the photoinduced structural changes inferred by Raman spectroscopy data. A free-electron model to predict the parametric dependence of An is proposed. (C) 2004 Optical Society of America.
"Direct femtosecond laser writing of waveguides in As2S3 thin films" (2004). Faculty Bibliography 2000s. 4927.