title: High repetition rate UV ultrafast laser inscription of buried channel waveguides in Sapphire: fabrication and fluorescence imaging via ruby R lines.
abstract: We report on the fabrication of buried cannel waveguides in Sapphire crystals by 250-kHz high repetition rate ultrafast laser inscription with 385 nm pulses. The propagation properties of the waveguides were studied as a function of the writing conditions. The micro-fluorescence analysis of the R lines generated by trace Cr(3+) dopant in Sapphire is used to elucidate the micro-structural modifications induced in the crystal network. It is revealed that waveguide has been formed due to local dilatation of the Sapphire network generated in the surroundings of the focal volume. The refractive index increment due to the dilatation induced electronic polarizability enhancement has been estimated to be of the order of Deltan approximately 10(-4).
authors.affiliation: Departamento de Física de Materiales C-IV, Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid, Spain. antonio.benayas@uam.es
authors.forename: Antonio
authors.initials: A
authors.lastname: Benayas
authors.forename: Daniel
authors.initials: D
authors.lastname: Jaque
authors.forename: Ben
authors.initials: B
authors.lastname: McMillen
authors.forename: Kevin P
authors.initials: KP
authors.lastname: Chen
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry* / Q000528:radiation effects*; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007834:Lasers; D008856:Microscopy, Fluorescence / Q000379:methods*; D055096:Optical Devices; D012031:Refractometry / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013499:Surface Properties; D014466:Ultraviolet Rays
chemical_list: D000537:Aluminum Oxide