Applications of Wide-Band-Gap Materials for Optoelectronic Functional Devices Fabricated by a Pair of Interfering Femtosecond Laser Pulses

摘要

A pair of interfering near-IR femtosecond pulses from a mode-locked Ti: sapphire laser with a regenerative amplifier have been applied to wide-band-gap materials such a lithium fluoride (LiF) to create laser-active F_2 and F_3~+ color centers and to encode nonerasable periodic gratings with fine fringe spacings of submicrometer size simultaneously. Using such a photon-written microstructure, a distributed-feedback LiF laser oscillation based on F_2 color centers has been realized at room temperature. A lasing output performance with a linewidth of less than 1 nm, slope efficiency of ～10%, and beam divergence of ～20mrad was obtained at 710nm.