Distributed-feedback color center lasers in wide-band gap materials fabricated by a pair of chirped femtosecond pulses

摘要

A room-temperature-operated, pulsed distributed-feedback (DFB) LiF:F_2 color center laser was achieved. A distributed-feedback structure, based on non-erasable periodic gratings of laser-active color centers with fringe spacings as fine as ～510 nm, was fabricated by a pair of chirped near-IR femtosecond laser pulses. The DFB LiF:F_2 laser outputs at 710 nm were obtained with a linewidth of less than ～1 nm, the slope efficiency ～10% and beam divergence ～20 mrad.