title: Mode-locked operation of Cr⁴⁺:YAG single-crystal fiber laser with external cavity.
abstract: We report what is to our knowledge the first mode-locked Cr⁴⁺:YAG single-crystal fiber laser, which generates pulses of 120-fs duration with an output power of 23 mW at a center wavelength of 1520 nm for a single pulse in a cavity-round-trip. The laser contains a single-crystal fiber multi-mode waveguide about 120 μm in diameter and 40-mm long. The fundamental transverse mode is selected with an external cavity. This design strategy turned out to be well suited for direct high-power-laser-diode pumping.
authors.forename: Shigeo
authors.initials: S
authors.lastname: Ishibashi
authors.forename: Kazunori
authors.initials: K
authors.lastname: Naganuma