title: Characterization of a Ho(3+)-doped fluoride fiber laser with a 3.9-mum emission wavelength.
abstract: The fluoride fiber laser with the longest emission wavelength, the Ho(3+)-transition at 3.9 mum in the attenuation minimum of the 3-5-mum atmospheric window, is characterized. After reviewing the importance of fluoride fibers due to their low phonon energies, we describe room-temperature fluorescence and laser action with liquid-nitrogen cooling. Continuous-wave laser action at 3.9 mum is presented for the 640- and the 890-nm pump ranges. A shift of the emission wavelength is achieved by varying the resonator mirrors. Laser characteristics and temperature dependence are discussed.
authors.forename: J
authors.initials: J
authors.lastname: Schneider
authors.forename: C
authors.initials: C
authors.lastname: Carbonnier
authors.forename: U B
authors.initials: UB
authors.lastname: Unrau