title: Thulium:ZBLAN blue fiber laser pumped by two wavelengths.
abstract: We demonstrate and analyze an upconversion blue fiber laser pumped by two wavelengths. Lasing at 0.48 mum with very low pump threshold power is obtained from a Tm-doped fluorozirconate fiber that is counterpropagating pumped by 1.21- and 0.649-mum light. We employed a rate-equation analysis using parameters obtained by fitting to the experimental data to predict the 0.48-mum output characteristics as a function of fiber length and output reflectivity.
authors.forename: G
authors.initials: G
authors.lastname: Tohmon
authors.forename: H
authors.initials: H
authors.lastname: Sato
authors.forename: J
authors.initials: J
authors.lastname: Ohya
authors.forename: T
authors.initials: T
authors.lastname: Uno