title: Efficient holmium-doped fluoride fiber laser emitting 2.1 µm and blue upconversion fluorescence upon excitation at 2 µm.
authors.affiliation: Institut d'Optique Graduate School, Campus Polytechnique-RD 128, Palaiseau, France.
authors.forename: A
authors.initials: A
authors.lastname: Guhur
authors.forename: S D
authors.initials: SD
authors.lastname: Jackson