Watt-level Er-doped and Er-Pr-codoped ZBLAN fiber amplifiers at the 2.7-2.8 μm wavelength range Zhu, Xiushan ; Jain, Ravi Abstract Publication: Optics Letters Pub Date: July 2008 DOI: 10.1364/OL.33.001578 Bibcode: 2008OptL...33.1578Z