. "BF00306224" . . . . . . "Experimental determination of exponential parameters for multiphonon residual absorption in a ZBLAN: Er3+ fibre"@en . "Abstract. Determination of exponential parameters for both Stokes and anti-Stokes sidebands by excitation of a ZBLAN: Er3+ fibre and bulk samples gives values of 9.4\u00D710-3 cm and 14.1\u00D710-3 cm, respectively. Observed values are larger than equivalent parameters usually found for nonradiative transitions. As examples, the measured parameters are used to determine the multiphonon sideband absorption between the 4I11/2 and the 4I13/2 electronic transitions of Er3+ and also between 1G4 and 3F4 of Pr3+. Available energy ranges for sideband pumping of distributed amplifiers are given as well as the minimum multiphonon background losses intrinsic to the rare-earth plus pure glass base combination."@en . . "1994" . . . . . . .