“…Over the past few years the narrowband saturation data taken by Martin and Milam [18,23,25] and Yarema and Milam [17,24] has been modeled extensively, using the FrantzNodvik equation, corrected numerically to account for passive losses [17,18,25,26]. This modeling demonstrates that in the saturated regime E sat is not proportional to hν/σ, but to khν/σ, where k is a correction factor that depends upon the glass type, or in a more fundamental sense, upon the degree of inhomogeneous broadening of the fluorescence line of the glass.…”