Efficient supercontinuum generation in a filter-less cascade of silica, fluoride, and chalcogenide fibers

We present an efficient supercontinuum generation spanning in the wavelength range of 1.7-4.5 µm in a passive and filter-less cascade of silica, ZBLAN, and Ge
10
As
22
Se
68
fibers. The supercontinuum is obtained with an energy conversion efficiency of ~17% and pulse energy of ~1.7 nJ.