Fig. 7: Two examples of experimental optimized output spectra aiming to achieve flat spectral output in a selected interval with bandwidth Δλ = 200 nm.

a λt = 1300 nm, b λt = 1400 nm. The solid lines refer to the optimized spectra, and the dashed lines refer to the corresponding room temperature spectra. The light red area indicates the optimization interval. The insets show the measured temperature distributions provided by the sequence of Peltier elements.