Broadband On-Chip Thz Frequency Combs

Recently, on-chip quantum-cascade-Iaser-based frequency combs are gaining increasing attention both in the Mid-IR and in the THz spectral regions. THz devices offer the possibility of filling the gap of comb sources in a spectral region were no table top comb is available. We will report on recent progresses including broadband (>1 THz) comb generation, dual color comb source operating as combs and spaced by exactly one octave in frequency and new homogenous laser design with ultra broad bandwidth.