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Sculpting harmonic comb states in terahertz quantum cascade lasers by controlled engineering
Elisa Riccardi, M. Alejandro Justo Guerrero, Valentino Pistore +6
Optical frequency combs (FCs), that establish a rigid phase-coherent link between the microwave and optical domains of the electromagnetic spectrum, are emerging as a key high-prec…
Ultrashort pulse generation from a graphene-coupled passively mode-locked terahertz laser
Elisa Riccardi, Valentino Pistore, Seonggil Kang +10
The generation of stable trains of ultra-short (fs-ps), terahertz (THz)-frequency radiation pulses, with large instantaneous intensities, is an underpinning requirement for the inv…
Chip-scale terahertz frequency combs through integrated intersubband polariton bleaching
Francesco P. Mezzapesa, Leonardo Viti, Lianhe Li +5
Quantum cascade lasers (QCLs) represent a fascinating accomplishment of quantum engineering and enable the direct generation of terahertz (THz) frequency radiation from an electric…
Homogeneous quantum cascade lasers operating as Terahertz frequency combs over their entire operational regime
Alessandra Di Gaspare, Leonardo Viti, Harvey E. Beere +2
We report a homogeneous quantum cascade laser (QCL) emitting at Terahertz (THz) frequencies, with a total spectral emission of about 0.6 THz centered around 3.3 THz, a current dens…
Quantum Cascade Laser Based Hybrid Dual Comb Spectrometer
Luigi Consolino, Malik Nafa, Michele De Regis +9
Four-wave-mixing-based quantum cascade laser frequency combs (QCL-FC) are a powerful photonic tool, driving a recent revolution in major molecular fingerprint regions, i.e. mid- an…
Ultrafast two-dimensional field spectroscopy of terahertz intersubband saturable absorbers
Jürgen Raab, Christoph Lange, Jessica L. Boland +9
Intersubband (ISB) transitions in semiconductor multi-quantum well (MQW) structures are promising candidates for the development of saturable absorbers at terahertz (THz) frequenci…
Bow-Tie Cavity for Terahertz Radiation
Luigi Consolino, Annamaria Campa, Davide Mazzotti +3
We report on the development, testing, and performance analysis of a bow-tie resonant cavity for terahertz (THz) radiation, injected with a continuous-wave 2.55 THz quantum cascade…
Phase-sensitive terahertz imaging using room-temperature near-field nanodetectors
Maria C. Giordano, Leonardo Viti, Oleg Mitrofanov +1
Imaging applications in the terahertz (THz) frequency range are severely restricted by diffraction. Near-field scanning probe microscopy is commonly employed to enable mapping of t…
Fully phase-stabilized quantum cascade laser frequency comb
Luigi Consolino, Malik Nafa, Francesco Cappelli +8
Optical frequency comb synthesizers (FCs) [1] are laser sources covering a broad spectral range with a number of discrete, equally spaced and highly coherent frequency components,…
Distributed feedback terahertz frequency quantum cascade lasers with dual periodicity gratings
F. Castellano, S. Zanotto, L. H. Li +5
We have developed terahertz frequency quantum cascade lasers that exploit a double-periodicity distributed feedback grating to control the emission frequency and the output beam di…