In research and engineering, short laser pulses are fundamental for metrology and
communication. The generation of pulses by passive mode-locking is especially desirable …

It is believed that passive mode locking is virtually impossible in quantum cascade lasers
(QCLs) because of too fast carrier relaxation time. Here, we revisit this possibility and …

We present a study concerning the dynamics of dense and harmonic coherent regimes in
quantum cascade lasers (QCLs) in a Fabry–Perot configuration emitting in the terahertz …

Mode-locking operation and multimode instabilities in Terahertz (THz) quantum cascade
lasers (QCLs) have been intensively investigated during the last decade. These studies …

We present a numerical study of the active harmonic mode locking (HML) of quantum
cascade lasers (QCLs) in the terahertz (THz) spectral range. This is a recently …

A significant research effort toward the generation of short terahertz (THz) pulses using
quantum cascade lasers (QCLs) has been undertaken over the past few years. This is …

We provide an experimental evidence of transient instabilities (TIs) in a terahertz (THz)
quantum cascade laser (QCL) under optical feedback, in contrast to the widely accepted …

The gain recovery time of a heterogeneous active region terahertz quantum cascade laser is
studied by terahertz-pump-terahertz-probe spectroscopy. The investigated active region …

Quantum cascade lasers (QCLs) represent the most fascinating achievement of quantum
engineering, showing how artificial materials can be generated through quantum design …

Terahertz quantum cascade lasers are compact, electrically pumped semiconductor laser
sources that are capable of delivering tens of milliwatts of power in continuous wave. Here …