It has been shown that ring quantum cascade lasers can emit solitons when the driving current is large enough such that spontaneous symmetry breaking occurs between the clockwise and counter-clockwise modes . We show that ring devices with very low backscattering will emit an optical frequency comb when injected with RF close to the round trip frequency. This result is interpreted as a new form of active mode-locking with a fast saturable gain. The transient behavior of the device is studied by time resolved spectroscopy.
Photonic Time Crystals (PTCs) are dielectric media whose refractive index is modulated periodically in time at time scales of an optical cycle. These systems conserve momentum but not energy, and are characterized by momentum bands and bandgaps, where the amplitudes of their eigenmodes can increase (or decrease) exponentially. But more interesting than all the rest - I will discuss the classical and quantum features of light emission in PTCs from various radiation sources, such as free electrons, classical dipoles, quantum fluctuations, and the emission by atoms. The latter opens new avenues for making widely tunable lasers that extract energy from the temporal modulation of the medium.
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