The phase shifts experienced by a polarized light wave when it propagates through media
with arbitrary birefringence, dichroism and depolarizing properties, while on the one hand …

Quantum cascade lasers are compact, electrically pumped light sources in the
technologically important mid-infrared and terahertz region of the electromagnetic spectrum …

Exceptional points are singularities of open systems, and among their many remarkable
properties, they provide a way to enhance the responsivity of sensors. Here we show that …

Theory and experiments of single-mode ridge waveguide GaAs-AlGaAs semiconductor ring
lasers are presented. The lasers are found to operate bidirectionally up to twice the …

We report on fabrication and characterization of single-longitudinal-and transverse-mode
semiconductor ring lasers. A bifurcation from bidirectional stable operation to a regime with …

In rotating ring resonators, resonant frequencies are split because of the Sagnac effect. The
rotation sensitivity of the frequency splitting characterizes the sensitivity of resonator-based …

Ring quantum cascade lasers have recently gained considerable attention, showing
ultrastable frequency comb and soliton operation, thus opening a way to integrated …

A classical two-level system has been realized by coupling two propagation or two
polarization modes of an optical ring resonator. This system can be driven by periodic …

We consider a recursive algorithm to construct an aggregated estimator from a finite number
of base decision rules in the classification problem. The estimator approximately minimizes …

An equivalence is made between the exceptional points proposed by the field of non-
Hermitian quantum mechanics and the dead band observed in laser gyroscopes. The …