Vitaly V. Kocharovsky

TL;DR: In this article, the authors formulate the general requirements, set by classical electrodynamics, on the sources of extremely high-energy cosmic rays (EHECRs), and show that the parameters of EHECR accelerators are strongly limited not only by the particle confinement in large-scale magnetic fields or by the difference in electric potentials (generalized Hillas criterion) but also by the synchrotron radiation, the electro-bremsstrahlung, or the curvature radiation of accelerated particles.

TL;DR: When ground-state atoms are accelerated through a high Q microwave cavity, radiation is produced with an intensity which can exceed the intensity of Unruh acceleration radiation in free space by many orders of magnitude.

TL;DR: An efficient intracavity nonlinear interaction of laser modes in a specially adapted quantum cascade laser that resonantly enhanced sum-frequency and second-harmonic generation at wavelengths of 4.1, 3.6, and 4.7 micrometer respectively is demonstrated.

TL;DR: In this paper, a scheme for infrared generation without population inversion between subbands in quantum-well and quantum-dot lasers is presented based on the resonant nonlinear mixing of the optical laser fields on the two interband transitions that are generated in the same active region and that serve as the coherent drive for the infrared field.

TL;DR: In this paper, the authors consider a gedanken experiment with a beam of atoms in their ground state that are accelerated through a single-mode cavity and show that taking into account of the counterrotating terms in the interaction Hamiltonian leads to the excitation of an atom with simultaneous emission of a photon into a field mode.