Control of Raman Lasing in the Nonimpulsive Regime

Phase-locked bi-frequency Raman lasing in a double-$Λ$ system

We show that it is possible to realize simultaneous Raman lasing at two different frequencies using a double-$Λ$ system pumped by a bi-frequency field. The Raman lasers are phase-locked to one another, and the beat-frequency matches the energy difference between the two meta-stable ground states. Akin to a conventional Raman laser, the phase-locked Raman laser pair is expected to be subluminal. As such, it is expected to be highly stable against perturbations in cavity length, and have a quantum noise limited linewidth that is far below that of a conventional laser. Because of these properties…

Correlated steady states and Raman lasing in continuously pumped and probed atomic ensembles

Spin-polarised atomic ensembles probed by light based on the Faraday interaction are a versatile platform for numerous applications in quantum metrology and quantum information processing. Here we consider an ensemble of Alkali atoms that are continuously optically pumped and probed. Due to the collective scattering of photons at large optical depth, the steady state of atoms does not correspond to an uncorrelated tensor-product state, as is usually assumed. We introduce a self-consistent method to approximate the steady state including the pair correlations, taking into account the multilevel…

Lasing without inversion in a closed four-level system

We show lasing without population inversion in a closed four-level atomic system which is no longer incoherently pumped on the transition at which lasing occurs. The four-level system can overcome some limits in the typical lambda-type and V-type three-level systems, furthermore it is possible to achieve lasing even in the absence of the inversion condition for the thermal radiation fields or of the inversion of spontaneous decay rate. We find that when the detuning of probe field is equal to that of coherent coupling field, there is a peak value along with the increase of the detuning. To exp…

非简谐区域下的分子光力学：从非经典力学态到力学激射

Molecular optomechanics in the anharmonic regime: from nonclassical mechanical states to mechanical lasing

本文提出利用分子振动的强内禀非简谐性，通过力学阻塞非相干类比制备非经典力学态，并揭示其对强驱动下力学放大的抑制与相干振荡起始的重塑，为表面增强拉曼散射中实现分子相干与非经典效应开辟途径。