Optical bistability in sideband output modes induced by a squeezed vacuum (original) (raw)

Optical bistability in V-type atoms driven by a coherent field in a broadband squeezed vacuum

Physics Letters A, 2003

We study the optical bistability (OB) induced in a coherently-driven V -type three-level atom, when the cancellation of the spontaneous emission produced by quantum interference in the two possible decay channels to the ground sublevel takes place. In addition the atoms interact with a beam in a broadband squeezed vacuum state. New features are found in this situation. In particular, vacuum-induced optical bistability (VIOB) may be controlled by the amplitude of the squeezed vacuum or its phase relative to the phase of the external field.

Optical bistability using quantum interference in V -type atoms

Journal of Optics B: Quantum and Semiclassical Optics, 2002

The behaviour of a V -type three-level atomic system in a ring cavity driven by a coherent field is studied. We consider a V configuration under conditions such that interference between decay channels is important. We find that when quantum interference is taken into account, optical bistability can be realized with a considerable decrease in the threshold intensity and the cooperative parameter. On the other hand, we also include the finite bandwidth of the driving field and study its role in the optical bistable response. It is found that at certain linewidths of the driving field optical bistability is obtained even if the system satisfies the trapping condition and the threshold intensity can be controlled. Furthermore, a change from the optical bistability due to quantum interference to the usual bistable behaviour based on saturation occurs as the driving field linewidth increases.

Dispersive optical bistability in a ring cavity

Optics Communications, 1978

Equations governing the behaviour of a single mode high-Q ring cavity are obtained for a coherent driving field (detuned to both cavity and atoms) and inhomogeneously broadened atomic transitions using a Hamiltonian approach. We find the region of bistability and critical points in the homogeneous broadening case. Numerical results including inhomogeneous broadening show that bistability is obtained more readily by detuning both the atomic transition and the cavity mode relative to the driving field.

Optical bistability via quantum interference from incoherent pumping and spontaneous emission

Journal of Luminescence, 2011

We theoretically investigate the optical bistability (OB) in a V-type three-level atomic system confined in a unidirectional ring cavity via incoherent pumping field. It is shown that the threshold of optical bistability can be controlled by the rate of an incoherent pumping field and by interference mechanism arising from the spontaneous emission and incoherent pumping field. We demonstrate that the optical bistability converts to optical multi-stability (OM) by the quantum interference mechanism.

Effect of quantum interference on optical bistability in the three-level V-type atomic system

Physical Review A, 2003

The phenomenon of optical bistability is studied for the three-level atomic system in V-configuration confined in a unidirectional optical ring cavity, and the effects of quantum interference and coupling field are investigated. The possibility of obtaining optical multistability in the system by controlling quantum interference and coupling field strength is also discussed.

Controlling optical bistability in a three-level atomic system

Physical Review A, 2003

We have experimentally studied the optical bistable behavior in an optical ring cavity filled with a collection of three-level ⌳-type rubidium atoms, interacting with two collinearly propagating laser beams. The bistability so observed is very sensitive to the induced atomic coherence in this electromagnetically induced transparency system or consequently to the altered nonlinearity in the system and, thus, can easily be controlled by changing the intensity and the frequency detuning of the coupling field.

Negative and positive hysteresis in double-cavity optical bistability in a three-level atom

Phys Rev a, 2011

We present novel hysteretic behaviour of a three-level ladder atomic system exhibiting doublecavity optical bistability in the mean-field limit. The two fields coupling the atomic system experience feedback via two independent, unidirectional, single mode ring cavities and exhibit cooperative phenomena, simultaneously. The system displays a range of rich dynamical features varying from normal switching to self pulsing and a period-doubling route to chaos for both the fields. We focus our attention to a new hump like feature in the bistable curve arising purely due to cavity induced inversion, which eventually leads to negative hysteresis in the bistable response. This is probably the only all-optical bistable system that exhibits positive as well as negative bistable hysteresis in different input field intensity regimes. For both the fields, the switching times, the associated critical slowing down, the self-pulsing characteristics, and the chaotic behaviour can be controlled to a fair degree, moreover, all these effects occur at low input light levels.

The atom-cavity system as a generator of quadrature squeezed states

Applied Physics B Photophysics and Laser Chemistry, 1992

This paper describes experiments with a coupled atom-cavity system generating quadrature squeezed states of light. A wide range of parameters was explored and a regime was found where a beam of laser light with significant power (0.17 mW) and good noise suppression (measured 18-4-3%, inferred 50 + 10%) was observed. An analysis of the exact phase of the noise suppression shows it to be a minimum uncertainty state with reduced noise in a combined amplitude/phase quadrature. The observations are in good qualitative agreement with a full quantum theory of squeezing in optical bistability.