Optical parametric oscillation with distributed feedback in cold atoms

Abstract

There is currently a strong interest in mirrorless lasing systems, in which the electromagnetic feedback is provided either by disorder (multiple scattering in the gain medium) or by order (multiple Bragg reflection). These mechanisms correspond, respectively, to random lasers and photonic crystal lasers. The crossover regime between order and disorder, or correlated disorder, has also been investigated with some success. Here, we report one-dimensional photonic-crystal lasing (that is, distributed feedback lasing) with a cold atom cloud that simultaneously provides both gain and feedback. The atoms are trapped in a one-dimensional lattice, producing a density modulation that creates a strong Bragg reflection with a small angle of incidence. Pumping the atoms with auxiliary beams induces four-wave mixing, which provides parametric gain. The combination of both ingredients generates a mirrorless parametric oscillation with a conical output emission, the apex angle of which is tunable with the lattice periodicity.

References in corpus (5)

• Dynamic light diffusion, Anderson localization and lasing in disordered inverted opals: 3D ab-initio Maxwell-Bloch computation
• Photonic Band Gaps in One-Dimensionally Ordered Cold Atomic Vapors
• Coherent 455nm beam production in cesium vapor
• Mechanisms for Lasing with Cold Atoms as the Gain Medium
• Fano-Hopfield model and photonic band gaps for an arbitrary atomic lattice

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• Bond Order via Light-Induced Synthetic Many-body Interactions of Ultracold Atoms in Optical Lattices
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• Temporal dynamics in the Bragg reflection of light by cold atoms: flash effect and superradiant decay