Channelization architecture for wide-band slow light in atomic vapors

We propose a ``channelization'' architecture to achieve wide-band electromagnetically induced transparency (EIT) and ultra-slow light propagation in atomic Rb-87 vapors. EIT and slow light are achieved by shining a strong, resonant ``pump'' laser on the atomic medium, which allows slow and unattenuated propagation of a weaker ``signal'' beam, but only when a two-photon resonance condition is satisfied. Our wideband architecture is accomplished by dispersing a wideband signal spatially, transverse to the propagation direction, prior to entering the atomic cell. When particular Zeeman sub-levels are used in the EIT system, then one can introduce a magnetic field with a linear gradient such that the two-photon resonance condition is satisfied for each individual frequency component. Because slow light is a group velocity effect, utilizing differential phase shifts across the spectrum of a light pulse, one must then introduce a slight mismatch from perfect resonance to induce a delay. We present a model which accounts for diffusion of the atoms in the varying magnetic field as well as interaction with levels outside the ideal three-level system on which EIT is based. We find the maximum delay-bandwidth product decreases with bandwidth, and that delay-bandwidth product ~1 should be achievable with bandwidth ~50 MHz (~5 ns delay). This is a large improvement over the ~1 MHz bandwidths in conventional slow light systems and could be of use in signal processing applications.Comment: Published in SPIE Proceedings, Photonics West 2005 (San Jose, CA, Jan. 22-27, 2005

COVID-19 pandemic waves surveillance in another severe winter of 2021: a basic guide to understand epidemic contexts, interpret pandemic waves and trends, ahead of the curve: how can we understand and interpret alert signals from pandemic waves considering pitfalls and stay ahead of the virus?

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ASPHER statement: planning for winter 2022-23

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Communication Research

Contains reports on five research projects.Rand Corporatio

ASPHER Statement: Facing the Fourth Winter of the COVID-19 Pandemic

From Frontiers via Jisc Publications RouterHistory: collection 2022, received 2022-09-14, accepted 2022-09-20, epub 2022-10-03Peer reviewed: TruePublication status: Publishe

ASPHER Statement: Planning for Winter 2022-23

From Frontiers via Jisc Publications RouterHistory: collection 2022, received 2022-09-14, accepted 2022-09-20, epub 2022-10-03Peer reviewed: TrueAcknowledgements: Thanks to Catarina Hermenegildo, Catolica University, Lisbon, Portugal.Publication status: Publishe

Communication Research

Contains reports on six research projects.Rand Corporatio

Nonlinear optical parametric processes in liquids and gases

Nonlinear Optical Parametric Processes in Liquids and Gase

Food and feeding habits of the yellowfin tuna Neothunnus macropterus in relation to its distribution in the central Pacific region

Typescript.Literature cited: leaves 62-69.vi, 69 leaves graphs, mapFood and feeding habits of the yellowfin tuna Neothunnus macropterus in relation to its distribution in the central Pacific region. Examination of length, frequency distribution, of all yellowfin measured from various fishing methods. Examines stomach contents, stomach size, prey and predator habitat variation