dorsal/arxiv
View SchemaChannelization architecture for wide-band slow light in atomic vapors
| Authors | Zachary Dutton, Mark Bashkansky, Michael Steiner, John Reintjes |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0510160 |
| URL | https://arxiv.org/abs/quant-ph/0510160 |
| DOI | 10.1117/12.601714 |
| Journal | SPIE Proceedings 5735, 115 (2005) |
Abstract
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.
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"abstract": "We propose a ``channelization\u0027\u0027 architecture to achieve wide-band\nelectromagnetically induced transparency (EIT) and ultra-slow light propagation\nin atomic Rb-87 vapors. EIT and slow light are achieved by shining a strong,\nresonant ``pump\u0027\u0027 laser on the atomic medium, which allows slow and\nunattenuated propagation of a weaker ``signal\u0027\u0027 beam, but only when a\ntwo-photon resonance condition is satisfied. Our wideband architecture is\naccomplished by dispersing a wideband signal spatially, transverse to the\npropagation direction, prior to entering the atomic cell. When particular\nZeeman sub-levels are used in the EIT system, then one can introduce a magnetic\nfield with a linear gradient such that the two-photon resonance condition is\nsatisfied for each individual frequency component. Because slow light is a\ngroup velocity effect, utilizing differential phase shifts across the spectrum\nof a light pulse, one must then introduce a slight mismatch from perfect\nresonance to induce a delay. We present a model which accounts for diffusion of\nthe atoms in the varying magnetic field as well as interaction with levels\noutside the ideal three-level system on which EIT is based. We find the maximum\ndelay-bandwidth product decreases with bandwidth, and that delay-bandwidth\nproduct ~1 should be achievable with bandwidth ~50 MHz (~5 ns delay). This is a\nlarge improvement over the ~1 MHz bandwidths in conventional slow light systems\nand could be of use in signal processing applications.",
"arxiv_id": "quant-ph/0510160",
"authors": [
"Zachary Dutton",
"Mark Bashkansky",
"Michael Steiner",
"John Reintjes"
],
"categories": [
"quant-ph"
],
"doi": "10.1117/12.601714",
"journal_ref": "SPIE Proceedings 5735, 115 (2005)",
"title": "Channelization architecture for wide-band slow light in atomic vapors",
"url": "https://arxiv.org/abs/quant-ph/0510160"
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