dorsal/arxiv
View SchemaLasing and cooling in a hot cavity
| Authors | Thomas Salzburger Helmut Ritsch |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0603185 |
| URL | https://arxiv.org/abs/quant-ph/0603185 |
| DOI | 10.1103/PhysRevA.74.033806 |
Abstract
We present a microscopic laser model for many atoms coupled to a single cavity mode, including the light forces resulting from atom-field momentum exchange. Within a semiclassical description, we solve the equations for atomic motion and internal dynamics to obtain analytic expressions for the optical potential and friction force seen by each atom. When optical gain is maximum at frequencies where the light field extracts kinetic energy from the atomic motion, the dynamics combines optical lasing and motional cooling. From the corresponding momentum diffusion coefficient we predict sub-Doppler temperatures in the stationary state. This generalizes the theory of cavity enhanced laser cooling to active cavity systems. We identify the gain induced reduction of the effective resonator linewidth as key origin for the faster cooling and lower temperatures, which implys that a bad cavity with a gain medium can replace a high-Q cavity. In addition, this shows the importance of light forces for gas lasers in the low-temperature limit, where atoms can arrange in a periodic pattern maximizing gain and counteracting spatial hole burning. Ultimately, in the low temperature limit, such a setup should allow to combine optical lasing and atom lasing in single device.
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"abstract": "We present a microscopic laser model for many atoms coupled to a single\ncavity mode, including the light forces resulting from atom-field momentum\nexchange. Within a semiclassical description, we solve the equations for atomic\nmotion and internal dynamics to obtain analytic expressions for the optical\npotential and friction force seen by each atom. When optical gain is maximum at\nfrequencies where the light field extracts kinetic energy from the atomic\nmotion, the dynamics combines optical lasing and motional cooling. From the\ncorresponding momentum diffusion coefficient we predict sub-Doppler\ntemperatures in the stationary state. This generalizes the theory of cavity\nenhanced laser cooling to active cavity systems. We identify the gain induced\nreduction of the effective resonator linewidth as key origin for the faster\ncooling and lower temperatures, which implys that a bad cavity with a gain\nmedium can replace a high-Q cavity. In addition, this shows the importance of\nlight forces for gas lasers in the low-temperature limit, where atoms can\narrange in a periodic pattern maximizing gain and counteracting spatial hole\nburning. Ultimately, in the low temperature limit, such a setup should allow to\ncombine optical lasing and atom lasing in single device.",
"arxiv_id": "quant-ph/0603185",
"authors": [
"Thomas Salzburger Helmut Ritsch"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.74.033806",
"title": "Lasing and cooling in a hot cavity",
"url": "https://arxiv.org/abs/quant-ph/0603185"
},
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