dorsal/arxiv
View SchemaQuenched Narrow-Line Laser Cooling of 40Ca to Near the Photon Recoil Limit
| Authors | E. A. Curtis, C. W. Oates, L. Hollberg |
|---|---|
| Categories | |
| ArXiv ID | physics/0104061 |
| URL | https://arxiv.org/abs/physics/0104061 |
| DOI | 10.1103/PhysRevA.64.031403 |
Abstract
We present a cooling method that should be generally applicable to atoms with narrow optical transitions. This technique uses velocity-selective pulses to drive atoms towards a zero-velocity dark state and then quenches the excited state to increase the cooling rate. We demonstrate this technique of quenched narrow-line cooling by reducing the 1-D temperature of a sample of neutral 40Ca atoms. We velocity select and cool with the 1S0(4s2) to 3P1(4s4p) 657 nm intercombination line and quench with the 3P1(4s4p) to 1S0(4s5s) intercombination line at 553 nm, which increases the cooling rate eight-fold. Limited only by available quenching laser power, we have transferred 18 % of the atoms from our initial 2 mK velocity distribution and achieved temperatures as low as 4 microK, corresponding to a vrms of 2.8 cm/s or 2 recoils at 657 nm. This cooling technique, which is closely related to Raman cooling, can be extended to three dimensions.
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"abstract": "We present a cooling method that should be generally applicable to atoms with\nnarrow optical transitions. This technique uses velocity-selective pulses to\ndrive atoms towards a zero-velocity dark state and then quenches the excited\nstate to increase the cooling rate. We demonstrate this technique of quenched\nnarrow-line cooling by reducing the 1-D temperature of a sample of neutral 40Ca\natoms. We velocity select and cool with the 1S0(4s2) to 3P1(4s4p) 657 nm\nintercombination line and quench with the 3P1(4s4p) to 1S0(4s5s)\nintercombination line at 553 nm, which increases the cooling rate eight-fold.\nLimited only by available quenching laser power, we have transferred 18 % of\nthe atoms from our initial 2 mK velocity distribution and achieved temperatures\nas low as 4 microK, corresponding to a vrms of 2.8 cm/s or 2 recoils at 657 nm.\nThis cooling technique, which is closely related to Raman cooling, can be\nextended to three dimensions.",
"arxiv_id": "physics/0104061",
"authors": [
"E. A. Curtis",
"C. W. Oates",
"L. Hollberg"
],
"categories": [
"physics.atom-ph"
],
"doi": "10.1103/PhysRevA.64.031403",
"title": "Quenched Narrow-Line Laser Cooling of 40Ca to Near the Photon Recoil Limit",
"url": "https://arxiv.org/abs/physics/0104061"
},
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