dorsal/arxiv
View SchemaSub-natural linewidth in room-temperature Rb vapor using a control laser
| Authors | Umakant D. Rapol, Ajay Wasan, Vasant Natarajan |
|---|---|
| Categories | |
| ArXiv ID | physics/0204023 |
| URL | https://arxiv.org/abs/physics/0204023 |
| DOI | 10.1103/PhysRevA.67.053802 |
| Journal | Physical Review A 67, 053802 (2003) |
Abstract
We demonstrate two ways of obtaining sub-natural linewidth for probe absorption through room-temperature Rb vapor. Both techniques use a control laser that drives the transition from a different ground state. The coherent drive splits the excited state into two dressed states (Autler-Townes doublet), which have asymmetric linewidths when the control laser is detuned from resonance. In the first technique, the laser has a large detuning of 1.18 GHz to reduce the linewidth to 5.1 MHz from the Doppler width of 560 MHz. In the second technique, we use a counter-propagating pump beam to eliminate the first-order Doppler effect. The unperturbed probe linewidth is about 13 MHz, which is reduced below 3 MHz (0.5 \Gamma) at a detuning of 11.5 MHz.
{
"annotation_id": "198a7446-69f0-4283-be1a-02e02ad3b091",
"date_created": "2026-03-02T18:00:39.826000Z",
"date_modified": "2026-03-02T18:00:39.826000Z",
"file_hash": "3821b19370c26260dd0791d8196a75a56abab193e8e79c3808dfd9ef31b2eec0",
"private": false,
"record": {
"abstract": "We demonstrate two ways of obtaining sub-natural linewidth for probe\nabsorption through room-temperature Rb vapor. Both techniques use a control\nlaser that drives the transition from a different ground state. The coherent\ndrive splits the excited state into two dressed states (Autler-Townes doublet),\nwhich have asymmetric linewidths when the control laser is detuned from\nresonance. In the first technique, the laser has a large detuning of 1.18 GHz\nto reduce the linewidth to 5.1 MHz from the Doppler width of 560 MHz. In the\nsecond technique, we use a counter-propagating pump beam to eliminate the\nfirst-order Doppler effect. The unperturbed probe linewidth is about 13 MHz,\nwhich is reduced below 3 MHz (0.5 \\Gamma) at a detuning of 11.5 MHz.",
"arxiv_id": "physics/0204023",
"authors": [
"Umakant D. Rapol",
"Ajay Wasan",
"Vasant Natarajan"
],
"categories": [
"physics.atom-ph",
"physics.optics"
],
"doi": "10.1103/PhysRevA.67.053802",
"journal_ref": "Physical Review A 67, 053802 (2003)",
"title": "Sub-natural linewidth in room-temperature Rb vapor using a control laser",
"url": "https://arxiv.org/abs/physics/0204023"
},
"schema_id": "dorsal/arxiv",
"source": {
"execution_id": "33c65f84-a8b5-4802-b596-d2a1c639e724",
"id": "arXiv Dataset IDs",
"type": "Model",
"variant": "snapshot-2026-03-01",
"version": "0.1.0"
},
"user_id": 1000002
}