期刊
PHYSICAL REVIEW LETTERS
卷 115, 期 17, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.173003
关键词
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资金
- U.S. Department of Energy Office of Science, Office of Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division [DE-FG02-92ER14263]
- US-Israel Binational Science Foundation [2012021]
- U.S. Department of Energy (DOE) [DE-FG02-92ER14263] Funding Source: U.S. Department of Energy (DOE)
We demonstrate that judicious shaping of a nanosecond-time-scale frequency chirp can dramatically enhance the formation rate of ultracold Rb-87(2) molecules. Starting with ultracold Rb-87 atoms, we apply pulses of frequency-chirped light to first photoassociate the atoms into excited molecules and then, later in the chirp, deexcite these molecules into a high vibrational level of the lowest triplet state a (3)Sigma(+)(u). The enhancing chirp shape passes through the absorption and stimulated emission transitions relatively slowly, thus increasing their adiabaticity, but jumps quickly between them to minimize the effects of spontaneous emission. Comparisons with quantum simulations for various chirp shapes support this enhancement mechanism.
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