The coherent effect of chirped femtosecond laser pulses on the formation of ultracold molecules in a magneto-optical trap |
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Authors: | Benjamin L. Brown Alexander J. Dicks Ian A. Walmsley |
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Affiliation: | a Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom b The Institute of Optics, University of Rochester, Rochester, NY 14627, USA |
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Abstract: | We have investigated how the formation of ultracold molecules in a rubidium magneto-optical trap is affected by the application of positively-chirped femtosecond laser pulses. The application of femtosecond pulses resulted in a reduction, rather than an increase, in the rate of detection of 85Rb2 and 87Rb2 triplet ground-state molecules, and compared this to the effects of non-chirped pulses, continuous-wave light, and the formation rate when no additional light was applied. A dependence on the amount of chirp of the femtosecond laser pulses suggests that the reduction in the molecular signal is the result of a coherent effect, and provides a promising indication that coherent control could be used to engineer the production of ultracold molecules. |
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Keywords: | 32.80.Qk 33.80&minus b 82.53.&minus k 34.50.Rk |
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