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Optics Communications

The coherent effect of chirped femtosecond laser pulses on the formation of ultracold molecules in a magneto-optical trap

Benjamin L. Brown, Alexander J. Dicks, Ian A. Walmsley

Published Jun 16, 2006• 5 citations
Publisher
DOI
10.1016/j.optcom.2006.04.084

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Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text I. A. Walmsley, A. J. Dicks, B. L. Brown, D. McCabe, and A. Monmayrant, "The Effect of Chirped Femtosecond Laser Pulses on the Formation of Ultracold Molecules in a Magneto-Optical Trap," in Frontiers in Optics, OSA Technical Digest (CD) (Optica Publishing Group, 2006), paper LTuH3. Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article

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Coherent control with shaped femtosecond laser pulses applied to ultracold molecules

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We report on coherent control of excitation processes of translationally ultracold rubidium dimers in a magneto-optical trap by using shaped femtosecond laser pulses. Evolution strategies are applied in a feedback loop in order to optimize the photoexcitation of the ${\mathrm{Rb}}_{2}$ molecules, which subsequently undergo ionization or fragmentation. A superior performance of the resulting pulses compared to unshaped pulses of the same pulse energy is obtained by distributing the energy among specific spectral components. The demonstration of coherent control to ultracold ensembles opens a path to actively influence fundamental photoinduced processes in molecular quantum gases.

arXiv:physics/0509056•Physical Review A•Feb 14, 2006•87 citations
We have studied the effects of chirped femtosecond laser pulses on the formation of ultracold molecules in a Rb magneto-optical trap. We have found that application of chirped femtosecond pulses suppressed the formation of (85)Rb and (87)Rb(2) a(3)sigma(+)(u) molecules in contrast to comparable nonchirped pulses, cw illumination, and background formation rates. Variation of the amount of chirp indicated that this suppression is coherent in nature, suggesting that coherent control is likely to be useful for manipulating the dynamics of ultracold quantum molecular gases.
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text I. A. Walmsley, A. J. Dicks, B. L. Brown, D. McCabe, and A. Monmayrant, "The Effect of Chirped Femtosecond Laser Pulses on the Formation of Ultracold Molecules in a Magneto-Optical Trap," in Frontiers in Optics, OSA Technical Digest (CD) (Optica Publishing Group, 2006), paper LTuH3. Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article
We report on coherent control of excitation processes of translationally ultracold rubidium dimers in a magneto-optical trap by using shaped femtosecond laser pulses. Evolution strategies are applied in a feedback loop in order to optimize the photoexcitation of the Rb2{\mathrm{Rb}}_{2}Rb2​ molecules, which subsequently undergo ionization or fragmentation. A superior performance of the resulting pulses compared to unshaped pulses of the same pulse energy is obtained by distributing the energy among specific spectral components. The demonstration of coherent control to ultracold ensembles opens a path to actively influence fundamental photoinduced processes in molecular quantum gases.