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Intermediate state absorption enhancement in resonance-mediated (2+1) three-photon excitation process

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Abstract

In this paper, we theoretically study the control of intermediate state absorption in resonance-mediated (2+1) three-photon excitation process by shaping the femtosecond pulse with a π phase step modulation under weak laser field. Our results show that the intermediate state absorption can be enhanced, and the coherent enhancement increases with the increase of the pulse intensity and pulse duration. Our analysis indicates that the absorption enhancement results from the absorption reduction of the final state from the intermediate state in the shaped laser field. Furthermore, the effects of the population difference of the final and intermediate states in the unshaped laser field and the transition dipole moment from the intermediate state to the final state on the absorption enhancement are discussed and analyzed.

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Acknowledgments

This work was partly supported by Ministry of Education of China (30800), National Natural Science Fund (Grants No. 11004060, 11027403 and 51132004), Shanghai Rising-Star Program (No. 12QA1400900) and Shanghai Municipal Science and Technology Commission (Grants No. 10XD1401800, 09142200501, 09JC1404700 and 10JC1404500).

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Authors and Affiliations

  1. State Key Laboratory of Precision Spectroscopy and Department of Physics, East China Normal University, 3663 North Zhongshan Road, Shanghai, 200062, People’s Republic of China

    S. Zhang, C. Lu, T. Jia & Z. Sun

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  1. S. Zhang
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  2. C. Lu
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  3. T. Jia
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  4. Z. Sun
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Correspondence to Z. Sun.

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Zhang, S., Lu, C., Jia, T. et al. Intermediate state absorption enhancement in resonance-mediated (2+1) three-photon excitation process. Indian J Phys 86, 1043–1047 (2012). https://doi.org/10.1007/s12648-012-0185-0

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  • DOI: https://doi.org/10.1007/s12648-012-0185-0

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