| Influence of atomic densities on propagation property for ultrashort pulses in a two-level medium |
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| 作者姓名： | 刘炳欣 龚尚庆 宋晓红 金石琦 |
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| 作者单位： | State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Shanghai 201800，State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Shanghai 201800，State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Shanghai 201800，State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Shanghai 201800 |
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| 基金项目： | The work was supported by the National Natural Science Foundation of China (No. 60478002) and the Natural Science Key Foundation of Shanghai (No. 04JC14036). |
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| 摘 要： | The influence of atomic densities on the propagation property for ultrashort pulses in a two-level atom (TLA) medium is investigated. With higher atomic densities, the self-induced transparency (SIT) cannot be recovered even for 2πultrashort pulses. New features such as pulse splitting, red-shift and blue-shift of the corresponding spectra arise, and the component of central frequency gradually disappears.
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