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European Quantum Electronics Conference (EQEC)

Propagation of Delayed Laser Pulses in Three-Level Medium

Vasily G. Arkhipkin, Д. В. Манушкин, V. P. Timofeev

Published Aug 24, 2005• 0 citations
Publisher
DOI
10.1109/eqec.1998.715046

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The medium of the three-level Yb atom corresponding to the three-colour, three-step, three-photon scheme of 6 1 S 0 (0 cm -1 ) to 6 3 P 1 (17992008 cm -1 ) to (7/2, 3/2) 2 4f 13 6s 2 6p (35196.98 cm -1 ) to autoionization state (52353 cm -1 ) is chosen to examine the selective photoionization of 168 Yb. The Maxwell-Bloch equation is numerically solved, where the interacting laser pulses are supposed to be collinear and resonant with the transition lines of 168 Yb, and the effects of Doppler broadening and laser bandwidth are incorporated. Firstly, the thin medium dynamics are examined to determine the optimal energy of laser pulses for the selective photoionization of 168 Yb, and to determine Yb isotopes which have a large influence on the excitation of 168 Yb. Secondly, the thick medium dynamics are investigated, resulting in the fact that the laser pulse for the first transition is prominently deformed due to the near-resonant interaction with 171 Yb and 173 Yb, and the ion yield along the propagation of the laser beam is strongly dependent on the initial energy of pulse for the first transition and the time-delay between input pulses.
Propagation of dichromatic femtosecond laser pulses tuned respectively in single-photon resonances with the cascade three-level system is studied. The initial areas of the two pulses are both equal to 2π, which makes them respectively an optical soliton in ideal two-level systems. When the dichromatic solitons are synchronized into the medium, both the temporal shapes and the spectral distributions of the pulses are strongly distorted during propagation. The delay time between the dichromatic solitons plays an important role on the evolution of the fields.