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Journal of the Korean Physical Society

Counterpropagation of Laser Pulses for Effectively Exciting a Doppler-Broadened Three-Level Atomic $^{168}$Yb Medium

A. S. Choe, Yongjoo Rhee, Jongmin Lee

Published Apr 1, 1997• 0 citations
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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.

Journal of Physics B Atomic Molecular and Optical Physics•Sep 14, 1995•15 citations
Counterpropagation of Laser Pulses for Effectively Exciting a Doppler-Broadened Three-Level Atomic 168^{168}168Yb Medium
A principle for the efficient excitation of a three-level medium in a selective photoionization method is examined. It is shown that with special detunings for a given set of the laser-atom interaction the third-level population can be maximized. The expression of the optimal detunings is derived near the two-photon resonance region. It is shown that if the optimal detuning method is applied to three-level systems of Yb and Ca, the first-level populations are inverted to their corresponding third levels by about 100% and 86%, respectively. Application of this method to a Doppler-broadened medium is discussed and it is found that the optimal detuning method with counterpropagating waves will be very effective for selective ionization of wanted atoms.
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.