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Kurosaki, Yuzuru*; Yokoyama, Keiichi
Chemical Physics, 493, p.183 - 193, 2017/08
Times Cited Count：5 Percentile：20.53(Chemistry, Physical)Electric field of laser pulses which gives maximum selectivity in the isotope-selective rovibrational excitation of lithium chloride molecules is calculated. Applying the optimal control theory, we calculate optimal electric field to produce mixture of LiCl-35 (
=0, 
=0) and LiCl-37 (=1, =1) from molecular ensemble of LiCl-35 (=0, =0) and LiCl-37 (=0, =0). As a result, it is found that electric field which permit rotational excitations only gives high yield in the selective excitation compared to the electric field which permit both rotational and vibrational excitations.
Yokoyama, Keiichi; Teranishi, Yoshiaki; Toya, Yukio; Shirai, Toshizo; Fukuda, Yuji; Aoyama, Makoto; Akahane, Yutaka; Inoue, Norihiro*; Ueda, Hideki; Yamakawa, Koichi; et al.
Journal of Chemical Physics, 120(20), p.9446 - 9449, 2004/05
Times Cited Count：6 Percentile：18.51(Chemistry, Physical)Optimal laser control for ultrafast selection of closely-lying excited states, whose energy separation is smaller than the laser bandwidth, is reported on the two-photon transition of atomic cesium; Cs(6S 
7D
, J = 5/2 and 3/2). Selective excitation was carried out by pulse shaping of ultrashort laser pulses which were adaptively modulated in a closed-loop learning system handling eight parameters representing the electric field. Two-color fluorescence from the respective excited states was monitored to measure the selectivity. The fitness used in the learning algorithm was evaluated from the ratio of the fluorescence yield. After fifty generations, a pair of nearly transform-limitted pulses were obtained as an optimal pulse shape, proving the effectiveness of "Ramsey fringes" mechanism. The contrast of the selection ratio was improved by 
30 % from the simple "Ramsey fringes" experiment.
F
doped with samariumWells, T. P. R.*; Sugiyama, Akira; Han, T. P. J.*; Gallagher, H. G.*
Journal of Luminescence, 85, p.91 - 102, 1999/00
Times Cited Count：31 Percentile：77.94(Optics)no abstracts in English
Kurosaki, Yuzuru*; Yokoyama, Keiichi
no journal, ,
Electric field of laser pulses is designed by the optimal control theory. The target process is isotope-selective rovibrational excitation of two isotopologues of the lithium chloride molecule, Li
Cl or Li
Cl. The calculation includes both radial and angular motion of atoms in molecule. As a result, it is found that a laser pulse field which can cause isotope-selective rovibrational excitation with high yield exists.
