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Quantum optimal control of rovibrational excitations of a diatomic alkali halide: one-photon vs. two-photon processes

二原子ハロゲン化アルカリ分子の振動回転励起の量子最適制御:1光子vs2光子過程

黒崎 譲*; 横山 啓一

Kurosaki, Yuzuru*; Yokoyama, Keiichi

二原子ハロゲン化アルカリ分子の振動回転励起に関して、最適制御理論に基づいて最適レーザー電場波形を計算した。今回は2光子過程の効果を計算に取り入れるために分子と電場の相互作用ハミルトニアンに分極率の項を追加した。その結果、弱い電場強度では従来と同じ1光子過程のみが関与する最適波形が得られた。一方、比較的強い電場強度では2光子過程と1光子過程が同時に寄与する電場波形が得られた。これらの結果は2光子過程の効果を最適制御計算にうまく取り込めていることを示唆している。これにより、より現実的な計算が可能になった。

Regarding rovibrational transitions of diatomic alkali haride molecules, optimal waveform of laser electric field was calculated on the basis of the optimal control theory. In this study, we implemented the polarizability term into the Hamiltonian, which defines the field-molecule interaction. As a result, we obtained waveforms causing both one- and two-photon processes in a relatively high electric field regime, while waveforms causing only one-photon process was observed in a weak filed regime as well as the previous study. These results imply that the effect of two-photon process is successfully taken into account in the optimal control theory calculation. Now we can expect more reliable calculation even for strong laser field.

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