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Progress in Crystal Growth and Characterization of Materials

Quantum interference in nonlinear optical processes using strong-field coupling in atomic hydrogen

M. Katsuragawa, G. Z. Zhang, R.S.D. Sihombing, Yasusada Ohta, K. Hakuta

Published Jan 1, 1996• 0 citations
Publisher
DOI
10.1016/0960-8974(96)83671-0

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Physical review. B, Condensed matter•Jun 15, 1999•55 citations
The sum-frequency generation process using strong-field coupling and quantum interference is described systematically using atomic hydrogen both in theory and experiment. It is shown that strong coupling at the 3p-2s transition creates destructive interference to reduce the linear susceptibility at the resonant 3p\ensuremath{\leftarrow}1s transition. Simultaneously, two-photon coupling of the 2s and 1s states produces constructive interference to resonantly enhance the nonlinear susceptibility for sum-frequency generation at the 3p\ensuremath{\rightarrow}1s (Lyman-\ensuremath{\beta}) transition. Experimental results clearly demonstrate the theoretical predictions. When the Rabi frequency for the 3p-2s coupling exceeds the Doppler tail of the medium, the photoion signals on resonance are suppressed significantly because of induced transparency. The generated Lyman-\ensuremath{\beta} radiation grows rapidly by a factor of 250 at an atom density of 1015{10}^{15}1015 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}3}$ and interaction length of 3.5 cm, resulting in a conversion efficiency of 2\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}4}$.
The quantum interference is studied in a spontaneous emission of a four-level atom driven by three coherent fields. Deriving the equation of motion in the interaction picture we obtain the susceptibility. It is shown the susceptibility is different from the conventional nonlinear optics. The atom exhibits strong nonlinear effects when the spontaneous is at resonance, though it is weak. We can apply this new phenomenon to many fields such as making quantum device, detecting weak signal and processing quantum information.
We study quantum interference and nonlinear optical processes in the conduction band of an n-doped quantum well driven by one or two infrared fields. The fields couple a broad upper subband to a lower energy subband and the ground subband, forming a \ensuremath{\Lambda} configuration. We show, including the effect of electron-electron scattering and dynamic screening, that this configuration can lead to coherent control of the intersubband transitions, such as coherent population trapping. We also study quantum interference processes, such as laser-induced transparency and dark-line effects in the linear absorption and gain spectra of the system. The effects on these processes of differing field intensities and of electron-electron scattering are also discussed.