Coherent control of resonant two-photon excitation of excitons in Cu 2 O by phase modulated pulses

Takuro Ideguchi, Tetsuya Sakamoto, Kosuke Yoshioka, Makoto Kuwata‐Gonokami

Published May 4, 2008• 0 citations

Abstract

By using a pulse shaping method, we control the resonant two-photon excitation probability of 1s orthoexcitons in Cu2O and suppress the undesired three-photon interband transition which emerges at a high power excitation.

DOI: 10.1109/qels.2008.4553137

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Publisher

Abstract

DOI: 10.1109/qels.2008.4553137

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Femtosecond coherent phase control of resonance mediated

(2+1)

three-photon absorption is studied both theoretically and experimentally. The regime is perturbative of third order. The photoexcitation coherently combines elements of both nonresonant and resonance-mediated multiphoton transitions. By proper simple pulse shaping the three-photon absorption in Na is effectively controlled experimentally, enhanced up to $\ensuremath{\sim}300%$ of the absorption induced by the transform-limited pulse. It is achieved by phase manipulating intra- and intergroup interferences involving two groups of three-photon excitation pathways: (i) on resonance and (ii) near resonance with the intermediate resonance state accessed by nonresonant two-photon transition.

The intensity of the resonant emission of the

1s

orthoexcitons in

{\mathrm{Cu}}_{2}\mathrm{O}

is observed in a weak magnetic field under two-photon resonant excitation at

1.6\phantom{\rule{0.3em}{0ex}}\mathrm{K}

to investigate the quantum interference within the Zeeman sublevels in the Faraday configuration. A specific decrease of $\ensuremath{\sim}15%$ in the emission intensity is observed in the region of $\ifmmode\pm\else\textpm\fi{}0.2\phantom{\rule{0.3em}{0ex}}\mathrm{T}$. This structure is interpreted as a manifestation of the quantum interference effect between the Zeeman sublevels of the

1s

orthoexcitons, known as the Hanle effect in atomic spectroscopy. The homogeneous width of the exciton level is estimated to be $5.5\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{eV}$. The contribution of the quadrupole exciton polariton is discussed by taking into account the geometry-dependent characteristics of the exciton-polariton on the direction of the magnetic field. The Hanle structure observed is attributed to the interference of the polariton wave packets of the longitudinal excitons, where the phase coherence is transferred via transverse excitons driven by resonant two-photon coupling with the radiation field.