The phase-conjugation in crystalline CuCl has been studied at 1.6 K. It has been found that the two-photon resonance of the $\varGamma_{1}$-excitonic molecule and the one-photon resonance of the $\varGamma_{5}$-exciton contribute to the generation of the phase-conjugated wave. Each contribution has been separated spectroscopically by adjusting the polarization configuration of the incident fields adequately and has been compared qualitatively with the theory. The efficiency of the phase-conjugated reflection has become maximum at around the two-photon resonance of the excitonic molecule, 3.186 eV and has been ∼1% at the maximum.

Journal of the Physical Society of JapanJun 1, 198327 citations

Optical nonlinearities due to excitonic molecules: Optical Stark effects and phase conjugation

Eiichi Hanamura

Physical review. B, Condensed matterOct 15, 199115 citations

Physics Letters A

Singular enhancement of phase-conjugated wave generation near the mobility edge of an exciton

Nobuhiko Taniguchi, Eiichi Hanamura

Published Mar 1, 1993• 0 citations

Publisher

DOI: 10.1016/0375-9601(93)90555-e

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Phase-Conjugation by Four-Wave Mixing in CuCl: Resonance Enhancement by Exciton and Excitonic Molecule and Its Polarization Dependence

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The phase-conjugation in crystalline CuCl has been studied at 1.6 K. It has been found that the two-photon resonance of the $\varGamma_{1}$ -excitonic molecule and the one-photon resonance of the $\varGamma_{5}$ -exciton contribute to the generation of the phase-conjugated wave. Each contribution has been separated spectroscopically by adjusting the polarization configuration of the incident fields adequately and has been compared qualitatively with the theory. The efficiency of the phase-conjugated reflection has become maximum at around the two-photon resonance of the excitonic molecule, 3.186 eV and has been ∼1% at the maximum.The phase-conjugation in crystalline CuCl has been studied at 1.6 K. It has been found that the two-photon resonance of the $\varGamma_{1}$-excitonic molecule and the one-photon resonance of the $\varGamma_{5}$-exciton contribute to the generation of the phase-conjugated wave. Each contribution has been separated spectroscopically by adjusting the polarization configuration of the incident fields adequately and has been compared qualitatively with the theory. The efficiency of the phase-conjugated reflection has become maximum at around the two-photon resonance of the excitonic molecule, 3.186 eV and has been ∼1% at the maximum.

Journal of the Physical Society of JapanJun 1, 198327 citations

Optical nonlinearities due to excitonic molecules: Optical Stark effects and phase conjugation

Eiichi Hanamura

Large, nonlinear-optical phenomena are shown theoretically to be observable under nearly two-photon resonant pumping of the excitonic molecule (EM), e.g., in a CuCl crystal. When the exciton polariton (EP) is resonantly pumped into the EM, they are hybridized with each other and show optical Stark splitting. These splittings can be observed, respectively, as a sharp dip in the reflection spectrum and two-photon absorption spectrum due to the EM. We can also clarify how these splittings change into the blueshifts and redshifts of the EP and the EM as functions of the pump frequency and power. The generation of the phase-conjugated wave is shown also to be enhanced under two-photon resonant pumping of the EM. Some characteristics about pump-probe frequency and polarization dependences are also clarified. We have also derived the effective Hamiltonian of the exciton and the EM from the first-principles equation of motion for the exciton coupled with that of the EM. This Hamiltonian has made possible the theoretical analysis of these nonlinear-optical phenomena.Large, nonlinear-optical phenomena are shown theoretically to be observable under nearly two-photon resonant pumping of the excitonic molecule (EM), e.g., in a CuCl crystal. When the exciton polariton (EP) is resonantly pumped into the EM, they are hybridized with each other and show optical Stark splitting. These splittings can be observed, respectively, as a sharp dip in the reflection spectrum and two-photon absorption spectrum due to the EM. We can also clarify how these splittings change into the blueshifts and redshifts of the EP and the EM as functions of the pump frequency and power. The generation of the phase-conjugated wave is shown also to be enhanced under two-photon resonant pumping of the EM. Some characteristics about pump-probe frequency and polarization dependences are also clarified. We have also derived the effective Hamiltonian of the exciton and the EM from the first-principles equation of motion for the exciton coupled with that of the EM. This Hamiltonian has made possible the theoretical analysis of these nonlinear-optical phenomena.

Physical review. B, Condensed matterOct 15, 199115 citations

The phase-conjugation in crystalline CuCl has been studied at 1.6 K. It has been found that the two-photon resonance of the

\varGamma_{1}

-excitonic molecule and the one-photon resonance of the

\varGamma_{5}

-exciton contribute to the generation of the phase-conjugated wave. Each contribution has been separated spectroscopically by adjusting the polarization configuration of the incident fields adequately and has been compared qualitatively with the theory. The efficiency of the phase-conjugated reflection has become maximum at around the two-photon resonance of the excitonic molecule, 3.186 eV and has been ∼1% at the maximum.