Three-Photon Sum Frequency Generation in β-AgI
D. Fröhlich; P. Köhler; Ch. Pahlke; D. Fröhlich; Institut für Physik, Universität Dortmund - 4600 Dortmund 50, Federal Republic of Germany; P. Köhler; Institut für Physik, Universität Dortmund - 4600 Dortmund 50, Federal Republic of Germany; Ch. Pahlke; Institut für Physik, Universität Dortmund - 4600 Dortmund 50, Federal Republic of Germany
Журнал:
EPL (Europhysics Letters)
Дата:
1988-10-15
Аннотация:
Three-photon sum frequency generation (TP-SFG) is introduced as a new technique to determine resonances on the upper polariton branch. First measurements on β-AgI yield information on the longitudinal-transverse splitting of exciton polaritons, which involve transitions from the upper valence bands (Γ<sub>7</sub>, Γ<sub>9</sub> symmetry) to the lowest conduction band (Γ<sub>7</sub> symmetry).
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