Three-Photon-Excitation Spectroscopy for the Exciton Relaxation in Alkali Halides.

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  • Tanimura Katsumi
    Department of Physics, Nagoya University, Furo–cho, Chikusa, Nagoya 464–01

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  • Three-Photon Excitation Spectroscopy fo

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The yields of σ and π luminescence due to self-trapped excitons have been measured upon the three-photon excitation (TPE) which gives rise to the resonance on the upper branch of the lowest exciton-polariton in NaCl and KI. Both the σ and π luminescence are induced by the TPE in the whole wavelength range of the resonance, and the yield of the σ luminescence relative to that of the π luminescence is as high as that by the conventional band-to-band excitation, showing strong contrast to the result of the one-photon excitation (OPE) spectroscopy. The different feature of the σ -luminescence excitation in TPE from that in OPE has been discussed.

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