Femtosecond Degenerate Four-Wave-Mixing in ZnO Microcrystallite Thin Films
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Abstract
Transient third-order optical nonlinearity Χ(3) of ZnO microcrystallite thin films is measured at various temperatures by using femtosecond degenerate four-wave-mixing. Room-temperature excitonic enhancement of Χ(3) is observed. The magnitude of Χ(3)) ranges between 10-4 to 10-6 esu from 4.2K to room temperature. The measured Χ(3)response time ranging from 200 to 300fs is ultrafast for temperature down to 4.2K.
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