Abstract
Three-wave mixing of light has been observed in connection with a giant two-photon absorption generating excitonic molecules. The efficiency of mixing of light for energies 2Ω 1 - Ω 2 and 2Ω 2 - Ω 1 is enhanced remarkably when Ω 1 and/or Ω 2 is varied across the giant two-photon absorption band-region. Moreover, the mixed lights with energies 3Ω 1 - 2Ω 2 and 4Ω 1 - 3Ω 2 have also been detected.
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