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Enhancement of second harmonic generation in helical Sc liquid crystals
Authors:Martin   opi   Irena Dreven&#x  ek-Olenik
Institution:  a Department of Physics, Institute J. Stefan, University of Ljubljana, Ljubljana, Slovenia
Abstract:In a ferroelectric liquid crystal, a special type of phase-matching for optical second harmonic generation (SHG) is possible, where two counter-propagating fundamental waves create second harmonic waves at the edge of the selective reflection band. We compute the SHG intensity in such a situation and show that, at slight detuning from exact phase-matching, useful resonance enhancement can be obtained. A considerable amount of SHG also appears when the second harmonic frequency is in the reflection band, where the SHG wave is non-propagating.
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