Journal
APPLIED PHYSICS LETTERS
Volume 79, Issue 27, Pages 4488-4490Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1430860
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We present results on the orientational photorefractive effect in a mesogenic nematic doped with multiwalled carbon nanotubes. Efficient coherent-beam amplification of a signal beam by energy exchange with a pump beam was observed in homogeneous cells of the doped liquid crystal E7 at electric fields of similar to0.5 V/mum. Photorefractive gains as high as 10(3) cm(-1) are achieved in the Raman-Nath regime. It is found that the gain coefficient depends strongly on the externally applied dc voltage, the pump/probe intensity ratio and the total input intensity. (C) 2001 American Institute of Physics.
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