Abstract
We demonstrate a new method of light amplification based on forward four-wave mixing in photorefractive BaTiO(3). A single pump beam of combined (ordinary and extraordinary) polarization can be used for an efficient cw amplification of a signal wave with slightly shifted temporal frequency. A signal wave with an initial power of less than 1 nW is amplified ~100 times in a 3.2-mm-thick sample.
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