Efficient coherent light amplification with a very high net exponential gai
n Gamma approximate to 2600 cm(-1) has been observed in sandwich-type hybri
d-polymer-liquid-crystal structures. The amplification is a result of an en
ergy exchange between two beams in a two-beam coupling experiment. The repo
rted gain coefficient has been measured in a tilted sample configuration wi
thin a Raman-Nath diffraction regime at electric fields of the order of 1 V
/mu m. (C) 1999 American Institute of Physics. [S0003-6951(99)03115-0].