Growth and characterization of 4-(N,N-dimethylamino)-3-acetamidonitrobenzene single-crystal cored fibers

Abstract

4-(N,N-dimethylamino)-3-acetamidonitrobenzene (DAN) single-crystal cored fibers with high optical nonlinearity were grown in glass capillaries with diameters between 7 and 40 μm. X-ray diffraction experiments showed that DAN crystals grown in the glass capillaries have an orientation with the a axis [100] along the fiber axis. This favorable orientation with the twofold axis perpendicular to the fiber axis allows the full use of the nonvanishing second-order nonlinear susceptibilities d22, d23, and d34. First experiments in a 20-mm-long fiber with a diameter d=7 μm showed a peak conversion efficiency of about 10−4 for frequency doubling of the 1.064 μm line of a pulsed Nd:YAG laser with a fundamental peak power P(ω) =57.1 W.