We report the demonstration of a guided-wave nonlinear process in the
material rubidium titanyl arsenate (RTA). Quasi-phase-matched frequenc
y doubling of 874.5 nm light was achieved in a Cs:RTA waveguide, with
a normalized conversion efficiency of 225%/W cm(2). We also report pha
se matching characteristics for bulk periodically poled RTA. (C) 1996
American institute of Physics.