Stimulated resonance Raman scattering from dye-doped polymer waveguides

We have investigated stimulated resonance Raman scattering (SRRS) from dye-doped polymer thin film waveguides. 1,4-bis[2-[N,N-di(p-totyl)amino]phenyl]vinyl]benzene (DADSB) was used as a dye doped in a spin-coated film of poly(vinyl-pyrrolidone) (PVP). Under optical pumping at the absorption edge of DADSB, a very narrow line (full width at half maximum similar to 0.5 nm) was observed only in the spectral region where the amplified spontaneous emission (ASE) band appeared. This emission line was assigned to SRRS with a Raman shift of 1600 cm(-1). The threshold excitation energy for this SRRS is higher than that of the ASE, but the slope efficiency of the SRRS was higher than that of the ASE. The polarization-dependent intensity revealed that the SRRS was propagated by the transverse electric mode in the thin film waveguide as same as the ASE. (c) 2006 American Institute of Physics.