Supernarrowing mirrorless laser emission in dendrimer-doped polymer waveguides

A supernarrowing laser spectrum is observed for mirrorless polymer waveguide lasers containing rhodamine B cored dendrimers. The moderate scattering from the aggregated dendrimers in the host polymer matrix is responsible for the mirrorless lasing. However, the long amplification path through the waveguide produces a directional beam and supernarrowing a spectrum in scattering lasers. (C) 2000 American Institute of Physics. [S0003-6951(00)02350-0].