Organic solid-state distributed feedback dye laser with a nonmorphologicalmodification grating

We report an organic solid-state distributed feedback laser consisting of a n organic active layer and a Bragg grating without morphological change. Th e active layer consists of 4-(dicyanomethylene)-2-methyl-6-(4-dimethylamino stryl)-4H-pyran as a laser dye, tris(8hydroxyquinoline) aluminum as a host, and poly(methyl methacrylate) as a binder. The threshold and linewidth of the laser are 400 mu J/cm(2) and 1.5 nm, respectively. With this laser, the Bragg grating exists out of the active layer and the grating surface is fl at, which are very important for device fabrication and electric driving of the laser. (C) 2000 American Institute of Physics. [S0003-6951(00)03243-5] .