Abstract
This thesis is concentrated on the emission behaviors of an optically pumped composite organic thin-film laser with two-dimensional distributed feedback (2D-DFB) structure. We use famous red fluorescent dye of 4-(dicyanomethy-lene)-2-terbuty1-6-(1,1,7,7-tetramethyljulolidin-4-y1-vinyl)-4H-pyran (DCJTB) as the laser gain media which reveals strongly amplified spontaneous emission (ASE) phenomenon. We report the optical gain and loss characteristics of DCJTB doped in Poly(N-vinylcarbazole) (PVK) of different molecular weight, 90000 and 1100000, respectively via ASE theory. 2D-DFB structure with triangular lattice is adopted for laser cavity and fabricates by electron beam lithography. With a suitable laser cavity and the high gain material, lasing action with peak wavelength of 621 nm is observed in the organic 2D-DFB laser. The far-field emission pattern is also discussion in this thesis.