Analysis of waveguide properties of organic semiconductor lasers

Design and analysis of a low-threshold polymer circular-grating distributed-feedback laser

“…The polymeric laser designs under analysis generally exhibit lower gain thresholds owing to much stronger coupling arising from the high optical confinement of the TE mode. This is in accordance with previous studies of waveguiding in optical organic waveguides 4 in which high optical confinement and low propagation losses were noted.…”

“…The TE and TM modes in the MEH-PPV film waveguide are analyzed with a semianalytical technique, 4 in which the Helmholtz wave equation is solved subject to appropriate boundary conditions at the layer interfaces. With n o () as the wavelength-dependent refractive index, where is the wavelength in nanometers, the dispersion of the polymer is represented with a Sellmier formula [Eq.…”

Design of organic semiconductor laser structures for low threshold operation

“…Figure 8 shows the solutions to the re¯ectivity function located by the APM [12] for a 500 mm long cavity, the ® rst-order longitudinal mode having a threshold gain of 97 cm ¡1 , comparable to the gain guided, multi-mode slab OSL analysed in [11]. This con® rms that the present con® guration would be a viable design for a single transverse mode OSL.…”

“…In both cases, threshold gain can be further decreased by increasing the length of the corrugated sections; the relationship between gain threshold and corrugation length was discussed in [11].…”

“…In [11], the use of a rib structure allowed the number of modes across the device to be determined independently of the pump pro® le, which has negligible eå ect of the eå ective indices in comparison with the rib. For the DFB and DBR structures, the dimensions of the structure were selected to support a single transverse mode.…”