Presentation Information

[22p-13M-3]Effect of laser wavelength tunability by distributed feed-back resonator dimensions

〇(P)Buddhika Karunathilaka1, Nobuhiro Takeishi1, Chihaya Adachi1 (1.Kyushu University)


Organic laser,Distributed feed-back resonator,Laser peak wavelength

The evolution of organic optoelectronic materials paved the pathway for optically pumped organic semiconductor lasers (OSLs) and electrically pumped organic semiconductor laser diodes (OSLDs). Among the various feedback resonator structures to observe lasing, distributed feedback resonators (DFBs) became more popular due to their excellent performance and freedom to alter the cavity parameters. According to the coupled wave theory, the gain coupling of a DFB resonator depends on the cavity dimensions such as film thickness, period, pitch height, etc. In contrast, the index coupling of a DFB depends on the interlayer refractive index difference of the materials in the waveguide. Thus, careful evaluation and tuning of DFB cavity dimensions until the laser peak wavelength equals the ASE wavelength is very important to reduce the lasing threshold by maximizing the gain coupling.