Solid-state organic DFB laser in near-infrared wavelength region

摘要

Solid-state dye-doped polymeric distributed-feedback lasers in near-infrared wavelength region were fabricated by photo nanoimprint lithography. Fluorinated-polyimide material which shows low propagation loss in the near infrared was used as the host matrix of the active waveguide doped with near-infrared organic dye, LDS950. Single wavelength lasing emission at 953 nm, which corresponds to the second–order Bragg reflection for the grating, was observed at room temperature from the laser by photo-pumping using nitrogen-gas laser. When the ambient temperature is raised, the lasing wavelength shifts to shorter at a ratio of 0.094 nm/K between 20 and 50°C, as the effective refractive index of the active region becomes smaller. The lasing threshold pumping density stays nearly constant during the temperature variation.