Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 4: Semiconductor Lasers

HL 4.10: Vortrag

Montag, 5. September 2022, 12:15–12:30, H33

Random Lasing with Dye-doped Fluorescent Aerogels — •Matthias Kestler, Theobald Lohmüller, and Jochen Feldmann — Chair for Photonics and Optoelectronics, Nano-Institute Munich and Department of Physics, Ludwig-Maximilians-Universität (LMU), Königinstr. 10, 80539 Munich, Germany

Aerogels are a translucent, amorphous network of colloidal particles, which scatter light at visible wavelengths. Doping an aerogel matrix with fluorescent dyes or nano-particles enables their wider use for optical applications, including random lasing. Here, we report on the synthesis of fluorescent silica aerogels by supercritical drying of dye-doped silica gels. By our refined process, we obtain large, porous samples, where scattering events lead to closed photon paths that act as optical oscillators in the micrometer range. We analyze the corresponding photo-luminescence, amplified stimulated emission and random lasing spectra that are obtained for different dye-loaded aerogel samples. Random lasing is confirmed by different characteristic features like a lasing threshold, bandwidth narrowing and strongly fluctuating Anderson localized modes. Furthermore, we find that the extraordinary thermal stability of aerogels enables the use of high laser pumping energies without visible sample degradation.