Whispering-Gallery-Mode for Coherent Random Lasing in a Dye-Doped Polystyrene Encapsulated Silica-Glass Capillary

Abstract

Dye-doped polystyrene (DDPS) encapsulated in a silica-glass capillary with a diameter of 300 μm was fabricated through radical polymerization of styrene within the capillary. The coherent random lasing (RL) with full width at half maximum (FWHM) of 0.36 nm and a quality factor of 1608 was produced in the DDPS with the capillary when pumping at 532 nm. However, the incoherent RL with FWHM of 6.62 nm and a quality factor of 92 was produced in the DDPS without the capillary. A detailed investigation on this phenomenon by changing the diameter of the capillary and core refractive index (RI) reveals that there exists a strong whispering gallery mode (WGM) resonance in the capillary, which helps generate the coherent RL. The findings may open up a new approach for the fabrication of highly efficient photonic devices.

Dual chaos encryption for color images enabled in a WGM–random hybrid microcavity

“…42 For instance, Nie et al reported a dye-doped polystyrene-encapsulated silica-glass capillary, in which a strong WGM resonance in the capillary helps the generation of coherent RL when the refractive index of the filling medium is greater than that of the glass capillary. 43 Chen et al modified SiO 2 nanospheres in the surface of ZnO nanorods, pumping out a random laser with the aid of the WGM resonance effect of spherical particles. 44 Furthermore, in 2021, Shi et al proposed a spectral encryption approach based on selectively visualized spectral modes in RL by coupling them with an external WGM cavity.…”