講演情報
[16a-PB5-4]Low-threshold random lasing in dye-doped liquid crystal elastomer films with TiO2 nanoparticles
〇(M2)Bo-An Chu1, Yu-Chieh Cheng1 (1.Taipei Tech)
キーワード：
random optical phenomena、liquid crystals
Liquid-crystal Random Lasers (LCRLs) have attracted increasing attention in soft-matter photonics owing to their ultrathin structures, fabrication flexibility, and tunable optical properties. In this study, polymer-based random laser films were fabricated using a Liquid Crystal Elastomer (LCE) as the host matrix, with the laser dye Pyrromethene 597 (PM597) incorporated as the gain medium and Titanium dioxide (TiO2) nanoparticles introduced to provide multiple scattering feedback. Through the synergistic coupling between the intrinsic ordering of the liquid crystal structure and the scattering mechanisms, random lasing emission was effectively realized. The experimental results indicate that the random lasing threshold of this system is approximately 3.333 mW /mm2, corresponding to a pump energy density of 1.667 × 10-4 mJ /mm2. Moreover, stable random laser emission can be sustained under a low repetition-rate pumping condition of approximately 1 Hz, with a continuous operation duration exceeding 30 minutes.