Time-domain modeling of random lasing in quasi-2D perovskites (Invited Paper)

In this work, we present our recent study on coherent random lasing (as opposed to cavity-based lasing) in subwavelength quasi-2D perovskite films. We have studied a quasi-2D metal halide perovskite as a promising light harvesting and emitting media, having high optical absorption and low-threshold amplified spontaneous emission upon optical pumping with femtosecond laser pulses. Initially, we performed statistical analysis of spectral measurements, revealing Lévy-like intensity fluctuations and coherent lasing modes associated with the crystal grain structure of perovskites [1]. Then, to explore the full-wave transient mechanism of random lasing in perovskites, we develop experiment-based time-domain multi-physics models based on population dynamics in multi-level atomic systems coupled to a full-wave electromagnetic solver. The retrieved kinetic parameters of the multi-level system are discussed. The constructed rate equations and dynamic model can be utilized further for other novel mixed halide perovskites for description of lasing in such systems. [1] Fruhling, C., et.al., “Coherent Random Lasing in Subwavelength Quasi‐2D Perovskites,” Laser Photonics Rev., 2200314, 2023.