Coherent random lasing controlled by Brownian motion of the active scatterer

Shuofeng Liang, Leicheng Yin, Zhenzhen Zhang, Jiangying Xia, Kang Xie, Gang Zou, Zhijia Hu, Qijin Zhang

Research output: Contribution to journalArticlepeer-review


The stability of the scattering loop is fundamental for coherent random lasing in a dynamic scattering system. In this work, fluorescence of DPP (N, N-di [3-(isobutyl polyhedral oligomeric silsesquioxanes) propyl] perylene diimide) is scattered to produce RL and we realize the transition from incoherent RL to coherent RL by controlling the Brownian motion of the scatterers (dimer aggregates of DPP) and the stability of scattering loop. To produce coherent random lasers, the loop needs to maintain a stable state within the loop-stable time, which can be determined through controlled Brownian motion of scatterers in the scattering system. The result shows that the loop-stable time is within 5.83 × 10−5 s to 1.61 × 10−4 s based on the transition from coherent to incoherent random lasing. The time range could be tuned by finely controlling the viscosity of the solution. This work not only develops a method to predict the loop-stable time, but also develops the study between Brownian motion and random lasers, which opens the road to a variety of novel interdisciplinary investigations involving modern statistical mechanics and disordered photonics.
Original languageEnglish
Article number095401
JournalJournal of Physics B: Atomic, Molecular and Optical Physic
Issue number9
Publication statusPublished - 16 Apr 2018

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