We have measured the evolution of the intensity emitted by a random laser during a pump pulse that is comparable in duration to the spontaneous emission decay time. The time traces of our random laser, consisting of titanium dioxide particles and sulforhodamine B dye, show clear relaxation oscillations. We compare our experimental results to an analytic, conventional model based on the four-level rate equations for a single-mode laser. The measured frequency of well-resolved fluctuation oscillations suggests an effective mode lifetime of 5 ps.
|Number of pages||4|
|Journal||Physical review A: Atomic, molecular, and optical physics|
|Publication status||Published - 2009|
van der Molen, K. L., Mosk, A., & Lagendijk, A. (2009). Relaxation oscillations in long-pulsed random lasers. Physical review A: Atomic, molecular, and optical physics, 80(055803), 1-4. https://doi.org/10.1103/PhysRevA.80.055803