Phys. Rev. A 80, 055803 (2009) [4 pages]Relaxation oscillations in long-pulsed random lasersReceived 12 September 2008; revised 30 June 2009; published 19 November 2009 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. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.80.055803
DOI:
10.1103/PhysRevA.80.055803
PACS:
42.60.Rn, 42.25.Dd, 42.55.Zz
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