Relaxation oscillations in long-pulsed random lasers

Karen L. van der Molen, Allard P. Mosk, and Ad Lagendijk

Phys. Rev. A 80, 055803 – Published 19 November 2009

Abstract

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.

Received 12 September 2008

DOI:https://doi.org/10.1103/PhysRevA.80.055803

Authors & Affiliations

Karen L. van der Molen^1,*, Allard P. Mosk¹, and Ad Lagendijk²

¹Complex Photonic Systems, MESA+ Institute for Nanotechnology and Department of Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
²FOM Institute for Atomic and Molecular Physics (AMOLF), Kruislaan 407, 1098 SJ Amsterdam, The Netherlands

^*k.l.vandermolen@alumnus.utwente.nl

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Issue

Vol. 80, Iss. 5 — November 2009

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