Transition from non-resonant to resonant random lasers by the geometrical confinement of disorder

Abstract

We report on a novel kind of transition in random lasers induced by the geometrical confinement of the emitting material. Different dye doped paper devices with controlled geometry are fabricated by soft-lithography and show two distinguished behaviors in the stimulated emission: in the absence of boundary constraints the energy threshold decreases for larger laser volumes showing the typical trend of diffusive {\it non-resonant} random lasers, while when the same material in lithographed into channels, the walls act as cavity and the {\it resonant} behavior typical of standard lasers is observed. The experimental results are consistent with the general theories of random and standard lasers and a clear phase diagram of the transition is reported.

4 pages, 3 figures

References in corpus (5)

• The mode-locking transition of random lasers
• Condensation in disordered lasers: theory, 3D+1 simulations and experiments
• Statistical studies of random lasing modes and amplified spontaneous emission spikes in weakly scattering systems
• The frustrated Brownian motion of nonlocal solitary waves
• Laser beam filamentation in fractal aggregates

Cited by in corpus (2)

• Heterogeneous Random Laser with Switching Activity Visualized by Replica Symmetry Breaking Maps
• Biomimetic random lasers with tunable spatial and temporal coherence