We experimentally studied the spatial coherence of random laser emission from dye solutions containing nanoparticles. The spatial coherence, measured in a double slit experiment, varied significantly with the density of scatterers and the size and shape of the excitation volume. A qualitative explanation is provided, illustrating the dramatic difference from the spatial coherence of a conventional laser. This work demonstrates that random lasers can be controlled to provide intense, spatially incoherent emission for applications in which spatial cross talk or speckle limit performance.
© 2011 Optical Society of America
Lasers and Laser Optics
Original Manuscript: June 2, 2011
Revised Manuscript: August 1, 2011
Manuscript Accepted: August 3, 2011
Published: August 26, 2011
Brandon Redding, Michael A. Choma, and Hui Cao, "Spatial coherence of random laser emission," Opt. Lett. 36, 3404-3406 (2011)