Intensity Fluctuations in Multimode Lasers with Spatial Hole Burning

Abstract
The intensity fluctuations in multimode lasers with spatial hole burning are investigated. We give experimental evidence for a self-organized collective behavior resulting from the cross saturation dynamics of spatially hole-burned lasers, in which each mode is characterized by N relaxation oscillation frequencies ω l (l=1, 2, 3,···, N; N: number of oscillating modes), while the total output exhibits a unique relaxation oscillation at the highest frequency in ω l which coincides with that in a single mode laser.