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Nonlinear effects in random lasers

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Fig. 1. Spatially dependent index of refraction. (a) n(x) of a 1D random structure. (b) n(x, y) of a 2D random structure, 5 × 5 µm 2
Fig. 2. (Color online) Relaxation oscillations in (a) pop- pop-ulation inversion and (b) intensity, for P r = 0.25 (solid black line) to P r = 0.28 (dotted red line) where  single-mode lasing occurs
Fig. 3. (Color online) (a) Differences between the in- in-tensity distributions of the threshold lasing mode with uniform and flat gain and that with successively  includ-ing (PP) partial gain, (FD) frequency-dependent gain, and (GS) gain saturation
Fig. 5. (a) Intensity and (b) wavelength vs. pumping rate P r of the (solid black line) first and (dotted gray line) second lasing mode
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