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Absorption (red line) and emission (red dashed line) spectra of Rhodamine 640 P and absorption spectrum of Qblue (blue line) dissolved in methanol.
(a) Emission spectrum above threshold for random laser samples 1–4. Pump powers: for sample 1, for sample 2 and 3, and for sample 4. (b) Width of the spectrum vs pump power for random laser samples 1–4.
(a) Spectra below (black, ) and above (gray, ) threshold for sample 5. The absolute peak spectral radiance is a factor higher for the spectrum above threshold. Peak indicated by blue square: peak 1. Peak indicated by red disk: peak 2. (b) peak spectral radiance for the two peaks normalized to the data point at vs pump power. The black line is the ratio of the absolute values of the two peaks.
Wavelength of peak emission vs pump power for sample 5. The peak at the blue side of the spectrum (left -axis) shows a blueshift, whereas the peak at the red side of the spectrum (right -axis) shows a redshift. The solid lines are guides to the eye.
Spectral position of the emission peak vs ratio between concentration of Qblue and Rh640 molecules. Black open circles: experimental data points for sample 1–4. Black open square: sample 5. Red, black, and green line: model with , 1.75 ps, and 3 ps, respectively, and . Blue dashed line: model with and .
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