Pulse-to-pulse instability in the emission from a random laser based on Nd:Sc
3(BO
3)
4 ceramic with immobile scatterers was studied below, at, and above the stimulated emission threshold
Pth. The correlation between pumping and emission intensities was found to be surprisingly low, especially in the vicinity of the lasing threshold. When the sample was excited by reasonably stable (\ifmmode\pm\else\textpm\fi{}5
) pumping pulses, a strong fluctuation of output intensities was observed in the range of pumping energies
Pth/2
P 2
Pth---the range in which the L\'evy statistics of emission fluctuations has been predicted in random lasers. We thus report on experimental evidence of the L\'evy statistics in a random laser with firmly fixed scatterers.
In this paper,we discuss the emission photon statistics of V -type three-level single molecule with permanent dipoles,which driven by continuous laser and electric radio frequency(rf) fields,via the generating function method developed recently.The average emission photon numbersN,lineshapes and the Mandel's Q parameters are studied at different detuning frequency and rf strength(internsity). The waiting time distribution w(t) is also studied.The results demonstrate that the emission photon statistical properties is strongly affected by the laser frequency and rf strength(intensity),in the other hand,we can control the emission photons through the external field.