Near-threshold reflectivity fluctuations in the independent-convective-hot-spot-model limit of a spatially smoothed laser beam

Based on the independent-convective-hot-spot model limit of a spatially smoothed laser beam, it was found that the reflectivity exhibits large statistical fluctuations near the threshold of the amplification. The statistics of the reflectivity were detailed in terms of median reflectivity and confidence interval. It was shown that the critical intensity for the reflectivity remains a physically relevant quantity as the threshold of the reflectivity fluctuations.