A study on the minimum detectable energy density precise measurement method of STIL

This paper presents a precise measurement method of streak tube imaging LIDAR's (STIL's) minimum detectable energy density and the measurement result of a K008 streak tube. A Gaussian expression was used to approximate the one-dimensional intensity distribution of the laser spot. The laser pulse energy was measured with a sensitive photon counter while the diameter of the laser spot was measured by the single knife-edge method. After determining the parameters using the Gaussian expression and calculations, the authors concluded that the minimum detectable energy density of STIL in this experiment was 5.27 ± 0.11 × 10⁸ J mm^-2.