Spatial distribution and mode structure of laser emission from Zn$_x$Cd$_{1-x}$S single-crystal platelets subjected to one-photon optical excitation

An investigation was made of the spatial distribution of the laser emission from $Zn_xCd_{1-x}S$ ($0\le x\lesssim 0.5$) platelet single crystals at various temperatures including the range $T\le300^\circ$ K when excited with a nitrogen laser. The widely used Fabry–Perot resonator model failed to explain the main features of the spatial distribution. The experimental results were interpreted on the basis of a model of a rectangular dielectric “box” resonator.