Multiple-pulse laser-induced damage in mercury cadmium telluride and cadmium telluride with a 1.06-μm laser in picosecond regime

Physics – Optics

Scientific paper

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Scientific paper

Multiple pulse damage in mirror polished samples of Mercury Cadmium Telluride & Cadmium Telluride at damage threshold has been studied using a 1.06 μm Nd: YAG laser of 35ps pulse duration. Damage morphology observed under Scanning Electron Microscope (SEM) is same for both HgCdTe & CdTe. It shows formation of a typical forest of micro-columnar structures which are aligned along the laser beam direction. All these micro-columns have 2-3 μm diameter round tip having a bright or white periphery. Formation of these micro-columns has been explained by hydro dynamical sputtering as proposed by Kelly and coworkers.

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