Initial observations have been made of laser action in ArCl excimers pumped by a high‐voltage fast‐rise‐time Blumlein discharge circuit. The new laser emits at 175.0 nm and operates at atmospheric pressure. The gas from which the molecules are formed consists of 1% Cl2, 15% Ar, and 84% He. A gain coefficient of 0.012 cm−1has been determined for ArCl.