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The optically pumped Hg laser at 546.1 nm, first developed by Djeu and Burnham, has now been operated as a sealed‐off rather than continuously flowing system, and with dc‐excited rather than rf‐excited pump lamps in both elliptically focused and close‐wrapped configurations. Laser power outputs of ∼1 mW cw have been obtained with ∼100 W excitation into two commercial Hg germicidal lamps, and a power output of ≳3 mW has been obtained from a sealed‐off tube with ∼300 W into a single low‐pressure ’’Toronto arc’’ pump lamp. Sealed‐off operation appears to be stable and long lived, and substantial further performance improvements are expected.