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The operating characteristics and scaling parameters of a flashlamp‐pumped, 4‐m‐long IBr laser were investigated to further evaluate its potential as a solar‐pumped laser. A peak power of 3 kW/cm2 at 2.7 μm was achieved at 4‐Torr IBr pressure. A gain of 0.07 m-1 was measured at a maximum capacitor discharge energy of 4 kJ. The threshold input power necessary for lasing was found to decrease by a factor of 4 and the laser pulse width increased fourfold as the active gain length was increased from 1 to 4 m. A maximum pulse width of 120 μs was achieved with 10‐Torr argon diluent added to 4‐Torr IBr. Quenching of the excited state by the parent molecule was shown to be unimportant for pressures less than 4‐Torr IBr. An intrinsic efficiency in the range of 12% has been measured for flashlamp‐pumped IBr.