Abstract
An active volume scaling in the bore and length of a Sr atom laser excited in a nanosecond pulse longitudinal He–SrBr2 discharge is carried out. The optimal temperature regime is found for laser oscillation on several different Sr atom and ion lines. The optimal discharge conditions for achieving a maximal multiline average output power are also found. At multiline operation a record average output power of 4.25 W is obtained, more than 90% of which is concentrated on the 6.45 µm Sr atom line. The radial distribution of the laser intensity is obtained experimentally to be a high-beam-quality Gaussian profile.
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