Abstract

The demonstration of a $69.8\mathrm{nm}$ laser on $3p$ ${}^3{P}_2-3s$ ${}^1{P}_1$ ($J=2-1$) transition of Ne-like Ar pumped by capillary discharge is reported in this Letter. A main current of $12\mathrm{kA}$ with rise time of $43\mathrm{ns}$ was chosen to generate the plasma in a $35\mathrm{cm}$ long capillary filling with pressure of Ar as low as $11\mathrm{Pa}$, resulting in a gain coefficient of $0.34{\mathrm{cm}}^{-1}$ and gain–length product of 11 at $69.8\mathrm{nm}$. Also observed is a weak laser on $3p$ ${}^3{D}_2-3s$ ${}^3{P}_1$ ($J=2-1$) transition of Ne-like Ar at $72.6\mathrm{nm}$ in the same condition. In addition, multiwavelength lasing at 46.9, 69.8, and $72.6\mathrm{nm}$ was simultaneously realized in a capillary discharge plasma column, conditioning the pressure of Ar to $13\mathrm{Pa}$.

© 2011 Optical Society of America

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