Abstract
We have observed an optical gain at the wavelength of 126 nm in an Ar excimer (Ar 2 * ) amplifier by utilizing a femtosecond vacuum ultraviolet (VUV) seed beam tuned at 126 nm. The maximum optical gain value of 1.1 cm -1 with a spatial distribution in the optical-field-induced ionization (OFI) Ar plasma was observed. The plasma diagnosis revealed that the plasma contraction near the plasma amplifier axis together with the plasma expansion was a key issue to observe such a high optical gain value inside the Ar plasma filament. The center axis of the contracted plasma amplifier showed the high electron density more than 10 18 cm -3 even after 100 ns from the plasma production of Ar at 1 MPa. Our OFI plasma/excimer kinetics code reproduced the temporal progress of the optical gain distribution as well as the maximum gain value.
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