Amplification in Ni-like Nb at 204.2 Å pumped by a table-top laser
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- Basu, S., Hagelstein, P.L., Goodberlet, J.G. et al. Appl. Phys. B (1993) 57: 303. doi:10.1007/BF00332453
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We identified for the first time the 3d94d1S − 3d94p1P line in Ni-like Nb at 204.2 Å that was predicted to show gain. When pumped with a train of pulses containing less than 1 J per pulse, significant emission was recorded at 204.2 Å following the second and the third pulses. We measured the small signal gain coefficient per Joule of incident laser energy to be 1.49±0.42 cm−1 J−1 for this laser transition, which is higher by several orders of magnitude than that reported for other collisional laser systems in this wavelength range.