Using Saturn as a driver, we are pursuing both photoresonantly pumped and photoionization/recombination lasers. Our lasing targets are gas cells with thin windows that are pumped by a z pinch 2 cm away radiating 10 TW. In both schemes the lasant and gas fill is neon. We will present evidence for inversion in the sodium/neon photoresonant scheme but we have yet to detect the lasing transition itself. To increase our chances of measuring this line we have introduced potassium into a sodium z-pinch and have eliminated oxygen from the gas cell windows.
Tom J. Nash,
Rick B. Spielman,
"Photo-pumped x-ray laser research on Saturn", Proc. SPIE 2012, Ultrashort Wavelength Lasers II, (1 February 1994); doi: 10.1117/12.167376; https://doi.org/10.1117/12.167376