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Compact, repetitively fired, gain-saturated x-ray lasers have been limited to wavelengths above λ=8.85 nm. Here we discuss their extension to λ = 6.85 nm by transient traveling wave excitation of Ni-like Gd ions in a plasma created with an optimized pre-pulse followed by rapid heating with an intense sub-ps pump pulse. Isoelectronic scaling also produced strong lasing at 6.67 nm and 6.11 nm in Ni-like Tb, and amplification at 6.41 nm and 5.85 nm in Ni-like Dy.
J. J. Rocca,A. Rockwood,Y. Wang,S. Wang,M. Berrill,V. N. Shlyaptsev,H. Bravo, andC. S. Menoni
"Demonstration of Multi-Hz repetition rate x-ray lasers at shorter wavelengths", Proc. SPIE 11886, International Conference on X-Ray Lasers 2020, 1188606 (8 July 2021); https://doi.org/10.1117/12.2595362
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J. J. Rocca, A. Rockwood, Y. Wang, S. Wang, M. Berrill, V. N. Shlyaptsev, H. Bravo, C. S. Menoni, "Demonstration of Multi-Hz repetition rate x-ray lasers at shorter wavelengths," Proc. SPIE 11886, International Conference on X-Ray Lasers 2020, 1188606 (8 July 2021); https://doi.org/10.1117/12.2595362