Self-photopumped x-ray lasers from elements in the Ne-like and Ni-like ionization state

Siegrist, Michael; Staub, Felix; Jia, Fei; Feurer, Thomas; Balmer, Jürg; Nilsen, Joseph (2017). Self-photopumped x-ray lasers from elements in the Ne-like and Ni-like ionization state. Optics communications, 382, pp. 288-293. Elsevier 10.1016/j.optcom.2016.07.084

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We report on experiments on the self-photopumped 3d ¹P₁→3p ¹P₁ and 4f ¹P₁→4d ¹P1 laser transitions in Ne-like and Ni-like ions, respectively. Lasing on the self-photopumped laser line has been observed for the first time for a number of elements including Ne-like V, Cr, Fe, and Co as well as Ni-like Ru and Pd. We have investigated the lasing process by varying the prepulse delay, which shows a shift of the optimum main pulse to second prepulse delays towards lower values with higher atomic number Z. Time-resolved measurements showed that self-photopumped and monopole collision-pumped lasing emission occurs essentially simultaneously. Accurate wavelength measurements and calculations are shown to be in excellent agreement.

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