Enhanced fluorescence from x-ray line coincidence pumping of K-pumped Cl and Mg-pumped Ge plasmas

Conference item

Many resonant photo-pumped X-ray laser schemes that use a strong pump line such as Ly-α or He-α to populate the upper laser state of a separate lasing material have been proposed over the last four decades but none have been demonstrated. As a first step to creating a photo-pumped X-ray laser we decided to reinvestigate some of these schemes at the Orion laser facility with the goal to demonstrate enhanced fluorescence as a first step toward creating a laser. In particular we look at using the Ly-α or He-α K lines to pump the 1s – 3p and 4p transitions in H-like Cl and see fluorescence on the 4f -3d line at 65 Å and the 3d – 2p line at 23 Å. Preliminary experiments are presented that show a modest enhancement of 40% on the 3d-2p line. As an alternative we also look at enhancing the 2p – 2s line in Ne-like Ge at 65Å using the Ly-α Mg line to photo-pump the 2s – 3p line of Ne-like Ge. Calculations are presented that suggest modest enhancements of 2.5 and recent experiments will be presented that show emission from a Ge plasma pumped by the Ly-α Mg line.

Authors: Nilsen, J; Burridge, D; Hobbs, LMR; Hoarty, D; Beiersdorfer, P

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Society of Photo-optical Instrumentation Engineers
• Host title: Proceedings Volume 11111, X-Ray Lasers and Coherent X-Ray Sources: Development and Applications XIII
• Article number: 1111105
• Series: Proceedings of SPIE
• Series number: 11111
• Publication date: 2019-09-09
• Acceptance date: 2019-08-01
• Event title: SPIE Optics + Photonics 2019
• Event location: San Diego, CA, United States
• Event website: https://optics.org/events/2019/798
• Event start date: 2019-08-11
• Event end date: 2019-08-15
• DOI: 10.1117/12.2528884
• EISSN: 1996-756X
• ISSN: 0277-786X
• ISBN: 9781510629158
• Language: English
• Keywords: germanium; X-ray lasers; neon; luminescence; potassium; plasmas; X-rays; chlorine; X-ray fluorescence spectroscopy; magnesium