Concepts for direct frequency-comb spectroscopy of $^{229\text{m}}$Th and an internal-conversion-based solid-state nuclear clock · HackerPapers discussionshttps://hackerpaper.kaipfister.de/p/1905.08060/Collected HN comments and submissions linking this paper.enMon, 02 Nov 2026 11:16:22 GMTConcepts for direct frequency-comb spectroscopy of $^{229\text{m}}$Th and an internal-conversion-based solid-state nuclear clock — mentioned by fshhttps://news.ycombinator.com/item?id=20956146urn:hackerpapers:mention:1905.08060:20956146Thu, 12 Sep 2019 20:34:38 GMT<p>Unfortunately, the stated transition wavelength of 149.7 ± 3.1 nm is well outside the range where practical laser sources exist. There is a proposal for driving the transition with a vacuum ultra-violet frequency comb generated by high harmonic generation [1], but such systems easily fill a lab with no clear path for miniaturization. [1] https://arxiv.org/abs/1905.08060</p><p><a href="https://hackerpaper.kaipfister.de/p/1905.08060/">Paper and discussion history</a>. A mention is not an endorsement.</p>physics.ins-det