Continuous-wave laser source at the 148 nm nuclear transition of Th-229

Abstract

A continuous-wave laser source at 148.4 nm based on second-harmonic generation in randomly quasi-phase matched strontium tetraborate, SrB4O7, is demonstrated. It provides (1.3-0.6+0.7) nW of VUV power in a single pass for an incident UV laser power of 325 mW. The laser system is developed for the resonant laser excitation of the 229Th nucleus to its low-energy isomeric state. For a frequency-stabilized laser system we expect to reach similar VUV power spectral densities as in previous pulsed laser excitation experiments of the nuclear transition in 229Th-doped crystals.

5 pages

References in corpus (5)

• Frequency ratio of the ${}^{229\mathrm{m}}$Th nuclear isomeric transition and the ${}^{87}$Sr atomic clock
• Proposal for a Nuclear Gamma-Ray Laser of Optical Range
• ${}^{229}{\mathrm{ThF}}_4$ thin films for solid-state nuclear clocks
• A full breakthrough in vacuum ultraviolet nonlinear optical performance of NH4B4O6F
• Frequency reproducibility of solid-state Th-229 nuclear clocks

Cited by in corpus (1)

• A continuous-wave vacuum ultraviolet laser for the nuclear clock