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Q: Fachverband Quantenoptik und Photonik

Q 22: Nuclear and X-Ray Quantum Optics

Q 22.3: Vortrag

Dienstag, 3. März 2026, 11:45–12:00, P 11

Coherent vortex pulse propagation in ²²⁹Th:CaF₂ — •Alexander Franz, Tobias Kirschbaum, and Adriana Pálffy — Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany

In recent years, the isomeric transition in ²²⁹Th has emerged as a promising candidate for the development of a nuclear clock [1]. One of the possible approaches for realizing such a clock involves embedding ²²⁹Th nuclei into VUV-transparent crystals. In this work, we investigate from theoretical side the driving of the nuclear clock transition in ²²⁹Th-doped crystals using Bessel beams, a form of light with helical wavefronts and spatial degrees of freedom. Due to the magnetic dipole character of the clock transition, such beams offer new control degrees of freedom compared to standard plane waves [2]. We study nuclear forward scattering of a resonant Bessel beam pulse propagating through the crystal, analyzing the resulting temporal and spatial intensity patterns. To this end, we extend an existing formalism developed for plane waves to Bessel beams [3]. We consider scenarios involving a single nuclear transition and multiple simultaneously driven transitions, as well as different orientations of the quantization axis. This approach opens a way to determine the relative distribution of different directions of quantization axes inside the crystal.

[1] C. Zhang et al., Nature 633, 63-70 (2024).

[2] T. Kirschbaum et al., Phys. Rev. C 5, 064326 (2024).

[3] Y. V. Shvyd’ko, Phys. Rev. B 59 9132 (1999).

Keywords: Nuclear clock; Twisted light; VUV light