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arXiv · 2610.06477

Continuous-wave 148.4-nm generation in top-seeded solution-grown strontium tetraborate

Yanzhang Wu·Peng Yang·Lingfeng Yan·Qi Xiao·Jiahong Li·Juxian Li·Beichen Huang·Zhiwei Jiao·Shiqian Ding
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Abstract

We report an implementation of continuous-wave (CW) vacuum-ultraviolet (VUV) generation at 148.4 nm by single-pass second-harmonic generation of 296.8 nm light in strontium tetraborate (SBO). At an incident fundamental power of approximately 580~mW, we estimate a VUV output power of approximately 1.7 nW at the crystal exit. The crystal is grown by the top-seeded solution growth method and operated in a helium-filled chamber. The quadratic power dependence observed under vacuum, together with its strong suppression in air, supports the identification of the generated second harmonic. We further characterize the dependence of the VUV signal on beam position, incidence angle, polarization, and crystal temperature, providing practical guidance for SBO-based CW VUV sources for nuclear spectroscopy and clock applications.

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Yanzhang Wu, Peng Yang, Lingfeng Yan, Qi Xiao, Jiahong Li, Juxian Li, Beichen Huang, Zhiwei Jiao, Shiqian Ding. 2026-10-05. Continuous-wave 148.4-nm generation in top-seeded solution-grown strontium tetraborate. https://arxiv.org/abs/2610.06477

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