Continuous-wave 148.4-nm generation in strontium tetraborate for nuclear absorption spectroscopy
Abstract
Continuous-wave light near 148.4 nm enables direct absorption spectroscopy of the thorium-229 nuclear transition. We demonstrate single-pass frequency doubling in strontium tetraborate, delivering an estimated 8.1 nW at 920 mW pump power. At this power, oxygen admission leaves a background of 1.22 kHz, corresponding to an estimated signal-to-background ratio of 3.8 x 10^4 after current-integration calibration. Several crystals grown by top-seeded solution growth produce polarization-dependent VUV signals. Temperature scans reveal distinct maxima among specimens cut from one boule and among positions within a specimen. The source sustains operation over 33.3 h. In a separate 3-h record acquired with 1-ms gates, local referencing achieves near-Poisson averaging, reaching a fractional Allan deviation of 3.5 x 10^-5 at 1000 s. These results establish a practical VUV source for stable, long-duration spectroscopy of weak nuclear absorption.
Related
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BibTeX
@misc{wang2026continuouswave,
title = {{Continuous-wave 148.4-nm generation in strontium tetraborate for nuclear absorption spectroscopy}},
author = {Hanlin Wang and Zhouzhi Tan and Conghui Huang and Jinming Liu and Xuan Fan and Runzhe Yang and Meng Wang and Tung-Hsun Chung and Yong-Heng Huo and Yin Hang and Zhiwei Jiao and Heng Tu and Lei Zhang and Xu-Fei Yin and Pengfei Wang and Zhiqiang Zhang},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.18470},
eprint = {2610.18470},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.18470},
}
RIS
TY - UNPB
TI - Continuous-wave 148.4-nm generation in strontium tetraborate for nuclear absorption spectroscopy
AU - Hanlin Wang
AU - Zhouzhi Tan
AU - Conghui Huang
AU - Jinming Liu
AU - Xuan Fan
AU - Runzhe Yang
AU - Meng Wang
AU - Tung-Hsun Chung
AU - Yong-Heng Huo
AU - Yin Hang
AU - Zhiwei Jiao
AU - Heng Tu
AU - Lei Zhang
AU - Xu-Fei Yin
AU - Pengfei Wang
AU - Zhiqiang Zhang
PY - 2026
DA - 2026/10/13
PB - arXiv
DO - 10.48550/arxiv.2610.18470
UR - https://arxiv.org/abs/2610.18470
AB - Continuous-wave light near 148.4 nm enables direct absorption spectroscopy of the thorium-229 nuclear transition. We demonstrate single-pass frequency doubling in strontium tetraborate, delivering an estimated 8.1 nW at 920 mW pump power. At this power, oxygen admission leaves a background of 1.22 kHz, corresponding to an estimated signal-to-background ratio of 3.8 x 10^4 after current-integration calibration. Several crystals grown by top-seeded solution growth produce polarization-dependent VUV signals. Temperature scans reveal distinct maxima among specimens cut from one boule and among positions within a specimen. The source sustains operation over 33.3 h. In a separate 3-h record acquired with 1-ms gates, local referencing achieves near-Poisson averaging, reaching a fractional Allan deviation of 3.5 x 10^-5 at 1000 s. These results establish a practical VUV source for stable, long-duration spectroscopy of weak nuclear absorption.
ER -