Doppler-induced continuous spectral broadening of ultraviolet lasers
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arXiv
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866917156825858048 |
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| author | Wu, Huanhuan Liu, Yuhan Zhong, Shengqiang Yi, Yaozhi Lin, Zhuwen Yin, Hongwei Xu, Yilin Yang, Fan Jiang, Xiantao Zhao, Yao |
| author_facet | Wu, Huanhuan Liu, Yuhan Zhong, Shengqiang Yi, Yaozhi Lin, Zhuwen Yin, Hongwei Xu, Yilin Yang, Fan Jiang, Xiantao Zhao, Yao |
| contents | We propose a compact scheme based on ultrafast-rotating phase plates (URPPs) to achieve continuous spectral broadening of ultraviolet lasers. The rapid rotation elements behave as a random oscillator which induces Doppler frequency shift into the ultraviolet lasers. As an example, for a disk-shaped phase plate, with the beam acting on the edge at a radius of 10 cm, a rotation frequency of 1 kHz, and a phase-element size of 10 nm, the continuous spectral broadening reaches 0.07%. Further increasing the rotation speed or reducing the phase-element can lead to greater spectral broadening. When multiple URPPs are arranged in series, the superimposed spatiotemporal modulation further enhances the continuous spectral broadening and achieves more effective speckle smoothing. The scheme is applicable to broadening the independent spectrum of optical frequency combs as well as to the mitigation of laser-plasma instabilities in inertial fusion energy. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_17176 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Doppler-induced continuous spectral broadening of ultraviolet lasers Wu, Huanhuan Liu, Yuhan Zhong, Shengqiang Yi, Yaozhi Lin, Zhuwen Yin, Hongwei Xu, Yilin Yang, Fan Jiang, Xiantao Zhao, Yao Optics Plasma Physics We propose a compact scheme based on ultrafast-rotating phase plates (URPPs) to achieve continuous spectral broadening of ultraviolet lasers. The rapid rotation elements behave as a random oscillator which induces Doppler frequency shift into the ultraviolet lasers. As an example, for a disk-shaped phase plate, with the beam acting on the edge at a radius of 10 cm, a rotation frequency of 1 kHz, and a phase-element size of 10 nm, the continuous spectral broadening reaches 0.07%. Further increasing the rotation speed or reducing the phase-element can lead to greater spectral broadening. When multiple URPPs are arranged in series, the superimposed spatiotemporal modulation further enhances the continuous spectral broadening and achieves more effective speckle smoothing. The scheme is applicable to broadening the independent spectrum of optical frequency combs as well as to the mitigation of laser-plasma instabilities in inertial fusion energy. |
| title | Doppler-induced continuous spectral broadening of ultraviolet lasers |
| topic | Optics Plasma Physics |
| url | https://arxiv.org/abs/2512.17176 |