444.2 nm蓝光半导体泵浦掺镨氟化钇锂晶体连续351 mW输出275 nm紫外激光器

275 nm ultraviolet laser with 351 mW continuous-wave output in a Pr:YLF laser pumped by a blue laser diode at 444.2 nm

1.
Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
2.
Changchun New Industries Optoelectronics Technology Co. Ltd., Changchun 130012, China

Funds: Supported by Science and Technology Development Plan of Jilin Province (No. 20230201062GX)

摘要:
本文创新性地采用蓝光半导体泵浦掺镨氟化钇锂晶体产生550 nm激光，并通过高效倍频技术，获得275 nm连续紫外激光输出。采用全新的快轴准直的蓝光半导体激光器作为泵浦源，结合折叠腔和新颖的镀膜技术，并采用布切的BBO晶体进行腔内倍频，获得了351 mW的275 nm基模深紫外激光输出。目前为止，这是首次基于掺镨氟化钇锂获得275 nm激光的报道。
- 连续紫外激光器 /
- 275 nm激光器 /
- 掺镨氟化钇锂晶体 /
- 倍频技术
Abstract:
This paper describes what is thought to be the first generation of a continuous wave deep ultraviolet laser at 275 nm by efficient frequency doubling of a blue-diode-pumped Pr:YLF laser at 550 nm. By employing a novel fast-axis collimated blue semiconductor laser as the pump source, combined with a folded cavity and innovation coating technology, and utilizing a Brewster-cut BBO crystal for intracavity frequency doubling, TEM₀₀ mode deep UV laser radiation at 275 nm with an output power of 351 mW is obtained. This marks the first report of achieving 275 nm laser generation based on Pr:LiYF₄ to date.
- CW ultraviolet laser /
- 275 nm laser /
- Pr:YLF /
- frequency doubling

Figure 1. Schematic of the 275 nm laser

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Figure 2. The energy level and room temperature polarization-dependent emission Pr:YLF cross-sections

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Figure 3. Pr:YLF fluorescence spectrum from 500 nm to 570 nm

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Figure 4. Focusing shape and size of pump beam spot with a fast-axis collimating blue diode

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Figure 5. M₂ coating curve (short-wave-pass)

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Figure 6. M₃ coating curve (long-wave-pass)

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Figure 7. The output power of 275 nm versus the incident pump power

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Figure 8. 275 nm laser spectrum

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Figure 9. The beam spot and M-square of the 275 nm laser

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Figure 10. 275 nm laser power stability

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