Yellow whispering-gallery-mode lasing from amorphous fluoride microspheres
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arXiv
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866915927417683968 |
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| author | Sureshkumar, Abhishek Demaimay, Jonathan Perin, Georges Velly, Christelle Ollivier, Héléne Dumeige, Yannick Braud, Alain Camy, Patrice Trebaol, Stéphane Loiko, Pavel |
| author_facet | Sureshkumar, Abhishek Demaimay, Jonathan Perin, Georges Velly, Christelle Ollivier, Héléne Dumeige, Yannick Braud, Alain Camy, Patrice Trebaol, Stéphane Loiko, Pavel |
| contents | Compact, low-noise coherent light sources in the visible remain challenging due to limited gain platforms and inefficient pumping. We report a new route to visible microlasing based on direct, one-photon blue pumping and an amorphous fluoride gain material platform. Dysprosium doped fluoride microspheres are fabricated via plasma-torch-induced, pressureless amorphization of single crystals, enabling compositions beyond conventional glass-forming limits while ensuring ultrasmooth morphology, low phonon energy, and homogeneous dopant distribution. We demonstrate the first fiber-coupled whispering-gallery-mode lasing from an amorphous fluoride microsphere in the yellow (573 nm), with an ultralow threshold of $190 μ$W despite spin-forbidden Dy$^{3+}$ transitions. Lasing is evidenced by characteristic light-light curve indicating a low spontaneous emission factor, narrow-linewidth emission, and relaxation oscillations yielding a loaded quality factor of $Q = 3.5 \times 10^6$. This platform is readily extendable to other rare-earth emitters, enabling entire visible spectral coverage beyond the limitations of upconversion pumping, with prospects for color-tunable and white-light emission. Finally, fiber-based amplification of the WGM signal demonstrates a pathway toward compact, fiber-integrated visible microlasers with controllable noise and linewidth. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_08269 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Yellow whispering-gallery-mode lasing from amorphous fluoride microspheres Sureshkumar, Abhishek Demaimay, Jonathan Perin, Georges Velly, Christelle Ollivier, Héléne Dumeige, Yannick Braud, Alain Camy, Patrice Trebaol, Stéphane Loiko, Pavel Optics Compact, low-noise coherent light sources in the visible remain challenging due to limited gain platforms and inefficient pumping. We report a new route to visible microlasing based on direct, one-photon blue pumping and an amorphous fluoride gain material platform. Dysprosium doped fluoride microspheres are fabricated via plasma-torch-induced, pressureless amorphization of single crystals, enabling compositions beyond conventional glass-forming limits while ensuring ultrasmooth morphology, low phonon energy, and homogeneous dopant distribution. We demonstrate the first fiber-coupled whispering-gallery-mode lasing from an amorphous fluoride microsphere in the yellow (573 nm), with an ultralow threshold of $190 μ$W despite spin-forbidden Dy$^{3+}$ transitions. Lasing is evidenced by characteristic light-light curve indicating a low spontaneous emission factor, narrow-linewidth emission, and relaxation oscillations yielding a loaded quality factor of $Q = 3.5 \times 10^6$. This platform is readily extendable to other rare-earth emitters, enabling entire visible spectral coverage beyond the limitations of upconversion pumping, with prospects for color-tunable and white-light emission. Finally, fiber-based amplification of the WGM signal demonstrates a pathway toward compact, fiber-integrated visible microlasers with controllable noise and linewidth. |
| title | Yellow whispering-gallery-mode lasing from amorphous fluoride microspheres |
| topic | Optics |
| url | https://arxiv.org/abs/2604.08269 |