Ion-Beam-Sputtered Mid-Infrared Coatings for Hybrid Supermirrors
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| author | Perner, Lukas W. Wittwer, Valentin J. Truong, Gar-Wing Cataño-Lopez, Seth B. Cole, Garrett D. Südmeyer, Thomas |
| author_facet | Perner, Lukas W. Wittwer, Valentin J. Truong, Gar-Wing Cataño-Lopez, Seth B. Cole, Garrett D. Südmeyer, Thomas |
| contents | We report on the development of low-loss ion-beam-sputtered (IBS) mid-infrared coatings for hybrid supermirrors. Two highly reflective designs were realized: HR1, a 4-period a-Si/SiO$_2$ DBR with an Al$_2$O$_3$ bonding layer, and HR2, a 6-period a-Si/Ta$_2$O$_5$ DBR with an a-Si terminating layer for bonding. Combined with a GaAs/AlGaAs crystalline mirror, HR2-based hybrids yielded a total loss of 9.3 ppm and excess loss of 6.8 ppm at 4.45 $μ$m, with cavity finesse up to 396000. For the first time, we used IBS-deposited a-Si directly as a bonding layer, verified its sub-angstrom roughness, and demonstrated excellent performance. This establishes a clear path toward scalable coatings for longer mid-infrared wavelengths, building on prior results in Nat. Commun. 14, 7846 (2023). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_21462 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Ion-Beam-Sputtered Mid-Infrared Coatings for Hybrid Supermirrors Perner, Lukas W. Wittwer, Valentin J. Truong, Gar-Wing Cataño-Lopez, Seth B. Cole, Garrett D. Südmeyer, Thomas Optics Applied Physics We report on the development of low-loss ion-beam-sputtered (IBS) mid-infrared coatings for hybrid supermirrors. Two highly reflective designs were realized: HR1, a 4-period a-Si/SiO$_2$ DBR with an Al$_2$O$_3$ bonding layer, and HR2, a 6-period a-Si/Ta$_2$O$_5$ DBR with an a-Si terminating layer for bonding. Combined with a GaAs/AlGaAs crystalline mirror, HR2-based hybrids yielded a total loss of 9.3 ppm and excess loss of 6.8 ppm at 4.45 $μ$m, with cavity finesse up to 396000. For the first time, we used IBS-deposited a-Si directly as a bonding layer, verified its sub-angstrom roughness, and demonstrated excellent performance. This establishes a clear path toward scalable coatings for longer mid-infrared wavelengths, building on prior results in Nat. Commun. 14, 7846 (2023). |
| title | Ion-Beam-Sputtered Mid-Infrared Coatings for Hybrid Supermirrors |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2508.21462 |