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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2604.21236 |
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| _version_ | 1866914500935942144 |
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| author | S., Shreesha Rao D. Rampur, Anupamaa Bang, Ole Heidt, Alexander M. |
| author_facet | S., Shreesha Rao D. Rampur, Anupamaa Bang, Ole Heidt, Alexander M. |
| contents | We demonstrate, for the first time to our knowledge, ultra-low-noise supercontinuum (SC) generation in normal-dispersion fluoride fibres pumped by femtosecond (fs) pulses. We have investigated two elliptical-core polarisation-maintaining (PM) ZBLAN fibres with core dimensions 6.7$\times$2.7 $μ$m and 8.9$\times$4.1 $μ$m, experimentally measured to have normal dispersion up to 3.77 $μ$m and 3.25 $μ$m, respectively; the smaller-core fibre yields ultra-low-noise SC spanning 1.537-2.196 $μ$m with a minimum relative-intensity noise (RIN) of 0.22% at 1.7 $μ$m, and the larger-core fibre yields 1.507-2.250 $μ$m with 0.36% at 2.0 $μ$m. To aid the generation of low-noise SC, we developed an all-PM thulium chirped-pulse amplifier delivering 58 fs pulses at 1.85 $μ$m, 210 mW average power at 40 MHz, with 0.41% RIN, seeded by a part of an ultra-low-noise SC using a 1.55 $μ$m fs laser and an all-normal-dispersion (ANDi) silica fibre for precise seed control. These results establish a robust, alignment-free pathway to extend ultra-low-noise ANDi-fibre SC towards the mid-infrared using PM fluoride fibres. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_21236 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Ultra-low-noise supercontinuum in normal-dispersion ZBLAN fibres pumped at 1.85 $μ$m S., Shreesha Rao D. Rampur, Anupamaa Bang, Ole Heidt, Alexander M. Optics We demonstrate, for the first time to our knowledge, ultra-low-noise supercontinuum (SC) generation in normal-dispersion fluoride fibres pumped by femtosecond (fs) pulses. We have investigated two elliptical-core polarisation-maintaining (PM) ZBLAN fibres with core dimensions 6.7$\times$2.7 $μ$m and 8.9$\times$4.1 $μ$m, experimentally measured to have normal dispersion up to 3.77 $μ$m and 3.25 $μ$m, respectively; the smaller-core fibre yields ultra-low-noise SC spanning 1.537-2.196 $μ$m with a minimum relative-intensity noise (RIN) of 0.22% at 1.7 $μ$m, and the larger-core fibre yields 1.507-2.250 $μ$m with 0.36% at 2.0 $μ$m. To aid the generation of low-noise SC, we developed an all-PM thulium chirped-pulse amplifier delivering 58 fs pulses at 1.85 $μ$m, 210 mW average power at 40 MHz, with 0.41% RIN, seeded by a part of an ultra-low-noise SC using a 1.55 $μ$m fs laser and an all-normal-dispersion (ANDi) silica fibre for precise seed control. These results establish a robust, alignment-free pathway to extend ultra-low-noise ANDi-fibre SC towards the mid-infrared using PM fluoride fibres. |
| title | Ultra-low-noise supercontinuum in normal-dispersion ZBLAN fibres pumped at 1.85 $μ$m |
| topic | Optics |
| url | https://arxiv.org/abs/2604.21236 |