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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2403.14365 |
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| _version_ | 1866914875983265792 |
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| author | Llauze, Thomas Montjovet-Basset, Félix Louchet-Chauvet, Anne |
| author_facet | Llauze, Thomas Montjovet-Basset, Félix Louchet-Chauvet, Anne |
| contents | Achieving accurate arbitrary frequency excursions with a laser can be quite a technical challenge, especially when steep slopes (GHz/$μ$s) are required, due to both deterministic and stochastic frequency fluctuations. In this work we present a multi-stage correction combining four techniques: pre-distorsion of the laser modulation, iterative correction, opto-electronic feedback loop and feed-forward correction. This combination allows not only to compensate for the non-instantaneous response of the laser to an input modulation, but also to correct in real time the stochastic frequency fluctuations. We implement this multi-stage architecture on a commercial DBR laser and verify its efficiency, first with monochromatic operation and second with highly demanding frequency excursions. We demonstrate that our multi-stage correction not only enables a strong reduction of the laser linewidth, but also allows steep frequency excursions with a relative RMS frequency error well below $1$%, and a laser spectral purity consistently better than $100$~kHz even in the midst of GHz-scale frequency excursions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_14365 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Versatile, fast and accurate frequency excursions with a semiconductor laser Llauze, Thomas Montjovet-Basset, Félix Louchet-Chauvet, Anne Optics Achieving accurate arbitrary frequency excursions with a laser can be quite a technical challenge, especially when steep slopes (GHz/$μ$s) are required, due to both deterministic and stochastic frequency fluctuations. In this work we present a multi-stage correction combining four techniques: pre-distorsion of the laser modulation, iterative correction, opto-electronic feedback loop and feed-forward correction. This combination allows not only to compensate for the non-instantaneous response of the laser to an input modulation, but also to correct in real time the stochastic frequency fluctuations. We implement this multi-stage architecture on a commercial DBR laser and verify its efficiency, first with monochromatic operation and second with highly demanding frequency excursions. We demonstrate that our multi-stage correction not only enables a strong reduction of the laser linewidth, but also allows steep frequency excursions with a relative RMS frequency error well below $1$%, and a laser spectral purity consistently better than $100$~kHz even in the midst of GHz-scale frequency excursions. |
| title | Versatile, fast and accurate frequency excursions with a semiconductor laser |
| topic | Optics |
| url | https://arxiv.org/abs/2403.14365 |