Ultra-narrow linewidth laser across the C-band using polarization-controlled dual-cavity feedback
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arXiv
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866916654164738048 |
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| author | Surrow, Jeppe H. Thomsen, Simon T. Kumar, Rakesh R. Brusatori, Mónica Far Montes, Maria Paula Palsole, Ahan S. Hoede, Chris Klein, Holger N. Volet, Nicolas |
| author_facet | Surrow, Jeppe H. Thomsen, Simon T. Kumar, Rakesh R. Brusatori, Mónica Far Montes, Maria Paula Palsole, Ahan S. Hoede, Chris Klein, Holger N. Volet, Nicolas |
| contents | A standard method to reduce the linewidth of semiconductor lasers involves the use of external optical feedback (EOF). However, feedback powers less than 1 % usually trigger coherence collapse (CC), leading to chaotic laser dynamics and linewidth broadening. This paper explores a method to mitigate CC through precise tuning of the feedback polarization depending on the feedback power. We report a semiconductor laser with a sub-100 Hz intrinsic linewidth, achieved via EOF. The laser features a U-shaped cavity with two sampled grating distributed Bragg reflectors (SG-DBRs), enabling broad tunability across a 42 nm wavelength range (1513-1555 nm). By injecting optical feedback into both sides of the laser cavity via an external fiber-based cavity, we reduce the intrinsic linewidth by more than three orders of magnitude, from MHz to sub-kHz across the laser's tuning range. By dynamically tuning the polarization, we demonstrate sub-100 Hz intrinsic linewidths at feedback powers up to 10 %, marking an improvement over prior studies where CC limited performance. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_08621 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Ultra-narrow linewidth laser across the C-band using polarization-controlled dual-cavity feedback Surrow, Jeppe H. Thomsen, Simon T. Kumar, Rakesh R. Brusatori, Mónica Far Montes, Maria Paula Palsole, Ahan S. Hoede, Chris Klein, Holger N. Volet, Nicolas Optics A standard method to reduce the linewidth of semiconductor lasers involves the use of external optical feedback (EOF). However, feedback powers less than 1 % usually trigger coherence collapse (CC), leading to chaotic laser dynamics and linewidth broadening. This paper explores a method to mitigate CC through precise tuning of the feedback polarization depending on the feedback power. We report a semiconductor laser with a sub-100 Hz intrinsic linewidth, achieved via EOF. The laser features a U-shaped cavity with two sampled grating distributed Bragg reflectors (SG-DBRs), enabling broad tunability across a 42 nm wavelength range (1513-1555 nm). By injecting optical feedback into both sides of the laser cavity via an external fiber-based cavity, we reduce the intrinsic linewidth by more than three orders of magnitude, from MHz to sub-kHz across the laser's tuning range. By dynamically tuning the polarization, we demonstrate sub-100 Hz intrinsic linewidths at feedback powers up to 10 %, marking an improvement over prior studies where CC limited performance. |
| title | Ultra-narrow linewidth laser across the C-band using polarization-controlled dual-cavity feedback |
| topic | Optics |
| url | https://arxiv.org/abs/2410.08621 |