Free Space Optical Frequency Comparison Over Rapidly Moving Links
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arXiv
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| Autores principales: | , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866917962394370048 |
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| author | McSorley, Shawn M. P. Dix-Matthews, Benjamin P. Frost, Alex M. McCann, Ayden S. Karpathakis, Skevos F. E. Gozzard, David R. Walsh, Shane M. Schediwy, Sascha W. |
| author_facet | McSorley, Shawn M. P. Dix-Matthews, Benjamin P. Frost, Alex M. McCann, Ayden S. Karpathakis, Skevos F. E. Gozzard, David R. Walsh, Shane M. Schediwy, Sascha W. |
| contents | The comparison of optical reference frequency signals over free-space optical links is limited by the relative motion between local and remote sites. For ground to low earth orbit comparison, the expected Doppler shift and Doppler rate typically reach 4 GHz at 100 MHz/s, which prevents the narrow-band detection required to compare optical frequencies at the highest levels of stability. We demonstrate a system capable of optical frequency comparison in the presence of these significant Doppler shifts, using an electro-optic phase modulator with an actuation bandwidth of 10 GHz, which will enable ground-to-space frequency comparison. This system was demonstrated over a retro-reflected drone link, with a maximum line-of-sight velocity of 15 m/s and Doppler shift of 19 MHz at a Doppler rate of 1 MHz/s. The best fractional frequency stability obtained was 7E-18 at an integration time of 5s. These results are an important step toward ground to low earth orbit optical frequency comparison, providing a scalable terrestrial test bed. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_08899 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Free Space Optical Frequency Comparison Over Rapidly Moving Links McSorley, Shawn M. P. Dix-Matthews, Benjamin P. Frost, Alex M. McCann, Ayden S. Karpathakis, Skevos F. E. Gozzard, David R. Walsh, Shane M. Schediwy, Sascha W. Instrumentation and Detectors Optics The comparison of optical reference frequency signals over free-space optical links is limited by the relative motion between local and remote sites. For ground to low earth orbit comparison, the expected Doppler shift and Doppler rate typically reach 4 GHz at 100 MHz/s, which prevents the narrow-band detection required to compare optical frequencies at the highest levels of stability. We demonstrate a system capable of optical frequency comparison in the presence of these significant Doppler shifts, using an electro-optic phase modulator with an actuation bandwidth of 10 GHz, which will enable ground-to-space frequency comparison. This system was demonstrated over a retro-reflected drone link, with a maximum line-of-sight velocity of 15 m/s and Doppler shift of 19 MHz at a Doppler rate of 1 MHz/s. The best fractional frequency stability obtained was 7E-18 at an integration time of 5s. These results are an important step toward ground to low earth orbit optical frequency comparison, providing a scalable terrestrial test bed. |
| title | Free Space Optical Frequency Comparison Over Rapidly Moving Links |
| topic | Instrumentation and Detectors Optics |
| url | https://arxiv.org/abs/2402.08899 |