Integrating high-precision and fringe-scale displacement sensing using heterodyne cavity-tracking
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| Main Authors: | , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866915126617047040 |
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| author | Subrahmanya, Shreevathsa Chalathadka Darsow-Fromm, Christian Gerberding, Oliver |
| author_facet | Subrahmanya, Shreevathsa Chalathadka Darsow-Fromm, Christian Gerberding, Oliver |
| contents | We present a heterodyne stabilized cavity-based interferometer scheme that can serve as a compact and high-sensitivity displacement sensor with a fringe-scale operating range. The technique, in principle, can reach a sub-femtometer noise floor and an operating range on the order of one laser wavelength at $λ\approx 1\,μm$. With our current experimental setup, we achieve a sensitivity of about $260 fm/\sqrt{\mathrm{Hz}}$ at $1\,Hz$ and $46 fm/\sqrt{\mathrm{Hz}}$ at around $130\,Hz$. By probing a length actuated cavity, we demonstrate six orders of magnitude of dynamic range for displacement measurement, reaching a maximum motion of $0.15\,μm$. The tracking bandwidth and displacement range are limited by analog effects in the signal digitization and are extendable in the future. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2408_12350 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Integrating high-precision and fringe-scale displacement sensing using heterodyne cavity-tracking Subrahmanya, Shreevathsa Chalathadka Darsow-Fromm, Christian Gerberding, Oliver Optics Instrumentation and Detectors We present a heterodyne stabilized cavity-based interferometer scheme that can serve as a compact and high-sensitivity displacement sensor with a fringe-scale operating range. The technique, in principle, can reach a sub-femtometer noise floor and an operating range on the order of one laser wavelength at $λ\approx 1\,μm$. With our current experimental setup, we achieve a sensitivity of about $260 fm/\sqrt{\mathrm{Hz}}$ at $1\,Hz$ and $46 fm/\sqrt{\mathrm{Hz}}$ at around $130\,Hz$. By probing a length actuated cavity, we demonstrate six orders of magnitude of dynamic range for displacement measurement, reaching a maximum motion of $0.15\,μm$. The tracking bandwidth and displacement range are limited by analog effects in the signal digitization and are extendable in the future. |
| title | Integrating high-precision and fringe-scale displacement sensing using heterodyne cavity-tracking |
| topic | Optics Instrumentation and Detectors |
| url | https://arxiv.org/abs/2408.12350 |