DC response of an interferometer topology with an L-shaped cavity: a tabletop study
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866909994053533696 |
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| author | Li, Junlang Huang, Jiehong Guo, Xinyao Miao, Haixing Chen, Yuchao Huang, Xiaoman Pan, Yuan Zhou, Chenjie Flaminio, Raffaele Rollins, Jameson Graef Slagmolen, Bram Zhang, Fan Zhang, Teng Wang, Mengyao |
| author_facet | Li, Junlang Huang, Jiehong Guo, Xinyao Miao, Haixing Chen, Yuchao Huang, Xiaoman Pan, Yuan Zhou, Chenjie Flaminio, Raffaele Rollins, Jameson Graef Slagmolen, Bram Zhang, Fan Zhang, Teng Wang, Mengyao |
| contents | A new interferometer topology for kilohertz gravitational-wave detection was recently proposed in [Zhang et al. Phys. Rev. X 13, 021019 (2023)]. The design is based on an L-shaped optical cavity pumped through a Sagnac-like vortex. We report a tabletop experiment that characterizes the interferometer's optical response near DC. When the laser frequency is locked to the resonance of the L-shaped cavity, we observe that the cavity input coupler becomes effectively transparent, yielding a simple Michelson-like response. Moreover, the Sagnac vortex separates into upper and lower paths, which behave as two independent pumping paths driving the cavity. These observations are in agreement with theoretical predictions. Our results provide an intuitive physical picture of this interferometer topology and offer insight into its lock acquisition strategy. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_09764 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | DC response of an interferometer topology with an L-shaped cavity: a tabletop study Li, Junlang Huang, Jiehong Guo, Xinyao Miao, Haixing Chen, Yuchao Huang, Xiaoman Pan, Yuan Zhou, Chenjie Flaminio, Raffaele Rollins, Jameson Graef Slagmolen, Bram Zhang, Fan Zhang, Teng Wang, Mengyao Instrumentation and Detectors Instrumentation and Methods for Astrophysics General Relativity and Quantum Cosmology Optics A new interferometer topology for kilohertz gravitational-wave detection was recently proposed in [Zhang et al. Phys. Rev. X 13, 021019 (2023)]. The design is based on an L-shaped optical cavity pumped through a Sagnac-like vortex. We report a tabletop experiment that characterizes the interferometer's optical response near DC. When the laser frequency is locked to the resonance of the L-shaped cavity, we observe that the cavity input coupler becomes effectively transparent, yielding a simple Michelson-like response. Moreover, the Sagnac vortex separates into upper and lower paths, which behave as two independent pumping paths driving the cavity. These observations are in agreement with theoretical predictions. Our results provide an intuitive physical picture of this interferometer topology and offer insight into its lock acquisition strategy. |
| title | DC response of an interferometer topology with an L-shaped cavity: a tabletop study |
| topic | Instrumentation and Detectors Instrumentation and Methods for Astrophysics General Relativity and Quantum Cosmology Optics |
| url | https://arxiv.org/abs/2601.09764 |