2024-08-13 サンディア国立研究所(SNL)
＜関連情報＞
- https://newsreleases.sandia.gov/motion_sensor/
- https://www.science.org/doi/full/10.1126/sciadv.ade4454
冷原子干渉計のための高性能シリコンフォトニック・シングルサイドバンド変調器 High-performance silicon photonic single-sideband modulators for cold-atom interferometry
Ashok Kodigala, Michael Gehl, Gregory W. Hoth, Jongmin Lee, […], and Anthony L. Lentine
Science Advances Published:10 Jul 2024
DOI:https://doi.org/10.1126/sciadv.ade4454
Abstract
The laser system is the most complex component of a light-pulse atom interferometer (LPAI), controlling frequencies and intensities of multiple laser beams to configure quantum gravity and inertial sensors. Its main functions include cold-atom generation, state preparation, state-selective detection, and generating a coherent two-photon process for the light-pulse sequence. To achieve substantial miniaturization and ruggedization, we integrate key laser system functions onto a photonic integrated circuit. Our study focuses on a high-performance silicon photonic suppressed-carrier single-sideband (SC-SSB) modulator at 1560 nanometers, capable of dynamic frequency shifting within the LPAI. By independently controlling radio frequency (RF) channels, we achieve 30-decibel carrier suppression and unprecedented 47.8-decibel sideband suppression at peak conversion efficiency of −6.846 decibels (20.7%). We investigate imbalances in both amplitudes and phases between the RF signals. Using this modulator, we demonstrate cold-atom generation, state-selective detection, and atom interferometer fringes to estimate gravitational acceleration, g ≈ 9.77 ± 0.01 meters per second squared, in a rubidium (87Rb) atom system.
