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Synergy between laser linewidth and frequency chirp in mesospheric magnetometry based on the sodium laser guide star
Abstract
Mesospheric sodium magnetometry with a laser guide star measures the geomagnetic field near 90~km. Its sensitivity hinges on laser linewidth and chirp, yet prior work optimized these two parameters only separately. We use velocity-resolved density-matrix simulations of Larmor-synchronous pulsed Na D2 pumping to scan both parameters jointly. Linewidth and chirp exhibit a synergy: when chirping carries the recoil-mitigation role, the return flux stays within 1\% of its peak across linewidths of 2--10~MHz. The flux-optimal chirp is 0.19 MHz/upmu s, one fifth of the continuous-wave rate; this synergy guides high-sensitivity mesospheric magnetometer design.
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BibTeX
@misc{yang2026synergy,
title = {{Synergy between laser linewidth and frequency chirp in mesospheric magnetometry based on the sodium laser guide star}},
author = {Yucheng Yang and Chunyang Lei and Kai Guo and Shuai Wang},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2608.28466},
eprint = {2608.28466},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.28466},
}
RIS
TY - UNPB
TI - Synergy between laser linewidth and frequency chirp in mesospheric magnetometry based on the sodium laser guide star
AU - Yucheng Yang
AU - Chunyang Lei
AU - Kai Guo
AU - Shuai Wang
PY - 2026
DA - 2026/10/13
PB - arXiv
DO - 10.48550/arxiv.2608.28466
UR - https://arxiv.org/abs/2608.28466
AB - Mesospheric sodium magnetometry with a laser guide star measures the geomagnetic field near 90~km. Its sensitivity hinges on laser linewidth and chirp, yet prior work optimized these two parameters only separately. We use velocity-resolved density-matrix simulations of Larmor-synchronous pulsed Na D_2 pumping to scan both parameters jointly. Linewidth and chirp exhibit a synergy: when chirping carries the recoil-mitigation role, the return flux stays within 1\% of its peak across linewidths of 2--10~MHz. The flux-optimal chirp is 0.19 MHz/upmu s, one fifth of the continuous-wave rate; this synergy guides high-sensitivity mesospheric magnetometer design.
ER -