Open AccessHigh-precision cavity spectroscopy using high-frequency squeezed light
Author(s) -
J. Junker,
D. Wilken,
Elanor H. Huntington,
M. Heurs
Publication year - 2021
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.416713
Subject(s) - optics , spectroscopy , noise (video) , physics , laser , frequency modulation , signal (programming language) , quantum limit , quantum noise , limit (mathematics) , shot noise , noise floor , materials science , acoustics , quantum , noise measurement , radio frequency , computer science , noise reduction , telecommunications , mathematical analysis , mathematics , quantum mechanics , artificial intelligence , detector , image (mathematics) , programming language
In this article, we present a novel spectroscopy technique that improves the signal-to-shot-noise ratio without the need to increase the laser power. Detrimental effects by technical noise sources are avoided by frequency-modulation techniques (frequency up-shifting). Superimposing the signal on non-classical states of light leads to a reduced quantum noise floor. Our method reveals in a proof-of-concept experiment small signals at Hz to kHz frequencies even below the shot noise limit. Our theoretical calculations fully support our experimental findings. The proposed technique is interesting for applications such as high-precision cavity spectroscopy, e.g., for explosive trace gas detection where the specific gas might set an upper limit for the laser power employed.