基于光学参量振荡器双光束的亚散粒噪声高灵敏度光谱学

Sub-shot-noise high-sensitivity spectroscopy with optical parametric oscillator twin beams.

作者信息

Ribeiro P H, Schwob C, Maître A, Fabre C

出版信息

Opt Lett. 1997 Dec 15;22(24):1893-5. doi: 10.1364/ol.22.001893.

DOI:10.1364/ol.22.001893

Abstract

Nondegenerate optical parametric oscillators generate above-threshold signal and idler beams that have intensity fluctuations correlated at the quantum level (twin beams). We describe what is to our knowledge the first high-sensitivity spectroscopy experiment using twin beams emitted by a cw optical parametric oscillator: a very weak two-photon absorption signal, in the 10(-7) range, is recorded on the 4S(1/2)-5S(1/2) transition of atomic potassium with a noise background that is reduced by 1.9 dB with respect to the shot-noise limit of the light used in the experiment.

摘要

非简并光学参量振荡器产生高于阈值的信号光束和闲频光束，它们在量子水平上具有强度涨落关联（孪生光束）。据我们所知，我们描述了首个使用连续波光参量振荡器发射的孪生光束进行的高灵敏度光谱实验：在原子钾的4S(1/2)-5S(1/2)跃迁上记录到一个非常微弱的双光子吸收信号，其处于10^(-7)范围，相对于实验中所用光的散粒噪声极限，噪声背景降低了1.9分贝。