TY - JOUR
T1 - Shot-noise-limited doppler-broadened noise-immune cavity-enhanced optical heterodyne molecular spectrometry
AU - Zhao, Gang
AU - Hausmaninger, Thomas
AU - Ma, Weiguang
AU - Axner, Ove
N1 - Funding Information:
Vetenskapsrådet (VR) (2015-04374); National Natural Science Foundation of China (NSFC) (61675122). Gang thanks China Scholarship Council (CSC) for support.
Publisher Copyright:
© 2018 Optical Society of America
PY - 2018/2/1
Y1 - 2018/2/1
N2 - Shot-noise-limited Doppler-broadened (Db) noise-immune cavity-enhanced optical heterodyne molecular spectrometry (NICE-OHMS) has been realized by implementation of balanced detection. A characterization of the system based on Allan–Werle plots of the absorption coefficient, retrieved by fitting a model function to data, shows that the system has a white noise equivalent absorption per unit length per square root of bandwidth of 2.3 × 10−13 cm−1 Hz−1∕2, solely 44% above the shot noise limit, and a detection sensitivity of 2.2 × 10−14 cm−1 over 200 s, both being unprecedented for Db NICE-OHMS. The white noise response follows the expected inverse square root dependence on power that is representative of a shot-noise-limited response, which confirms that the system is shot-noise-limited.
AB - Shot-noise-limited Doppler-broadened (Db) noise-immune cavity-enhanced optical heterodyne molecular spectrometry (NICE-OHMS) has been realized by implementation of balanced detection. A characterization of the system based on Allan–Werle plots of the absorption coefficient, retrieved by fitting a model function to data, shows that the system has a white noise equivalent absorption per unit length per square root of bandwidth of 2.3 × 10−13 cm−1 Hz−1∕2, solely 44% above the shot noise limit, and a detection sensitivity of 2.2 × 10−14 cm−1 over 200 s, both being unprecedented for Db NICE-OHMS. The white noise response follows the expected inverse square root dependence on power that is representative of a shot-noise-limited response, which confirms that the system is shot-noise-limited.
UR - http://www.scopus.com/inward/record.url?scp=85042053622&partnerID=8YFLogxK
U2 - 10.1364/OL.43.000715
DO - 10.1364/OL.43.000715
M3 - Article
AN - SCOPUS:85042053622
VL - 43
SP - 715
EP - 718
JO - Optics Letters
JF - Optics Letters
SN - 0146-9592
IS - 4
ER -