Tian-peng Hua, Yu Robert Sun, Jin Wang, Chang-le Hu, Lei-gang Tao, An-wen Liu, Shui-ming Hu. Cavity-Enhanced Saturation Spectroscopy of Molecules with sub-kHz Accuracy[J]. Chinese Journal of Chemical Physics , 2019, 32(1): 107-112. doi: 10.1063/1674-0068/cjcp1812272
Citation: Tian-peng Hua, Yu Robert Sun, Jin Wang, Chang-le Hu, Lei-gang Tao, An-wen Liu, Shui-ming Hu. Cavity-Enhanced Saturation Spectroscopy of Molecules with sub-kHz Accuracy[J]. Chinese Journal of Chemical Physics , 2019, 32(1): 107-112. doi: 10.1063/1674-0068/cjcp1812272

Cavity-Enhanced Saturation Spectroscopy of Molecules with sub-kHz Accuracy

doi: 10.1063/1674-0068/cjcp1812272
Funds:  This work was supported by the National Natural Science Foundation of China (No.21688102, No.91436209, and No.21427804), and the Chinese Academy of Science (No.XDB21020100).
  • Received Date: 2018-12-01
  • Saturation spectroscopy is frequently used to obtain sub-Doppler measurement of atomic and molecular transitions. Optical resonant cavities can be used to enhance the effective absorption path length, and the laser power inside the cavity as well to saturate very weak ro-vibrational transitions of molecules. Three different cavity-enhanced methods, cavity enhanced absorption spectroscopy, cavity ring-down spectroscopy, and noise-immune cavity enhanced optical heterodyne molecular spectroscopy (NICE-OHMS), were compared by measuring the Lamb dip of a C2H2 line at 1.4 μm using a cavity with a finesse of 120000. The center of the line was determined by different cavity-enhanced methods, each giving a sub-kHz (δv/v≈10-12) statistical uncertainty. The sensitivity and precision of different methods were analyzed and compared. As demonstrated in this study, the NICE-OHMS method is the most sensitive one, but more investigation on the systematic uncertainty is necessary before its application in metrology studies toward a sub-kHz accuracy.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Cavity-Enhanced Saturation Spectroscopy of Molecules with sub-kHz Accuracy

doi: 10.1063/1674-0068/cjcp1812272
Funds:  This work was supported by the National Natural Science Foundation of China (No.21688102, No.91436209, and No.21427804), and the Chinese Academy of Science (No.XDB21020100).

Abstract: Saturation spectroscopy is frequently used to obtain sub-Doppler measurement of atomic and molecular transitions. Optical resonant cavities can be used to enhance the effective absorption path length, and the laser power inside the cavity as well to saturate very weak ro-vibrational transitions of molecules. Three different cavity-enhanced methods, cavity enhanced absorption spectroscopy, cavity ring-down spectroscopy, and noise-immune cavity enhanced optical heterodyne molecular spectroscopy (NICE-OHMS), were compared by measuring the Lamb dip of a C2H2 line at 1.4 μm using a cavity with a finesse of 120000. The center of the line was determined by different cavity-enhanced methods, each giving a sub-kHz (δv/v≈10-12) statistical uncertainty. The sensitivity and precision of different methods were analyzed and compared. As demonstrated in this study, the NICE-OHMS method is the most sensitive one, but more investigation on the systematic uncertainty is necessary before its application in metrology studies toward a sub-kHz accuracy.

Tian-peng Hua, Yu Robert Sun, Jin Wang, Chang-le Hu, Lei-gang Tao, An-wen Liu, Shui-ming Hu. Cavity-Enhanced Saturation Spectroscopy of Molecules with sub-kHz Accuracy[J]. Chinese Journal of Chemical Physics , 2019, 32(1): 107-112. doi: 10.1063/1674-0068/cjcp1812272
Citation: Tian-peng Hua, Yu Robert Sun, Jin Wang, Chang-le Hu, Lei-gang Tao, An-wen Liu, Shui-ming Hu. Cavity-Enhanced Saturation Spectroscopy of Molecules with sub-kHz Accuracy[J]. Chinese Journal of Chemical Physics , 2019, 32(1): 107-112. doi: 10.1063/1674-0068/cjcp1812272

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