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Abstract
Dispersion spectroscopy based on frequency measurement of the high finesse optical cavity mode shifts induced by the presence of a gas medium with absorption resonances is an attractive alternative to standard absorptive spectroscopy. The main advantage of such pure frequency-based dispersive spectroscopy technique is the unique combination of sensitivity and accuracy. High sensitivity is ensured by high finesse optical cavities providing extremely long effective optical paths. On the other hand, high accuracy is provided by frequency measurement cavity mode shift. This makes this technique free from systematic errors coming from the non-linearity of light intensity measurements, which is one of the limiting factors in typical absorptive spectroscopy. We review several realizations of dispersive spectroscopy in high finesse optical cavities from Doppler-free to broadband. These techniques are especially useful for studying weak molecular transitions applicable in testing fundamental physics, gas metrology, spectroscopic thermometry, and a new generation of spectroscopic databases.
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1 Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń , ul. Grudziądzka 5, 87-100 Toruń, Poland
2 Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń , ul. Grudziądzka 5, 87-100 Toruń, Poland; National Metrology Institute of Japan (NMIJ) , National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan
3 Chemical Sciences Division, National Institute of Standards and Technology , 100 Bureau Drive, Gaithersburg, MD 20899, USA
4 Sensor Science Division, National Institute of Standards and Technology , 100 Bureau Drive, Gaithersburg, MD 20899, USA
5 Deutsches Elektronen-Synchrotron DESY , Notkestr. 85, 22607 Hamburg, Germany
6 Deutsches Elektronen-Synchrotron DESY , Notkestr. 85, 22607 Hamburg, Germany; Physics Department, Universität Hamburg UHH , Luruper Chaussee 149, 22761 Hamburg, Germany
7 CSEM - Swiss Center for Electronics and Microtechnology , 2000 Neuchâtel, Switzerland