Parallel Session: Fundamental, Contributed Talk (15min)

Doppler-free saturation spectra of weak CO2 and O2 transitions

S. Wójtewicz1, K. Bielska1, J. Domysławska1, A. Balashov1,2, M. Słowiński1, M. Bober1, R. Ciuryło1, D. Lisak1
1Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Torun, Grudziadzka 5, 87-100 Torun, Poland, 2Institute of Applied Physics of the Russian Academy of Sciences, Ulyanov str. 46, 603950 Nizhny Novgorod, Russia

We present the Doppler-free saturated-absorption Lamb dip measurements of the CO2 30012-00001 (1570 nm) as well as O2 B band (690 nm) transitions. The spectra, measured at pressures ranging from about 0.3 to 20 Pa, were collected using three techniques: cavity ring-down spectroscopy (CRDS) [1], cavity mode-width spectroscopy (CMWS) [2], and cavity mode dispersion spectroscopy (CMDS) [3]. The spectrometers were linked to an optical frequency comb referenced to a hydrogen maser [4,5]. The retrieved line positions are characterized by uncertainties at the level of several kHz. The Doppler-free saturation spectra of magnetic dipole molecular transitions (O2 B band) were measured for the first time. The results are compared with the available data [6, 7].

[1] D. A. Long, A. Cygan, R. D. van Zee, M. Okumura, C. E. Miller, D. Lisak, J. T. Hodges, Chem. Phys. Lett., 2021, 536, 1.
[2] A. Cygan, D. Lisak, P. Morzyński, M. Bober, M. Zawada, E. Pazderski, R. Ciuryło, Opt. Express, 2013, 21, 29744.
[3] A. Cygan, P. Wcisło, S. Wójtewicz, P. Masłowski, J. T. Hodges, R. Ciuryło, D. Lisak, Opt. Express, 2015, 23, 14472.
[4] A. Cygan, S. Wójtewicz, G. Kowzan, M. Zaborowski, P. Wcisło, J. Nawrocki, P. Krehlik, Ł. Śliwczyński, M. Lipiński, P. Masłowski, R. Ciuryło, D. Lisak, J. Chem. Phys., 2016 144, 214202.
[5] A. Cygan, P. Wcisło, S. Wójtewicz, G. Kowzan, M. Zaborowski, D. Charczun, K. Bielska, R. S. Trawiński, R. Ciuryło, P. Masłowski, D. Lisak, Opt. Express, 2019, 27, 21810.
[6] J. Domysławska, S. Wójtewicz, P. Masłowski, A. Cygan, K. Bielska, R. S. Trawiński, R. Ciuryło, D. Lisak, J. Quant. Spectrosc. Radiat. Transfer, 2016, 169, 111.
[7] D. A. Long, S. Wójtewicz, C. E. Miller, J.T.Hodges, J. Quant. Spectrosc. Radiat. Transfer, 2015, 161, 35.