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 Title: High-resolution Comb-based Fourier Transform Spectroscopy In The 3.3 μm And 7.8 μm Range Author(s): Foltynowicz, Aleksandra Contributor(s): Soboń, Grzegorz; Tomaszewska, Dorota; Gluszek, Aleksander; Hudzikowski, Arkadiusz; Krzempek, Karol; Stuhr, Michael; Sadiek, Ibrahim; Senna Vieira, Francisco; Lu, Chuang; Germann, Matthias; Hjältén, Adrian Subject(s): Instrument/Technique Demonstration Abstract: We use Fourier transform spectrometers based on mid-infrared frequency combs to measure and analyze broadband spectra of molecules of environmental importance in the two water windows around 3.3 $\mu$m and 7.8 $\mu$m. Both comb sources are based on difference frequency generation (DFG) using signal and pump waves derived from a single femtosecond laser, and are therefore inherently carrier-envelope-offset-free, which simplifies their frequency stabilization [1,2]. We use the sub-nominal sampling-interleaving method to measure spectra with resolution limited by the comb-mode linewidth [3,4]. At 3.3 $\mu$m, we measured high-resolution spectra of multiple absorption bands of two halogenated volatile organic compounds, methyl iodide, CH$_3$I [5], and dibromomethane, CH$_2$Br$_2$. We assigned the $\nu$$_4 band of CH_3I with improved accuracy compared to previous work based on FTIR measurements [6]. At 7.8 \mum, we measured the spectrum of the \nu$$_1$ band of $^{14}$N$_2$$^{16}$O and retrieved line center frequencies with precision of the order of 100 kHz [7], in excellent agreement with previous high-accuracy measurement using a comb-referenced continuous wave quantum cascade laser [8]. [1] G. Sobon et al., Opt. Lett. 42, 1748 (2017). [2] K. Krzempek et al., Opt. Express 27, 37435 (2019). [3] P. Maslowski et al., Phys. Rev. A 93, 021802(R) (2016). [4] L. Rutkowski et al., J. Quant. Spectrosc. Radiat. Transf. 204, 63 (2018). [5] I. Sadiek et al., J. Quant. Spectrosc. Radiat. Transf. 255, 107263, 107263 (2020). [6] R. Anttila et al., J. Mol. Spectrosc. 119, 190 (1986). [7] A. Hjältén et al., in preparation. [8] B. AlSaif, et al., J. Quant. Spectrosc. Radiat. Transf. 211, 172 (2018). Issue Date: 2021-06-22 Publisher: International Symposium on Molecular Spectroscopy Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/111247 Date Available in IDEALS: 2021-09-24
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