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Title:DIRECT FREQUENCY COMB SPECTROSCOPY WITH AN 8.5 μm OPO
Author(s):Iwakuni, Kana
Contributor(s):Ye, Jun; Sukegawa, Takashi; Weichman, Marissa L.; Changala, Bryan; Niedermeyer, Justin; Bui, Thinh Quoc
Subject(s):Mini-symposium: Frequency-Comb Spectroscopy
Abstract:Direct frequency comb spectroscopy provides high-resolution spectra over a broad bandwidth. Its high sensitivity has also enabled real time detection for gas sensing and chemical reaction kinetics\footnote{T. Q. Bui, B. J. Bjork, P. B. Changala, T. L. Nguyen, J. F. Stanton, M. Okumura, J. Ye, Direct measurements of DOCO isomers in the kinetics of OD+CO, Science Advances, 4, eaao4777 (2018)}. Previous work has focused in the near-infrared or mid-infrared (1 - 5 $\mu$m), but there are stronger absorption lines in the $>$5 $\mu$m wavelength region. In addition, at longer wavelengths spectral congestion is significantly reduced owing to the decreasing strength of intramolecular vibrational energy redistribution. We have developed a new frequency comb spectrometer within 8.5 – 9.5 $\mu$m. The light source is a synchronously pumped optical parametric oscillator (OPO)-based frequency comb using a 2 $\mu$m Tm fiber comb as the pump wave. In direct frequency comb spectroscopy, several options exist to read out the spectrum, such as FTIR or highly dispersive optics like a virtually-imaged phased array (VIPA)\footnote{L. Nugent-Glandorf, T. Neely, F. Adler, A. J. Fleisher, K. C. Cossel, B. Bjork, T. Dinneen, J. Ye, S. A. Diddams, Mid-infrared virtually imaged phased array spectrometer for rapid and broadband trace gas detection, Opt. Lett. 37, 3285 (2012)}. In this work, an immersion grating and a reflective grating are used as cross dispersers and each comb mode is mapped to a 2D image in the same way as a VIPA spectrometer. Immersion gratings have been applied in astronomy and have resolving power ($\lambda$/$\Delta$$\lambda$) exceeding 10$^5$, which is suitable for high-resolution real-time comb spectroscopy. We report work done with this new spectrometer.
Issue Date:06/20/18
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:APS
Genre:Conference Paper / Presentation
Type:Text
Language:English
URI:http://hdl.handle.net/2142/100479
DOI:10.15278/isms.2018.WA06
Other Identifier(s):WA06
Date Available in IDEALS:2018-08-17
2018-12-12


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