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A 2.7 $\mu$m Backward Wave Optical Parametric Oscillator Source for CO$_2$ Spectroscopy

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posted on 2024-05-22, 16:00 authored by Adrian Vågberg, Martin Brunzell, Max Widarsson, Patrick Mutter, Andrius Zukauskas, Fredrik Laurell, Valdas Pasiskevicius
In this study, we demonstrated the direct use of an inherently narrowband backward wave in the mid-infrared for CO$_2$ and H$_2$O vapor spectroscopy in ambient air. This wave is generated in a backward wave optical parametric oscillator (BWOPO) pumped by a multi longitudinal mode laser at 1030 nm, eliminating the need for additional spectral narrowing or wavelength stabilization. A full characterization of the source is presented, revealing a central output at 2712 nm, showcasing temperature tuning of -1.77 GHz/K, and achieving an output pulse energy of 2.3 $\mu$J. Novel methods are introduced for measuring the linewidth and wavelength stability using lab air. These approaches demonstrate a narrow output of 43 pm and establish an upper limit of stability at 65 MHz, with no active means of stabilization. These findings underscore the potential of BWOPOs as a robust platform for future DIAL systems.

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