July 2021
Spotlight Summary by Alexander Grabtchikov
Improvement of the coherent model function for S-branch Raman linewidth determination in oxygen
Coherent anti-Stokes Raman spectroscopy (CARS) is an interesting spectroscopic method born in the 1970s that continues to develop in our days. The method keeps evolving due to the need for a deeper characterization of the environment, as well as unique fundamental possibilities when combining the Raman scattering effect with modern laser methods. The article by J. Holzer and colleagues gives an excellent example of detailed theoretical and experimental considerations of the next steps in the application of CARS for rotational spectroscopy of oxygen. The characterization of oxygen is important for studying combustion and many other processes. The authors aimed for low concentration measurements of oxygen. The work focused on measuring the S-branch Raman linewidth, which is widely used for investigations of combustion and thermodynamic properties. The characterization is done by means of picosecond time-resolved CARS measurements, which is complicated due to additional temporal beatings arising during the coherence decay. A new description of the coherent model, taking into account coherent beating in the S-branch signal, is proposed. Calculations using the model demonstrate good correlation with experimental data. As a result, low-signal oxygen data are presented, a new improved accuracy level in measurement of rotation S-branch Raman linewidths is demonstrated, and new exciting perspectives for transient Raman spectroscopy could be explored in future work.
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Article Information
Improvement of the coherent model function for S-branch Raman linewidth determination in oxygen
Jonas I. Hölzer, Christian Meißner, and Thomas Seeger
Appl. Opt. 60(15) C76-C83 (2021) View: Abstract | HTML | PDF