The asymmetry of the detected profiles of water vapor absorption lines in a quartz tube at room temperature and pressures of 0.03–1.00 Torr was studied. The measurements were made by the method of diode laser spectroscopy with an external optical cavity. An off-axis alignment of the cavity was used for quality recording of narrow absorption line profiles. The measurements were made with different rates, 0.1–0.8 cm–1/ms, of tuning of the laser frequency with mirrors that have reflectivities of 99 and 99.98% and different directions of the laser frequency tuning. The asymmetry of the lines arises because of the time delay of the radiation inside the cavity. The results of modeling the measurements taking the filling of the cavity with laser light and its decay over time into account at the cavity output are in good agreement with experimental data.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 88, No. 3, pp. 373–377, May–June, 2021.
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Lagunov, V.V., Nikolaev, I.V. & Ochkin, V.N. Effect of the Frequency Tuning Rate of a Diode Laser on the Shape of an Absorption Line Profile During Measurement of Low Concentrations in an External Cavity With Off-Axis Radiation Input. J Appl Spectrosc 88, 496–500 (2021). https://doi.org/10.1007/s10812-021-01199-z
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DOI: https://doi.org/10.1007/s10812-021-01199-z