Abstract
High-power distributed-feedback (DFB) lasers for the wavelength range near 940 nm (i.e. about 10,600 cm−1) were used for line-broadening measurements of individual rotational-vibrational absorption lines of water vapour at atmospheric pressure using a minimalist set-up. The laser has a maximum output power larger than 500 mW. Over the whole power range from threshold to maximum power, it operates in single mode operation with a tuning range of 4.7 nm, i.e. 50 cm−1, at 20°C. With an emission line-width ≤2 MHz (0.66×10−4 cm−1), the device is well suited for high-resolution spectroscopy.
Instead using a sophisticated optical set-up with a multi-reflection cell to obtain the necessary path length for measuring rather weak absorption lines, in this work a 4″ integrating sphere was used as a multi-reflection cell providing an effective absorption length of 6.7 m. The laser was placed without any optical elements in front of the entrance hole.
The power-current-characteristics, the spectral features of the diode laser, and examples for the spectral tuning will be given. In the spectral range from 10,584.3 cm−1 to 10,670.2 cm−1, line broadening coefficients in the range \(0.059~\mbox{cm}^{-1}/\mbox{atm} \leq \gamma_{\scriptsize\mbox{H$_{2}$O--air}} \leq 0.112~\mbox{cm}^{-1}/\mbox{atm}\) were measured for 18 H2O absorption lines from the 2ν 1+ν 3-band and 7 H2O lines from the 3ν 1-band. The good agreement of the measured air-broadening coefficients with data from the literature for absorption lines with a J″≤4 and \(K_{a}'' \leq 3\) proves the applicability of this low-cost set-up. Some deviations between the literature and this work were observed for lines from the 2ν 1+ν 3-band with larger J″>4 and \(K_{a}'' = 3\).
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Sumpf, B., Klehr, A., Erbert, G. et al. Application of 940 nm high-power DFB lasers for line-broadening measurements at normal pressure using a robust and compact setup. Appl. Phys. B 106, 357–364 (2012). https://doi.org/10.1007/s00340-011-4745-3
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DOI: https://doi.org/10.1007/s00340-011-4745-3