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Line-shape study of water vapour by tunable diode laser spectrometer in the 822–832 nm wavelength region

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Abstract

A near-infrared tunable diode laser absorption spectrometer is set up to measure the air-induced broadening coefficients and the line-strength parameters of water-vapour overtone transitions within the (2,1,1)←(0,0,0) band in the 822–832 nm wavelength region. A Hitachi HL8311 E double hetero-junction structure diode laser is used as a probe. The diode laser controller is home-built and stable within ±10 μA and ±10 mK, respectively. The laser-head mount has a simple design and provides easy access whenever changing of the laser head is required. The diode laser emission wavelength is thermally tuned between 50 °C and 12 °C. Thermal tuning of the diode laser emission wavelength is used to reveal the mode structure of the diode laser and to probe the overtone-band transitions of water vapour within its operating wavelength range. Current tuning of the diode laser is used at a fixed laser temperature to study the transitions one at a time. A balanced detector is used to improve the S/N ratio of the spectrum. A phase sensitive detection technique is followed to obtain the first-derivative spectra of the overtone transitions. The first-derivative spectra have been recorded at different air pressures inside the sample cell while the water-vapour pressure is kept fixed. The first-derivative spectrum is numerically integrated to obtain the original line shape. The original line shape is fitted with a Voigt profile by using a nonlinear least-squares fit program to extract the air-broadening coefficient and the line-strength parameter. The data obtained in our work is compared with the results of the HITRAN database.

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Authors and Affiliations

  1. Department of Physics, University of Calcutta, 92, APC Road, Calcutta, 700 009, India

    A. Ray, A. Bandyopadhyay, B. Ray & P.N. Ghosh

  2. Department of Physics, Jadavpur University, Jadavpur, Calcutta, 700 032, India

    D. Biswas

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  1. A. Ray
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  2. A. Bandyopadhyay
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  3. B. Ray
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  4. D. Biswas
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  5. P.N. Ghosh
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Correspondence to P.N. Ghosh.

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PACS

33.70.-w; 33.70.Fd; 33.70.Jg

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Ray, A., Bandyopadhyay, A., Ray, B. et al. Line-shape study of water vapour by tunable diode laser spectrometer in the 822–832 nm wavelength region. Appl Phys B 79, 915–921 (2004). https://doi.org/10.1007/s00340-004-1643-y

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  • DOI: https://doi.org/10.1007/s00340-004-1643-y

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