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Application of a characterized difference-frequency laser source to carbon monoxide trace detection |
Alireza Khorsandi†, Zahra Shabani, Monireh Ranjbar, and S. Ali Hoseinzadeh Salati |
Department of Physics, University of Isfahan, 81746-73441 Isfahan, Iran |
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Abstract A tunable continuous wave (cw) mid-infrared (MIR) laser based on difference-frequency generation (DFG) in a 1.5-cm long AgGaS2 nonlinear crystal for trace gas detection is reported. Two visible and near-infrared diode lasers were used as pump and signal sources. The MIR-DFG laser was tunable in a wavelength range of 4.75 μm-4.88 μm. The phase-matching (PM) condition was non-critically achieved by adjusting the temperature of the crystal for fixed pairs of input pump and signal wavelengths. The required PM temperatures of the generated MIR-DFG wavelengths have been calculated by using three sets of recent Sellmeier equations and the temperature-dispersion equations of AgGaS2 given by Willer U, et al. (Willer U, Blanke T and Schade W 2001 Appl. Opt. 40 5439). Then the calculated PM temperatures are compared with the experimental values. The performance of the MIR-DFG laser is shown by the trace detection of the P(16) carbon monoxide (12C16O) absorption line in a laboratory-fabricated absorption cell. The enhanced sensitivity of about 0.6 × 10-4 was obtained through the long path absorption provided by consecutive reflections between coated cylindrical mirrors of a constructed cell.
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Received: 24 October 2011
Revised: 10 December 2011
Accepted manuscript online:
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PACS:
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42.62.Fi
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(Laser spectroscopy)
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42.65.-k
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(Nonlinear optics)
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Corresponding Authors:
Alireza Khorsandi
E-mail: a.khorsandi@phys.ui.ac.ir
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Cite this article:
Alireza Khorsandi, Zahra Shabani, Monireh Ranjbar, and S. Ali Hoseinzadeh Salati Application of a characterized difference-frequency laser source to carbon monoxide trace detection 2012 Chin. Phys. B 21 064213
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