Application of a characterized difference-frequency laser source to carbon monoxide trace detection

doi:10.1088/1674-1056/21/6/064213

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.

Keywords: difference-frequency generation AgGaS₂ crystal multi-pass cell

Received: 24 October 2011
Revised: 10 December 2011
Accepted manuscript online:

PACS:	42.62.Fi	(Laser spectroscopy)
	42.65.-k	(Nonlinear optics)

Corresponding Authors: Alireza Khorsandi
E-mail: a.khorsandi@phys.ui.ac.ir

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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