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

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

中国物理B ›› 2012, Vol. 21 ›› Issue (6): 64213-064213.doi: 10.1088/1674-1056/21/6/064213

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

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

Alireza Khorsandi, Zahra Shabani, Monireh Ranjbar, S. Ali Hoseinzadeh Salati

Department of Physics, University of Isfahan, 81746-73441 Isfahan, Iran

收稿日期:2011-10-24 修回日期:2011-12-10 出版日期:2012-05-01 发布日期:2012-05-01

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

Received:2011-10-24 Revised:2011-12-10 Online:2012-05-01 Published:2012-05-01
Contact: Alireza Khorsandi E-mail:a.khorsandi@phys.ui.ac.ir

摘要/Abstract

摘要： 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.

关键词: difference-frequency generation, AgGaS₂ crystal, multi-pass cell

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.

Key words: difference-frequency generation, AgGaS₂ crystal, multi-pass cell

中图分类号: (Laser spectroscopy)

42.62.Fi

42.65.-k (Nonlinear optics)

Alireza Khorsandi, Zahra Shabani, Monireh Ranjbar, S. Ali Hoseinzadeh Salati. Application of a characterized difference-frequency laser source to carbon monoxide trace detection[J]. 中国物理B, 2012, 21(6): 64213-064213.

Alireza Khorsandi, Zahra Shabani, Monireh Ranjbar, and S. Ali Hoseinzadeh Salati . Application of a characterized difference-frequency laser source to carbon monoxide trace detection[J]. Chin. Phys. B, 2012, 21(6): 64213-064213.

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

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

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