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

查看全文 作　　者：Alireza [1]Khorsandi;Zahra [1]Shabani;Monireh [1]Ranjbar;S. Ali Hoseinzadeh [1]Salati

机构地区：[1]Department of Physics,University of Isfahan,81746-73441 Isfahan,Iran

出　　处：《Chinese Physics B》索引2012年第21卷第6期,共7页

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：跟踪检测一氧化碳激光源应用差频二极管激光器非线性晶体特性

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

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