Simultaneous detection of CO and CO2 using a semiconductor DFB diode laser at 1.578 μm

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and CO at a wavelength of λ=1578 nm. Sensitivity measurements under different conditions have been performed and the detection limit of the apparatus was measured to be less than 10 mTorr over a 1-m path length. In addition, we measured for the first time environmentally and spectroscopically relevant self-broadening and nitrogen-broadening coefficients for CO₂ and CO in this spectral region and we discuss different possibilities for increasing the sensitivity of the apparatus.