Effect of broadband amplified spontaneous emission on absorption measurements in phase-shift off-axis cavity enhanced absorption spectroscopy

This figure shows calculated areas under 12CO2R(2) absorption line versus concentration for 5% CO2 in nitrogen at different pressures and temperature 295 K: squares - spectra processed with correction on amplified spontaneous emission (ASE) and linear fit (solid line); circles - spectra processed without ASE correction and linear fit (dashed line).