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- W2139482009 abstract "Quantum cascade lasers (QCLs) have attracted considerable interest as an alternative tuneable narrow bandwidth light source in the mid-infrared spectral range for chemical sensing. Pulsed QCL spectrometers are often used with short laser pulses and a bias current ramp similar to diode laser spectroscopy. Artefacts in the recorded spectra such as disturbed line shapes or underestimated absorption coefficients have been reported. A detailed time-resolved high-bandwidth analysis of individual pulses during a laser sweep has been performed. Quantitative results for CH4 absorption features around 1347 cm−1 (7.42 μm) fell short of the expected values for reasonable operating conditions of the QCL. The origin of the artefacts using short pulses was identified to be partly of the same nature as in the case of long laser pulses. A complex combination with the tuning principle was found, leading to an apparently increased instrumental broadening (effective line width) and underestimated concentrations at low-pressure conditions." @default.
- W2139482009 created "2016-06-24" @default.
- W2139482009 creator A5041185313 @default.
- W2139482009 creator A5071280432 @default.
- W2139482009 date "2010-06-19" @default.
- W2139482009 modified "2023-10-14" @default.
- W2139482009 title "Non-symmetrical line broadening effects using short-pulse QCL spectrometers as determined with sub-nanosecond time-resolution" @default.
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- W2139482009 doi "https://doi.org/10.1007/s00340-010-4093-8" @default.
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