Laser diode photoacoustic and FTIR laser spectroscopy of formaldehyde in the 2.3 μm and 3.5 μm spectral range

Infrared diode laser spectroscopy

“…The idea to utilize the lasers as potential high−energy−level source of radiation for the absorption FT spectroscopy was published by Cihelka et al [26]. The amplitude of laser cur− rent was modulated by a sawtooth waveform modulation around its mean value.…”

“…This article summarises our previous investigations of the properties of the tunable laser diodes based on InAsSb/ InAsSbP [26][27][28][29][30][31][32][33][34][35] together with new type of the VCSE lasers working in the same spectral range [36]. The main purpose of this study is to present the simple physical methods that would permit to determine the widths of the spectral line of the lasers in dependence on the temperature and injection current and to discuss the factors influencing laser spectral linewidth.…”

Optical characterization of the VCSEL diodes based on GaSb

“…This work follows our previous studies, when the FTIR spectrometer [18] was used for the diagnostic of the room temperature operating a distributed Bragg reflector stripe GaInAsSb/AlGaAsSb based diode laser [15] and laser width of the 66 K InAsSb/InAsSbP laser diode [19][20][21].…”

Absolute absorption cross sections for two selected lines of formaldehyde around 6625cm−1

“…An excellent overview on data sets of absorption cross sections available in these wavelength ranges can be found at Gratien et al [13], who have conducted an intercomparison of the absorption cross sections in the two wavelength regions. In many laboratory studies, CH 2 O is quantified by either UV-absorption [2,[14][15][16] or using TDLAS in the infrared region [17][18][19][20].…”