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The HD absorption spectrum is investigated near 2.3μm with the help of a newly developed Cavity Ring Down Spectrometer (CRDS) using a VECSEL (Vertical External Cavity Surface Emitting Laser) as light source. The HD CRDS spectra were recorded for a series of ten pressure values in the range 50–650Torr. The sensitivity of the recordings – noise equivalent absorption of the spectra on the order of αmin...
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