title: Applying light-emitting diodes with narrowband emission features in differential spectroscopy.
abstract: LEDs are a promising new type of light source for differential optical absorption spectroscopy (DOAS). Varying differential structures in the emission spectrum of LEDs, however, display a potentially severe problem. We show that the structures, which originate from a Fabry-Pérot etalon, may be removed by tilting the emitter, which at the same time increases the radiant flux coupled into the subsequent optical system. The results of long-path DOAS measurements, where we apply our method on a blue LED for the suppression of periodic structures, are also presented.
authors: Institute of Environmental Physics, University of Heidelberg, Im Neuenheimer Feld 229,D-69120 Heidelberg, Germany. holger.sihler@iup.uni-heidelberg.de
authors: Holger
authors: H
authors: Sihler
authors: Christoph
authors: C
authors: Kern
authors: Denis
authors: D
authors: Pöhler
authors: Ulrich
authors: U
authors: Platt