Supercontinua for high resolution absorption multiplex infrared spectroscopy
Abstract
Supercontinua generated in highly non-linear fibers by ultrashort-pulse lasers can be used for high resolution Fourier transform absorption spectroscopy. The practical advantages of these bright ultrabroadband light sources for spectroscopy are reported in the near-infrared region. A Cr4+:YAG femtosecond laser broadened by an extruded soft-glass photonic crystal fiber, emitting from 1200 to 2200 nm and from 675 to 950 nm, provides a spectral radiance being 1x105 times higher than that of a 3000 K blackbody and 102 times higher than that of a synchrotron radiation. The C2H2 and NH3 overtone spectra are recorded using this source within a few seconds.
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