Abstract

Supercontinua generated in highly nonlinear 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 in the near-infrared region are reported. 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 1×105 times higher than that of a 3000 K blackbody and 102 times higher than that of synchrotron radiation. The C2H2 and NH3 overtone spectra are recorded by using this source within a few seconds.

© 2008 Optical Society of America

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