Application and characterization of large-format IR focal-plane arrays as detectors for ultrafast, high-resolution IR spectroscopy are discussed. We also present generation of broadband IR probe–reference pulses by use of collinear non-phase-matched geometry and shot-to-shot dual-track normalization to obtain transient spectra from broadly absorbing hydrogen-bonded systems. As much as 400-cm<sup>-1</sup>-wide coverage with 15-cm<sup>-1</sup> FWHM spectral resolution and ±6.4 × 10<sup>-4</sup>(ΔOD = 3 × 10<sup>-4</sup>) baseline standard deviation (±1σs) is demonstrated near 2.9 µm.
© 1997 Optical Society of America
S. M. Arrivo, V. D. Kleiman, T. P. Dougherty, and E. J. Heilweil, "Broadband femtosecond transient infrared spectroscopy using a 256 x 256 element indium antimonide focal-plane detector," Opt. Lett. 22, 1488-1490 (1997)