Time-domain near-infrared spectroscopy using a wavelength-tunable narrow-linewidth source by spectral compression of ultrashort soliton pulses

Abstract

Time-domain absorption spectroscopy was demonstrated using a wideband, rapid wavelength-tunable, narrow-linewidth source based on an Er-doped ultrashort pulse fiber laser system. The spectrum of the Raman-shifted ultrashort soliton pulse was compressed using a comb-profile dispersion increasing fiber. Rapid wavelength sweeping was demonstrated using an electro-optical intensity modulator. The absorption spectrum of ${\mathrm{CH}}_2{\mathrm{Cl}}_2$ liquid at $1625–1780\mathrm{nm}$ was observed in a $10\mathrm{\mu s}$ time-domain measurement.

© 2011 Optical Society of America

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