Abstract

A dispersive grating compressor was included in a fiber ring laser to generate an unequally spaced frequency comb spanning $\sim 1549–1552\mathrm{nm}$. Beating of nearby modes in the comb naturally assigns unique amplitude modulation frequencies to each spectral component emitted. The source contains no moving parts. The single-mode fiber-coupled output is directed through hydrogen cyanide gas and detected by a photodiode. A Fourier transform of a $1\mathrm{ms}$ record yields a spectrum that agrees with results from a grating spectrometer at $0.06\mathrm{nm}$ resolution. By engineering stable, broadband combs, the technique could result in a universal and simple approach for spectroscopy at almost arbitrary measurement speeds and spectral resolutions limited only by Fourier principles.

© 2006 Optical Society of America

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