Abstract

We present the design and expected performance of a Fourier-transform fiber-optic Raman spectrometer that should be capable of rapidly diagnosing environmental contamination to levels approaching a few parts per thousand. The system design is predicated on fiber arms that are unequal in length initially. A voltage applied to the piezoceramic substrate hosting the shorter fiber strains it through zero path difference to a new length that exceeds the reference arm by its initial length deficiency. This approach permits one to resolve spectral features separated by 0.5 cm^-1 over an electromagnetic bandwidth that exceeds 2000 cm^-1 without using a moving mirror or introducing a second laser to provide the sampling reference. Specific expressions are given for computing the spectral resolution, modulation bandwidth, and modulated signal-to-noise ratio of the device as a function of the system’s design parameters.

© 1997 Optical Society of America

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