NOVEL ALL-FIBER-OPTIC FOURIER-TRANSFORM SPECTROMETER WITH THERMALLY SCANNED INTERFEROMETER

A novel Fourier-transform spectrometer based on optical fibres (FO-FTS ) was constructed. The optical retardation between the arms of a Mach- Zehnder type interferometer made of a single-mode optical fibre is mod ulated by variation of the fibre temperature. Spectra of a multimode l aser diode and a broad-band light source were recorded. Coherent avera ging of multiple interferograms was successfully applied to enhance th e signal-to-noise ratio of the interferograms. Application of the FO-F TS to chemically selective imaging of surfaces is proposed.