Abstract
A prototype stationary Fourier transform spectrometer (FTS) was constructed
with a fiber-coupled lithium niobate (LiNbO3) waveguide Mach-Zehnder
interferometer (MZI) for the purpose of rapid on-site spectroscopy of biological and
chemical measurands. The MZI contains push-pull electrodes for electro-optic
modulation, and its interferogram as a plot of intensity against voltage was
obtained by scanning the modulating voltage from −60 to +60 V in 50 ms. The power
spectrum of input signal was retrieved by Fourier transform processing of the
interferogram combined with the wavelength dispersion of half-wave voltage
determined for the MZI used. The prototype FTS operates in the single-mode
wavelength range from 1200 to 1700 nm and allows for reproducible spectroscopy. A
linear concentration dependence of the absorbance at λmax = 1451 nm for
water in ethanolic solution was obtained using the prototype FTS. The near-infrared
spectroscopy of solid samples was also implemented, and the different spectra
obtained with different materials evidenced the chemical recognition capability of
the prototype FTS. To make this prototype FTS practically applicable, work on
improving its spectral resolution by increasing the maximum optical path length
difference is in progress.
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