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31 May 2013Employing phase modulation and second harmonic nulling to eliminate the interference fringes from the spectrum of a portable coherent frequency-domain THz spectrometer
Interpreting the spectrum from a continuous wave frequency domain terahertz spectrometer that employs coherent
detection can be challenging due to the presence of an interference pattern. We report on the continued progress of a
portable, battery-operated frequency domain terahertz spectrometer with an integrated, fiber-coupled, lithium-niobate
optical phase-modulator and how we achieve interference fringe elimination using phase modulation and second
harmonic nulling. The implications for both transmission and reflection measurements are discussed and data on the
explosive compound RDX will be presented.
Joseph R. Demers andBryon L. Kasper
"Employing phase modulation and second harmonic nulling to eliminate the interference fringes from the spectrum of a portable coherent frequency-domain THz spectrometer", Proc. SPIE 8716, Terahertz Physics, Devices, and Systems VII: Advanced Applications in Industry and Defense, 87160M (31 May 2013); https://doi.org/10.1117/12.2016054
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Joseph R. Demers, Bryon L. Kasper, "Employing phase modulation and second harmonic nulling to eliminate the interference fringes from the spectrum of a portable coherent frequency-domain THz spectrometer," Proc. SPIE 8716, Terahertz Physics, Devices, and Systems VII: Advanced Applications in Industry and Defense, 87160M (31 May 2013); https://doi.org/10.1117/12.2016054