CW-THz vector spectroscopy and imaging system based on 1.55-µm fiber-optics

We present a continuous-wave terahertz (THz) vector spectroscopy and imaging system based on a 1.5-µm fiber optic uni-traveling-carrier photodiode and InGaAs photo-conductive receiver. Using electro-optic (EO) phase modulators for THz phase control with shortened optical paths, the system achieves f...

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Bibliographic Details
Published inOptics express Vol. 22; no. 2; pp. 1735 - 1741
Main Authors Kim, Jae-Young, Song, Ho-Jin, Yaita, Makoto, Hirata, Akihiko, Ajito, Katsuhiro
Format Journal Article
LanguageEnglish
Published United States 27.01.2014
Subjects
Equipment Design
Equipment Failure Analysis
Fiber Optic Technology - instrumentation
Micro-Electrical-Mechanical Systems - instrumentation
Molecular Imaging - instrumentation
Spectrophotometry, Infrared - instrumentation
Terahertz Imaging - instrumentation
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Summary:We present a continuous-wave terahertz (THz) vector spectroscopy and imaging system based on a 1.5-µm fiber optic uni-traveling-carrier photodiode and InGaAs photo-conductive receiver. Using electro-optic (EO) phase modulators for THz phase control with shortened optical paths, the system achieves fast vector measurement with effective phase stabilization. Dynamic ranges of 100 dB · Hz and 75 dB · Hz at 300 GHz and 1 THz, and phase stability of 1.5° per minute are obtained. With the simultaneous measurement of absorbance and relative permittivity, we demonstrate non-destructive analyses of pharmaceutical cocrystals inside tablets within a few minutes.
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ISSN:1094-4087
1094-4087
DOI:10.1364/oe.22.001735