title: CW-THz vector spectroscopy and imaging system based on 1.55-µm fiber-optics.
abstract: 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.
authors: Jae-Young
authors: JY
authors: Kim
authors: Ho-Jin
authors: HJ
authors: Song
authors: Makoto
authors: M
authors: Yaita
authors: Akihiko
authors: A
authors: Hirata
authors: Katsuhiro
authors: K
authors: Ajito
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D055617:Micro-Electrical-Mechanical Systems / Q000295:instrumentation*; D057054:Molecular Imaging / Q000295:instrumentation*; D013055:Spectrophotometry, Infrared / Q000295:instrumentation*; D055069:Terahertz Imaging / Q000295:instrumentation*