Journal
OPTICS EXPRESS
Volume 18, Issue 3, Pages 2872-2883Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.002872
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Funding
- Office of Naval Research
- National Science Foundation, DTRA
- Department of Homeland Security through the DHS-ALERT Center [2008-ST-061-ED0001]
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [0923353, 1237615] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [0852728] Funding Source: National Science Foundation
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When a sample being tested is optically opaque or has a high absorption coefficient, a reflective measurement is often more suitable than a transmission measurement. We report the design and evaluation of a reflective terahertz time-domain spectroscopy (R-THz-TDS), using air as THz wave emitter and sensor, together with air-biased-coherent-detection (ABCD) method for the first time. With an 85 fs pulse amplified laser, we demonstrate a usable bandwidth from 0.5 THz to 12 THz, together with a peak dynamic range (DR) better than 2000:1 and a peak THz electrical field greater than 30 kV/cm. With a 32 fs pulse amplified laser, the usable bandwidth is remarkably expanded to a continuous 35 THz. Several far-infrared optical properties in various samples are reported. Furthermore, the time-resolved optical pump-THz probe experiment is performed. Finally, the uniqueness and advantage of this spectrometer are comprehensively compared with traditional THz-TDS and Fourier transform infrared (FTIR) spectroscopy. (C) 2010 Optical Society of America
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