Abstract
We describe a setup that allows for the measurement of high-quality images at frequencies in the far-infrared (THz) regime of the spectrum. By using water-cooled THz emitters that are biased with a 50-kHz, ±400-V square wave, rapid delay scanning, and differential lock-in detection at 50 kHz, we attain shot-noise-limited detection of THz transients. As a result, THz transients with a large dynamic range of ∼5000 can be measured in 20 ms. We show that the THz imaging setup enables the time-resolved detection of the diffusion of gases.
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07.57.-c; 42.30.-d; 95.85.Gn; 36.20.Ng
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Planken, P., Bakker, H. Towards time-resolved THz imaging. Appl Phys A 78, 465–469 (2004). https://doi.org/10.1007/s00339-003-2405-0
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DOI: https://doi.org/10.1007/s00339-003-2405-0