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22 May 2015 Video rate imaging at 1.5 THz via frequency upconversion to the near-IR
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We demonstrate video rate THz imaging in both reflection and transmission by frequency upconverting the THz image to the near-IR. In reflection, the ability to resolve images generated at different depths is shown. By mixing the THz pulses with a portion of the fiber laser pump (1064 nm) in a quasi-phase matched gallium arsenide crystal, distinct sidebands are observed at 1058 nm and 1070 nm, corresponding to sum and difference frequency generation of the pump pulse with the THz pulse. By using a polarizer and long pass filter, the strong pump light can be removed, leaving a nearly background free signal at 1070 nm. We have obtained video rate images with spatial resolution of 1mm and field of view ca. 20 mm in diameter without any post processing of the data.
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Patrick F. Tekavec, Vladimir G. Kozlov, Ian McNee, Yun-Shik Lee, and Konstantin Vodopyanov "Video rate imaging at 1.5 THz via frequency upconversion to the near-IR", Proc. SPIE 9467, Micro- and Nanotechnology Sensors, Systems, and Applications VII, 94672F (22 May 2015);

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