4 May 2007 Towards an active real-time THz camera: first realization of a hybrid system
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Abstract
We report the realization of a hybrid system for stand-off THz reflectrometry measurements. The design combines the best of two worlds: the high radiation power of sub-THz micro-electronic emitters and the high sensitivity of coherent opto-electronic detection. Our system is based on a commercially available multiplied Gunn source with a cw output power of 0.6 mW at 0.65 THz. We combine it with electro-optic mixing with femtosecond light pulses in a ZnTe crystal. This scheme can be described as heterodyne detection with a Ti:sapphire fs-laser acting as local oscillator and therefore allows for phase-sensitive measurements. Example images of test objects are obtained with mechanical scanning optics and with measurement times per pixel as short as 10 ms. The test objects are placed at a distance of 1 m from the detector and also from the source. The results indicate diffraction-limited resolution. Different contrast mechanisms, based on absorption, scattering, and difference in optical thickness are employed. Our evaluation shows that it should be possible to realize a real-time multi-pixel detector with several hundreds of pixels and a dynamic range of at least two orders of magnitude in power.
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T. May, T. May, C. am Weg, C. am Weg, A. Alcin, A. Alcin, B. Hils, B. Hils, T. Löffler, T. Löffler, H. G. Roskos, H. G. Roskos, } "Towards an active real-time THz camera: first realization of a hybrid system", Proc. SPIE 6549, Terahertz for Military and Security Applications V, 654907 (4 May 2007); doi: 10.1117/12.719197; https://doi.org/10.1117/12.719197
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