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27 September 2008 Design and analysis of quasi-optical THz time domain imaging systems
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A THz time domain imaging system is optimized and analyzed with ZEMAX. The requirements to the optical design of time domain imaging systems in the THz spectral region are deduced. A system is presented, which is diffraction-limited for wavelengths down to 838 μm and field points up to ±4 mm. In the optical system a 90° off-axis parabolic mirror is combined with an aspheric plastic lens. The lens was made from ZEONEX E48R®, and it was manufactured by ultraprecision machining. A resolution test of the system shows that on time domain analysis of the pulse maximum on-axis 1 LP/mm can be resolved with an intensity contrast of 0.22. The resolution of the outermost field point is 0.67 LP/mm with an intensity contrast of 0.23. An outlook of an optimized system for imaging a field of ±10 mm in x- and y-direction is given.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Claudia Brückner, Boris Pradarutti, Ralf Müller, Stefan Riehemann, Gunther Notni, and Andreas Tünnermann "Design and analysis of quasi-optical THz time domain imaging systems", Proc. SPIE 7100, Optical Design and Engineering III, 71000S (27 September 2008);


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