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Design and analysis of quasi-optical THz time domain imaging systems

: Brückner, C.; Pradarutti, B.; Müller, R.; Riehemann, S.; Notni, G.; Tünnermann, A.


Mazuray, L. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Europe, Cardiff:
Optical design and engineering III : 2 - 5 September 2008, Glasgow, United Kingdom
Bellingham, WA: SPIE, 2008 (SPIE Proceedings Series 7100)
ISBN: 978-0-8194-7330-1
ISSN: 0277-786X
Paper 71000S
Conference "Optical Design and Engineering" <2008, Glasgow>
Fraunhofer IOF ()

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.