We describe an efficient and compact terahertz (THz) illumination system as part of an active THz imager. The design and fabrication methods are verified by comparing measurements with wave optical simulations that form a basis for the design of a Gaussian-to-tophat beam shaper. Introducing realistic alignment tolerances in the simulations led to an improved agreement with the experimental data. Furthermore, we propose a method to reduce the alignment effort for THz beam shaping elements by correlating measured results with simulated data of a misaligned system.
© 2010 Optical Society of America
Optical Design and Fabrication
Original Manuscript: January 6, 2010
Manuscript Accepted: February 14, 2010
Published: March 24, 2010
Roman Kleindienst, Lothar Moeller, and Stefan Sinzinger, "Highly efficient refractive Gaussian-to-tophat beam shaper for compact terahertz imager," Appl. Opt. 49, 1757-1763 (2010)