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. Author manuscript; available in PMC: 2015 Jun 15.
Published in final edited form as: IEEE Trans Terahertz Sci Technol. 2011 Sep;1(1):201–219. doi: 10.1109/TTHZ.2011.2159551

Fig. 10.

Fig. 10

Optical characterization. (Left) Knife response of the spot size on target measured along the x-axis (as defined in Fig. 8). (Right) Depth of focus limited by the optical properties of the mirrors and feedhorn directivity.