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. 2015 Feb 13;5:8445. doi: 10.1038/srep08445

Figure 1. Schematic layout of the setup for continuous-wave terahertz in-line digital holography.

Figure 1

An output terahertz laser beam of 11 mm in diameter was expanded to 22 mm in diameter by using two gold-coated off-axis parabolic mirrors, PM1 and PM2, with effective focal lengths of 76.2 mm and 152.4 mm, respectively.