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(a) SolidWorks model of the optical system, where: ① THz Source, ② 50.8 mm clear aperture OAPs, ③ beam splitter, ④ scanning mirror, ⑤ 101.6 mm clear aperture OAPs, ⑥ target ball, ⑦ rotary step motor, ⑧ 3-axis translational stage, ⑨ detector. (b) Constructed system.
