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THz up-conversion spectrum measurement system based on OH1 crystal. PBS: polarizing beam splitter; HWP: half-wave plate; OAPs: off-axis parabolic mirrors; BIE: beam isolation enhancer; PD: photodetector; iris: aperture; The red arrows represent the optical paths of NIR light λ1; The blue arrows represent the optical paths of the NIR light λ2; The yellow area represents the THz transmission path; The green arrows represent the optical paths of the pump source with wavelength of 532 nm.
