Hexagonal polygon mirror based terahertz imaging system by using telecentric f-Θ lens

In this paper, we propose a high speed terahertz(THz) imaging system by using hexagonal polygon mirror. The system consists of a single emitter, detector, a hexagonal polygon mirror for scanning, and a telecentric f-θ lens for imaging. The THz wave from the emitter is two-dimensionally steered by a polygon mirror and irradiated to the object through a telecentric f-θ lens. The irradiated THz wave is reflected by the object and then returns to the detector in the same path as the optical path illuminated by the telecentric f-θ lens. In this process, when the THz wave goes out of the lens, the clock mirror extracts the clock signal for the image alignment processing.