太赫兹同轴数字全息成像是基于太赫兹波干涉记录的一种新型成像技术，具有光源相干性要求低、光路结构简单、成像分辨率高、实时定量获取物光波复振幅信息等特点，非常适用于太赫兹波段成像。搭建了一套连续太赫兹波同轴数字全息成像装置，通过全息图预处理和相位恢复算法，获取了样品的振幅和相衬图像，有效抑制了共轭像，并进一步探索了太赫兹同轴数字全息技术在生物医学检测上的可行性。

Terahertz (THz)-wave in-line digital holography imaging is a new imaging technique based on interferometry record of terahertz wave. It exhibits advantages for the THz imaging because it only needs low coherence light source a simple optical structure, and has high resolution imaging and access to quantitative real-time complex complitude of light wave. We built a continuous-wave THz in-line digital holographic setup. By preprocessing hologram and phase recovery algorithm, we obtain amplitude and phase contrast images of the sample and effectively inhibit the conjugate image. Further, the feasibility of THz in-line digital holography is explored in biomedical detection.