We demonstrate quasi-optical, diffraction-limited two-dimensional image pro
duction by means of reflected pulses of terahertz (THz) radiation. A spheri
cal mirror is used to form a real one-to-one THz image of two 1-mm-diameter
steel spheres, which is then scanned over a THz receiver. Diffraction-limi
ted spatial (cross-range) resolution and THz pulse range resolution are sim
ultaneously observed. (C) 2001 Optical Society of America.