Terahertz (THz) digital holography is realized based on a 2.52 THz far-IR gas laser and a commercial 124×124 pyroelectric array camera. Off-axis THz holograms are obtained by recording interference patterns between light passing through the sample and the reference wave. A numerical reconstruction process is performed to obtain the field distribution at the object surface. Different targets were imaged to test the system’s imaging capability. Compared with THz focal plane images, the image quality of the reconstructed images are improved a lot. The results show that the system’s imaging resolution can reach at least 0.4 mm. The system also has the potential for real-time imaging application. This study confirms that digital holography is a promising technique for real-time, high-resolution THz imaging, which has extensive application prospects.
© 2011 Optical Society of America
Original Manuscript: March 3, 2011
Revised Manuscript: April 19, 2011
Manuscript Accepted: April 21, 2011
Published: May 23, 2011
Sheng-Hui Ding, Qi Li, Yun-Da Li, and Qi Wang, "Continuous-wave terahertz digital holography by use of a pyroelectric array camera," Opt. Lett. 36, 1993-1995 (2011)