Continuous-wave terahertz self-referencing digital holography based on Fresnel's mirrors
Dayong Wang, Yaya Zhang, Lü Rong, Duoxuan Ma, Jie Zhao, Yunxin Wang
Abstract
Continuous-wave terahertz digital holography (TDH) is a booming full-field phase-contrast imaging method validated in both in-line and Mach-Zehnder off-axis geometries. In this Letter, a self-referencing TDH approach is proposed based on the Fresnel's mirrors, by which the object wavefront is partitioned and reflected. Two beams interfere with each other to form an off-axis hologram. The proposed recording configuration is immune from a superposed twin image and has higher temporal stability than Mach-Zehnder interferometers. To evaluate the phase-contrast imaging performance, different types of samples are measured.
Topics & Concepts
OpticsWavefrontHolographyTerahertz radiationDigital holographyPhysicsInterferometryAstronomical interferometerFresnel diffractionHolographic interferometryDigital holographic microscopyPhase (matter)Fresnel numberTalbot effectGratingQuantum mechanicsDiffractionDigital Holography and MicroscopyAdvanced Optical Imaging TechnologiesImage Processing Techniques and Applications