Abstract

The study of coherent noise suppression in digital holographic microscopy (DHM) is an important issue in fields of both engineering and biological science [1]. In usual DHM, optical sources with long coherent lengths such as He-Ne laser has been widely used to feature the sample. Because of the high degree of coherence of the He-Ne laser light, harmful coherent noise often arises [2]. This noise affects on the quality of the holograms and hence leads to error in phase measurement. Optical sources with short coherent lengths such as LEDs were proposed in order to avoid the harmful coherent noise [3]. However, the limited coherence length of LED and its insufficient brightness hinders its application in an off-axis DHM. In this paper, we present an off-axis DHM configuration using femto-second pulse light with ultrashort coherent length.

© 2015 Japan Society of Applied Physics, Optical Society of America