Open AccessDigital holographic microscope employing dual-Lloyd’s mirror
Author(s) -
Fei Yuan,
Yuan Chen,
Nie Shou-Ping,
Zhuqing Zhu,
Qingyu Ma,
Ying Li,
Zhu Wen-Yan,
Shuai Feng
Publication year - 2014
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.63.104207
Subject(s) - holography , optics , wavelength , digital holography , digital holographic microscopy , reference beam , phase (matter) , microscope , dual (grammatical number) , amplitude , physics , art , literature , quantum mechanics
We propose a digital holographic microscopy (DHM) setup employing a configuration with two Lloyd's mirrors, which is based on self-referencing and dual-wavelength optical phase unwrapping. We use two Lloyd's mirrors to fold the beam which does not exhibit sample structure and acts as the reference beam, returning onto itself to form a dual-wavelength hologram. Two wrapped phase images for every wavelength are reconstructed by angular spectrum method. Then the wrapped phase image and the three-dimensional profile image are acquired by dual-wavelength optical unwrapping method. In the experiment, we use two lasers of different wavelengths of 532 and 632 nm to record a hologram. Numerical methods are subsequently applied to reconstruct the hologram to enable direct access to both phase and amplitude information. The quantitative experimental results with dual-wavelength DHM involve a deviation less than 5% from the calibration values. The validity of this method is demonstrated.