Investigation on phase unwrapping in dual-wavelength digital holography - Details

Author：

Wang, Yujia (Wang, Yujia.) | Jiang, Zhuqing (Jiang, Zhuqing.) (Scholars：江竹青) | Gao, Zhirui (Gao, Zhirui.) | Cai, Wenyuan (Cai, Wenyuan.) | Wu, Jiangtao (Wu, Jiangtao.)

Indexed by：

EI PKU CSCD

Abstract：

Two　individual　digital　holograms　are　recorded　by　using　two　different　wavelengths,　respectively,　and　two　phase　images　for　the　wavelengths　are　obtained　after　numerical　reconstruction.　Subtraction　of　the　two　phase　images　corresponding　to　two　wavelengths　can　yield　a　new　phase　image　for　the　beat　wavelength.　The　final　phase　image　is　free　of　2π　discontinuities　after　dual-wavelength　phase　unwrapping.　This　method　is　explored　by　numerical　simulation,　and　then　a　dual-wavelength　digital　holographic　experimental　setup　is　constructed.　In　the　experiment,　two　lasers　of　different　wavelengths　of　660　nm　and　671　nm　are　used　to　make　phase　contrast　imaging　to　a　standard　quartz　flake　and　a　plano-concave　lens.　Continuous　phase　images　are　obtained　by　dual-wavelength　phase　unwrapping　method.　The　experimental　results　are　in　good　agreement　with　the　numerical　simulation.　The　effectiveness　of　dual-wavelength　phase　unwrapping　is　demonstrated.

Keyword：

Numerical methods Numerical models Holography Holograms

Author Community：

[ 1 ] [Wang, Yujia]College of Applied Sciences, Beijing University of Technology, Beijing 100124, China
[ 2 ] [Wang, Yujia]Institute of Information Photonics Technology, Beijing University of Technology, Beijing 100124, China
[ 3 ] [Jiang, Zhuqing]College of Applied Sciences, Beijing University of Technology, Beijing 100124, China
[ 4 ] [Jiang, Zhuqing]Institute of Information Photonics Technology, Beijing University of Technology, Beijing 100124, China
[ 5 ] [Gao, Zhirui]College of Applied Sciences, Beijing University of Technology, Beijing 100124, China
[ 6 ] [Gao, Zhirui]Institute of Information Photonics Technology, Beijing University of Technology, Beijing 100124, China
[ 7 ] [Cai, Wenyuan]College of Applied Sciences, Beijing University of Technology, Beijing 100124, China
[ 8 ] [Cai, Wenyuan]Institute of Information Photonics Technology, Beijing University of Technology, Beijing 100124, China
[ 9 ] [Wu, Jiangtao]College of Applied Sciences, Beijing University of Technology, Beijing 100124, China
[ 10 ] [Wu, Jiangtao]Institute of Information Photonics Technology, Beijing University of Technology, Beijing 100124, China