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Dual-wavelength slightly off-axis digital holographic microscopy.

Authors
  • Min, Junwei
  • Yao, Baoli
  • Gao, Peng
  • Guo, Rongli
  • Ma, Baiheng
  • Zheng, Juanjuan
  • Lei, Ming
  • Yan, Shaohui
  • Dan, Dan
  • Duan, Tao
  • Yang, Yanlong
  • Ye, Tong
Type
Published Article
Journal
Applied Optics
Publisher
The Optical Society
Publication Date
Jan 10, 2012
Volume
51
Issue
2
Pages
191–196
Identifiers
PMID: 22270516
Source
Medline
License
Unknown

Abstract

We propose dual-wavelength digital holographic microscopy with a slightly off-axis configuration. The axial measurement range without phase ambiguity is extended to the micrometer range by synthesizing a beat wavelength between the two wavelengths with separation of 157 nm. Real-time measurement of the specimen is made possible by virtue of the high wavelength selectivity of the Bayer mosaic filtered color CCD camera. The principle of the method is exposed, and the practicability of the proposed configuration is demonstrated by the experimental results on a vortex phase plate and a rectangular phase step.

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