Journal
ACTA OPTICA SINICA
Volume 38, Issue 1, Pages -Publisher
CHINESE LASER PRESS
DOI: 10.3788/AOS201838.0111004
Keywords
imaging systems; dual-wavelength image-plane digital holographic microscopy; bi-color LED chips; phase distribution; surface profile
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Dual-wavelength image-plane digital holographic microscopy based on bi-color LED chips is proposed. Firstly, a red LED chip with central wavelength of 670 nm and a green LED chip with central wavelength of 521 nm are packaged as a hemispherical LED chip. Composite holograms at different wavelengths and phase shift are recorded with a color CCD camera. The phase distribution and surface profile of the sample are reconstructed based on the color separation technology, phase shifting technology and dual-wavelength phase extracting technology. The feasibility of the proposed method is demonstrated by the experimental results.
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