Lijun Deng, Xingyan Huang, Lüming Zeng, Zhen Huang, Guodong Liu. Dual-Wavelength Image-Plane Digital Holographic Microscopy Based on Bi-Color LED Chips[J]. Acta Optica Sinica, 2018, 38(1): 0111004
- Acta Optica Sinica
- Vol. 38, Issue 1, 0111004 (2018)
Fig. 1. Packaging structure of bi-color LED chips. (a) Front view; (b) top view; (c) circuit; (d) physical map
Fig. 2. Power spectrum of bi-color LED chips
Fig. 3. Optical path of experimental setup
Fig. 4. Colorful digital holograms. (a) Without phase shift; (b) with phase shift
Fig. 5. Phase shifting digital holograms with two wavelengths. (a) Without phase shift at 670 nm; (b) with phase shift at 670 nm; (c) without phase shift at 521 nm; (d) with phase shift at 521 nm
Fig. 6. Reconstructed wrap phase maps using two-step phase shifting algorithm. (a) 670 nm; (b) 521 nm
Fig. 7. Experimental results. (a) Dual-wavelength phase map with phase distortion; (b) dual wavelength phase map without phase distortion; (c) 3D surface profile of the tested sample; (d) comparison of the measurement data
Fig. 8. Comparison of stability between the proposed system and the system with two individual light sources
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Table 1. Optical properties of the utilized bi-color LED chips
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