Changchang Gong, Xin Liu, Bin Fan, Junming Shao. Design and Analysis of Diffractive Achromats Based on RGB Three-Band[J]. Acta Optica Sinica, 2021, 41(11): 1105001
- Acta Optica Sinica
- Vol. 41, Issue 11, 1105001 (2021)
Fig. 1. Traditional diffractive lens. (a) Continuous phase; (b) multi-step phase
Fig. 2. Dispersion of two kinds of lens. (a) Traditional refraction lens; (b) diffraction lens
Fig. 3. Equal width diffractive achromats (EWDA) and equal area diffractive achromats (EADA). (a) Equal width; (b) equal area
Fig. 4. Diagram of diffractive achromats. (a) Partition diagram; (b) relationship between focal length and wavelength
Fig. 5. Distribution of PSF. (a) Ordinary diffractive lens; (b) EWDA; (c) EADA
Fig. 6. Spot at the focal point of the three lenses at different wavelengths
Fig. 7. Diffraction efficiency of the three kinds of lenses working at RGB triband respectively and working at triband together
Fig. 8. Normalized point spread function at the focal plane of three lenses
Fig. 9. Energy contrast at the imaging plane. (a) PSF working in RGB band; (b) PSF working in G band
Fig. 10. Simulation and analysis of eight-level structure. (a) PSF of continuous structure and eight-level structure; (b) diffractive efficiency of eight-level DOE and PDA
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Table 1. Designed parameters of PDA
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