D
- Dark state
- Densitometry
- Depolarizer (optics)
- Diaphragm (optics)
- Dichroism
- Dichroic filter
- Dichroic prism
- Dichromatic reflectance model
- Differential group delay
- Diffraction
- Diffraction grating
- Diffraction spike
- Diffractive optics
- Digital handheld refractometer
- Dispersion (optics)
- Double-Gauss lens
- Double refraction
- Double-slit experiment
- Dual polarisation interferometry
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