Chon-Wen Chang, Der‐Chin Su
Abstract
The tested light is projected onto an arrangement composed of two special spiral gratings, in which the second spiral grating is positioned at the Talbot image of the first one. From the shapes of the resultant moiré fringes, the quality of collimation of the tested light can be easily checked.
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The tested light is projected onto an arrangement composed of two special spiral gratings, in which the second spiral grating is positioned at the Talbot image of the first one. From the shapes of the resultant moiré fringes, the quality of collimation of the tested light can be easily checked.
Key concepts: Optics, Talbot effect, Collimated light, Grating, Moiré pattern, Spiral (railway), Interferometry, Diffraction grating