Figure 4. A tungsten lamp requires a pinhole and filter to produce coherent light. The light from a laser is naturally coherent. (a) Tungsten lamp. Th
{"Image DocumentName": "Figure 4.A tungsten lamp requires a pinhole and filter to produce coherent light.", "Image ImageDescription": "The light from a laser is naturally coherent. (a) Tungsten lamp. The Tungsten lamp is an extended source that emits many wavelength. The emission lacks both temporal and spatial coherence. The wave front are irregular and change shape in a haphazard manner. (b) Tungsten lamp with pinhole. An ideal pinhole limits the extent of the tungsten source and improve the spatial coherence of the light. However the light still lacks temporal coherence since all wavelengths are present. Power in the beam has been decreased..", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}