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Airfoil-ed
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I just wanted to know, what causes laser speckling? interference with air? uneven projection surface?
Laser speckling is a phenomenon that occurs when a laser beam strikes a rough surface, causing a pattern of bright and dark spots to form. These spots are caused by interference between the light waves reflected from different parts of the surface.
Laser speckling is primarily caused by the surface roughness of the material being illuminated by the laser beam. The roughness causes the light waves to scatter in different directions, resulting in the interference pattern.
Laser speckling can be reduced by using a smoother surface or by using a diffuser to scatter the laser beam before it reaches the surface. However, complete elimination is difficult to achieve as it is an inherent property of laser light.
Laser speckling can affect the accuracy and precision of laser measurements, as the intensity of the speckle pattern can vary depending on the angle and distance of the measurement. This can lead to errors in calculations and data interpretation.
Laser speckling can be used in various applications such as holography, interferometry, and in the measurement of surface roughness. It is also a useful tool in the study of materials and their properties, as it provides information about the surface structure.