“Shine a laser beam onto a dark surface. A granular pattern can be seen inside the spot. When the pattern is observed by a camera or the eye, that is moving slowly, the pattern seems to drift relative to the surface. Explain the phenomenon and investigate how the drift depends on relevant parameters.”
Francon, M. Laser Speckle and Applications in Optics. London: Academic Press, 1979.
Wikipedia: Speckle pattern, https://en.wikipedia.org/wiki/Speckle_pattern
Wikipedia: Diffuse reflection, https://en.wikipedia.org/wiki/Diffuse_reflection
Topics in Applied Physics Volume 9
Duncan, D & Kirkpatrick, Sean. (2008). Algorithms for simulation of speckle (laser and otherwise).https://www.researchgate.net/publication/233783056_Algorithms_for_simulation_of_speckle_laser_and_otherwise
A Hinsdale, Taylor. (2014). Laser Speckle Imaging: A Quantitative Tool for Flow Analysis.https://www.researchgate.net/publication/304217861_Laser_Speckle_Imaging_A_Quantitative_Tool_for_Flow_Analysis
A E Ennos, Laser speckle experiments for students, Physics Education, Volume 31, Number 3. https://iopscience.iop.org/article/10.1088/0031-9120/31/3/012/pdf