Risley prism scan patterns

Gerald F. Marshall

doi:10.1117/12.351658

2 July 1999 Risley prism scan patterns

Gerald F. Marshall

Proceedings Volume 3787, Optical Scanning: Design and Application; (1999) https://doi.org/10.1117/12.351658
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

The Risley optical scanning system consists of two sequential wedge prisms, which have wedge angles A₁ and A₂, that are capable of rotating about the optical scan axis at angular speeds (omega) ₁ and (omega) ₂. When a focused laser beam is directed along the optical scan axis and through the prisms, the emergent beam is deviated in a direction according to the relative orientation of the prisms with respect to each other. When the individual prisms are rotated clockwise or counterclockwise, the combined deviation angle and the orientation phase change with time, such that the image spot traces out a vector pattern. This paper presents an interesting set of generated scan patterns that include regular polygons by selecting particular values for the ratios of A₂/A₁ and (omega) ₂/(omega) ₁.

Citation Download Citation

Gerald F. Marshall "Risley prism scan patterns", Proc. SPIE 3787, Optical Scanning: Design and Application, (2 July 1999); https://doi.org/10.1117/12.351658

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