Effective-focal-length calculations and measurements for a radial diffraction grating
- Lawrence Livermore National Laboratory, P.O. Box 808, L-481, Livermore, California 94550 (United States)
- FANUC Berkeley Laboratory, 29700 Kohoutek Way, Union City, California 94587 (United States)
As the technology for manufacturing radial diffraction gratings improves, there will be increasing interest in using high-groove-density radial gratings as scales for precision interferometer-type rotary encoders. If efficiency in optical designs is to be optimized, the focusing properties of these gratings must be understood. We use analytical geometry to investigate the focusing properties of a radial diffraction grating illuminated by laser light diverging from a pointlike source. We compare the results with experiments that we performed with a state-of-the-art custom radial grating, and we obtain excellent agreement with our calculations, which improve on earlier analytical work. {copyright} 1999 Optical Society of America
- OSTI ID:
- 688006
- Journal Information:
- Journal of the Optical Society of America, Part A: Optics and Image Science, Vol. 16, Issue 11; Other Information: PBD: Nov 1999
- Country of Publication:
- United States
- Language:
- English
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