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30 October 2009 Alterable focal shift of concentric piecewise cylindrical vector beam
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Proceedings Volume 7497, MIPPR 2009: Medical Imaging, Parallel Processing of Images, and Optimization Techniques; 74970X (2009) https://doi.org/10.1117/12.832338
Event: Sixth International Symposium on Multispectral Image Processing and Pattern Recognition, 2009, Yichang, China
Abstract
Focal shift plays an important in many optical fusing systems. In this article, focal shift of concentric piecewise cylindrical vector beam is investigated by means of vector diffraction theory in detail. The section of the beam consists of three concentric zones. The center circle zone and outer annular zone are radial polarized, and the inner annular zone is generalized polarized. In addition the wavefront phase distribution of the vector beam is linear function to radial coordinate. It is found that the parameter in phase distribution induces focal shift and can alter focal shift considerably. However, radii of the inner annular zone and polarization angle do affect focal shift very slightly. So the phase parameter can be used to alter big focal shift while the radii and polarization angle may be employed to adjust intensity distribution. In focusing system, the focal shift and intensity distribution may be controlled separately, which improves the application freedom of this kind of technique. Focal shift direction can also be altered by change the phase parameter.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Qiufang Zhan, Jinsong Li, and Xiumin Gao "Alterable focal shift of concentric piecewise cylindrical vector beam", Proc. SPIE 7497, MIPPR 2009: Medical Imaging, Parallel Processing of Images, and Optimization Techniques, 74970X (30 October 2009); https://doi.org/10.1117/12.832338
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