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- Title
Theoretical and experimental studies of the spectral changes of a focused polychromatic partially coherent flat-topped beam.
- Authors
Zhu, Shijun; Li, Zhenhua
- Abstract
An analytical propagation formula for a focused polychromatic partially coherent flat-topped beam with circular symmetry is derived in a tensor form that is based on the alternative flat-top beams model proposed by Li (Opt Lett 27:1007, ). The dependence of the relative spectral shift on the flat-top order N is investigated numerically in detail. It is shown that the on-axis maximum relative spectral shift occurs at the back focal plane, while the no spectral shift observes at the image plane. Furthermore, we report the experimental generation of a polychromatic partially coherent FT beam. The on-axis and off-axis spectral measurement verifies the theoretical study.
- Subjects
POLYCHROMATORS; IMAGE processing; SPECTRUM analysis; COHERENCE (Physics); SYMMETRY (Physics)
- Publication
Applied Physics B: Lasers & Optics, 2015, Vol 118, Issue 3, p481
- ISSN
0946-2171
- Publication type
Article
- DOI
10.1007/s00340-015-6016-1