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Telecommunications and Radio Engineering
SJR: 0.202 SNIP: 0.2 CiteScore™: 0.23

ISSN 印刷: 0040-2508
ISSN オンライン: 1943-6009

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Telecommunications and Radio Engineering

DOI: 10.1615/TelecomRadEng.v65.i14.100
pages 1347-1355

Study of Spatial Frequency Spectra for Solution of Focusing Problems

M. I. Dzyubenko
A.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
S. N. Kolpakov
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085, Ukraine
A. A. Priyomko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura Str., Kharkiv 61085, Ukraine

要約

Method for focusing the objective lens based on analysis of a spatial spectrum of images, is described and its theoretical justification is presented. It is shown that there are one or several resonant spatial frequencies on a surface of any one object. For every resonance frequency a focal point has maximum intensity. It is associated with features of roughness formation. Processes of grinding and polishing result in that the rough surfaces are not absolutely random ones in terms of the probability theory. Consequently, optical fields generated by these objects are not also random. The conducted researches have allowed the combining process of fine focusing of a material-working laser with acquisition of a clearly defined image of a working surface.


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