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UDC 621.387.3

RESEARCH OF TEMPORAL COHERENCE LENGTH MEASUREMENT METHOD


V. S. Zorkin, post-graduate student, assistant RSREU, Ryazan; This email address is being protected from spambots. You need JavaScript enabled to view it.
A. A. Kondrakhin, PhD (technical sciences), Director of JSC "PLASMA", Ryazan; This email address is being protected from spambots. You need JavaScript enabled to view it.
E. G. Chulyaeva, PhD (technical sciences), full professor, RSREU, Ryazan; This email address is being protected from spambots. You need JavaScript enabled to view it.
M. Yu. Kernosov; senior researcher of JSC "Mostcom", Ryazan; This email address is being protected from spambots. You need JavaScript enabled to view it.
E. Yu. Gomozkova, master of Science, engineer RSREU, Ryazan; This email address is being protected from spambots. You need JavaScript enabled to view it.
G. V. Melnichuk, PhD (economic sciences), Head of the Department, RSREU, Ryazan, vladimir.This email address is being protected from spambots. You need JavaScript enabled to view it.

The paper objective is the research of the method measuring the length of temporal coherence, which is described in [1, 2] and estimation of method error. The method differs from the method recommended by industry standard with modulation of intensity reference signal. Furthermore, a new method does not include micrometric slit and scanning device. The research of described method is actual, because the method recommended by industry standard is not perfect. The theory underlying the method is studied. The effect of modulation to Michelson interferometer support arm length on output signal is calculated. The measurement error is calculated. Test data, which confirm theoretical calculations, are shown. The text shows that the error of described method is less than the error of the method recommended by industry standard.

Key words: length of temporal coherence, contrast, Michelson interferometer, path difference, support arm, modulation, piezoceramic substrate, intensity, He – Ne lasers.

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