Methodological notes

Lecture demonstrations on the interference of partially coherent light

, ,  a
a N.I. Lobachevskii Nizhnii Novgorod State University, prosp. Gagarina 23, Nizhnii Novgorod, Russian Federation

A system based on the Mach--Zender interferometer is described. It can be used for lecture demonstrations of interference between light waves with adjustable statistical parameters (degree and time of coherence). The light source is a continuously operating gas laser. Partially coherent light can be produced by modulating with one of the mirrors, using a piezoelectric barium titanate cylinder to establish the required amplitude and frequency. Another method used to vary the degree of coherence continuously from 1 to 0 relies on the introduction of a second, similar laser beam. More accurate quantitative data can be obtained by using a scanning mirror in conjunction with a photomultiplier. This transforms the intensity distribution into a ``transverse'' pattern on the screen of an oscilloscope. Polarization effects can also be demonstrated.

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Fulltext is also available at DOI: 10.1070/PU1979v022n09ABEH005610
PACS: 01.50.My, 07.60.Ly (all)
DOI: 10.1070/PU1979v022n09ABEH005610
Citation: Egorov G S, Mensov S N, Stepanov N S "Lecture demonstrations on the interference of partially coherent light" Sov. Phys. Usp. 22 757–759 (1979)
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Оригинал: Егоров Г С, Менсов С Н, Степанов Н С «Лекционные опыты по интерференции частично когерентного света» УФН 129 151–154 (1979); DOI: 10.3367/UFNr.0129.197909f.0151

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