FIELD: quantum physics and quantum electronics.
SUBSTANCE: the invention presents a method to measure an extent of spatial coherence of laser light and is dealt with the field of quantum physics and quantum electronics. The method is founded on the tie of a visibility of an interference pattern with the instrumentally measured parameters of distribution of optical density of the registered interference pattern. In the capacity of registering medium they use the film, optically fine samples of solid solutions of the eosin coloring agent of eosin in gelatin, and the extent of the spatial coherence is determined by the following formula: 
where:- 
- minimum optical density,- 
maximum optical density, 
- optical density of an uniradiated part of a sample. The technical result of the invention is simplification and price reduction of the method to measure an extent of spatial coherence of the laser emission.
EFFECT: simplification and price reduction of the method to measure an extent of spatial coherence of the laser emission.
2 dwg
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