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《Applied Laser》 1993-01
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An application of the wedge-plate shearing interometric techniques on focal length measurement

Zhao Mingshan;Li Guohua Laser Institute Qufu Normal University  
A new method of measuring the focal length based on the wedge-plate shesring interferometric tech- nique is presented. This method adopts the change of the fringe orientation to determine the focal length, and hence it has the advantages of simple apparatus, convenient adjustment and high accuracy.In addation, it can also be used in invisible regions.
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