Abstract
ABSTRACT The plane parallel plate [PPP] and wedge plate [WP] interferometers are the simplest configurations for collimation testing. These elements are usually used in reflection due to high fringe visibility. The reflection coated wedge plate acting as a shearing interferometer both in reflection and transmission is reported recently [1,2]. Thismultiple beam wedge plate lateral shear interferometer (MBWPLSI) used for collimation testing gives superiorperformance compared to an uncoated wedge plate interferometer [3]. In this paper, some aspects of the multiplebeam interferometer and its use in the double pass configuration are presented. Double pass results in a system of fringes in which adjacent fringes rotate and split in opposite directions for a non-collimated beam resulting in furtherimprovement in the setting sensitivity.1. INTRODUCTIONThe PPP and the WP interferometers are the simplest configurations for collimation testing [4]. In the PPP interferometer fringe free field is obtained at collimation. On the contrary, in the WP interferometer, straight
Published Version
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