Li Yushan, Jin Feng. Effect of coupling gap for prism-film couplers on the errors of film parameters[J]. Chinese Journal of Lasers, 1980, 7(1): 42
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The coupling gap of prism-film couplers has been measured by iso-thickness interference. The mode propagation constants of thin-film waveguide,refractive index and thickness of the film have been measured at different coupling gaps.Effect of the coupling gap on the measurement errors of film parameters has been analyzed by Tien and Ulrich’s theory of prism-film coupler.