To provide a luminous flux controller with which shear is easily, accurately and continuously varied without requiring any mechanical mechanism, and to provide an interference device and a differential interference microscope.
A splitting part 201 has a polarization beam splitting element and a splitting side birefringent element wherein each of them has an incident plane and a light emitting plane in parallel to each other. A luminous flux I of linearly polarized light is split into luminous fluxes O, E with the polarization beam splitting element and the fluxes become parallel to each other after passing through the splitting side birefringent element. The luminous fluxes O, E pass through a superposition part 202 having a superposition element and a superposition side birefringent element via an observation object 5. Refractive indexes of the splitting side and superposition side birefringent elements with respect to one of the luminous fluxes are electrically varied with splitting side and superposition side refractive index varying parts 214, 215. The controlling part 17 controls the splitting side and superposition side refractive index varying parts 214, 215 such that a predetermined amount Δ of sharing is achieved, and the luminous fluxes O, E are superposed at the superposition part 202.
Sadao Muramatsu
Atsushi Tsuboi
Satoshi Kono
Tetsuya Kazama
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