Development of new beamsplitter system for real-time high-speed holographic interferometry

A new beam-splitter suitable for real-time high-speed holographic interferometry is manufactured and its high performance is confirmed. This beamsplitter is constructed with an electro-optical phase-modulator,a polarized prism and a half-wave phase-plate. This system has merits that an arbitrary intensity ratio of a reference beam and an object beam is obtained with no mechanical movement and that the intensity ratio is remotely controlled apart from the beam-splitter.