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We have investigated a zero-area Sagnac interferometer as a broad band gravitational-wave detector. Frequency response measurements of a laboratory-scale interferometer are in excellent agreement with theory. The measured contrast ratio, 0.996, is insensitive to induced birefringence, laser-frequency variation, arm imbalance, and dc mirror displacement. A near shot-noise-limited phase sensitivity of 3×10^-9rad/√Hz was measured at the interferometer's maximum sensitivity frequency, 90.9 MHz.
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Sun et al. (1996) studied this question.
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