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When constructed in monolithic fashion, a classic Mach-Zehnder interferometer with arms of different lengths becomes a highly stable frequency reference. The authors' scheme, easily adaptable for various experiments, is promising for space-based laser interferometry to track the motion of test masses---prominently the Laser Interferometer Space Antenna (LISA) for detecting gravitational waves. The prototype already achieves LISA requirements at and below 1 Hz.
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