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Cryogenic Optical Resonators: A New Tool For Laser Frequency Stabilization Below The 10-14 Level

A worldwide effort is underway to achieve optical oscillators with instabilities < 1 Hz. These activities are mostly geared toward frequency standards based on lasers stabilized to transitions in cold atoms or trapped ions. There is a need to develop complementary laser frequency stabilization schemes, for highresolution spectroscopy experiments, as flywheel oscillators for atom/ion frequency standards, and for dock-dock comparison experiments aimed at fundamental tests.