Abstract
An actively stabilized Michelson interferometer with a long optical-path-length difference is developed to generate a phase-locked pulse pair on the order of nanoseconds. A rigid frame and a piezoelectric feedback loop enable us to stabilize an interferometer to the optical-path-length difference of up to 5.8 m within λ/20 for 1 h. It is demonstrated that this interferometer is useful for generating a phase-tunable pulse pair up to an interval of 19 ns, which opens new possibilities for measuring the long-time coherence in the nanosecond region in the field of coherent control spectroscopy.
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