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Active reduction of frequency jitter in single-frequency ion lasers

One of the advantages of commercial ion lasers is their ability to produce high power cw output in a single longitudinal mode. When running in a single longitudinal mode, the short- term frequency 'jitter' (< 1 sec) is determined primarily by cavity vibration induced by water flow in the laser head. Using a piezo electric transducer to control the cavity length, we reduce the water-induced jitter by factors of up to 10.