Authors: T Liu YH Wang R Dumke A Stejskal YN Zhao J Zhang ZH Lu LJ Wang Th Becker H Walther
Publish Date: 2007/03/24
Volume: 87, Issue: 2, Pages: 227-232
Abstract
We report an ultranarrow linewidth light source applicable for a frequency standard in the ultraviolet The laser is a NdYAG laser that emits at 946 nm with 300mW output power It is locked to a highfinesse cavity The minimum Allan deviation is 13×1014 for an integration time of 1 s which corresponds to a laser linewidth of 28 Hz The cavity drift is measured by a frequency comb and a singleion spectrum for different time scales In order to investigate broadening mechanisms due to the fiber transport and doubling systems the laser light is frequency doubled with two independent systems and compared The measured minimum beatnote between the two laser fields is less than 1 Hz By carrying out a highresolution scan on a trapped single indium ion we observe a linewidth of 260 Hz on the ion clock transition Possible reasons for the broadening effects are discussed
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