Abstract
Two ultrastable laser systems for the clock transition spectroscopy in the strontium frequency standard are developed. The high stability of laser radiation frequency is provided by the active loop for frequency referencing to the Fabry–Perot reference cavity. The used cavities are made of glass with ultra-low thermal expansion coefficient and are 48 cm long which provides an extremely low thermal noise limit of 7 × 10–17. The relative frequency drift velocity of laser systems is 216 mHz/s which allows the implementation of high-accuracy spectroscopy of the clock transition in strontium.
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