Ultrastable Laser System Using Room-Temperature Optical Cavity with 4.8×10−17 Thermal Noise Limit
2019
A new clock laser system using an optical cavity with $4.8 \times 10^-17$ thermal noise limit has been developed for rapid evaluation of ytterbium lattice clocks. This was realized by using a 30-cm-long ULE cavity, fused-silica mirror substrates, and crystalline mirror coatings. The frequency stability of the beating signal between the new clock laser and the old clock laser was limited by the latter. The linewidth and the frequency stability of the new clock laser will be measured by comparing the frequency between two similar systems.
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