Compact frequency standard at 192.6 THz (1556 nm) based on the 5S-5D two-photon transition in rubidium at 778 nm

摘要

We present our recent results toward the realization of an absolute frequency standard at 1556 nm based on the two-photon transition in rubidium at 778 nm. A compact transportable absolute frequency standard is described. Emphasis is put on the design of a periodically poled lithium niobate waveguide for efficient second-harmonic generation.