STUDIES ON AN IMPROVED COMPACT PHYSICS PACKAGE FOR RUBIDIUM STANDARDS

摘要

We present a compact laser-pumped rubidium frequency standard with a short-term frequency stability of 6 × 10~(-13)τ~(-1/2) and having a fundamental shot-noise limit below 8 × 10~(-14) τ~(-1/2). Our clock employs the physics package with a 25 mm diameter buffer-gas cell inside a compact microwave cavity, a newly developed laser head with integrated acousto-optical modulator to minimize the Light Shift effect, and a low-noise microwave synthesizer. This work paves the way for realization of clock stabilities δ_y(τ) < 1 × 10~(-13) τ~(-1/2) with a compact standard.