Rb-based optical frequency reference at 1572 nm

Abstract

In the frame of an optical reference laser system, a frequency-stabilized optical frequency comb was generated from the radiation of a 1560-nm DFB laser, which was frequency-doubled and stabilized to a rubidium transition in a sub-Doppler absorption scheme using a 2-cm long vapor glass cell. A DFB laser emitting at 1572 nm was then offset-locked to an appropriate line of the comb. At 1572 nm, a relative frequency stability of 110-11 at 1 s has been obtained, reaching <; 410-12 from 3,000 s up to 3 days.