Stabilization of the Beatnote of a Dual-Frequency Laser at 1.5 (mu)m Using Fiber-Optic Delay Lines

摘要

We report on the stabilization of the beatnote of a 1.5 (mu)m dual-frequency laser using optical frequency-locked loops (OFLLs). The principle of these OFLLs is based on an electro-optical frequency discriminator which contains one or two fiber-optic delay lines. The lowest phase noise, -110 dBc/Hz at 10 kHz for frequencies ranging from 2 to 6 GHz, has been obtained by combining two delays of 5 (mu)s and 0.5 (mu)s.