A Single mode from Optical Frequency Comb with relative stability of 10−17 using Stimulated Brillouin Scattering

The spectrum of Optical Frequency Combs (OFC) consists of a series of closely spaced optical frequencies that spread over tens to hundreds of nanometers. Stimulated Brillouin Scattering (SBS) can be used to filter a single-mode from the OFC spectrum with superior amplification; however, the stability of the filtered mode can be degraded to the level of 10 ^-11 in the course of the SBS filtration process. This prevents the employment of this technique in high precision experiments. In this paper, a phase locking scheme is introduced to enhance the relative stability and accuracy of the filtered mode with respect to its original one. After application of this scheme, the relative stability between both modes reaches 10 ^-17 in 100 seconds; while, the relative accuracy is measured to be 3.6×10 ^-19.