Radiofrequency synthesiser with an intrinsic instability of 5 × 10-15 at the averaging time of 1 s based on a femtosecond erbium-doped fibre laser. (December 2020)

• Record Type: Journal Article
• Authors: Kireev, A N; Shelkovnikov, A S; Tausenev, A V; Tyurikov, D A; Gubin, M A
• Is Part Of: Quantum electronics. Volume 50:Number 12(2020)
• Page Start: 1155
• Page End: 1159
• Publication Date: 2020-12
• Subjects: femtosecond synthesiser -- fibre laser -- He – Ne/CH4 frequency standard -- ultra-low phase noise microwave generator.; Quantum electronics -- Periodicals; 537.5
• DOI: 10.1070/QEL17437
• Languages: English
• ISSNs: 1063-7818

Abstract

Abstract: A radio-optical synthesiser intended for operation in a radio-frequency master oscillator with an optical He – Ne/CH4 frequency standard (λ = 3.39 μm) is developed on the basis of a femtosecond erbium-doped fibre laser. The synthesiser generates equidistant harmonics in the frequency range of 1 – 10 GHz with stability determined by the optical frequency standard. A stable supercontinuum spectrum is formed in the range around 1.06 μm, which provides stable 24-hour operation of the synthesiser and is important for practical applications in off-laboratory conditions. A direct comparison of the output frequencies of two synthesisers shows that the up-grade of the fibre laser and detection system of femtosecond pulses results in the synthesiser intrinsic instability of 5 × 10 -15 at the averaging time of 1 s. Such a value is by an order of magnitude less than that obtained in our earlier works.