Development of a Fabry-Pérot optical interferometer with low thermal and accelerometric sensitivities

This thesis explores the development of a transportable, ultra-narrow linewidth laser integrating a high-finesse Fabry-Perot cavity made from ultra-low expansion glass with optically contacted Fused Silica mirrors, aiming to minimize thermal and mechanical perturbations and enhance frequency stability. A novel digital frequency stabilization method using an FPGA-based platform is introduced, targeting a fractional frequency stability of 1×10^-15 at 1 s integration. This approach contrasts traditional analog systems by offering increased stability and reduced complexity. The study also examines several limitations of ultra-stable lasers like phase noise, thermal noise, etc. and several approaches to mitigate these types of noise. Additionally, an optical frequency dissemination system using FPGA-based phase-locked loops and optical fiber links is detailed, ensuring stable signal transmission over laboratory distances.

optical frequency standard, time and frequency metrology, ultra-stable oscillator, optical phase noise measurement, laser frequency stabilization

Full document (EN) : TEL-04823081