[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Optical Repetition Rate Stabilization Techniques of Ultrafast Yb Doped All Fiber Oscillator

摘要： High intensity lasers usually based on OPCPA technology [1] require stable and precisely controlled repetition rate of the oscillator. Common method of repetition rate control is based on movable mirrors mounted on piezoelectric stages in free space [2]. This method has some disadvantages such as sensitivity to changes of ambient conditions and requirement for high voltage driving of piezo actuators. Different approach of fiber laser repetition rate control, which helps to overcome these shortcomings, is based on refractive index modification [3] instead of geometrical oscillator length change. In this work we demonstrate all-fiber concept of precise repetition rate control of an ultrafast ytterbium oscillator passively mode-locked using semiconductor saturable absorber mirror (SESAM). Refractive index change in Er-doped fiber core induced by pump laser power change allowed to lock repetition rate of oscillator to external clock frequency using phase-locked loop (PLL) electronics.