In this work we present a design of an external optical cavity based on Fabry-Perot etalons applied to a 100 MHz Er-doped fiber optical frequency comb working at 1560 nm to increase its repetition frequency. A Fabry-Perot cavity is constructed based on a transportable cage system with two silver mirrors in plano-concave geometry including the mode-matching lenses, fiber coupled collimation package and detection unit. The system enables full 3D angle mirror tilting and x-y off axis movement as well as distance between the mirrors. We demonstrate the increase of repetition frequency by direct measurement of the beat frequency and spectrally by using the virtually imaged phased array images.

Department of Coherence Optics Institute of Scientific Instruments of the CAS v v i 61264 Brno Czech Republic

Department of Imaging Physics Faculty of Applied Sciences Delft University of Technology 2628 CJ Delft Netherlands

Department of New Technologies Institute of Scientific Instruments of the CAS v v i 61264 Brno Czech Republic

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