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Hybrid highly nonlinear fiber for spectral supercontinuum generation in mobile femtosecond clockwork

We have proposed and tested a novel design of a short-length dispersion-managed hybrid highly nonlinear fiber (HNLF), which is intended for low-noise spectral supercontinuum generation with controlled intensity distribution over the range 1–2 µm. It is shown experimentally that such a HNLF facilitates development of a mobile femtosecond optical clockwork, which is based on a fiber-optic femtosecond laser system and an original fiber-coupled Nd : YAG/I2 optical frequency standard with a long-term instability lowered to 3 × 10−15.