Abstract:We investigate hollow-core fibers for fiber delivery of high power ultrashort laser pulses. We use numerical techniques to design an anti-resonant hollow-core fiber having one layer of non-touching tubes to determine which structures offer the best optical properties for the delivery of high power picosecond pulses. A novel fiber with 7 tubes and a core of 30µm was fabricated and it is here described and characterized, showing remarkable low loss, low bend loss, and good mode quality. Its optical properties are compared to both a 10µm and a 18µm core diameter photonic band gap hollow-core fiber. The three fibers are characterized experimentally for the delivery of 22 picosecond pulses at 1032nm. We demonstrate flexible, diffraction limited beam delivery with output average powers in excess of 70W. "Efficient spectral broadening in the 100-W average power regime using gas-filled kagome HC-PCF and pulse compression," Opt. Lett. 39, 6843-6846 (2014). 8. D. C. Jones, C. R. Bennett, M. a. Smith, and a. M. Scott, "High-power beam transport through a hollow-core photonic bandgap fiber," Opt. Lett. 39, 3122-3125 (2014). 9. T. P. Hansen, J. Broeng, C. Jakobsen, G. Vienne, H. R. Simonsen, M. D. Nielsen, P. M. W. Skovgaard, J. R.Folkenberg, and A. Bjarklev, "Air-guiding photonic bandgap fibers: spectral properties, macrobending loss, and practical handling," J. Light.

Abstract:Gas-filled hollow-core photonic crystal fibers are used to stabilize a fiber laser to the 13 C 2 H 2 P(16) (ν 1 + ν 3 ) transition at 1542 nm using saturated absorption. Four hollow-core fibers with different crystal structure are compared in terms of long term lock-point repeatability and fractional frequency instability. The locked fiber laser shows a fractional frequency instability below 4 × 10 −12 for averaging time up to 10 4 s. The lock-point repeatability over more than 1 year is 1.3 × 10 −11 , corresponding to a standard deviation of 2.5 kHz. A complete experimental investigation of the light-matter interaction between the spatial modes excited in the fibers and the frequency of the locked laser is presented. A simple theoretical model that explains the interaction is also developed.

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