Abstract
We demonstrate the generation of highly efficient Cherenkov radiation (CR) in the fundamental mode of a GeO2-doped two zero dispersion wavelengths photonic crystal fiber (PCF). Using a high power femtosecond Yb-doped PCF laser emitting 100 fs pulses as the pump source, CR with an efficiency of >40 % and a bandwidth of 38 nm is obtained in the visible-wavelength range when the average power of pump light is 1.27 W. It is that injecting the pump light in deep anomalous dispersion regime contributes to such an efficient spectrally isolated CR. The mechanism during the forming of CR is discussed and the experimental results are in good agreement with the calculation.
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Acknowledgments
We are grateful to Minglie Hu, professor of Ultrafast Laser Lab of Tianjin University, Lili Huang, Xiaohui Fang and Dapeng Zhang for kindly providing the femtosecond laser and their help. This work was supported in part by National Natural Science Foundation of China (Grant No. 81100701).
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Zhang, X.B., Zhu, X., Chen, L. et al. Enhanced violet Cherenkov radiation generation in GeO2-doped photonic crystal fiber. Appl. Phys. B 111, 273–277 (2013). https://doi.org/10.1007/s00340-012-5329-6
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DOI: https://doi.org/10.1007/s00340-012-5329-6