7 September 2017 Extension of supercontinuum spectrum generated in photonic crystal fiber by using chirped femtosecond pulses
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Abstract
We present results of experimental and numerical investigation of supercontinuum generation in polarization maintaining photonic crystal fiber (PCF) using chirped femtosecond pulses. The initial unchirped pump pulse source was a mode-locked Yb:KGW laser generating 52 nJ energy 110 fs duration pulses at 1030 nm with 76 MHz repetition rate. The nonlinear medium was a 32 cm long polarization maintaining PCF manufactured by NKT Photonics A/S. We demonstrated the influence of pump pulse chirp on spectral characteristics of supercontinuum. We showed that by chirping pump pulses positively or negatively one can obtain broader supercontinuum spectrum than in case of unchirped pump pulses at the same peak power. Moreover, the extension can be controlled by changing the amount of pump pulse chirp. In our case the supercontinuum spectrum width was extended by up to 115 nm (at maximum chirp value of +10500 fs2 that we could achieve in our setup) compared to the case of unchirped pump at the same peak power.
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Julius Vengelis, Julius Vengelis, Vygandas Jarutis, Vygandas Jarutis, Valdas Sirutkaitis, Valdas Sirutkaitis, } "Extension of supercontinuum spectrum generated in photonic crystal fiber by using chirped femtosecond pulses", Proc. SPIE 10380, Ultrafast Nonlinear Imaging and Spectroscopy V, 1038016 (7 September 2017); doi: 10.1117/12.2272478; https://doi.org/10.1117/12.2272478
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