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  • Title: Third and fifth harmonic generation by tightly focused femtosecond pulses at 2.2 μm wavelength in air.
    Author: Ariunbold GO, Polynkin P, Moloney JV.
    Journal: Opt Express; 2012 Jan 16; 20(2):1662-7. PubMed ID: 22274508.
    Abstract:
    We report experiments on the generation of third and fifth harmonics of millijoule-level, tightly focused, femtosecond laser pulses at 2.2 μm wavelength in air. The measured ratio of yields of the third and fifth harmonics in our setup is found equal to 2 · 10(-4). This result contradicts the recent suggestion that the Kerr effect in air saturates and changes sign in ultra-intense optical fields.
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