Direct measuring of single-cycle mid-IR light bullets path length in LiF by the laser coloration method Sergey Chekalin, Victor Kompanets, Andrey Kuznetsov, Alexander Dormidonov and Valerii Kandidov EPJ Web Conf., 161 (2017) 02011 Published online: 31 October 2017 DOI: 10.1051/epjconf/201716102011