Generation of high energy 4.8 fs pulses from helium-argon mixture filled hollow waveguide

Self phase modulation in hollow waveguide filled with noble gases have been successfully used to produce ultra-broad bandwidths [1]. The intense spectral phase distortions produced by self phase modulation have previously been compensated by prism pairs and adaptive pulse shaping [2]. Here we demonstrate the generation of 4.8 fs, 200 µJ intense laser pulses by multiphoton intrapulse interference phase scan (MIIPS) [3, 4].