Sub-5-fs visible pulse generation by pulse-front-matched noncollinear optical parametric amplification

Sub-5-fs pulses are generated in the visible region. A pulse-front-matched noncollinear optical parametric amplifier is operated with the full bandwidth by precompression of the seeded continuum with a customized ultrabroadband chirped mirror (UBCM) pair. The signal is compressed down to a nearly transform-limited $4.7±0.1$ fs duration by a prism pair and another UBCM pair with a 5-$μ$J pulse energy.