Towards Sub-10-fs Visible μJ Pulses at 1 MHz Repetition Rate From an Optical Parametric Amplifier

Energetic ultrashort visible pulses especially at high repetition rates are beneficial for wide fields of applications, e.g., ultrafast spectroscopy and nonlinear imaging [1] , [2] . In wavelength regions where no suitable laser gain material is available to provide those pulses, a well-established technique for the generation of the is optical parametric amplification (OPA) [3] .