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Efficient supercontinuum (SC) generation featuring high spectral intensityacross a large bandwidth requires high peak powers of several megawatt frompulsed lasers. Under these conditions and at multi-kilohertz (kHz) repetitionrates, the SC generated in most materials is unstable due to thermal effects.In this work, we leverage the superior dispersion properties of water tomaximize the spectral width of the SC, while avoiding stability issues due tothermal loading by means of a constant laminar flow of the liquid. This flow iscontrolled by a differential pressure scheme that allows to precisely adjustthe fluid velocity to an optimum value for maximum stability of the SC. Thisapproach is successfully implemented for repetition rates of 50 kHz and 100 kHzand two different pump wavelengths in the visible (VIS) and near infrared (NIR)spectral region with stability of the SC signal only limited by the drivingpulses. The resulting water SC spans more than one octave covering the VIS toNIR range. Compared to established materials, such as yttrium aluminum garnet(YAG) and sapphire, the spectral bandwidth is increased by 60 % and 40 %respectively. Our scheme has the potential to be implemented with other liquidssuch as bromine or carbon disulfide (CS2), which promise even wider broadeningand operation up to the mid-infrared.

High stability white light generation in water at multi-kilohertz repetition rate