We present a comparative study of supercontinuum generation in sapphire, yttrium aluminium garnet (YAG) and potassium gadolinium tungstate (KGW) crystals with 210 fs, 1030 nm pulses from an amplified Yb:KGW laser. We demonstrate that KGW crystal has the lowest supercontinuum generation threshold, negligible bulk heating due to low nonlinear losses and exhibits long-term damage-free operation at 2 MHz repetition rate without any need for translation of the crystal. Our results prove that KGW crystal is an excellent nonlinear material for high average power infrared supercontinuum generation and for seeding high repetition rate fundamental harmonics-pumped ultrafast optical parametric amplifiers.
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