Compression of 250-fs, 1-x3BC;J pulses from a KLM Yb:YAG thin-disk oscillator down to 9.1xA0;fs is demonstrated. A kagomxE9;-PCF with a 36-x3BC;m core-diameter is used with a pressure gradient from 0 to 40xA0;bar of krypton. Compression to 22xA0;fs is achieved by 1200x2009;x2009;fs2 group-delay-dispersion provided by chirped mirrors. By coupling the output into a second kagomxE9;-PCF with a pressure gradient from 0 to 25xA0;bar of argon, octave spanning spectral broadening via the soliton-effect is observed at 18-W average output power. Self-compression to 9.1xA0;fs is measured, with compressibility to 5xA0;fs predicted. Also observed is strong emission in the visible via dispersive wave generation, amounting to 4% of the total output power.
- Pulse propagation and temporal solitons
- Ultrafast nonlinear optics
- Pulse compression
- Photonic crystal fibers