A Femtosecond Ti:Sapphire Laser with GHz Repetition Rate

The invention of solid-state femtosecond lasers, the Ti:sapphire laser based on Kerr-lens modelocking,1 had probably the deepest impact on the development of ultra-fast spectroscopy and nonlinear optics within the last decade. Since the era of ultrafast physics based on femtosecond dye lasers in the 1980s, the solid-state systems have lead to an enormous expansion of the whole field.

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