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We demonstrate Ti:sapphire laser pulses of unprecedented spectral width, covering an optical octave without external continuum generation. The pulse spectrum spans more than 170 THz and supports bandwidth-limited two- cycle pulses. Assuming a sech2 pulse, the autocorrelation corresponds to a 4.8-fs pulse duration. The average power is 300 mW at a repetition rate of 100 MHz. The key features of the cavity are: dispersion compensation with broadband double-chirped mirrors combined with a prism pair, a broadband semiconductor saturable absorber mirror (SESAM) to assist Kerr-lens modelocking, and an out- put coupling mirror specifically designed to broaden the pulse spectrum.
© 1999 Optical Society of America
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