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16 fs, 350 nJ pulses at 5 MHz repetition rate delivered by chirped pulse compression in fibers

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Abstract

We demonstrate a simple approach for broadening and compression of intense pulses at megahertz repetition rates by self-phase modulation in nonlinear photonic crystal fibers. In order to avoid damage by self-focusing, we positively chirp the input pulses, which allows coupling of significantly more energy into the fiber, while maintaining the same spectral bandwidth and compression as compared to the Fourier-limited case at lower energy. Using a commercial long-cavity Ti:sapphire oscillator with 55fs, 400nJ pulses at 5MHz, we generate 16fs, 350nJ pulses, which is a factor of 4 more energy than possible with unchirped input pulses. Self-phase-modulated spectra supporting 11fs duration are also shown with 350nJ pulse energy. Excellent stability is recorded over at least 1h.

© 2011 Optical Society of America

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