期刊
OPTICS EXPRESS
卷 24, 期 9, 页码 9412-9428出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.24.009412
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- Munich-Centre for Advanced Photonics (MAP)
Spectral broadening in bulk material is a simple, robust and low-cost method to extend the bandwidth of a laser source. Consequently, it enables ultrashort pulse compression. Experiments with a 38MHz repetition rate, 50W average power Kerr-lens mode-locked thin-disk oscillator were performed. The initially 1.2 mu J, 250 fs pulses are compressed to 43 fs by means of self-phase modulation in a single 15mm thick quartz crystal and subsequent chirped-mirror compression. The losses due to spatial nonlinear effects are only about 40 %. A second broadening stage reduced the Fourier transform limit to 15 fs. It is shown that the intensity noise of the oscillator is preserved independent of the broadening factor. Simulations manifest the peak power scalability of the concept and show that it is applicable to a wide range of input pulse durations and energies. (C) 2016 Optical Society of America
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