Abstract
We demonstrate high-energy resonant dispersive-wave emission in the deep ultraviolet (218 to 375nm) from optical solitons in short (15 to 34cm) hollow capillary fibers. This down-scaling in length compared to previous results in capillaries is achieved by using small core diameters (100 and 150μm) and pumping with 6.3fs pulses at 800nm. We generate pulses with energies of 4 to 6μJ across the deep ultraviolet in a 100μm capillary and up to 11μJ in a 150μm capillary. From comparisons to simulations we estimate the ultraviolet pulse to be 2 to 2.5fs in duration. We also numerically study the influence of pump duration on the bandwidth of the dispersive wave.
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