Generation of micro-J pulses in the deep UV at MHz repetition rates

Felix Köttig, Francesco Tani, Christian Biersach, John Travers, Philip St. J. Russell

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Abstract

Although ultraviolet (UV) light is important in many areas of science and technology, there are very few if any lasers capable of delivering wavelength-tunable ultrashort UV pulses at high repetition rates. Here we report the generation of deep UV laser pulses at megahertz repetition rates and microjoule energies by means of dispersive wave (DW) emission from self-compressed solitons in gas-filled single-ring hollow-core photonic crystal fiber (SR-PCF). Pulses from an ytterbium fiber laser (∼300  fs∼300  fs) are first compressed to <25  fs<25  fs in a SR-PCF-based nonlinear compression stage and subsequently used to pump a second SR-PCF stage for broadband DW generation in the deep UV. The UV wavelength is tunable by selecting the gas species and the pressure. Through rigorous optimization of the system, in particular employing a large-core fiber filled with light noble gases, we achieve 1 μJ pulse energies in the deep UV, which is more than 10 times higher, at average powers more than four orders of magnitude greater (reaching 1 W) than previously demonstrated, with only 20 μJ pulses from the pump laser.
Original languageEnglish
Pages (from-to)1272-1276
Number of pages5
JournalOptica
Volume4
Issue number10
DOIs
Publication statusPublished - 20 Oct 2017

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    Köttig, F., Tani, F., Biersach, C., Travers, J., & Russell, P. S. J. (2017). Generation of micro-J pulses in the deep UV at MHz repetition rates. Optica, 4(10), 1272-1276. https://doi.org/10.1364/OPTICA.4.001272