Abstract
The generation of intense mid-infrared (mid-IR) optical pulses with customizable shape and spectra spanning a multiple-octave range of vibrational frequencies is an elusive technological capability. While some recent approaches to mid-IR supercontinuum generation—such as filamentation, multicolour four-wave-mixing and optical rectification1,2,3,4,5,6,7,8—have successfully generated broad spectra, no process has been identified for achieving complex pulse shaping at the generation step. The adiabatic frequency converter9,10 allows for a one-to-one transfer of spectral phase through nonlinear frequency conversion over a larger-than-octave-spanning range and with an overall linear phase transfer function. Here, we show that we can convert shaped near-infrared (near-IR) pulses to shaped, energetic, multi-octave-spanning mid-IR pulses lasting only 1.2 optical cycles, and extendable to the sub-cycle regime. We expect this capability to enable a new class of precisely controlled nonlinear interactions in the mid-IR spectral range, from nonlinear vibrational spectroscopy to strong light–matter interactions and single-shot remote sensing.
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Acknowledgements
This material is based on work supported by the Air Force Office of Scientific Research under award numbers FA9550-12-1-0080, FA9550-12-1-0499 and FA9550-13-1-0159, by the Center for Free-Electron Laser Science, DESY and by the excellence cluster ‘The Hamburg Centre for Ultrafast Imaging: Structure, Dynamics and Control of Matter at the Atomic Scale’ of the Deutsche Forschungsgemeinschaft (by grant EXC 1074). P.K. acknowledges support by a National Defense Science and Engineering Graduate (NDSEG) Fellowship. H.S. acknowledges support by the European Research Council (ERC) Fund under the project MIRAGE 20-15. J.M. and P.K. thank D. Brida for helpful advice regarding the FROG pulse retrieval algorithm.
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J.M., H.S., F.X.K. and P.K. conceived and designed the experiment, H.S. designed the adiabatic grating, P.K. and J.M. constructed the modified OPCPA system and ADFG stage, P.K. and H.L. carried out the pulse compression, shaping and characterization with help from K.-H.H. F.X.K designed the octave-spanning Ti:sapphire laser and provided essential infrastructure for the experiment, and P.K., N.F. and J.M. carried out the pulse propagation simulations and analysis. All authors discussed the results and contributed to the manuscript.
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Krogen, P., Suchowski, H., Liang, H. et al. Generation and multi-octave shaping of mid-infrared intense single-cycle pulses. Nature Photon 11, 222–226 (2017). https://doi.org/10.1038/nphoton.2017.34
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DOI: https://doi.org/10.1038/nphoton.2017.34
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