@article{6542,
  abstract     = {{Transient changes of the optical response of WS2 monolayers are studied by femtosecond broadband pump–probe spectroscopy. Time-dependent absorption spectra are analyzed by tracking the line width broadening, bleaching, and energy shift of the main exciton resonance as a function of time delay after the excitation. Two main sources for the pump-induced changes of the optical response are identified. Specifically, we find an interplay between modifications induced by many-body interactions from photoexcited carriers and by the subsequent transfer of the excitation to the phonon system followed by cooling of the material through the heat transfer to the substrate.}},
  author       = {{Ruppert, Claudia and Chernikov, Alexey and Hill, Heather M. and Rigosi, Albert F. and Heinz, Tony F.}},
  issn         = {{1530-6984}},
  journal      = {{Nano Letters}},
  keywords     = {{Atomically thin 2D materials, carrier and phonon dynamics, ultrafast spectroscopy}},
  number       = {{2}},
  pages        = {{644--651}},
  publisher    = {{American Chemical Society (ACS)}},
  title        = {{{The Role of Electronic and Phononic Excitation in the Optical Response of Monolayer WS2 after Ultrafast Excitation}}},
  doi          = {{10.1021/acs.nanolett.6b03513}},
  volume       = {{17}},
  year         = {{2017}},
}

@article{6543,
  abstract     = {{Up to 400 mW of near-IR (1370-1500 nm) femtosecond pulses are generated from an optical parametric amplifier directly driven by a Yb:fiber oscillator delivering 100\&\#x00A0;fs pulses at 1036 nm. The process is seeded by a stable supercontinuum obtained from a photonic crystal fiber. We use a single pass through a 3 mm, magnesium oxide-doped, periodically poled LiNbO3 downconversion crystal to produce a near-IR pulse train with a remarkable power stability of 1.4 % (RMS) during one hour. Tuning is achieved by the temperature and the poling period of the nonlinear crystal.}},
  author       = {{Mundry, J. and Lohrenz, J. and Betz, M.}},
  journal      = {{Applied Optics}},
  keywords     = {{Infrared and far-infrared lasers, Ultrafast lasers, Nonlinear optics, parametric processes, Parametric oscillators and amplifiers, Femtosecond pulses, Fiber lasers, Fused silica, Laser systems, Photonic crystal fibers, Pulse propagation}},
  number       = {{11}},
  pages        = {{3104--3108}},
  publisher    = {{OSA}},
  title        = {{{Tunable femtosecond near-IR source by pumping an OPA directly with a 90 MHz Yb:fiber source}}},
  doi          = {{10.1364/AO.56.003104}},
  volume       = {{56}},
  year         = {{2017}},
}