Anatoli Ulmer, TU Berlin, Germany

Browse our March issue

Featuring research findings on femtosecond x-ray imaging, optical upconversion, bright quantum-dot LEDs, giant multi-photon absorption and a tribute to the Nobel Prize winner Nicolaas Bloembergen.

Latest Research

  • Article |

    By employing difference-frequency generation, a mid-infrared dual-comb spectrometer covering the 2.6 to 5.2 µm range is demonstrated with comb-tooth resolution, sub-MHz frequency precision and accuracy, and a spectral signal-to-noise ratio as high as 6,500.

    • Gabriel Ycas
    • , Fabrizio R. Giorgetta
    • , Esther Baumann
    • , Ian Coddington
    • , Daniel Herman
    • , Scott A. Diddams
    •  & Nathan R. Newbury
  • Article |

    Using silicon nitride waveguides processed by plasma-enhanced chemical vapour deposition, full integration of ultrahigh-Q resonators with other photonic devices is now possible, representing a critical advance for future photonic circuits and systems.

    • Ki Youl Yang
    • , Dong Yoon Oh
    • , Seung Hoon Lee
    • , Qi-Fan Yang
    • , Xu Yi
    • , Boqiang Shen
    • , Heming Wang
    •  & Kerry Vahala
  • Letter |

    By combining a chromatic focusing system with chirped laser pulses, the spatiotemporal distribution of the laser pulse is controlled in the focal region. The focal spot propagates over nearly 100 times its Rayleigh length at any velocity.

    • Dustin H. Froula
    • , David Turnbull
    • , Andrew S. Davies
    • , Terrance J. Kessler
    • , Dan Haberberger
    • , John P. Palastro
    • , Seung-Whan Bahk
    • , Ildar A. Begishev
    • , Robert Boni
    • , Sara Bucht
    • , Joseph Katz
    •  & Jessica L. Shaw

News & Comment

  • News & Views |

    Phosphors often suffer luminescence quenching at elevated temperatures. Now, thermal quenching can be combated with surface phonon-assisted energy transfer, enabling the luminescence of ultrasmall upconversion nanophosphors to be dramatically enhanced.

    • Liangliang Liang
    •  & Xiaogang Liu
  • Editorial |

    Scientific claims, particularly those related to devices, are often backed up by standardized characterization. In fields without accepted standards, is it beneficial to strive to establish them?

  • News & Views |

    The observation of terahertz nonlinearities in graphene and quantum wells and the emission of terahertz waves from water show that terahertz science is still a fertile area of research that is full of surprises.

    • Noriaki Horiuchi

For Authors

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