Volume 13 Issue 8, August 2019

Volume 13 Issue 8

Echo-enabled free-electron lasers

Artistic impression of first lasing from a soft X-ray free-electron laser that uses echo-enabled harmonic generation. The development allows the generation of intense, fully coherent, multicolour, laser-like pulses with wavelengths extending into the water window (2–4 nm).

See Ribič et al.

Image: Elettra Sincrotrone Trieste, Art by Basiq. Cover Design: Bethany Vukomanovic

Comment

  • Comment |

    The Shockley–Queisser model is a landmark in photovoltaic device analysis by defining an ideal situation as reference for actual solar cells. However, the model and its implications are easily misunderstood. Thus, we present a guide to help understand and to avoid misinterpreting it.

    • Jean-Francois Guillemoles
    • , Thomas Kirchartz
    • , David Cahen
    •  & Uwe Rau
  • Comment |

    As a pioneer in the research on ultra-high-quality dielectric microresonators and their applications in nonlinear optics, frequency metrology and laser science, Mikhail Gorodetsky is badly missed.

    • Igor Bilenko
    • , Vladimir Ilchenko
    • , Farid Khalili
    •  & Tobias J. Kippenberg

    Collection:

News & Views

  • News & Views |

    Judicious scaling of the waveguide properties of a simple hollow capillary fibre filled with helium allows for powerful pulse temporal compression down to the sub-femtosecond level, further enabling the efficient generation of ultrafast ultraviolet light.

    • Benjamin Wetzel
    •  & Fetah Benabid
  • News & Views |

    Modulation of light by external waves is an essential function in any photonics-based system. Using an integrated plasmonic approach, the speed of modulation of 1.55-μm waves has now been extended to the ‘low’ THz band.

    • Guillaume Ducournau
  • News & Views |

    Increased bandwidth and fluctuations are hurdles on the path towards generating intense fully coherent X-ray free-electron laser output. A recent experiment at FERMI Trieste demonstrated that these difficulties can be overcome by an approach called echo-enabled harmonic generation.

    • Li Hua Yu
    •  & Timur Shaftan
  • News & Views |

    High-efficiency, time-domain, near-infrared fluorophores provide multiplexed colour channels for distinct deep bioimaging.

    • Shoujun Zhu
    •  & Xiaoyuan Chen

Letters

  • Letter |

    A high-speed wireless THz communication link is seamlessly integrated into a fibre-optic network. The demonstration relies on an ultra-broadband modulator exploiting two-dimensionally localized gap plasmons for direct conversion of the THz signals to the optical domain.

    • S. Ummethala
    • , T. Harter
    • , K. Koehnle
    • , Z. Li
    • , S. Muehlbrandt
    • , Y. Kutuvantavida
    • , J. Kemal
    • , P. Marin-Palomo
    • , J. Schaefer
    • , A. Tessmann
    • , S. K. Garlapati
    • , A. Bacher
    • , L. Hahn
    • , M. Walther
    • , T. Zwick
    • , S. Randel
    • , W. Freude
    •  & C. Koos
  • Letter |

    By time-shifting short-pulse excitation photon energy into prolonged luminescent emission in the time domain, both the number of light signal transducers in sub-15 nm nanoparticles and the near-infrared-in to near-infrared-out conversion efficiency can be maximized, advancing in vivo optical bioimaging.

    • Yuyang Gu
    • , Zhiyong Guo
    • , Wei Yuan
    • , Mengya Kong
    • , Yulai Liu
    • , Yongtao Liu
    • , Yilin Gao
    • , Wei Feng
    • , Fan Wang
    • , Jiajia Zhou
    • , Dayong Jin
    •  & Fuyou Li

Articles

  • Article |

    The photo-instability of perovskite solar cells is investigated and controlled by the use of a passivation strategy.

    • Silvia G. Motti
    • , Daniele Meggiolaro
    • , Alex J. Barker
    • , Edoardo Mosconi
    • , Carlo Andrea Riccardo Perini
    • , James M. Ball
    • , Marina Gandini
    • , Min Kim
    • , Filippo De Angelis
    •  & Annamaria Petrozza
  • Article |

    Optical soliton dynamics in large-core hollow capillary fibres is demonstrated. The findings enable the scaling of soliton effects by several orders of magnitude to the multi-millijoule energy and terawatt peak power levels, and open up opportunities for new-generation table-top light sources for ultrafast strong-field physics and advanced spectroscopy.

    • John C. Travers
    • , Teodora F. Grigorova
    • , Christian Brahms
    •  & Federico Belli
  • Article |

    Echo-enabled harmonic generation in a free-electron laser enables 45th harmonic pulses from a 264 nm wavelength seed, yielding 5.9 nm wavelength coherent output.

    • Primož Rebernik Ribič
    • , Alessandro Abrami
    • , Laura Badano
    • , Maurizio Bossi
    • , Hans-Heinrich Braun
    • , Niky Bruchon
    • , Flavio Capotondi
    • , Davide Castronovo
    • , Marco Cautero
    • , Paolo Cinquegrana
    • , Marcello Coreno
    • , Marie Emmanuelle Couprie
    • , Ivan Cudin
    • , Miltcho Boyanov Danailov
    • , Giovanni De Ninno
    • , Alexander Demidovich
    • , Simone Di Mitri
    • , Bruno Diviacco
    • , William M. Fawley
    • , Chao Feng
    • , Mario Ferianis
    • , Eugenio Ferrari
    • , Laura Foglia
    • , Fabio Frassetto
    • , Giulio Gaio
    • , David Garzella
    • , Amin Ghaith
    • , Fabio Giacuzzo
    • , Luca Giannessi
    • , Vanessa Grattoni
    • , Sandi Grulja
    • , Erik Hemsing
    • , Fatma Iazzourene
    • , Gabor Kurdi
    • , Marco Lonza
    • , Nicola Mahne
    • , Marco Malvestuto
    • , Michele Manfredda
    • , Claudio Masciovecchio
    • , Paolo Miotti
    • , Najmeh S. Mirian
    • , Ivaylo Petrov Nikolov
    • , Giuseppe Maria Penco
    • , Gregory Penn
    • , Luca Poletto
    • , Mihai Pop
    • , Eduard Prat
    • , Emiliano Principi
    • , Lorenzo Raimondi
    • , Sven Reiche
    • , Eléonore Roussel
    • , Roberto Sauro
    • , Claudio Scafuri
    • , Paolo Sigalotti
    • , Simone Spampinati
    • , Carlo Spezzani
    • , Luca Sturari
    • , Michele Svandrlik
    • , Takanori Tanikawa
    • , Mauro Trovó
    • , Marco Veronese
    • , Davide Vivoda
    • , Dao Xiang
    • , Maurizio Zaccaria
    • , Dino Zangrando
    • , Marco Zangrando
    •  & Enrico Massimiliano Allaria
  • Article |

    The combined technique of dual-comb multi-heterodyne detection and Fourier-transform analysis allows simultaneous acquisition and monitoring of the phase pattern of a generic frequency comb demonstrating the high degree of coherence of the emission of two quantum cascade laser frequency combs.

    • Francesco Cappelli
    • , Luigi Consolino
    • , Giulio Campo
    • , Iacopo Galli
    • , Davide Mazzotti
    • , Annamaria Campa
    • , Mario Siciliani de Cumis
    • , Pablo Cancio Pastor
    • , Roberto Eramo
    • , Markus Rösch
    • , Mattias Beck
    • , Giacomo Scalari
    • , Jérôme Faist
    • , Paolo De Natale
    •  & Saverio Bartalini
  • Article |

    The polarization structure around polarization singularities can exhibit arbitrary fractional rotations when tracing around the singularity, due to an underlying topology of a torus knot imprinted by the chosen ratio of frequencies contained in the light beam.

    • Emilio Pisanty
    • , Gerard J. Machado
    • , Verónica Vicuña-Hernández
    • , Antonio Picón
    • , Alessio Celi
    • , Juan P. Torres
    •  & Maciej Lewenstein
  • Article |

    By combining a single-photon time-of-flight camera with computational processing of the spatial and full temporal photon distribution data, an object embedded inside a strongly diffusive medium can be imaged over more than 80 transport mean free paths in a contactless manner on the timescale of the order of 1 s.

    • Ashley Lyons
    • , Francesco Tonolini
    • , Alessandro Boccolini
    • , Audrey Repetti
    • , Robert Henderson
    • , Yves Wiaux
    •  & Daniele Faccio

Amendments & Corrections