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Showing 1–11 of 11 results
Advanced filters: Author: Marco Piccardo Clear advanced filters

  • Producing pulses in the mid-IR often requires bulky sources and has been inaccessible with compact and versatile quantum cascade lasers (QCLs). Here, the authors demonstrate actively mode-locked, mid-IR QCL operation at room temperature.

    • Johannes Hillbrand
    • Nikola Opačak
    • Benedikt Schwarz
    ResearchOpen Access
    Nature Communications
    Volume: 11, P: 1-7

  • Wave destabilization is demonstrated in semiconductor ring lasers operating at low pumping levels, where ultrafast gain recovery leads to the emergence of a frequency comb regime owing to phase turbulence.

    • Marco Piccardo
    • Benedikt Schwarz
    • Federico Capasso
    Research
    Nature
    Volume: 582, P: 360-364

  • New fully integrated semiconductor laser architectures are shown to be able to generate bright and background-free picosecond solitons at GHz repetition rates in the mid-infrared range.

    • Dmitry Kazakov
    • Theodore P. Letsou
    • Federico Capasso
    Research
    Nature
    Volume: 641, P: 83-89

  • Introduction of a diffractive axicon in a pulse shaper enables imparting topological–spectral correlation to ultrafast pulses over 200 nm in the visible region and with topological charges up to 80.

    • Marco Piccardo
    • Michael de Oliveira
    • Antonio Ambrosio
    Research
    Nature Photonics
    Volume: 17, P: 822-828

  • Self-starting harmonic frequency comb generation with a THz repetition rate in a quantum cascade laser is demonstrated. The mode spacing uniformity is verified to within 5 × 10−12 parts of the central frequency. The findings extend the range of applications of quantum cascade laser frequency combs.

    • Dmitry Kazakov
    • Marco Piccardo
    • Federico Capasso
    Research
    Nature Photonics
    Volume: 11, P: 789-792

  • Multifunctional active mid-infrared ring resonators and directional couplers with quantum cascade laser cores allow electrical control of resonant frequency and quality factors, tunable filtering and frequency comb generation.

    • Dmitry Kazakov
    • Theodore P. Letsou
    • Federico Capasso
    ResearchOpen Access
    Nature Communications
    Volume: 15, P: 1-8

  • Free-running stable optical dissipative solitons, called Nozaki–Bekki solitons, are created in a ring semiconductor laser; their spontaneous formation with tuning of laser bias eliminates the need for an external optical pump.

    • Nikola Opačak
    • Dmitry Kazakov
    • Benedikt Schwarz
    Research
    Nature
    Volume: 625, P: 685-690

  • Resonators are key components in optics. In this work, the authors introduce a class of optical resonators with distinctly different properties from conventional resonators, allowing fundamental design trade-offs to be circumvented.

    • Vincent Ginis
    • Ileana-Cristina Benea-Chelmus
    • Federico Capasso
    ResearchOpen Access
    Nature Communications
    Volume: 14, P: 1-11

  • The angular dependence is a well-known issue in metasurface engineering. Here the authors introduce a supercell metasurface able to implement multiple independent functions under large deflection angles with high efficiency, leading to a wavelength tunable laser with arbitrary wavefront control.

    • Christina Spägele
    • Michele Tamagnone
    • Federico Capasso
    ResearchOpen Access
    Nature Communications
    Volume: 12, P: 1-10