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  • Defect reconstruction by non-destructive testing with laser induced ultrasonic detection 

    Mohamed Selim, Hossameldin; Delgado Prieto, Miquel; Trull Silvestre, José Francisco; Pico Vila, Rubén; Romeral Martínez, José Luis; Cojocaru, Crina (2020-02)
    Article
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    This work envisages a detailed study of two-dimensional defect localization and reconstruction, using laser generated ultrasound and its application as a remotely controlled non-destructive testing method. As an alternative ...

  • Machine learning algorithms for predicting the amplitude of chaotic laser pulses 

    Amil Marletti, Pablo; Cornelles Soriano, Miguel; Masoller Alonso, Cristina (Institute of Physics (IOP), 2019-11-12)
    Article
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    Forecasting the dynamics of chaotic systems from the analysis of their output signals is a challenging problem with applications in most fields of modern science. In this work, we use a laser model to compare the performance ...

  • Gain-through-filtering enables tuneable frequency comb generation in passive optical resonators 

    Bessin, Florent; Perego, Auro M.; Staliunas, Kestutis; Turitsyn, Sergei K.; Kudlinski, Alexandre; Conforti, Matteo; Mussot, Arnaud (2019-10-03)
    Article
    Open Access
    Optical frequency combs (OFCs), consisting of a set of phase-locked, equally spaced laser frequency lines, have enabled a great leap in precision spectroscopy and metrology since seminal works of Hänsch et al. Nowadays, ...

  • Photonic crystal spatial filters fabricated by femtosecond pulsed Bessel beam 

    Gailevicius, Darius; Purlys, Vytautas; Staliunas, Kestutis (2019-10-15)
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    We propose and experimentally demonstrate femtosecond direct laser writing with Bessel beams for the fabrication of photonic crystals with spatial filtering functionality. Such filters are mechanically stable, of small (of ...

  • Beam-combining scheme of high-power broad-area semiconductor lasers with Lyot-filtered reinjection: modeling, simulations, and experiments 

    Brée, Carsten; Raab, Volker; Montiel Ponsoda, Joan; Staliunas, Kestutis (2019-07-01)
    Article
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    A brightness- and power-scalable polarization beam-combining scheme for high-power, broad-area semiconduc-tor laser diodes is investigated numerically and experimentally. To achieve the beam combining, we employ Lyot-filtered ...

  • Photonic crystal spatial filtering in broad aperture diode laser 

    Gawali, Sandeep Babu; Gailevicius, Darius; Garre Werner, Guillermo; Purlys, Vytautas; Cojocaru, Crina; Trull Silvestre, José Francisco; Montiel Ponsoda, Joan; Staliunas, Kestutis (2019-10-02)
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    Broad aperture semiconductor lasers usually suffer from low spatial quality of the emitted beams. Due to the highly compact character of such lasers, the use of conventional intracavity spatial filters is problematic. We ...

  • Study of second and third harmonic generation from an indium tin oxide nanolayer: Influence of nonlocal effects and hot electrons 

    Rodríguez Suñé, Laura; Escalora, M.; Johnson, Allan; Cojocaru, Crina; Akozbek, Neset; Coppens, Zachary; Perez Salinas, Daniel; Wall, Simon; Trull Silvestre, José Francisco (2020-01-03)
    Article
    Open Access
    We report comparative experimental and theoretical studies of the second and third harmonic generation from a 20 nm-thick indium tin oxide layer in proximity of the epsilon-near-zero condition. Using a tunable optical ...

  • Outlier Mining Methods Based on Graph Structure Analysis 

    Amil Marletti, Pablo; Almeira, Nahuel; Masoller Alonso, Cristina (Frontiers Media SA, 2019-11-26)
    Article
    Open Access
    Outlier detection in high-dimensional datasets is a fundamental and challenging problem across disciplines that has also practical implications, as removing outliers from the training set improves the performance of machine ...

  • Extreme-ultraviolet coherent pulse amplification in argon 

    Serrat Jurado, Carles; Seres, Jozsef; Seres, Enikoe; Namba, Shinichi (2019-06-25)
    Article
    Open Access
    The amplification of ultrashort extreme-ultraviolet (XUV) pulses in argon in high-order harmonic generation processes is studied by using the time-dependent Schrödinger equation in the spin-free one-active-electron and ...

  • Comparing the dynamics of periodically forced lasers and neurons 

    Tiana Alsina, Jordi; Quintero Quiroz, Carlos Alberto; Masoller Alonso, Cristina (2019-10-21)
    Article
    Open Access
    Neuromorphic photonics is a new paradigm for ultra-fast neuro-inspired optical computing that canrevolutionize information processing and artificial intelligence systems. To implement practicalphotonic neural networks is ...

  • Resonant, broadband, and highly efficient optical frequency conversion in semiconductor nanowire gratings at visible and UV wavelengths 

    Escalora, M.; Trull Silvestre, José Francisco; Cojocaru, Crina; Vincenti, M. A.; Carletti, Luca; Ceglia, Domenico de; Akozbek, Neset; De Angelis, C. (2019-08-01)
    Article
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    Using a hydrodynamic approach, we examine bulk- and surface-induced second- and third-harmonic generationfrom semiconductor nanowire gratings having a resonant nonlinearity in the absorption region. We demonstrateresonant, ...

  • Experimental characterization of the speckle pattern at the output of a multimode optical fiber 

    Halpaap, Donatus; Tiana Alsina, Jordi; Vilaseca Ricart, Meritxell; Masoller Alonso, Cristina (2019-09-30)
    Article
    Open Access
    Speckle patterns produced by coherent waves interfering with each other are undesirable in many imaging applications (for example, in laser projection systems) but on the other hand, they contain useful information that ...

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