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Browsing by Subject "Làsers semiconductors"

Now showing items 1-16 of 16

    • Abrupt transition from low-coherence to high-coherence radiation in a semiconductor laser with optical feedback 

      Duque Gijón, María; Masoller Alonso, Cristina; Tiana Alsina, Jordi (2023-01-19)
      Article
      Open Access
      Semiconductor lasers are very sensitive to optical feedback. Although it is well known that coherent feedback lowers the threshold of the laser, the characteristics of the transition from low-coherence radiation—dominated ...

    • Binary image classification using collective optical modes of an array of nanolasers 

      Tirabassi, Giulio; Ji, Kaiwen; Masoller Alonso, Cristina; Yacomotti, Alejandro M. (2022-09)
      Article
      Open Access
      Recent advancements in nanolaser design and manufacturing open up unprecedented perspectives in terms of high integration densities and ultra-low power consumption, making these devices ideal for high-performance optical ...

    • Characterizing the spike timing of a chaotic laser by using ordinal analysis and machine learning 

      Boaretto, Bruno R.; Macau, Elbert E.N.; Masoller Alonso, Cristina (Institute of Physics (IOP), 2024-04-01)
      Article
      Open Access
      Semiconductor lasers with optical feedback are well-known nonlinear dynamical systems. Under appropriate feedback conditions, these lasers emit optical pulses that resemble neural spikes. Influenced by feedback delay and ...

    • Dynamics of a semiconductor laser with feedback and modulation: experiments and model comparison 

      Tiana Alsina, Jordi; Masoller Alonso, Cristina (Optical Society of American (OSA), 2022-03-14)
      Article
      Open Access
      We study experimentally and numerically the dynamics of a semiconductor laser near threshold, subject to optical feedback and sinusoidal current modulation. The laser operates in the low frequency fluctuation (LFF) regime ...

    • Effect of current modulation on the coherence of a semiconductor laser with optical feedback 

      Duque Gijón, María; Masoller Alonso, Cristina; Tiana Alsina, Jordi (Optical Society of American (OSA), 2024-09-23)
      Article
      Open Access
      The use of laser light for illumination produces speckles that degrade image quality, and different strategies have been developed to mitigate speckle. Optical feedback can reduce the amount of speckle, since it can decrease ...

    • Entropy analysis of phase diffusion quantum entropy sources based on InP 

      Reñé Sapera, Joel (Universitat Politècnica de Catalunya, 2024-07-23)
      Master thesis
      Restricted access - confidentiality agreement

    • Modes in microchip lasers 

      Plukys, Matas; Gaizauskas, Eugenijus; Gailevicius, Darius; Staliunas, Kestutis (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2022)
      Conference report
      Restricted access - publisher's policy
      The transverse modes in microchip lasers (MCL) appear different from the classical mode theory, as the resonator consists of a set of plane mirrors (similar to semiconductor edge-emitting lasers and VCSELs). Then the ...

    • Non-Hermitian coupled semiconductor laser array 

      Herrero Simon, Ramon; Medina Pardell, Judith; Botey Cumella, Muriel; Staliunas, Kestutis (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2022)
      Conference report
      Open Access
      We propose and explore a stabilization mechanism of a semiconductor laser array based on asymmetric coupling between neighboring lasers. The stabilization scheme takes advantage of the symmetry breaking of non-Hermitian ...

    • Non-Hermitian modulations for stabilization of VCSEL, EEL and EEL arrays 

      Herrero Simon, Ramon; Benadouda Ivars, Salim; Botey Cumella, Muriel; Staliunas, Kestutis (2023)
      Conference report
      Restricted access - publisher's policy
      Semiconductor lasers and laser arrays emit temporally unstable and low spatial quality beams associated to intrinsic dynamical spatiotemporal instabilities. W e propose the simultaneous modulations of refractive index and ...

    • Permutation entropy-based characterization of speckle patterns generated by semiconductor laser light 

      Tirabassi, Giulio; Duque Gijón, María; Tiana Alsina, Jordi; Masoller Alonso, Cristina (2023-12)
      Article
      Open Access
      Semiconductor lasers with optical feedback are stochastic nonlinear systems that can display complex dynamics and abrupt changes when their operation conditions change. Even very small changes can lead to large variations ...

    • Phase Diffusion effects in InP semiconductor lasers 

      Martínez Pàmias, Berta (Universitat Politècnica de Catalunya, 2022-09-06)
      Master thesis
      Restricted access - confidentiality agreement

    • Quantifying the synchronization of the spikes emitted by coupled lasers 

      Tiana Alsina, Jordi; Masoller Alonso, Cristina (Institute of Physics (IOP), 2023-07-01)
      Article
      Open Access
      Synchronization phenomena is ubiquitous in nature, and in spite of having been studied for decades, it still attracts a lot of attention as is still challenging to detect and quantify, directly from the analysis of noisy ...

    • Quantum random number generation based on the polarization dynamics of VCSELs 

      Mir Pou, Blanca (Universitat Politècnica de Catalunya, 2022-06)
      Bachelor thesis
      Restricted access - confidentiality agreement
      Covenantee:   Quside
      Random numbers are essential in a great variety of applications ranging from stochastic simulations to secure communications. In this thesis, we report a technique for quantum random number generation based on the dynamics ...

    • Stabilization of laser emission by non-Hermitian potentials 

      Herrero Simon, Ramon; Benadouda Ivars, Salim; Botey Cumella, Muriel; Staliunas, Kestutis (Institute of Electrical and Electronics Engineers (IEEE), 2023)
      Conference report
      Open Access
      Light emission from single lasers and laser arrays can suffer from dynamical spatiotemporal instabilities leading to emitted beams temporally unstable and with low spatial quality. We propose a feasible stabilization ...

    • Stabilization of microlasers by non-Hermitian potentials 

      Herrero Simon, Ramon; Botey Cumella, Muriel; Benadouda Ivars, Salim; Akhter, Mohammad Nayeem; Staliunas, Kestutis (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2023)
      Conference report
      Open Access
      Vertical-cavity semiconductor lasers as well as single units or arrays of Edge Emitting Lasers suffer from dynamical spatiotemporal instabilities leading to temporally unstable and low spatial beam quality. We propose a ...

    • Timing jitter reduction in semiconductor lasers induced by optical injection 

      Duque Gijón, María; Quirce Teja, Ana; Tiana Alsina, Jordi; Masoller Alonso, Cristina; Valle Gutierrez, Ángel (2023-11-01)
      Article
      Open Access
      We present an experimental study of the effect of continuous-wave optical injection (OI) from a vertical-cavity surface-emitting laser (VCSEL) on the timing jitter of a gain-switched discrete-mode semiconductor laser (DML). ...