Jordi Tiana-Alsina

Super-pupil beam engineering for enhanced confinement of azimuthally polarized depletion beams

Costanza Agazzi, Nick Toledo-García, Estela Martín-Badosa, Mario Montes-Usategui et autres

Fluorescence depletion microscopy techniques require optical fields with a well-defined and spatially confined central intensity minimum to achieve sub-diffraction lateral resolution. Here, we present the design and experimental implementation of an azimuthally polarized, doughnut-shaped depletion beam based on super-pupil engineering principles. By …

Super-pupil beam engineering for enhanced confinement of azimuthally polarized depletion beams

Costanza Agazzi, Nick Toledo-García, Estela Martín-Badosa, Mario Montes-Usategui et autres

Fluorescence depletion microscopy techniques require optical fields with a well-defined and spatially confined central intensity minimum to achieve sub-diffraction lateral resolution. Here, we present the design and experimental implementation of an azimuthally polarized, doughnut-shaped depletion beam based on super-pupil engineering principles. By …

es (code pays fourni par la source)

Coherence characterization of multimode VCSELs via speckle contrast under optical feedback and bias variation

Sergi Torres, Jordi Tiana-Alsina, Cristina Masoller, Yanhua Hong

Optical feedback effects on the nonlinear dynamics of Vertical-Cavity SurfaceEmitting Lasers (VCSELs) have been extensively investigated; however, the effects of feedback on the spatial coherence properties of VCSEL emission have received less attention. In this work, we carry out an experimental quantitative …

Coherence characterization of multimode VCSELs via speckle contrast under optical feedback and bias variation

Sergi Torres, Jordi Tiana-Alsina, Cristina Masoller, Yanhua Hong

Optical feedback effects on the nonlinear dynamics of Vertical-Cavity SurfaceEmitting Lasers (VCSELs) have been extensively investigated; however, the effects of feedback on the spatial coherence properties of VCSEL emission have received less attention. In this work, we carry out an experimental quantitative …

Coherence characterization of multimode VCSELs via speckle contrast under optical feedback and bias variation

Sergi Torres Serra, Jordi Tiana-Alsina, Cristina Masoller, Yanhua Hong

Optical feedback effects on the nonlinear dynamics of vertical-cavity surface-emitting lasers (VCSELs) have been extensively investigated; however, the effects of feedback on the spatial coherence properties of VCSEL emission have received less attention. In this work, we carry out an experimental quantitative …

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Azimuthal super-pupil beam engineering for improved fluorescence depletion microscopy

Costanza Agazzi, Nick Toledo-García, Estela Martín-Badosa, Mario Montes et autres

es (code pays fourni par la source)

Generation and Characterization of Vector Beams with a Single SLM for Super-Resolution Microscopy

Nick Toledo-García, Estela Martín-Badosa, Artur Carnicer, Mario Montes-Usategui et autres

We present a method to generate vector beams using a single spatial light modulator (SLM) for depletion-based super-resolution microscopy techniques such as STED, RESOLFT, and subtraction microscopy. We demonstrate the generation of circularly polarized Laguerre-Gaussian LG01 beams and vector beams with spatially …

Invited - Experimental characterization of optical feedback and current modulation effects on the spatial coherence of a semiconductor laser

Maria Duque Gijon, Cristina Masoller, Jordi Tiana-Alsina

Semiconductor lasers are very sensitive to optical feedback. Here we study experimentally the effect of optical feedback on the spatial coherence of a diode laser using the speckle technique. Speckle is a noisy structure arising from the interference of coherent waves as …