Spatio-temporal characterization of ultrashort pulses diffracted by circularly symmetric hard-edge apertures: theory and experiment

Mendoza-Yero, Omel; Alonso, Benjamín González; Varela, O.; Mínguez‐Vega, Gladys; Sola, Íñigo J.; Láncis, Jesús; Climent, Vicent; Roso, L.

doi:10.1364/oe.18.020900

Cited by 24 publications

(15 citation statements)

References 31 publications

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“…Regarding the curvature of the pulse front, it is the same as that of a divergent wave before and after the focus, being flatter after the focus. For the focus position (z z 0 ), the spatiotemporal intensity corresponds to the far-field structure, already observed in [20], with a main broadened central peak, and a train of pulses in the wings coming from the ring structure.…”

Section: Spatiotemporal Dynamicsmentioning

confidence: 66%

“…The optical system depicted in Fig. 1 is very simple, robust, and reliable and has been used before for the study of DOEs [20] and the propagation dynamics of a laser filament [16]. In our experiment, the test beam was focused by a kinoform DL, whose focus was scanned in the transverse direction to the propagation axis with a spatial resolution of 4 μm (fiber mode diameter).…”

Section: Methodsmentioning

confidence: 99%

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Frequency resolved wavefront retrieval and dynamics of diffractive focused ultrashort pulses

Alonso¹,

Borrego-Varillas²,

Mendoza-Yero³

et al. 2012

Frontiers in Optics 2012/Laser Science XXVIII

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In this work we demonstrate the ability of the spatiotemporal characterization technique STARFISH to retrieve the wavelength dependent wavefront of focused ultrashort laser pulses. The high resolution achievable with this technique allows measuring the wavefront at the focal spot. In particular, the method is applied to study the effects of focusing with a kinoform diffractive lens. The evolution from converging to diverging wavefronts as the pulse propagates along the focal region is analyzed for each wavelength. The spatiotemporal intensity and spatially resolved spectrum structure of the pulses, as well as their profiles on axis, are also presented. Numerical simulations of the propagation of such pulses confirm the experimental results.

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Section: Spatiotemporal Dynamicsmentioning

confidence: 66%

Section: Methodsmentioning

confidence: 99%

Frequency resolved wavefront retrieval and dynamics of diffractive focused ultrashort pulses

Alonso¹,

Borrego-Varillas²,

Mendoza-Yero³

et al. 2012

Frontiers in Optics 2012/Laser Science XXVIII

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“…So far, the production of ultra-short pulsed laser and its propagation characteristics through the linear or nonlinear media have been studied by many researches [14][15][16]. As we know, for the ultrashort pulsed laser, the light beam contains abundant spectrum components.…”

Section: Introductionmentioning

confidence: 99%

Temporal and time-averaged Talbot effect of grating

Wang

Zhang

et al. 2015

Optik

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“…Spatially and temporally resolved measurement of the complex spatiotemporal light field at the multifocal pattern was carried out by using a recently reported technique that is based on the spatiotemporal amplitude and phase reconstruction by Fourier transform of the interference spectra of the optical beams (STARFISH) [19,20]. Also, the ability of the diffractive lens pair to compensate for energy spreading both in space and time of the foci is experimentally tested.…”

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confidence: 99%

Multibeam second-harmonic generation by spatiotemporal shaping of femtosecond pulses

et al. 2012

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We present a technique for efficient generation of the second-harmonic signal at several points of a nonlinear crystal simultaneously. Multispot operation is performed by using a diffractive optical element that splits the near-infrared light of a mode-locked Ti:sapphire laser into an arbitrary array of beams that are transformed into an array of foci at the nonlinear crystal. We show that, for pulse temporal durations under 100 fs, spatiotemporal shaping of the pulse is mandatory to overcome chromatic dispersion effects that spread both in space and time the foci showing a reduced peak intensity that prevents nonlinear phenomena. We experimentally demonstrate arbitrary irradiance patterns for the second-harmonic signal consisting of more than 100 spots with a multipass amplifier delivering 28 fs, 0.8 mJ pulses at 1 kHz repetition rate. © 2012 Optical Society of America OCIS codes: 090.1970, 320.7100, 320.7110. Current high-gain femtosecond amplifiers running at kilohertz repetition rate provide output pulse energies at the millijoule level that overpass by a huge amount the required energy for some applications. For instance, the pulse energies used at the low fluence regime for surface micro-and nanostructuring of materials (e.g., metals and semiconductors) are often <10 μJ. Similar values are required for pulse processing of dielectric solids (fused silica) or liquid resins [1]. Also, pulsed Ti:sapphire lasers offer abundant light for multiphoton excitation in nonlinear microscopy with 90-95% of the light discarded. The use of multiple beams in parallel to take advantage of the full power of the amplifier system has been proposed and demonstrated in fields as material processing [2]-[8] and multiphoton microscopy [9][10][11]. Such methods rely on the use of diffractive optical elements (DOEs) or microlens arrays to divide the laser beam into several beamlets that, after focusing, scan the sample simultaneously. DOEs are usually the choice as they allow dynamic codification. The use of DOEs however is problematic for laser pulses in the femtosecond regime. Several authors have reported an increase of the eccentricity of the focused spots with the transverse distance at the irradiation plane that is attributed to the finite bandwidth of the laser source [3,7,9]. For example a 100 fs pulse at center wavelength of 790 nm has a bandwidth of approximately 15 nm or 1.9% of the center wavelength. This situation is even worse for shorter pulse durations. More interestingly, the pulse is also stretched in time as a result of the propagation time difference between pulses crossing the DOE at different transverse positions (angular dispersion). This effect cannot be precompensated with the chirping of the original pulse as group-velocitydispersion broadening. As a result, there is an inherent drop of the peak intensity inhomogeneously distributed over the working area. This fact prevents nonlinear interactions in outer regions from the axis. Note that, for instance, the second-harmonic (SH) signal increases inversely...

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Spatio-temporal characterization of ultrashort pulses diffracted by circularly symmetric hard-edge apertures: theory and experiment

Cited by 24 publications

References 31 publications

Frequency resolved wavefront retrieval and dynamics of diffractive focused ultrashort pulses

Frequency resolved wavefront retrieval and dynamics of diffractive focused ultrashort pulses

Temporal and time-averaged Talbot effect of grating

Multibeam second-harmonic generation by spatiotemporal shaping of femtosecond pulses

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