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I present a new cross-correlation frequency resolved optical gating (X-FROG) algorithm, based on the principal components generalized projections (PCGP) algorithm that is fast, robust, and simple.
We present the latest results in extending dual-comb spectroscopy to two-photon resonances. By measuring two-photon excitation of rubidium vapor and water-dissolved fluorophores, we demonstrate both the high resolution and speed of the technique.
A refractive-index change is written inside an optical fiber close to the end face by femtosecond laser light. The induced phase change is measured by analyzing the far-field intensity profiles before and after the irradiation.
Under certain conditions, femtosecond lasers can be used to introduce self-organized nanogratings in the bulk of fused silica. Here, we report that the nanogratings orientation influences the induced stress distribution around laser affected zones.
We present time-resolved X-ray absorption measurements of vanadium dioxide using ionizations radiation generated by a femtosecond pulsed laser source in combination with superconducting microcalorimeters capable of measuring energies of individual radiation quanta.
We present a non-intrusive laser based technique for tagging flows. The femtosecond laser electronic excitation tagging (FLEET) is based on writing patterns in air and following the nitrogen pink afterglow.
Measurements and numerical simulations of the continuum created by laser filamentation in anomalous dispersion regime of fused silica allow us to identify the extreme blueshifted peak as an axial component of the conical emission.
We present experimental and numerical investigation of a new filamentation regime of mid-infrared femtosecond pulses in solids. Efficient emission of dispersive waves without fundamental spectrum broadening and continuum generation is observed in this regime.
Super-luminescent jet light is produced via disrupted conical emission excited by focused millijoule 50 fs laser pulses in air. Phase-matching requirement of four-wave mixing at specific diffraction angles is responsible for the observed phenomenon.
Absorption spectroscopy of NH3 at 9.1 μm is demonstrated with a quantum-cascade-laser absolutely referenced to a Tm-fiber frequency-comb. Highly-accurate spectroscopic parameters are retrieved by a multiple-line fitting approach applied to the spectral manifold.
A novel technique is introduced to characterize the nonlinear properties of organic dyes in solution. This technique uses the integrated liquid core optical fiber (i-LCOF) platform and is based on the spectral broadening of laser pulses due to self phase modulation (SPM).
We desorb polymer films from fused silica with a femtosecond laser and characterize the results by atomic force microscopy. Our study as a function of beam geometry and energy reveals two ways of achieving spatially controlled nanodesorption.
We measure self-compression of femtosecond laser pulses in an experiment using simple geometrical focusing onto a 100 μm gas plume at relativistic intensities. Stable and uniform self-compression from 36 fs to 16 fs is measured using second-harmonic-generation frequency-resolved optical gating.
Coherent phonon dynamics in metallic carbon nanotubes has been investigated by pump-probe spectroscopy using a 7.5-fs laser. High-frequency coherent phonons up to 100 THz have been observed including second-order modes due to the electronic resonances.
We report enhanced third-harmonic generation (THG) in graphene films from the near-to the mid-IR. Moreover, we use this process for few-cycle pulse measurements with the new technique of THG dispersion-scan.
We investigate the performance of the recently introduced “d-scan” technique for the characterization of ultrashort laser pulses by comparing it with a well-established technique (SPIDER). Good agreement is obtained from the two different measurements.
We propose a new technique for femtosecond pulse characterization — transient-grating self-referenced spectral interferometry. Using this technique, we built an extremely simple, alignment-free device and successfully sub-two-cycle 10-fs pulses at 1.75 μm.
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