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Frequency Resolved Optical Gating (FROG) is a technique to measure ultrashort laser pulses [1]. It requires the measurement of a spectrally resolved autocorrelation, in the case of SHG FROG by using non-collinear second harmonic generation. The pulse amplitude and phase can then be retrieved numerically from the measurement.
Despite recent advances in optical ultrafast measurement, simultaneous measurement of amplitude and phase of fast optical fields having complex evolutions over large time window remains a largely open problem. Here, we demonstrate two novel and complementary techniques that allow in particular the single-shot recordings of amplitude and phase of irregular waves with a high temporal resolution over...
The rapid development of microfluidic circuits and lab-on-chip devices for cell studies opened new perspectives for cellular biology, in particular for the biophysics and biomechanics of single cells. At the state of the art, a lot of attention is being paid to the possible integration of optical and acoustic actuators within microfluidic system because they both provide a contactless way for cell...
Quantum teleportation is an important building block of quantum information processing. For practical applications, a quantum teleporter with the potential to include quantum error correction should be realized.
Micro-rheology recently emerged as a promising technique for investigating the viscoelastic properties of complex fluids at a molecular scale. The study of the rheological properties of polymer solutions and reversible gels is more complex than that of molecular fluids, because these fluids commonly exhibit nonlinear viscosity behaviour. The research activity that we report about has been dedicated...
Increasing industrial precision requires innovative and highly sensitive methods for non-contact measurement, which can be used to measure distances to objects, as well as the relevant parameters such as displacement and surface profiles. There are various optical techniques for distance measurement which are used depending on required accuracy, working range and applications. The most common techniques...
There is much interest in the development of high power ultra-short fiber laser systems due to their significant properties and applications. Among them, Er-doped fiber lasers are showing more attention, especially in silicon processing and photovoltaic industries [1]. Chirp pulse amplification (CPA) is the most common approach to stablish high-power/high energy fiber lasers [2].
The complete characterisation of ultrashort optical pulses is a key capability in the design, optimisation and implementation of any ultrafast laser system or experiment and an accurate means to quantify the complex spectral or temporal amplitude of the field enables the maximum information to be extracted from dynamic measurements.
Stimulated Brillouin scattering (SBS) is the major factor that limits maximum peak power of single-frequency pulsed fiber laser systems. It should be noted that in the all-fiber format it is the passive fibers at the amplifier output (used as pigtails in isolator and etc) are those component that often has the smallest SBS threshold [1]. Thus, development of large mode area (LMA) passive fibers with...
Quantum Cascade Lasers (QCLs) have become one of the most used light sources in the Mid-IR. It has been demonstrated that QCLs can operate as frequency combs (FCs) [1] and that the performance of QCL FCs can be significantly improved by compensating for their waveguide dispersion using dielectric coating based Gires-Tournois interferometers [2]. However, the latter are incompatible with high optical...
MIR range Quantum Cascade Lasers (QCLs) find various sensing applications in security, health, gas sensing and spectral gas analysis. After some additional design and fabrication efforts, single mode or narrow band QCLs (DFB or grating-stabilized on external cavity) provide a direct access to spectral measurements of molecular fingerprints (ro-vibrational bands). However the simplest Fabry-Perot (FP)...
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