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We demonstrate highly efficient Terahertz production and absolute phase control in the hardly accessible THz frequency gap by optical rectification in organic crystals leading to single-cycle field oscillations beyond 150 MV/m and 0.5 Tesla.
We present the first streaking of an attosecond pulse train using an intense THz field. Streaking with THz enables temporal characterization of the full pulse train in a single shot measurement.
We demonstrate non-resonant magnetization dynamics in the ferromagnetic cobalt thin film induced by a high-field Terahertz pulse. The magnetization dynamics are coherent and exactly follow the THz carrier oscillations.
We present a novel and highly efficient temporal pulse shaping technique for the generation of flattop-like picosecond pulses in the deep UV. Using standard sum frequency generation (SFG) of a Ti:sapphire laser but with a pair of properly chirped beams prior to frequency-conversion, we were able to achieve picosecond pulses in the deep UV with a spectral width up to ten times larger than the non-linear...
We demonstrate an ultrastable high-power laser system providing transform-limited 20-to-100 fs pulses at a tunable central wavelength. Subsequent frequency-conversion provides wavelength-tunable second and third harmonic radiation with up to 3.7 mJ.
We report on our investigation of THz emission from femtosecond filaments in argon and propose a single-shot scheme for determination of the absolute carrier envelope phase with a 2-π ambiguity.
We demonstrate a 10-fold increase in high-order harmonic generation in argon and neon for long (25 fs) and short (5 fs) pulses by optimizing the gas distribution in the laser interaction zone.
We study polarization state dynamics, white-light generation and self-compression in femtosecond filaments for linear, circular and elliptically polarized input light. For elliptically polarized input laser light strong nonlinear elliptic polarization rotation is observed during filamentation.
We demonstrate a 10-fold increase in high-order harmonic generation in argon and neon for long (25 fs) and short (5 fs) pulses by optimizing the gas distribution in the laser interaction zone.
We experimentally and numerically investigate supercontinuum generation produced by circularly polarized femtosecond filaments in argon for broadband self-compression. A comparison with linear polarization indicates greater beam pointing stability and extended supercontinuum generation due to varied spatial-temporal characteristics.
We report on our investigation of THz emission from femtosecond filaments in argon and propose a single-shot scheme for determination of the absolute carrier envelope phase with a 2-π ambiguity.
We experimentally and numerically investigate supercontinuum generation produced by circularly polarized femtosecond filaments in argon for broadband self-compression. A comparison with linear polarization indicates greater beam pointing stability and extended supercontinuum generation due to varied spatial-temporal characteristics.
We report on our investigation of THz emission from femtosecond filaments in argon and propose a single-shot scheme for determination of the absolute carrier envelope phase with a 2-pi ambiguity.
We study polarization state dynamics, white-light generation and self-compression in femtosecond filaments for linear, circular and elliptically polarized input light. For elliptically polarized input laser light strong nonlinear elliptic polarization rotation is observed during filamentation.
We demonstrate a 10-fold increase in high-order harmonic generation in argon and neon for long (25 fs) and short (5 fs) pulses by optimizing the gas distribution in the laser interaction zone.
We present an adaptive technique for the formation of multiple co-propagating and stationary filaments in a gaseous medium. Wavefront shaping of the initial beam is performed using a deformable mirror to achieve a complete two-dimensional control of the multi-spot intensity pattern in the laser focus. The spatial organization of these intensity spots yields reliable formation of up to five stable...
We demonstrate filamentation at 2 μm using carrier-envelope phase (CEP) stabilized 55 fs, 330 μJ pulses from an OPA. The ultra-broadband output is self-compressed below 3-optical cycles with 270 μJ and preserves the CEP offset.
Multiple femtosecond filamentation (MF) are spatially organized by polarization control. Spatio-temporal characterization demonstrates a stable multi-filament pattern and compression to ultrashort pulses in individual co-propagating filaments.
A different and highly robust scheme is described in which optimization of the pulse compression involves a distinct sequential two plasma-filament structure, and where the dynamics coincide with a blue-shifted compressible tail on-axis, and a red-shifted background. During the first filament, the spectra is broadened off-axis due to the off-axis peak intensity. The formation of the second filament...
We demonstrate theoretically and experimentally a robust method based on sequential filamentation to optimize compression of high-energy pulses in gases. We gain insight into this process by comparing compression dynamics for linear- and circularly-polarized pulses.
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