Christophe Dorrer

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1. Abstract Current laser beam shapers such as those used in the OMEGA EP laser system for spatial gain precompensation are made of small metal pixels arranged in a pattern to create a beam shaping device. Laser beam shapers can also be made from liquid crystals (LCs). Because of their unique properties, LCs can be oriented so that they transmit, block, or(More)
Using sonograms and phase retrieval we experimentally investigate the pattern dependence of the amplitude and phase dynamics, the linewidth enhancement factor, and the chirp of a data-modulated 1.55µm vertical-cavity surface-emitting laser (VCSEL). 1 Introduction Vertical-cavity surface-emitting lasers (VCSELs) operating at a wavelength of 1.55µm are new(More)
Cascaded nonlinearities are theoretically and experimentally investigated for intracavity nonlinearity compensation in a Nd:YLF regenerative amplifier. Spectral broadening is significantly reduced, in agreement with simulations, allowing for efficient amplification in a Nd:YLF power amplifier.
Radially polarizing liquid crystal (LC) devices aligned optically were investigated for applications in laser technology. Presently, radially polarized beams are generated through complex laser resonator configurations or buffing of LC alignment layers. Optically aligned LC devices offer several advantages over these methods, including their simple(More)
Thin-foil targets were irradiated with high-power (1 ≤ P(L) ≤ 210 TW), 10-ps pulses focused to intensities of I>10(18) W/cm(2) and studied with K-photon spectroscopy. Comparing the energy emitted in K photons to target-heating calculations shows a laser-energy-coupling efficiency to hot electrons of η(L-e) = 20 ± 10%. Time-resolved x-ray emission(More)
Methods for the characterization of the time-dependent electric field of short optical pulses are reviewed. The representation of these pulses in terms of correlation functions and time-frequency distributions is discussed, and the strategies for their characterization are explained using these representations. Examples of the experimental implementations(More)
The concept of spectral phase diversity is proposed and applied to the temporal characterization of optical pulses. The experimental trace is composed of the measured power of a plurality of ancillary optical pulses derived from the pulse under test by adding known amounts of chromatic dispersion. The spectral phase of the pulse under test is retrieved by(More)