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The unique combination of the LCLS x-ray laser with high-power nanosecond and femtosecond laser beams at the Matter of Extreme Conditions allows precision pump-probe studies of high energy density plasmas. For this purpose, we are building a new 200 TW laser system to measure and uncover the underlying physics mechanism that determine the interaction of ultra intense laser beams with matter. The repetition...
The design ideas of thin disk lasers will be explained in detail. Experimental results for continuous wave operation and for pulsed operation show the capability for building high power lasers with high efficiency and good beam quality, simultaneously. Modelling the thin disk laser behaviour shows the possible power and energy scalability.
The National Ignition Facility at Lawrence Livermore National Laboratory is a 1.8 MJ, 192 beam laser designed to produce the conditions of temperature and density in compressed deuterium-tritium ice which theory predicted would produce thermonuclear ignition. All of the exquisite technical requirements of the laser and the targets have been met. A comprehensive set of diagnostics has been installed...
Precise real time modulation of the laser energy flux during material processing enables the regulation of specific chemical/physical properties on a highly localized scale. The presentation focuses on a control-system architecture and its implementation that delivers well defined photon exposures at the proper location and time.
We demonstrate a cold-atom Raman laser that operates quasi-continuously with as few as 0.2 photons on average inside the cavity and with a single-atom Raman decay rate below 1 Hz. We demonstrate that the laser's coherence is primarily stored within the atoms, and consider the relationship between the Schawlow-Townes linewidth and the standard quantum limit on phase estimation using unentangled atoms...
We will be giving an overview on the development of the “ELI-beamline facility” built within the Extreme Light Infrastructure (ELI) project based on the European ESFRI (European Strategy Forum on Research Infrastructures) process.
I will review progresses of photonic crystal lasers, which are now recognized as an unprecedented type of lasers that can operate coherently in broad area, produce a tailored beam on demand, realize a beam steering functionality, etc.
We report on the generation of coherent N2+ emissions in a plasma string driven by two-color laser fields and measure their temporal structures. It is confirmed that the coherent emissions originate from seed-injected amplification.
We present the new regime of high-order harmonics generation by multi-TW femtosecond lasers irradiating gas jet targets. We describe new results concerning the off-axis XUV harmonics emission, angular distribution and source size.
We demonstrate bright high harmonic generation driven by UV lasers with ultra-high conversion efficiency approaching 10−3 and ultra-narrow single-harmonic bandwidth of ∼0.2%. The enhanced flux results from improved phase-matching combined with stronger single-atom yield.
An XUV continuum supporting 280 as isolated attosecond pulses is generated in argon with a 200 mJ, 17 fs Ti:Sapphire laser using the GDOG technique. The energy of the XUV pulse is over 100 nJ at generation location.
We demonstrate electron diffraction from a polycrystalline aluminum foil sample using 100 keV electron bunches generated from laser-driven plasma wakefield. Our proof-of-principle experiment shows the potential of high repetition rate, low energy electron pulses from laser wakefield accelerators for ultrafast electron diffraction applications.
Forward scattering of ionization from noble gases in ultrahigh intensities of 2×1019 W/cm2 is investigated. The observed strongly forward scattered photoionization is in agreement with classical field scattering employing the full nonparaxial laser field.
We have demonstrated amplitude modulation of terahertz quantum cascade lasers by means of the injection of near-infrared laser pulses. Injected 770nm and 1350nm laser pulses both strongly suppressed the output power.
A 2 MHz Yb fiber oscillator producing 320 nJ per pulse is developed. The laser is ideal for laser-induced breakdown spectroscopy, due to a low ablation threshold and clean atomic emission spectra.
We present a first realization of effective multi-dimensional laser mode-combs (hyper-combs), constructed by multi-frequency active mode-locking, mapped to the multi-dimensional spherical-model in statistical-mechanics (and provide its rare physical realization) with implications to ultrashort light-pulse generation.
We explore experimentally a new regime of operation for mode locking in a Ti:Sapphire laser with enhanced Kerr nonlinearity, where the threshold for pulsed operation is lowered below the threshold for continuous-wave operation.
Frequency noise and linewidth properties of different mid-infrared DFB-QCLs using buried-heterostructures and ridge waveguides are compared. The physical origin of frequency noise and the impact of the different lasers parameters are discussed.
A method for measuring optical thickness changes in a thin film using a single laser beam is proposed and demonstrated. Theory suggests that when a half plane phase shift is applied to a Gaussian laser beam, interference fringes appear in the far field which position varies with the amount of phase shift. By measuring fringe pattern displacements, we demonstrate detection of optical changes in microns-thick...
We have investigated non-uniformity of the lateral current density and lateral hole burning in Quantum Cascaded lasers, e.g., the current density in the mode center is 1.8 times that in the edge region.
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