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 2017-06-1211:40 [PUBDB-2017-04701] Journal Article et al Er-Fiber laser enabled, energy scalable femtosecond source tunable from 1.3 to 1.7 $\mu$m Optics express 25(14), 15760 - 15774 (2017) [10.1364/OE.25.015760]   We demonstrate that energetic femtosecond pulses tunable from 1.3 to 1.7 µm can be achieved using self-phase modulation enabled spectral broadening followed by spectral lobe filtering. Based on a home-built 5-W Er-fiber laser system operating at 31-MHz repetition rate, we obtain femtosecond pulses that can be continuously tuned from 1.3 to 1.7 µm with >4.5 nJ pulse energy. [...] External links: Restricted; Restricted; Restricted; Restricted; Restricted; Restricted; Restricted; Restricted; Restricted; Restricted; Restricted; Restricted 2017-05-2310:15 [PUBDB-2017-03398] Journal Article et al Split-and-delay Unit for FEL Interferometry in the XUV Spectral Range Applied Sciences 7(6), 544 (2017) [10.3390/app7060544]   In this work we present a reflective split-and-delay unit (SDU) developed for interferometric time-resolved experiments utilizing an (extreme ultraviolet) XUV pump–XUV probe scheme with focused free-electron laser beams. The developed SDU overcomes limitations for phase-resolved measurements inherent to conventional two-element split mirrors by a special design using two reflective lamellar gratings. [...] External links: OpenAccess; OpenAccess; OpenAccess; OpenAccess; OpenAccess; OpenAccess 2017-05-2214:41 [PUBDB-2017-03368] Journal Article et al Probing Dynamics in Colloidal crystals with pump-probe experiments at LCLS Methodololgy and analysis Seminar, Meeting locationHamburg, Germany, Applied Sciences 7(5), 519 (2017) [10.3390/app7050519]   We present results of the studies of dynamics in colloidal crystals performed by pump-probeexperiments using an X-ray free-electron laser (XFEL). Colloidal crystals were pumped with aninfrared laser at a wavelength of 800 nm with varying power and probed by XFEL pulses at anenergy of 8 keV with a time delay up to 1000 ps. [...] External links: Fulltext; OpenAccess; OpenAccess; OpenAccess; OpenAccess; OpenAccess; OpenAccess 2017-05-1911:38 [PUBDB-2017-03217] Journal Article et al Breaking the Femtosecond Barrier in Multi-km Timing Synchronization Systems   To observe electronic dynamics in atoms, molecules, and condensed matter taking place on an attosecond time scale, next-generation photon science facilities like X-ray free-electronlasers and intense laser beamlines require system-wide attosecondlevel synchronization of dozens of optical andmicrowave signals up to kilometer distances. Here, we present for the first time a timing synchronization system that can meet the strict timing requirements of such large-scale facilities. [...] External links: OpenAccess; OpenAccess; OpenAccess; OpenAccess; OpenAccess; OpenAccess 2017-05-1711:16 [PUBDB-2017-03059] Journal Article et al Narrowband terahertz generation wich chirped-and-delayed laser pulses in periodically poled lithium niobate Optics letters 42(11), 2118 - 2121 (2017) [10.1364/OL.42.002118]   We generate narrowband terahertz (THz) radiation in periodically poled lithium niobate (PPLN) crystals using two chirped-and-delayed driver pulses from a high-energy Ti:sapphire laser. The generated frequency is determined by the phase-matching condition in the PPLN and influences the temporal delay of the two pulses for efficient terahertz generation. [...] External links: Restricted; Restricted; Restricted; Restricted; Restricted; Restricted 2017-05-1211:45 [PUBDB-2017-02744] Journal Article et al Attosecond Interferometry with Self-Amplified Spontaneous Emission of a free-electron laser Nature Communications 8, 15626 (2017) [10.1038/ncomms15626]   Light-phase-sensitive techniques, such as coherent multidimensional spectroscopy, are well-established in a broad spectral range, already spanning from radio-frequencies in nuclear magnetic resonance spectroscopy to visible and ultraviolet wavelengths in nonlinear optics with table-top lasers. In these cases, the ability to tailor the phases of electromagnetic waves with high precision is essential [...] External links: OpenAccess; OpenAccess; OpenAccess; OpenAccess; OpenAccess; OpenAccess 2017-05-0813:15 [PUBDB-2017-02387] Journal Article et al Lepton-Flavor-Dependent Angular Analysis of $B \to K^{*}\ell^{+}\ell^{-}$ Physical review letters 118(11), 111801 (2017) [10.1103/PhysRevLett.118.111801]   We present a measurement of angular observables and a test of lepton flavor universality in the $B→K∗ℓ^{+}ℓ^{−}$ decay, where ℓ is either e or μ. The analysis is performed on a data sample corresponding to an integrated luminosity of 711  fb$^{−1}$ containing 772×10$^6$ $B\bar{B}$ pairs, collected at the $\Upsilon$(4S) resonance with the Belle detector at the asymmetric-energy $e^{+}e^−$ collider KEKB. [...] External links: Fulltext; OpenAccess; OpenAccess; OpenAccess; OpenAccess; OpenAccess 2017-05-0322:30 [PUBDB-2017-02205] Journal Article et al Highly efficient soft X-ray spectrometer based on a reflection zone plate for resonant inelastic X-ray scattering measurements Optics express 25(10), 10984 - 10996 (2017) [10.1364/OE.25.010984]   We present a newly designed compact and flexible soft X-ray spectrometer for resonant inelastic X-ray scattering (RIXS) studies within an energy range from 380 eV to 410 eV, which would include the K alpha emission lines of vital elements like nitrogen. We utilized an off-axis reflection zone plate (RZP) as the wavelength selective element with a maximum line density of 10000 l/mm [...] External links: OpenAccess; OpenAccess; OpenAccess; OpenAccess; OpenAccess 2017-04-2109:21 [PUBDB-2017-01762] Journal Article et al Multiple Auger cycle photoionisation of manganese atoms by short soft x-ray pulses New journal of physics 19(4), 043002 (2017) [10.1088/1367-2630/aa660a]   The multiple ionisation of atomic Mn, excited at (photon energy: 52.1eV) and above (photon energy: 61.1eV) the discrete giant 3p–3d resonance, was studied using high irradiation free-electron-laser soft x-ray pulses from the BL2 beamline of FLASH, DESY, Hamburg. In particular, the impact of the giant resonance on the ionisation mechanism was investigated. [...] External links: Fulltext; OpenAccess 2017-04-1910:18 [PUBDB-2017-01684] Journal Article et al Structure Studies of the Bond-Orientational order and the hexatic-smectic transition in liquid crystals of various compositions Soft matter 13(17), 3240 - 3252 (2017) [10.1039/C7SM00343A]   We report on the X-ray studies of freely suspended hexatic films of three different liquid crystal compounds. By applying angular X-ray cross-correlation analysis (XCCA) to the measured diffraction patterns the parameters of the bond-orientational (BO) order in the hexatic phase were directly determined [...]