# CFEL-UFOX

 2018-03-1514:54 [PUBDB-2018-01486] Journal Article et al Femtosecond 85  μm source based on intrapulse difference-frequency generation of 21  μm pulses Optics letters 43(6), 1335 - 1338 (2018) [10.1364/OL.43.001335]   We report on a femtosecond ∼8.5  μm, ∼2  μJ source based on the intrapulse difference-frequency generation (DFG) of 2.1 μm pulses in an AgGaSe2 (AGSe) crystal. Compared to the conventional ∼0.8 or 1 μm near-infrared (IR) pulses, a ∼2  μm driver for intrapulse DFG can provide more efficient conversion into the wavelengths longer than 5 μm due to a lower quantum defect and is more suitable for the non-oxide nonlinear crystals that have a relatively low bandgap energy. [...] Restricted: PDF PDF (PDFA); 2018-03-0512:58 [PUBDB-2018-01375] Journal Article et al Near- and Extended-Edge X-Ray-Absorption Fine-Structure Spectroscopy Using Ultrafast Coherent High-Order Harmonic Supercontinua Physical review letters 120(9), 093002 (2018) [10.1103/PhysRevLett.120.093002]   Recent advances in high-order harmonic generation have made it possible to use a tabletop-scale setup to produce spatially and temporally coherent beams of light with bandwidth spanning 12 octaves, from the ultraviolet up to x-ray photon energies >1.6 keV. Here we demonstrate the use of this light for x-ray-absorption spectroscopy at the K- and L-absorption edges of solids at photon energies near 1 keV. [...] OpenAccess: PDF PDF (PDFA); 2018-03-0211:38 [PUBDB-2018-01356] Journal Article et al Pre-chirp managed, core-pumped nonlinear PM fiber amplifier delivering sub-100-fs and high energy (10 nJ) pulses with low noise Optics express 26(5), 6427 - 6438 (2018) [10.1364/OE.26.006427]   We demonstrate a pre-chirp managed amplification (PCMA) system that is based on two stages of core-pumped, polarization maintaining (PM) fiber amplifiers. It produces output pulses with <65 fs duration and >10 nJ pulse energy from single-mode fibers. [...] OpenAccess: PDF PDF (PDFA); 2018-02-2715:48 [PUBDB-2018-01330] Journal Article et al Comparative Spectroscopic Investigation of $\mathrm Tm^{3+}$: Tellurite Glasses for 2-$\mu$m Lasing Applications Applied Sciences 8(3), 333 (2018) [10.3390/app8030333] special issue: "Rare-Earth Doping for Optical Applications"   We performed a comparative spectroscopic analysis on three novel $\mathrm Tm^{3+}$:tellurite-based glasses with the following compositions $\mathrm {Tm^{3+}Tm_2O_3:TeO_2-ZnO}$ (TeZnTm), $\mathrm{Tm_2O_3:TeO_2-Nb_2O_5 (TeNbTm)}$, and $\mathrm{Tm^{3+}:TeO_2-K_2O-Nb_2O_5}$ (TeNbKTm), primarily for 2-m laser applications. Tellurite glasses were prepared at different doping concentrations in order to investigate the effect of $\mathrm{Tm^{3+}}$ ion concentration as well as host composition on the stimulated emission cross sections and the luminescence quantum efficiencies [...] OpenAccess: Comparative - PDF PDF (PDFA); applsci-08-00333 - PDF PDF (PDFA); 2018-02-0615:20 [PUBDB-2018-01078] Conference Presentation (Invited) et al Frequency-shifted sources for Terahertz-driven linear electron acceleration SPIE Photonics West 2018, Meeting locationSan Francisco, CA, USA, 27 Jan 2018 - 1 Feb 2018   The generation of THz-frequency radiation via nonlinear parametric frequency down-conversion has long been driven by the spectroscopy and imaging communities. As a result, little efforts have been undertaken toward the generation of high energy THz-frequency pulses. [...] OpenAccess: PDF PDF (PDFA); 2018-02-0514:49 [PUBDB-2018-01055] Dissertation / PhD Thesis Ippen, E. P. High field terathertz radiation : Conduits to synchronized hyper spectral systems 267 pp. (2018) = Dissertation, Massachusetts Institute of Technology, 2018 Laser technology has seen significant development since its inception in 1960. After the first experiments of nonlinear phenomena in optics, the development of the mode-locked laser has led to rapid proliferation of the study of nonlinear frequency conversion techniques-enabling the conversion of light from the infra-red, all the way to the soft X-Ray region. [...] 2018-02-0109:43 [PUBDB-2018-00946] Journal Article/Contribution to a conference proceedings et al Status and Objectives of the Dedicated Accelerator R&D Facility “SINBAD” at DESY 3rd European Advanced Accelerator Concepts Workshop, EAAC 2017, Meeting locationElba, Italy, 24 Sep 2017 - 29 Sep 2017 Nuclear instruments & methods in physics research / A S0168900218300536 (2018) [10.1016/j.nima.2018.01.036]   We present a status update on the dedicated R&D facility SINBAD which is currently under construction at DESY. The facility will host multiple independent experiments on the acceleration of ultra-short electron bunches and novel, high gradient acceleration methods. [...] Restricted: PDF PDF (PDFA); 2018-01-2911:44 [PUBDB-2018-00894] Contribution to a conference proceedings/Contribution to a book et al A CEP-stable, femtosecond 8.5 μm source based on intrapulse DFG of 2.1 μm pulses 2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) : [Proceedings] - IEEE, 2017. - ISBN 978-1-5090-6736-7 - doi:10.1109/CLEOE-EQEC.2017.8086730Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference, CLEO/Europe-EQEC, Meeting locationMünchen, Germany, 25 Jun 2017 - 29 Jun 2017 Washington, D.C., USA : IEEE, 1 pp. (2017) [http://dx.doi.org/10.1109/CLEOE-EQEC.2017.8086730]   Few-cycle carrier-envelope phase (CEP) stable laser pulses enable the precise control of strong-field electron dynamics, such as high-harmonic generation in gases and solids or electron emission in nano-structures [1]. The intrapulse difference-frequency generation (DFG) pumped by a broadband pulse is a reliable method of producing passively CEP-stable pulses. [...] Restricted: PDF PDF (PDFA); 2018-01-2315:30 [PUBDB-2018-00770] Journal Article et al Octave-spanning coherent supercontinuum generation in silicon on insulator from 1.06 μm to beyond 2.4 μm Light 7(1), 17131 (2018) [10.1038/lsa.2017.131]   Efficient complementary-metal-oxide-semiconductor-based nonlinear optical devices in the near infrared are in strong demand. Due to two-photon absorption in silicon, however, much nonlinear research is shifting towards unconventional photonics platforms. [...] OpenAccess: lsa2017131 - PDF PDF (PDFA); AAP-lsa2017131 - PDF PDF (PDFA); 2018-01-2314:14 [PUBDB-2018-00768] Preprint/Report et al An Adiabatic Phase-Matching Accelerator [arXiv:1712.08403; FERMILAB-PUB-17-610-APC]   We present a general concept to accelerate non-relativistic charged particles. Our concept employs an adiabatically-tapered dielectric-lined waveguide which supports accelerating phase velocities for synchronous acceleration. [...] OpenAccess: PDF PDF (PDFA);