# FS-LA

 2018-02-1312:04 [PUBDB-2018-01169] Conference Presentation Oliveira, S. d. Intensity noise in mid-IR frequency combs based on difference frequency generation CLEO Europe 2017, Meeting locationMunich, Germany, 25 Jun 2017 - 29 Jun 2017 2018-02-0112:06 [PUBDB-2018-00971] Conference Presentation et al Widely Tunable Mid-IR, High Signal-to-Noise Frequency Comb based Fourier Transform Spectrometer CLEO: Science and Innovations, Meeting locationSan Jose, California, 14 May 2017 - 19 May 2017   We present an optical frequency comb based Fourier Transform Spectrometer, covering 3.0 to 5.2 μm with 2 m optical path delay and a signal-to-noise ratio of 800 in 40 s acquisition time at 4.6 μm.. 2018-01-1210:54 [PUBDB-2018-00600] Journal Article et al Intensity noise coupling in soliton fiber oscillators Optics letters 42(24), 5266 - 5269 (2017) [10.1364/OL.42.005266]   We present an experimental and numerical study on the spectrally resolved pump-to-output intensity noise coupling in soliton fiber oscillators. In our study, we observe a strong pump noise coupling to the Kelly sidebands, while the coupling to the soliton pulse is damped. [...] Restricted: PDF PDF (PDFA); 2018-01-1116:59 [PUBDB-2018-00565] Journal Article et al Optical gating and streaking of free electrons with sub-optical cycle precision Nature Communications 8, 14342 (2017) [10.1038/ncomms14342]   The temporal resolution of ultrafast electron diffraction and microscopy experiments is currently limited by the available experimental techniques for the generation and characterization of electron bunches with single femtosecond or attosecond durations. Here, we present proof of principle experiments of an optical gating concept for free electrons via direct time-domain visualization of the sub-optical cycle energy and transverse momentum structure imprinted on the electron beam [...] OpenAccess: PDF PDF (PDFA); 2018-01-1114:07 [PUBDB-2018-00503] Journal Article et al Generation of three-dimensional versatile vortex linear light bullets (Invited Paper) Chinese optics letters 15(3), 030009 - (2017) [10.3788/COL201715.030009]   We generate and measure the versatile vortex linear light bullet, which combines a high-order Bessel beam and an Airy pulse. This three-dimensional optical wave packet propagates without distortion in any medium, while carrying an orbital angular momentum. [...] OpenAccess: PDF PDF (PDFA); 2018-01-1113:43 [PUBDB-2018-00492] Journal Article et al Monolithic optofluidic mode coupler for broadband thermo- and piezo-optical characterization of liquids Optics express 25(19), 22932-22946 (2017) [10.1364/OE.25.022932]   We present a monolithic fiber device that enables investigation of the thermo- and piezo-optical properties of liquids using straightforward broadband transmission measurements. The device is a directional mode coupler consisting of a multi-mode liquid core and a single-mode glass core with pronounced coupling resonances whose wavelength strongly depend on the operation temperature. [...] OpenAccess: PDF PDF (PDFA); 2018-01-1113:31 [PUBDB-2018-00487] Journal Article et al Acceleration of sub-relativistic electrons with an evanescent optical wave at a planar interface Optics express 25(16), 19195 - 19204 (2017) [10.1364/OE.25.019195]   We report on a theoretical and experimental study of the energy transfer between an optical evanescent wave, propagating in vacuum along the planar boundary of a dielectric material, and a beam of sub-relativistic electrons. The evanescent wave is excited via total internal reflection in the dielectric by an infrared $(λ = 2 μm)$ femtosecond laser pulse. [...] OpenAccess: PDF PDF (PDFA); 2017-12-1722:45 [PUBDB-2017-13571] Contribution to a conference proceedings/Contribution to a book et al Concept for a Seeded FEL at FLASH2 38th Intl. Free-Electron Laser Conference, FEL2017, Meeting locationSanta Fe, New Mexico, USA, 20 Aug 2017 - 25 Aug 2017 JACoW, 4 pp. (2017) [10.3204/PUBDB-2017-13571]   The free-elec­tron laser (FEL) FLASH is a user fa­cil­ity de­liv­er­ing pho­ton pulses down to 4 nm wave­length. Re­cently, the sec­ond FEL un­du­la­tor beam­line 'FLASH2' was added to the fa­cil­ity. [...] OpenAccess: PDF PDF (PDFA); 2017-12-0714:54 [PUBDB-2017-12900] Journal Article et al Direct Measurement of the Pulse Duration and Frequency Chirp of Seeded XUV Free Electron Laser Pulses New journal of physics 20, 013010 (2017) [10.1088/1367-2630/aa9b4c]   We report on a direct time-domain measurement of the temporal properties of a seeded free-electron laser pulse in the extreme ultraviolet spectral range. Utilizing the oscillating electromagnetic field of terahertz radiation, a single-shot THz streak-camera was applied for measuring the duration as well as spectral phase of the generated intense XUV pulses. [...] OpenAccess: PDF PDF (PDFA); External link: Fulltext 2017-12-0713:58 [PUBDB-2017-12869] Contribution to a conference proceedings/Contribution to a book et al Experience in Operating sFLASH With High-Gain Harmonic Generation 8th International Particle Accelerator Conference, IPAC17, Meeting locationKopenhagen, Denmark, 15 May 2017 - 19 May 2017 Geneva : JACoW, 2596-2599 (2017) [10.18429/JACoW-IPAC2017-WEPAB016]   sFLASH, the experimental setup for external seeding of free-electron lasers (FEL) at FLASH, has been operated in the high-gain harmonic generation (HGHG) mode. A detailed characterization of the laser-induced energy modulation, as well as the temporal characterization of the seeded FEL pulses is possible by using a transverse deflecting structure and an electron spectrometer. [...] OpenAccess: PDF PDF (PDFA); External link: Fulltext