CFEL-UFOX

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2018-11-08
13:53
[PUBDB-2018-04340] Contribution to a conference proceedings/Contribution to a book
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One Joule 500 Hz cryogenic Yb:YAG Laser Driver
Laser Congress 2018 (ASSL) : [Proceedings] - OSA Washington, D.C., 2018. - ISBN 978-1-943580-48-4 - doi:10.1364/ASSL.2018.ATu6A.1
Advanced Solid State Lasers, ASSL, Boston, MABoston, MA, USA, 4 Nov 2018 - 8 Nov 20182018-11-042018-11-08
Washington, D.C., USA : OSA 2 pp. () [10.1364/ASSL.2018.ATu6A.1]  GO
A cryogenic Yb:YAG composite-thin-disk amplifier produced one-joule diffraction limited pulses at 200 Hz and 50% optical-to-optical efficiency. As of this writing 20 hours in operation have been compiled recording $< 0.5%$-power and $< 30 µrad$ pointing stability..
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2018-11-08
13:47
[PUBDB-2018-04339] Contribution to a conference proceedings/Contribution to a book
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Novel fiber-based ultrafast platform for multimodal optical virtual skin biopsy
Laser Congress 2018 (ASSL) : [Proceedings] - OSA, Washington, D.C., 2018. - ISBN 978-1-943580-48-4 - doi:10.1364/ASSL.2018.ATh5A.2
Advanced Solid State Lasers, ASSL, Boston, MABoston, MA, USA, 4 Nov 2018 - 8 Nov 20182018-11-042018-11-08
Washington, D.C. : OSA ATh5A.2 () [10.1364/ASSL.2018.ATh5A.2]  GO
We demonstrate a fiber-based ultrafast platform generating energetic femtosecond pulses at 1250 nm and 775 nm simultaneously, which enables label-free second-harmonic generation, third-harmonic generation, and two-photon excitation fluorescence imaging in human skin..
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2018-11-07
12:29
[PUBDB-2018-04259] Contribution to a conference proceedings/Contribution to a book
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Demonstration of 0.6 mJ Multicycle THz Pulses Via Chirp-and-delay Down Conversion of Broadband Lasers with Precise Spectral Phase Tuning and Large PPLN
43rd International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2018, NagoyaNagoya, Japan, 9 Sep 2018 - 14 Sep 20182018-09-092018-09-14 IEEE 1 pp. () [10.1109/IRMMW-THz.2018.8509911] special issue: "IEEE Xplore"  GO
Millijoule-scale multicycle terahertz (THz) sources have recently gained interest for applications where high-peak-fields and narrow bandwidths can produce unique results, such as linear and nonlinear spectroscopy [1], control of matter [2], and compact electron acceleration [3]. Difference frequency generation (DFG) using periodically-poled lithium niobate (PPLN) is a very promising method for producing such pulses, due to the high nonlinear coefficient of lithium niobate and the tunability of the periodic poling. [...]
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2018-11-05
14:21
[PUBDB-2018-04149] Contribution to a conference proceedings/Contribution to a book
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Compact THz Accelerators: From Fiction to Reality
43rd International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2018, NagoyaNagoya, Japan, 9 Sep 2018 - 14 Sep 20182018-09-092018-09-14 IEEE 1-3 () [10.1109/IRMMW-THz.2018.8510463]  GO
The use of THz radiation for electron acceleration and manipulation of electron bunches has progressed over the last decade to a level where practical implementations of THz-powered photoguns, LINACs and a wide range of beam manipulators have become possible. Here, we present a segmented terahertz electron accelerator and manipulator (STEAM) capable of performing multiple high-field operations on the 6D -phase-space of ultrashort electron bunches. [...]
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2018-11-05
13:04
OpenAccess [PUBDB-2018-04142] Book/Report/Dissertation / PhD Thesis
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Velocity-Map Imaging for Emittance Characterization of Field Emitter Arrays
[DESY-THESIS-2018-033]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 110 pp. () [10.3204/PUBDB-2018-04142] = Dissertation, Universität Hamburg, 2018  GO
Electron beams of high quality, e.g., low emittance, are of crucial importance for cutting-edge scientific instruments, such as x-ray free electron lasers (XFELs) and ultrafast electron diffraction (UED) setups. A velocity-map-imaging spectrometer is demonstrated to characterize the normalized transverse emittance of photoemitted electron bunches. [...]
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2018-10-29
14:06
OpenAccess [PUBDB-2018-03999] Journal Article
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High efficiency terahertz generation in a multi-stage system
Optics express 26(23), 29744 - 29768 () [10.1364/OE.26.029744]  GO
We describe a robust system for laser-driven narrowband terahertz generation with high conversion efficiency in periodically poled Lithium Niobate (PPLN). In the multi-stage terahertz generation system, the pump pulse is recycled after each PPLN stage for further terahertz generation. [...]
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2018-10-04
14:57
OpenAccess [PUBDB-2018-03712] Conference Presentation (Invited)

High-energy THz pulses for electron acceleration
2018 IEEE Photonics Conference, IPC, Reston, VirginiaReston, Virginia, USA, 30 Sep 2018 - 4 Oct 20182018-09-302018-10-04  GO
Recent theoretical and experimental results on laser based high-energy single-cycle and multi-cycle terahertz pulse generation are discussed. The pulse formats are chosen to demonstrate various THz accelerating and beam manipulation devices. [...]
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2018-09-25
14:17
OpenAccess [PUBDB-2018-03581] Conference Presentation
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Influence of Pump Laser Phase and Amplitude Distortions on Terahertz Generation Efficiency
43rd International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2018, NagoyaNagoya, Japan, 9 Sep 2018 - 14 Sep 20182018-09-092018-09-14  GO
We analyze the impact of phase front and intensity profile distortions of the pump laser on the generation of narrowband terahertz radiation by difference frequency generation inperiodically poled Lithium Niobate (PPLN). A code employing finite difference method for beam propagation and nonlinear interaction in cylindrical symmetric system is developed. [...]
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2018-09-25
14:07
OpenAccess [PUBDB-2018-03580] Conference Presentation
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Multi-mJ terahertz generation in periodically poled Lithium-Niobate by pulse recycling with dispersion compensation
XXI International Conference on Ultrafast Phenomena, UP 2018, HamburgHamburg, Germany, 15 Jul 2018 - 20 Jul 20182018-07-152018-07-20  GO
We propose a design for high efficiency narrow-band terahertz generation using multiple stages with dispersion compensation. Terahertz efficiency of a few percent could be achieved..
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2018-09-25
13:49
OpenAccess [PUBDB-2018-03579] Conference Presentation
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High Efficiency Terahertz Generation in PPLN by Pulse Recycling with Quartz Out-coupler
Pacific Rim Conference on Lasers and Electro-Optics, CLEO Pacific Rim 2018, HongkongHongkong, China, 29 Jul 2018 - 3 Aug 20182018-07-292018-08-03  GO
Multi-cycle terahertz generation using two consecutive PPLN crystals with quartz coupler is proposed. Our simulation suggests that pump pulse recycling with dispersioncompensation can lead to higher terahertz conversion efficiency..
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