FS-CFEL-2

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2019-05-14
14:52
[PUBDB-2019-02274] Lecture
et al
Molecular and Ultrafast Science Seminar (MUSS)
Lecture at Universität Hamburg (Hamburg, Germany), 1 Apr 2019 - 13 Jul 20192019-04-012019-07-13
CFEL Molecular and Ultrafast Science Seminar (MUSS) series. This is a general topical seminar series on developments in modern molecular and ultrafast science jointly organized by the CFEL Controlled Molecule Imaging group, the Spectroscopy of molecular processes group, the CFEL Attosecond Science group, and the CFEL Ultrafast Optics group. [...]
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2019-04-04
14:46
OpenAccess [PUBDB-2019-01868] Journal Article
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Frequency-comb-based laser system producing stable optical beat pulses with picosecond durations suitable for high-precision multi-cycle terahertz-wave generation and rapid detection
Optics express 27(8), 11037 - 11056 () [10.1364/OE.27.011037]  GO
We generate temporally modulated optical pulses with a beat frequency of 255 GHz, a duration of 360 ps, and a repetition rate of 2 MHz. The temporal envelope, beat frequency, and repetition rate are computer-programmable. [...]
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2019-03-06
13:47
OpenAccess [PUBDB-2019-01359] Journal Article
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Polarization-state-resolved high-harmonic spectroscopy of solids
Attosecond metrology sensitive to sub-optical-cycle electronic and structural dynamics is opening up new avenues for ultrafast spectroscopy of condensed matter. Using intense lightwaves to precisely control the fast carrier dynamics in crystals holds great promise for next-generation petahertz electronics and devices. [...]
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2019-02-14
14:44
OpenAccess [PUBDB-2019-01109] Journal Article

Simultaneous generation and compression of broadband terahertz pulses in aperiodically poled crystals
Optics express 27(5), 6580 - 6597 () [10.1364/OE.27.006580]  GO
We introduce a technique to generate compressed broadband terahertz pulses based on cascaded difference-frequency generation. The approach employs a non-uniform sequence of pump pulses in aperiodically poled crystals [...]
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2019-01-31
13:20
OpenAccess [PUBDB-2019-00882] Journal Article
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Integrated CMOS-compatible Q-switched mode-locked lasers at 1900nm with an on-chip artificial saturable absorber
Optics express 27(3), 3542 - 3556 () [10.1364/OE.27.003542]  GO
We present a CMOS-compatible, Q-switched mode-locked integrated laser operating at 1.9 µm with a compact footprint of 23.6 × 0.6 × 0.78mm. The Q-switching rate is 720 kHz, the mode-locking rate is 1.2 GHz, and the optical bandwidth is 17nm, which is sufficient to support pulses as short as 215 fs [...]
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2019-01-28
15:22
OpenAccess [PUBDB-2019-00823] Journal Article
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Reconstructing nonlinear plasma wakefields using a generalized temporally encoded spectral shifting analysis
We generalize the temporally encoded spectral shifting (TESS) analysis for measuring plasma wakefields using spectral interferometry to dissimilar probe pulses of arbitrary spectral profile and to measuring nonlinear wakefields. We demonstrate that the Gaussian approximation used up until now results in a substantial miscalculation of the wakefield amplitude, by a factor of up to two [...]
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2019-01-09
11:06
OpenAccess [PUBDB-2019-00167] Journal Article
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Multimodal imaging platform for optical virtual skin biopsy enabled by a fiber-based two-color ultrafast laser source
We demonstrate multimodal label-free nonlinear optical microscopy in human skin enabled by a fiber-based two-color ultrafast source. Energetic femtosecond pulses at 775 nm and 1250 nm are simultaneously generated by an Er-fiber laser source employing frequency doubling and self-phase modulation enabled spectral selection. [...]
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2018-12-30
10:10
[PUBDB-2018-05915] Contribution to a conference proceedings/Contribution to a book
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An intense soft X-ray harmonic super-continuum generated by a three-channel optical waveform synthesizer
[Ebook] Laser Science : part of Frontiers in Optics/Laser Science : 16-20 September 2018, Washington, DC, United States / OSA - The Optical Society , Washington, D.C., USA : OSA - The Optical Society, [2018],
Laser Science 2018, LS 2018, Washington, DCWashington, DC, USA, 16 Sep 2018 - 20 Sep 20182018-09-162018-09-20
Washington, D.C., USA : OSA - The Optical Society, OSA technical digest 2 pp. () [10.1364/LS.2018.LTu5F.2]  GO
We report a soft X-ray super-continuum supporting 200 as isolated attosecond pulses at 60 eV generated using a TW-scale three-channel optical waveform synthesizer. The continuum soft X-ray pulse energy is beyond 0.2 μJ at the exit of the argon gas target..
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2018-12-30
09:46
[PUBDB-2018-05914] Contribution to a conference proceedings/Contribution to a book
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Sub-μJ, 25 eV bandwidth continuum soft X-ray harmonic generated by a TW-scale three-channel waveform synthesizer
[Ebook] IPC 2018 : 31st Annual Conference of the IEEE Photonics Society : 30 September-4 October, Hyatt Regency Reston, Reston, VA, USA / Helmy, Amr , [Piscataway, NJ] : IEEE, 2018,
IEEE Photonics Conference 2018, IPC 2018, Reston, VAReston, VA, USA, 30 Sep 2018 - 4 Oct 20182018-09-302018-10-04
Piscataway, NJ : IEEE 2 pp. () [10.1109/IPCon.2018.8527103]  GO
A 50-mJ three-channel parallel optical waveform synthesizer is demonstrated for generating supercontinuum high-order harmonics in the soft X-ray region. With the full activestabilization of delay jitters, relative phase jitters, and CEPs in the synthesizer, a stable intense continuum harmonic spectrum is obtained around 65 eV with a bandwidth up to 25 eV..
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2018-12-30
09:15
OpenAccess [PUBDB-2018-05913] Journal Article
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Method for direct observation of Bloch oscillations in semiconductors
Optics express 26(18), 23844 - 23853 () [10.1364/OE.26.023844]  GO
We propose a scheme for real-time observations of Bloch oscillations in semiconductors using time-resolved band gap emission spectroscopy. By solving the time-dependent Schrödinger equation, we find one remarkable band gap emission besides the normal high harmonics generated in the interaction of a mid-infrared laser pulse and a semiconductor. [...]
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