CFEL-UFOX

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2019-09-16
14:35
OpenAccess [PUBDB-2019-03351] Book/Report/Dissertation / PhD Thesis

Parametric Waveform Synthesis
[DESY-THESIS-2019-021]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 172 pp. () [10.3204/PUBDB-2019-03351] = Dissertation, Universität Hamburg, 2019  GO
The coherent synthesis of pulses from Optical Parametric Amplifiers (OPAs) offers the possibility to realize field-controlled electromagnetic waveforms with sub-cycle durations, widely scalable in energy and spectral bandwidth.Here we demonstrate a fully functional prototype of a mJ-level two channel parametric waveform synthesizer, which is ready to be upgraded to three channels. The synthesized field, whose bandwidth covers more than 2 octaves, from ~500 nm to ~2200 nm, can be compressed to a non-sinusoidal sub-cycle waveform close to the transform-limit.The long term stable operation of such a complex laser source is achieved, for the first time, by means of a sophisticated optical and mechanical design of the whole OPA system, along with targeted improvements made to the commercial pump laser.A new seeding scheme based on multiple supercontinua, further scalable to the mid-IR, leads to excellent phase stability among the different OPA channels and to a simplified dispersion management scheme.A detailed study, both theoretical and experimental, of the couplings among different pulse parameters during the parametric amplification, unveiled novel details of the Carrier-Envelope-Phase (CEP) stabilization process via OPA, and guided the design of the CEP-controlled seeding front-end.A simplified two-dimensional spectral shearing interferometry setup, where the ancillary pulses are obtained by spectral filtering the pump pulses, has been developed to easily characterize the spectral phase of the ultrabroadband pulses from each channel, overcoming the limitation of second-harmonic-based methods.Furthermore, ad-hoc nonlinear optical techniques have been deployed to observe the most relevant synthesis parameters such as the CEP of the seeding pulses and the relative phase among the different channels outputs. [...]
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2019-07-16
13:17
[PUBDB-2019-02729] Conference Presentation
et al
Temporal coherence of linearly and circularly polarized high-harmonics from silicon
CLEO: QELS_Fundamental Science, San JoseSan Jose, California, 6 May 2019 - 10 May 20192019-05-062019-05-10

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2019-05-14
14:03
[PUBDB-2019-02269] Lecture
et al
CFEL Molecular and Ultrafast Science Seminar (MUSS)
Lecture at Universität Hamburg (), 15 Oct 2018 - 2 Feb 20192018-10-152019-02-02
CFEL Molecular and Ultrafast Science Seminar (MUSS) series. This is a general topical seminar series on developments in modern molecular physics 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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2019-05-06
14:55
OpenAccess [PUBDB-2019-02157] Journal Article

Analysis of terahertz generation using tilted pulse fronts
Optics express 27(3), 3496 - 3517 () [10.1364/OE.27.003496]  GO
A spatio-temporal analysis of terahertz generation by optical rectification of tilted pulse fronts is presented. Closed-form expressions of terahertz transients and spectra in two spatial dimensions are furnished in the undepleted limit [...]
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2019-04-04
14:46
OpenAccess [PUBDB-2019-01868] Journal Article
et al
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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2019-01-28
15:22
OpenAccess [PUBDB-2019-00823] Journal Article
et al
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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2018-12-21
07:57
OpenAccess [PUBDB-2018-05840] Conference Presentation
et al
Polarization states of high-harmonics generated in silicon from elliptical drivers
Ultrafast Phenomena, UP 2018, HamburgHamburg, Germany, 15 Jul 2018 - 20 Jul 20182018-07-152018-07-20  GO
The polarization states of high-harmonics generated in silicon with elliptical excitation is studied. Circularly polarized harmonics are demonstrated with both circular and non-circularexcitation, determined by crystal symmetry and dynamical response of the system..
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2018-12-14
17:13
OpenAccess [PUBDB-2018-05531] Conference Presentation
et al
Half-cycle mJ-level CEP-stable Pulses fromParametricWaveform Synthesis
CLEO Pacific Rim, CLEO-PR, Hong KongHong Kong, China, 29 Jul 2018 - 3 Aug 20182018-07-292018-08-03  GO
Nearly transform-limited, carrier-envelope phase stable, 3.4 fs pulses with centralwavelength of 1.8 mm are generated via parametric waveform synthesis. The mJ-level energy,at 1 kHz repetition rate, allows for waveform-controlled bright high-harmonic generation..
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2018-12-14
17:10
OpenAccess [PUBDB-2018-05530] Conference Presentation
et al
Controlled HHG with a Sub-Cycle mJ-Level Parametric Waveform Synthesizer
CLEO Pacific Rim, CLEO-PR, Hong KongHong Kong, China, 29 Jul 2018 - 3 Aug 20182018-07-292018-08-03  GO
We present high-harmonic generation (HHG) driven with a sub-cycle mJ-levelparametric waveform synthesizer. The HHG yield and spectral shape can be controlled byvarying the carrier-envelope phase and the relative phase in the synthesizer channels..
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2018-12-14
17:05
OpenAccess [PUBDB-2018-05529] Conference Presentation
et al
Two-color-field Driven Hollow-core Fiber Compressor with Robust Inline Scheme
CLEO Pacific Rim, CLEO-PR, Hong KongHong Kong, China, 29 Jul 2018 - 3 Aug 20182018-07-292018-08-03  GO
We present a new scheme of two-color-field driven hollow-core-fiber compression,whose ~1mJ output covers 300 nm to 950 nm supporting sub-cycle pulses of ~2.1 fs duration.The spectral phase is characterized with two-dimensional spectral shearing interferometry..
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