CFEL-UFOX

Latest additions:
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. [...]
OpenAccess: desy-thesis-19-021.title - Download fulltextPDF Download fulltextPDF (PDFA); PhD_thesis_GMR_Published - Download fulltextPDF Download fulltextPDF (PDFA);

Detailed record - Similar records
2019-08-29
09:39
OpenAccess [PUBDB-2019-03141] Journal Article

Selective etching of fs-laser inscribed high aspect ratio microstructures in YAG
We report on a systematic investigation of selective etching of fs-laser inscribedmicrostructures in Y3Al5O12 (YAG). The resulting microchannels are up to 8.9mm long andexhibit cross sections from below 10 μm to more than 100 μm. [...]
OpenAccess: Download fulltextPDF Download fulltextPDF (PDFA);
ddc:620
Detailed record - Similar records
2019-08-01
14:39
OpenAccess [PUBDB-2019-02888] Book/Report/Dissertation / PhD Thesis

Sub-Cycle Light Field Synthesizer for Attosecond Science
[DESY-THESIS-2019-016]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 190 pp. () [10.3204/PUBDB-2019-02888] = Dissertation, Universität Hamburg, 2019  GO
The generation of energetic laser pulses with durations below one optical cycle is one of the current frontiers of ultrafast optics. Such sources attract enormous attention due to the implications they hold for studying extreme light-matter interactions and to harness attosecond pulse production via high harmonic generation (HHG). [...]
OpenAccess: desy-thesis-19-016.title - Download fulltextPDF Download fulltextPDF (PDFA); PhD Thesis Volltext - Download fulltextPDF Download fulltextPDF (PDFA);

Detailed record - Similar records
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

Detailed record - Similar records
2019-07-12
10:46
DBCoverage [PUBDB-2019-02699] Journal Article

Temperature dependence of Alexandrite effective emission cross section and small signal gain over the 25-450 °C range
We present detailed measurements of effective emission cross section spectra of theAlexandrite gain medium in the 25-450 °C temperature range and provide analytic formulasthat can be used to match the measured spectra. The measurement results have been used toinvestigate the wavelength and temperature dependence of small signal gain, as well as gainbandwidth relevant for ultrafast pulse generation/amplification. [...]
Restricted: Download fulltextPDF Download fulltextPDF (PDFA);
ddc:620
Detailed record - Similar records
2019-06-24
13:50
OpenAccess [PUBDB-2019-02569] Journal Article
et al
Femtosecond phase control in high-field terahertz-driven ultrafast electron sources
Optica 6(7), 872-877 () [10.1364/OPTICA.6.000872]  GO
Terahertz-based electron acceleration has recently emerged as a promising candidate for driving next-generation high-brightness electron sources. Although initial demonstrations have proven the feasibility of this technology for accelerating and manipulating the phase space of electrons, further demonstrations of exquisite timing control are required to make use of terahertz acceleration for demanding applications such as light sources and ultrafast electron diffraction. [...]
OpenAccess: Download fulltextPDF Download fulltextPDF (PDFA); External link: Download fulltextFulltext
ddc:620
Detailed record - Similar records
2019-06-11
09:30
OpenAccess [PUBDB-2019-02444] Journal Article

Terahertz-induced cascaded interactions between spectra offset by large frequencies
Optics express 27(14), 19254-19269 () [10.3204/PUBDB-2019-02444]  GO
We explore the dynamics of a system where input spectra in the optical domain with very disparate center frequencies are strongly coupled via highly phase-matched, cascaded second-order nonlinear processes driven by terahertz radiation. The only requirement is that one of the input spectra contain sufficient bandwidth to generate the phase-matched terahertz frequency driver. [...]
OpenAccess: Download fulltextPDF Download fulltextPDF (PDFA); External link: Download fulltextFulltext
ddc:530
Detailed record - Similar records
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. [...]
External link: Download fulltextFulltext

Detailed record - Similar records
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 [...]
OpenAccess: Download fulltextPDF Download fulltextPDF (PDFA);
ddc:530
Detailed record - Similar records
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. [...]
OpenAccess: Download fulltextPDF Download fulltextPDF (PDFA);
ddc:530
Detailed record - Similar records