A5046901617- Advanced Fiber Laser Technologies
- Laser-Matter Interactions and Applications
- Photonic Crystal and Fiber Optics
- Spectroscopy and Quantum Chemical Studies
- Optical Network Technologies
- Nonlinear Waves and Solitons
- Photonic and Optical Devices
- Nonlinear Photonic Systems
- Ocean Waves and Remote Sensing
- Mass Spectrometry Techniques and Applications
- Semiconductor Lasers and Optical Devices
- Quantum optics and atomic interactions
- Laser Design and Applications
- Terahertz technology and applications
- Advanced Fiber Optic Sensors
- Mechanical and Optical Resonators
- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Tropical and Extratropical Cyclones Research
- Photochemistry and Electron Transfer Studies
- Solid State Laser Technologies
- Chaos control and synchronization
- Complex Systems and Time Series Analysis
- Photorefractive and Nonlinear Optics
- Atomic and Molecular Physics
Weierstrass Institute for Applied Analysis and Stochastics
2011-2020
Forschungsverbund Berlin
2012-2020
Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy
2009-2016
Instituto de Física Teórica
2016
Humboldt-Universität zu Berlin
2012
Humboldt State University
2012
The pioneering paper 'Optical rogue waves' by Solli et al (2007 Nature 450 1054) started the new subfield in optics. This work launched a great deal of activity on this novel subject. As result, initial concept has expanded and been enriched ideas. Various approaches have suggested since then. A fresh look at older results discoveries undertaken, stimulated 'optical waves'. Presently, there may not unique view how scientific term should be used developed. There is nothing surprising when...
The transient appearance of bright spots in the beam profile optical filaments formed xenon is experimentally investigated. Fluence profiles are recorded with high-speed cameras at kilohertz repetition rate laser source. A statistical analysis reveals a thresholdlike heavy-tailed fluence distributions together transition from single to multiple filamentation. multifilament scenario exhibits near-exponential probability density functions, extreme events exceeding significant wave height by...
Saturation of the intensity dependence refractive index is directly computed from ionization rates via a Kramers-Kronig transform. The linear and its dispersion are found to be in excellent agreement with complete quantum mechanical orbital computations. Higher-order terms concur solutions time-dependent Schr\"odinger equation. Expanding formalism all orders up potential atom, we derive model for saturation Kerr effect. This widely confirms recently published controversially discussed...
The concept of rogue waves arises from a mysterious and potentially calamitous phenomenon oceanic surfaces. There is mounting evidence that they are actually commonplace in variety different physical settings. A set defining criteria has been advanced; this great generality therefore applicable to wide class systems. question naturally whether there generic mechanisms responsible for extreme events Here we argue under suitable circumstances nonlinear interaction between weak strong results...
Using experimental data from three different rogue wave supporting systems, determinism, and predictability of the underlying dynamics are evaluated with methods nonlinear time series analysis. We included original records Draupner platform in North Sea as well two optical systems our One latter was measured infrared tail fiber supercontinua, other fluence profiles multifilaments. All sets exhibit extreme-value statistics exceed significant height respective system by a factor larger than 2....
A procedure for computation of the nonlinear refractive index a gaseous medium from intensity dependence ionization rate is reported. The calculated Keldysh theory via Kramers-Kronig transform. Peremolov-Popov-Terent'ev (PPT) analyzed in perturbative limit multiphoton completely analytical expression index. method requires knowledge only particle density and energy gas. Example calculations are performed inert gases compared to experimental data atomic model hyperpolarizability respective...
We demonstrate a novel method for supercontinuum generation in an optical fiber based on two-color pumping with delay and group velocity matching. The scheme relies the enhanced cross-phase-modulation at intensity induced refractive index barrier between dispersive wave soliton. mechanism neither incorporates soliton fission nor modulation instability therefore exhibits extraordinary coherence properties, enabling temporal compression of octave bandwidth into short pulse. Moreover,...
We discuss the influence of higher-order Kerr effect (HOKE) in wide bandgap solids at extreme intensities below onset optically induced damage. Using different theoretical models, we employ multiphoton absorption rates to compute nonlinear refractive index by a Kramers-Kronig transform. Within this framework provide an estimate for appearance significant deviations from standard optical predicting linear change with intensity. role observed saturation behavior practically relevant...
A new scheme for supercontinuum generation covering more than one octave and exhibiting extraordinary high coherence properties has recently been proposed [Phys. Rev. Lett. 110, 233901 (2013)]. The is based on two-pulse collision at a group velocity horizon between dispersive wave soliton. Here we demonstrate that the same can be exploited of supercontinua encompassing entire transparency region fused silica, ranging from 300 to 2300nm. At this bandwidth extension, Raman effect becomes...
As previous theoretical results recently revealed, a Kramers-Kronig transform of multiphoton absorption rates allows for precise prediction on the dispersion nonlinear refractive index ${n}_{2}$ in near infrared. It was shown that this method reproduction recent experimental importance higher-order Kerr effect. Extending these results, current manuscript provides all noble gases excellent agreement with reference data. is furthermore established saturation and inversion highly dispersive...
We reanalyse the probability for formation of extreme waves using simple model linear interference a finite number elementary with fixed amplitude and random phase fluctuations. Under these assumptions no rogue appear when less than 10 interfere each other. Above this threshold wave becomes increasingly likely, appearance frequencies that may even exceed long-term observations by an order magnitude. For estimation effective interfering waves, we suggest Grassberger-Procaccia dimensional...
Abstract Efficient all-optical switching is a challenging task as photons are bosons and cannot immediately interact with each other. Consequently, one has to resort nonlinear optical interactions, the Kerr gate being classical example. However, latter requires strong pulses switch weaker ones. Numerous approaches have been investigated overcome resulting lack of fan-out capability switches, most which relied on types resonant enhancement light-matter interaction. Here we experimentally...
A novel adjustable adiabatic soliton compression scheme is presented, enabling a coherent pulse source with pedestal-free, few-cycle pulses in the infrared or midinfrared regime. This relies on interaction of dispersive wave and copropagating at nearly identical group velocities fiber enhanced transmission. The achieved directly one stage, without necessity an external compensation scheme. Numerical simulations are employed to demonstrate this for silica fluoride fibers, indicating ultimate...
Brunel radiation appears as a result of two-step process photo-ionization and subsequent acceleration electron, without the need electron recollision. We show that for generation harmonics at all frequencies subcycle ionization dynamics is critical importance. Namely, such disappear low pump intensities when depends only on slow envelope (so called multiphoton regime) not instantaneous field. Nevertheless, if pulse contains incommensurate frequencies, mechanism does generate new even in regime.
Third-order optical nonlinearities play a vital role for the generation and characterization of ultrashort pulses. One particular method is frequency-resolved gating, which can be based on large variety third-order nonlinear effects. Any these variants presupposes an instantaneous temporal response, as it expected off resonance. In this paper we show that resonant excitation third harmonic gives rise to surprisingly decay times, are order duration shortest oscillator pulses generated date....
We demonstrate an up to now unrecognized and very effective mechanism which prevents filament collapse allows persistent self-guiding propagation retaining a large portion of the optical energy on axis over unexpected long distances. The key ingredient is possibility continuously leaking into normal dispersion regime via emission resonant radiation. frequency radiation determined by dynamically modified photogenerated plasma, thus allowing us excite new frequencies in spectral ranges are...
The concept of coherence is fundamental importance for describing the physical characteristics light and evaluating suitability experimental application. In case pulsed laser sources, pulse-to-pulse usually considered a judgment compressibility pulse train. This type often lost during propagation through highly nonlinear medium, pulses prove incompressible despite multioctave spectral coverage. Notwithstanding apparent loss interpulse coherence, however, supercontinua enable applications in...
We report on the direct experimental observation of pulse-splitting dynamics along a femtosecond filament. The fundamental pulse experiences significant self-shortening during propagation leading to durations 5.3 fs, corresponding sub-3 cycles, which is measured without external compression. A compression factor eight could be achieved in single filamentary stage. Theoretical modeling confirms our observed structures and gives further insight into nonlinear filamentation.
Fiber-optical rogue waves appear as rare but extreme events during optical supercontinuum generation in photonic crystal fibers. This process is typically initiated by the decay of a high-order fundamental soliton into solitons. Collisions between these solitons well with dispersive radiation affect trajectory frequency and time upon further propagation. Launching an additional wave at carefully chosen delay wavelength enables statistical manipulation such way that probability formation...
Competing nonlinear optical effects that act on femtosecond laser pulses propagating in a self-generated light filament may give rise to pronounced radial beam deformation, similar the z-pinch contraction of pulsed high-current discharges. This spatial is accompanied by pulse break-up can be beneficially exploited for on-axis temporal compression pulse. The pinching mechanism therefore explains recently observed self-compression and complicated spatio-temporal shapes typical propagation experiments.
Highly nonlinear wave propagation scenarios hold the potential to serve for energy concentration or pulse duration reduction of input form, provided that a small range parameters is maintained. Exploitation this mechanism compression ultimately limited by parameter fluctuations wave. With high ratios, it becomes increasingly difficult maintain control waveforms. Here, we suggest an alternative approach waveforms in highly system. Cascading self-compression cycles at reduced nonlinearity...
A plasma induced temporal break-up in filamentary propagation has recently been identified as one of the key events self-compression femtosecond laser pulses. An analysis Nonlinear Schrödinger Equation coupled to a noninstantaneous response yields set stationary states. This clearly indicates that emergence double-hump, characteristically asymmetric on-axis intensity profiles regimes where defocusing saturates optical collapse caused by Kerr self-focusing is an inherent property underlying...