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Ptychography, a phase retrieval method originally developed for crystallography [1], was recently adapted from real space imaging to the temporal domain for the characterization of ultrashort laser pulses [2]. Since then, several time-domain ptychography (TDP) pulse characterization schemes have been proposed and demonstrated, bearing experimental similarities, e.g., to second-harmonic frequency-resolved...
We report a novel breakup scenario of ultra-short high-order solitons in optical waveguides, via formation of a shock far below subcycle level, followed by a dramatic and complete transition into a dispersive wave.
Multiphoton absorption induced ultraviolet luminescence in ZnO nanorods is investigated with interferometric frequency-resolved optical gating. Power dependency exponents between 3 and 4 are extracted, consistent with simulations using Keldysh theory showing three-photon and four-photon absorption.
We propose a radically new way of rogue wave control, modifying the statistical distribution of events via suitable injection of dispersive waves. This allows reducing the frequency of rogue events rather than only increasing it.
We demonstrate direct feed-forward CEP control of a regenerative amplifier in a single stage, resulting in unprecedented sub-100 mrad phase jitters of an amplified system. Energy scalability of the approach is shown.
An adjustable adiabatic soliton compression scheme is presented, enabling pulse generation in the single-cycle regime. The compression comes without external dispersion compensation and is naturally stimulated by two-pulse collisions in an optical event horizon.
We demonstrate experimental evidence for non-instantaneous polarization decay in dielectrics. The few-femtosecond relaxation times agree favorable with solutions of the time-dependent Schrödinger equation and relate to resonances of the quantum mechanical dipole.
Rogue waves, by definition, are rare events of extreme amplitude. At the same time, they are surprisingly ubiquitous, in the sense that they can exist in a wide range of physical contexts and possess probability distributions that exhibit heavier tails than the normal Gaussian distribution. While many mechanisms have been demonstrated to explain the appearance of rogue waves in various specific systems,...
Rogue waves - originally reported in oceanography to cause unexpected fatalities to ships - have recently attracted a lot of attention as they seem to exist in a multitude of different wave-supporting physical systems. In optics, in particular, the pioneering work of Solli et al. [1] discussed an extreme-value distribution of wave amplitudes emerging from supercontinuum generation in a fiber. Here...
Carrier-envelope phase (CEP) control of mode-locked lasers has come of age, with recently demonstrated residual phase jitters approaching 10 mrad [1]. Such low jitter values could so far only be demonstrated with a novel feed-forward scheme [2] that relies on shifting the entire optical comb emerging from a mode-locked laser to zero offset frequency by means of an acousto-optic shifter. Compared to...
The appearance of rare but extremely powerful optical waves in a nonlinear fiber supercontinuum (SC) provided a surprising laboratory analogy of rogue waves [1]. The concept arises from a mysterious phenomenon of oceanic surfaces and appeared to be a ubiquitous phenomenon in nonlinear wave propagation. While there is a set of unified defining criteria for rogue waves across various physical systems,...
Carrier-envelope control is one of the key technologies for attosecond pulse generation. Although the timing jitter between the carrier and the envelope has recently been demonstrated down to sub-10-attosecond range [1], CEP control is still limited to a rather narrow class of lasers, including Ti:sapphire and some other selected broadband laser materials. Typically, stabilization of a CPA laser source...
Micro structured fibers and photonic crystal fibers are an enabling technology, allowing for white-light supercontinuum (SC) generation at the nanojoule pulse energy level available from laser oscillators. While the generation of octave-spanning optical spectra found widespread application in frequency metrology, spectroscopy, optical communications, and medical imaging [1], one of the most intriguing...
GaSb-based semiconductor saturable absorber mirrors (SESAM) are instrumental for extending mode-locking to new types of gain media operable in the 2–3 μm wavelength range [1,2]. Suitable SESAMs favorably incorporate lattice-matched GaSb/AlAsSb distributed Bragg reflectors (DBRs), which already provide a high reflectivity with a small amount of pairs while simultaneously exhibiting exceptionally broadband...
A novel two-color excitation scheme is discussed for generation of broadband white-light continua with superior coherence properties in photonic crystal fibers. These continua promise compression into the single-cycle regime.
Rogue wave formation from a high-order soliton in optical fibers can be inhibited by simultaneously launching dispersive waves at suitable delay, wavelength, and duration. Addition of low-energy wavepackets dramatically affects the emerging soliton amplitude statistics.
A novel scheme for feed-forward stabilization of the carrier-envelope phase of stabilized lasers is presented, which is virtually immune against slow drift effects and beam pointing variation.
We demonstrate that optical event horizons arise naturally in the supercontinuum generation by soliton fission with the ability to generate rare solitons with extreme high peak powers.
We present a novel setup for carrier-envelope phase stabilization combining a feedback loop with a feed-forward type stabilization technique to push the residual timing down to 8 attoseconds, setting a new record in stabilization performance.
We present direct experimental evidence for a non-instantaneous nonlinear response in TiO2. An asymmetry in interferometric FROG measurements indicates a relaxation time constant of about 5 fs.
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