The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We propose spatiotemporal solitons that consist of trains of short pulses. The pulses are collectively trapped in the transversal directions by a slow nonlinearity and each pulse is self-trapped temporally by a fast nonlinearity.
We apply pulse-front matching to a near-IR non-collinear optical parametric amplifier based on a bulk KTiOPO4 crystal. Pulses as broad as ~32 THz at ~1200 nm with almost no angular dispersion could be produced.
We propose a new approach to single-photon sources based on metamaterials with hyperbolic dispersion. Highly directional emission and dramatic reduction in spontaneous-emission lifetime due to the singularity in density-of-states leads to an ideal photon gun.
We present a novel type of stable (3+1)D solitary self-trapped wave-packet arising from the interplay between local and nonlocal (in time and space) nonlinearities, which can be generated under experimentally feasible conditions.
We characterize the behavior of optical pulse propagation in surfaces covered with silver metal nanoparticles and quantify the dispersion introduced as the pulse propagates.
We present a systematic numerical study of metamaterials integrated with gain media to achieve composite metamaterials at terahertz and infrared wavelength with reduced losses. The impact of spatial dispersion on the effective permeability resonance restoration is emphasized.
We measure the angular dependent response of a Swiss-cross metamaterial that has an effective index of n=-1.9 at normal incidence. It is experimentally shown how the effective properties depend on the incidence angle.
We experimentally observe a spatial optical shock with negative pressure/self-focusing nonlinearity on a partially-spatially-incoherent light. We examine its basic nonlinear properties and observe statistical wave damping.
The carrier-envelope phase dynamics of octave-spanning Ti:sapphire lasers are analyzed based on a one-dimensional laser. It is found that self-steepening is the major contributor to the energy dependent carrier-envelope phase and that center-frequency-shifts are negligible.
Transform limited ultrashort pulses are used in a laser-scanning two-photon microscope for imaging of various biological specimens, demonstrating the importance of dispersion-free imaging system. Pulse characterization, qualitative and quantitative data are presented.
We demonstrate first observations of slow-light enhanced three-photon absorption(ThPA) in photonic crystal waveguides.The injected pulses demonstrate self-phase modulation(SPM) with scalings deviating from ng2(SPM) and ng3(ThPA).A thorough analysis suggests pulse compression leading to increased peak powers.
Optical waveguides formed from coupled ultrahigh-Q cavities are investigated by finite-difference time-domain (FDTD) simulation. Ultra-high group velocity dispersion together with a group velocity as low as 3times10-5 c is predicted at the band edge. It is shown that full compensation of the group velocity dispersion for chip free slow light (~c/100) over a bandwidth of 230 GHz is possible using a...
A polymer THz fiber made of Topas and having a Photonic Crystal Fiber structure is demonstrated. It has low broadband loss and the dispersion of the fiber can be tailored by adjusting the structural parameters.
Beyond the well known breathing of dispersion-managed solitons, a long-period oscillation has been reported. We identify the origin of this oscillation: These solitons are composite objects; the constituents can beat with each other.
We found that 25% of the input power of a 2 mum wavelength 1 kW peak-power source can be shifted into the region between 3-5 mum using an As2S3-based chalcogenide PCF. Tapering increases the output at wavelengths above 4 mum.
We introduce an improved method for standoff chemical detection of films and residues on solid targets which scatter or reflect the incident light using single-beam Coherent anti-Stokes Raman Scattering.
We employ a novel dynamical approach to study the slow saturable absorber mode-locking with noise. We obtain explicit expressions for the condition of pulse existence and continuum stability, the pulse power and the minimal pulse width, and present the guidelines for optimal system configuration.
A time-gated filter is demonstrated that converts a double-sideband radio-frequency waveform on a pulsed optically chirped carrier into a single sideband waveform. The filter is used to reduce the dispersion penalty in time-stretch ADCs.
We demonstrate a new type of optical coherence tomography using only classical resources to achieve results that are typically associated with quantum-enhanced metrology: factor-of-two axial resolution enhancement and even-order dispersion cancellation.
We present a perturbation theory explaining the interaction of adjacent dispersion managed solitons. A stable equilibrium separation and oscillations around it are found. The model is validated by comparison to experimental and numerical results.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.