نتایج جستجو برای: ultrashort
تعداد نتایج: 4043 فیلتر نتایج به سال:
Laser filamentation is understood to be self-channeling of intense ultrashort laser pulses achieved when the self-focusing because of the Kerr nonlinearity is balanced by ionization-induced defocusing. Here, we show that, right behind the ionized region of a laser filament, ultrashort laser pulses can couple into a much longer light channel, where a stable self-guiding spatial mode is sustained...
We experimentally demonstrate shaping of the two-photon wave function of entangled-photon pairs, utilizing coherent pulse-shaping techniques. By performing spectral-phase manipulations we tailor the second-order correlation function of the photons exactly like a coherent ultrashort pulse. To observe the shaping we perform sum-frequency generation with an ultrahigh flux of entangled photons. At ...
Experimental results are presented from vacuum-ultraviolet free-electron laser (FEL) operating in the self-amplified spontaneous emission (SASE) mode. The generation of ultrashort radiation pulses became possible due to specific tailoring of the bunch charge distribution. A complete characterization of the linear and nonlinear modes of the SASE FEL operation was performed. At saturation the FEL...
Abstract We investigate two-photon double ionization of helium by intense (≈ 1015 W/cm2) ultrashort (≈ 300 as) soft X-ray pulses (E = 91.6 eV). The time-dependent two-electron Schrödinger equation is solved using a coupled channel method. We show that for ultrashort pulses the angular distribution of ejected electrons depends on the pulse duration and provides novel insights into the role of el...
The recently introduced concept of radially non-oscillating, temporally stable ultrashort-pulsed Bessel-like beams we referred to as needle beams is generalized to a particular class of highly localized wavepackets (HLWs). Spatio-temporally quasi-nondiffracting pulses propagating along extended zones are shaped from Ti:sapphire oscillator radiation with a spatial light modulator and characteriz...
We theoretically describe ultrashort self-similar pulses propagating in coherent linear absorbers near optical resonance and propose a method for their experimental realization.
The influence of the precursor fields of a double resonance Lorentz model dielectric on ultrashort pulse autocorrelation measurements and the resultant dynamical pulse width evolution is presented.
A simple method for the generation of ultrashort pulse train with high-repetition-rate is proposed and demonstrated numerically. OCIS codes: (320.5520) Pulse compression; (320.5540) Pulse shaping
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