Abstract The quantum vacuum plays a central role in physics. Quantum electrodynamics (QED) predicts that the properties of fermionic can be probed by extremely large electromagnetic fields. typical field amplitudes required correspond to onset ‘optical breakdown’ this vacuum, expected at light intensities >4.7×10 29 W/cm 2 . Approaching ‘Schwinger limit’ would enable testing major but still ...

The non-linear optical properties of SWNTs are at the centre of an expanding area of research. SWNTs are good saturable absorbers with an ultrafast recovery time, i.e. they are pass-high filters for light, becoming transparent for sufficiently high incident power [1, 2]. This makes them ideal components for a wide range of photonic devices, such as all-optical switches, pulse compressors, noise...

‎We study the existence of soliton solutions for a class of‎ ‎quasilinear elliptic equation in $mathbb{textbf{R}}^2$ with critical exponential growth‎. ‎This model has been proposed in the self-channeling of a‎ ‎high-power ultra short laser in matter‎.

The frequency-dependent group delay of dielectric mirrors was measured by spectrally resolved white-light interferometry. Chirped mirrors and thin-film Gires-Tournois interferometers designed for dispersion control in a femtosecond Ti:sapphire laser oscillator-amplifier system were tested with a group-delay resolution of +/-0.2 fs and a spectral resolution of ~1 nm over the spectral range of 67...

In this paper, we present an Yb-doped Y2O3 waveguide laser fabricated by pulsed laser deposition (PLD) that is Q-switched using a mono-layer graphene saturable absorber. 140 ns pulses at a repetition rate of 1.21 MHz and pulse energy of 14 nJ are achieved at an absorbed pump power of 528 mW. Introduction: Pulsed lasers have a range of applications in areas such as medicine, material processing,...

An approach for the theoretical evaluation of the damage threshold in optical interference coatings that combine metal and dielectric films is presented. The model that is used combines a matrix formalism to describe the film system with the two temperatures model that describes the energy transfer and the temperatures of electrons and lattice in a solid submitted to a laser irradiation at the ...

this study is focused on investigating the parameters of laser percussion drilling process of nickel-base super alloy inconel 718 with thickness of 1 mm. fiber laser with the power of 500 watts was used as the laser source. laser pulse frequency, duty cycle, laser power, focal point position, were assumed as the laser drilling process variables. the hole geometry features, i.e. entrance hole di...