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Mostafa Shalaby

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Related publications (22)

Coherent and incoherent ultrafast magnetization dynamics in 3d ferromagnets driven by extreme terahertz fields

Mostafa Shalaby, Christoph Peter Hauri

2018

Low frequency terahertz-induced demagnetization in ferromagnetic nickel

Mostafa Shalaby, Christoph Peter Hauri

A laser stimulus at terahertz (THz) frequency is expected to offer superior control over magnetization dynamics compared to an optical pulse, where ultrafast demagnetization is mediated by heat deposition. As a THz field cycle occurs on a timescale similar ...

Amer Inst Physics2016

Visualization of Terahertz radiation on silicon-based CCD and CMOS sensor at high resolution

Mostafa Shalaby, Christoph Peter Hauri

Low frequency THz radiation is visualized by means of a charged-coupled device designed for optical frequencies and a CMOS sensor. This technological advance opens novel opportunities in THz imaging as it offers smallest pixel size and large chip size at l ...

Ieee2016

Simultaneous electronic and the magnetic excitation of a ferromagnet by intense THz pulses

Mostafa Shalaby, Christoph Peter Hauri

The speed of magnetization reversal is a key feature in magnetic data storage. Magnetic fields from intense THz pulses have been recently shown to induce small magnetization dynamics in a cobalt thin film on the sub-picosecond time scale. Here, we show tha ...

Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft2016

Intense THz source based on BNA organic crystal pumped at Ti:sapphire wavelength

Mostafa Shalaby, Christoph Peter Hauri

We report on high-energy terahertz pulses by optical rectification (OR) in the organic crystal N-benzyl-2-methyl-4-nitroaniline (BNA) directly pumped by a conventional Ti:sapphire amplifier. The simple scheme provides an optical-to-terahertz conversion eff ...

Optical Soc Amer2016

High-power femtosecond Raman frequency shifter

Mostafa Shalaby, Christoph Peter Hauri

We report on the generation of broadband, high-energy femtosecond pulses centered at 1.28 mu m by stimulated Raman scattering in a pressurized hydrogen cell. Stimulated Raman scattering is performed by two chirped and delayed pulses originating from a mult ...

Optical Soc Amer2016

Intense THz source based on BNA organic crystal pumped at conventional Ti:Sapphire wavelength

Mostafa Shalaby, Christoph Peter Hauri

We report on high-energy terahertz pulses by optical rectification (OR) in the organic crystal N-benzyl-2-methyl-4-nitroaniline (BNA) directly pumped by a conventional Ti: sapphire amplifier. The simple scheme provides an optical-to-terahertz conversion ef ...

Ieee2016

High-energy femtosecond hydrogen Raman laser

Mostafa Shalaby, Christoph Peter Hauri

High-energy pulses at 1.28 mu m are demonstrated by stimulated Raman scattering using two chirped pulses of a Ti:Sapphire laser in hydrogen. The Stokes pulse carrying record-high energy of 4.4 mJ is recompressed to 80 fs. ...

Ieee2016

Terahertz-induced demagnetization in ferromagnets

Mostafa Shalaby, Christoph Peter Hauri

We experimentally demonstrate ultrafast terahertz induced demagnetization in conducting ferromagnets, Ni, Co, and Fe. At even higher excitation fluence, the materials lose their magnetic properties and then get damaged before magnetic switching takes place ...

Ieee2016

Multi-mJ infrared femtosecond hydrogen Raman laser

Mostafa Shalaby, Christoph Peter Hauri

High-energy pulses at 1.28 mu m are demonstrated by stimulated Raman scattering in hydrogen using two chirped pulses of a Ti: Sapphire laser. The Stokes pulse carrying record-high energy of 4.4 mJ is recompressed to 80 fs. ...

Ieee2016

Extreme laser spectral broadening driven by intense THz field

Mostafa Shalaby, Christoph Peter Hauri

We present giant spectral broadening by cross phase modulation of a 60 fs nIR pulse in GaP by means of an intense Terahertz transient. The THz field induces up to 500% spectral broadening supporting sub-10 fs nIR pulses. ...

Ieee2016

Simultaneous electronic and magnetic excitation of cobalt by intense THz pulses

Mostafa Shalaby, Christoph Peter Hauri

We study the interaction of intense THz magnetic fields with ferromagnetic thin films. At higher field intensities, the THz electric field starts playing a role, strongly changing the dielectric properties of the cobalt thin film. ...

Ieee2016

Air nonlinearity triggered by an ultra-intense 33 MV/cm and sub-5 THz light bullet

Mostafa Shalaby, Christoph Peter Hauri

We report on measurements of the instantaneous Kerr nonlinearity and the retarded alignment of non-polar molecules CO2, N-2, and O-2 by an intense, lambda-cubic terahertz pulse with peak field > 33 MV/cm centered at 3.9 THz. ...

Ieee2016

Spectrally intense terahertz source based on triangular selenium

Mostafa Shalaby, Christoph Peter Hauri

We show that triangular selenium has excellent phase matching for THz generation through optical rectification in the range 0.1-4 THz. The performance exceeds that of the state-of-the-art organic crystals. ...

Ieee2016

Extreme cross-phase modulation driven by intense THz field

Mostafa Shalaby, Christoph Peter Hauri

We present giant cross phase modulation of a 60 fs nIR pulse in GaP by means of an intense Terahertz transient. The THz field induces up to 500% spectral broadening supporting sub-10 fs nIR pulses. ...

Ieee2016

High-performing nonlinear visualization of terahertz radiation on a silicon charge-coupled device

Mostafa Shalaby, Christoph Peter Hauri

Photoinduced electron transitions can lead to significant changes of the macroscopic electronic properties in semiconductors. This principle is responsible for the detection of light with charge-coupled devices. Their spectral sensitivity is limited by the ...

Nature Publishing Group2015

Demonstration of a low-frequency three-dimensional terahertz bullet with extreme brightness

Mostafa Shalaby, Christoph Peter Hauri

The brightness of a light source defines its applicability to nonlinear phenomena in science. Bright low-frequency terahertz (

Nature Research2015

Air nonlinear dynamics initiated by ultra-intense lambda-cubic terahertz pulses

Mostafa Shalaby, Christoph Peter Hauri

We report on the measurement of the instantaneous Kerr nonlinearity and the retarded alignment of air molecules CO2, N-2, and O-2 triggered by an intense, lambda-cubic terahertz pulse, a diffraction-and transform-limited single-cycle pulse. The strong-fiel ...

AIP American Institute of Physics2015

Spectrally intense terahertz source based on triangular Selenium

Mostafa Shalaby, Christoph Peter Hauri

The intensity of a nonlinear terahertz (THz) source is primarily given by its spectral density. In this letter, we introduce triangular Selinium (Se) as a novel THz emitter and show numerically its superior properties to the currently used crystals for int ...

Nature Publishing Group2015

Temporal and spectral shaping of broadband terahertz pulses in a photoexcited semiconductor

Mostafa Shalaby, Christoph Peter Hauri

Transmission through a photoexcited semiconductor is used to temporally and spectrally shape a terahertz (THz) pulse. By adjusting the optical pump-THz probe delay, we experimentally introduce a polar asymmetry in the pulse profile as large as 92%. To shap ...

AIP American Institute of Physics2015

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