Publications de Christoph Peter Hauri

A compact and cost-effective hard X-ray free-electron laser driven by a high-brightness and low-energy electron beam

Majed Chergui, Leonid Rivkin, Giulia Fulvia Mancini, Rasmus Ischebeck, Camila Bacellar Cases Da Silveira, Mike Seidel, Christoph Peter Hauri, Paul Beaud, Christopher Alexander Arrell, Eugenio Ferrari

We present the first lasing results of SwissFEL, a hard X-ray free-electron laser (FEL) that recently came into operation at the Paul Scherrer Institute in Switzerland. SwissFEL is a very stable, compact and cost-effective X-ray FEL facility driven by a lo ...

Nature Publishing Group2020

Generation of strong-field spectrally tunable terahertz pulses

Christoph Peter Hauri

The ideal laser source for nonlinear terahertz spectroscopy offers large versatility delivering both ultra-intense broadband single-cycle pulses and user-selectable multi-cycle pulses at narrow linewidths. Here we show a highly versatile terahertz laser pl ...

2020

Experimental station Bernina at SwissFEL: condensed matter physics on femtosecond time scales investigated by X-ray diffraction and spectroscopic methods

Christopher Alexander Arrell, Christoph Peter Hauri, Paul Beaud, Giulia Fulvia Mancini, Jochen Rittmann

The Bernina instrument at the SwissFEL Aramis hard X-ray free-electron laser is designed for studying ultrafast phenomena in condensed matter and material science. Ultrashort pulses from an optical laser system covering a large wavelength range can be used ...

International Union of Crystallography (IUCr)2019

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

Christoph Peter Hauri, Mostafa Shalaby

2018

Spectrally intense terahertz source based on triangular selenium

Christoph Peter Hauri, Mostafa Shalaby

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

Simultaneous electronic and magnetic excitation of cobalt by intense THz pulses

Christoph Peter Hauri, Mostafa Shalaby

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

Christoph Peter Hauri, Mostafa Shalaby

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

Low frequency terahertz-induced demagnetization in ferromagnetic nickel

Christoph Peter Hauri, Mostafa Shalaby

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

Christoph Peter Hauri, Mostafa Shalaby

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

Multi-mJ infrared femtosecond hydrogen Raman laser

Christoph Peter Hauri, Mostafa Shalaby

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