Publications de Fernando Ardana Lamas

Femtosecond electron and X-ray source developments for time-resolved applications

This manuscript summarizes the different technological developments and scientific activities in the field of ultrafast laser and electron physics which I have carried out as part of my PhD thesis. The topics addressed in my thesis range from the developme ...

EPFL2016

Towards enabling femtosecond helicity-dependent spectroscopy with high-harmonic sources

Fernando Ardana Lamas, Christoph Peter Hauri

Recent advances in high-harmonic generation gave rise to soft X-ray pulses with higher intensity, shorter duration and higher photon energy. One of the remaining shortages of this source is its restriction to linear polarization, since the yield of generat ...

Nature Publishing Group2015

Filling the Entire Terahertz Frequency Gap by Single-Cycle MV/Cm Pulses

Fernando Ardana Lamas, Christoph Peter Hauri

We demonstrate highly efficient Terahertz production and absolute phase control in the hardly accessible THz frequency gap (1-15 THz) by optical rectification in organic crystals leading to single-cycle field oscillations beyond 150MV/m and 0.5 Tesla. ...

Springer-Verlag Berlin2015

Coherent Ultrafast Magnetization Dynamics Non-resonantly Induced in Cobalt by an Intense Terahertz Transient

Fernando Ardana Lamas, Christoph Peter Hauri

We demonstrate non-resonant magnetization dynamics in the ferromagnetic cobalt thin film induced by a record high-field Terahertz pulse. The magnetization dynamics are coherent and exactly follow the THz carrier oscillations. ...

Springer International Publishing2015

A scheme for a shot-to-shot, femtosecond-resolved pulse length and arrival time measurement of free electron laser x-ray pulses that overcomes the time jitter problem between the FEL and the laser

Fernando Ardana Lamas, Christoph Peter Hauri, Ishkhan Gorgisyan, Rasmus Ischebeck

The recent entry of X-ray free electron lasers (FELs) to all fields of physics has created an enormous need, both from scientists and operators, for better characterization of the beam created by these facilities. Of particular interest is the measurement ...

Institute of Physics2014

Filling the entire Terahertz frequency gap by single-cycle MV/cm pulses

Fernando Ardana Lamas, Christoph Peter Hauri

OSA2014

Coherent ultrafast magnetization dynamics non-resonantly induced in cobalt by an intense Terahertz transient

Peter Derlet, Fernando Ardana Lamas, Christoph Peter Hauri

OSA2014

Terahertz-driven non-resonant magnetization dynamics in cobalt

Peter Derlet, Fernando Ardana Lamas, Christoph Peter Hauri

OSA2014

THz streaking of attosecond pulse trains

Fernando Ardana Lamas, Christoph Peter Hauri, Ishkhan Gorgisyan

OSA2014

Off-resonant magnetization dynamics phase-locked to an intense phase-stable terahertz transient

Fernando Ardana Lamas, Christoph Peter Hauri

Controlling magnetization dynamics with a femtosecond laser is attracting interest both in fundamental science and in industry because of the potential to achieve magnetic switching at ever faster speeds. Here, we report a coherent, phase-locked coupling b ...

Nature Publishing Group2013

Spectral characterization of fully phase-matched high harmonics generated in a hollow waveguide for free-electron laser seeding

Fernando Ardana Lamas, Christoph Peter Hauri

We present a bright and coherent soft x-ray source based on high harmonic generation delivering up to 10(10) photons per second centered at 120 eV within an 80 eV bandwidth. The source profits from fully phase-matched harmonic generation in an unmodulated ...

Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft2013

Towards high brightness electron beams from multifilamentary Nb3Sn wire photocathode

Fernando Ardana Lamas, Christoph Peter Hauri

In order to find electron sources of low emittance and high quantum efficiency, single tip cathodes with a microstructured surface are investigated. Emission currents up to 310 A were obtained, by combining a 2 ns, 50 kV accelerating voltage pulse with a 2 ...

American Physical Society2013

Quantum efficiency of technical metal photocathodes under laser irradiation of various wavelengths

Fernando Ardana Lamas, Christoph Peter Hauri

Quantum efficiency studies for various laser wavelengths and various technical metal surfaces were carried out in a dedicated unbaked vacuum chamber in the absence of a significant electrical field. Copper, magnesium, aluminum, and aluminum-lithium photoca ...

Springer Verlag2013

Large Charge Extraction from Metallic Multifilamentary Nb3Sn Photocathode

Fernando Ardana Lamas, Christoph Peter Hauri

The current density limit for photoemission from metals was measured in an rf photogun to be below 10(9) A/m(2). We have achieved 1.6 x 10(11) A/m(2) by photofield emission from a new type of photocathode made from a metallic-composite, multifilamentary Nb ...

2012

Laser-driven generation of intense single-cycle THz field

Fernando Ardana Lamas, Christoph Peter Hauri

We report on laser-based, high power single-cycle THz source. The THz radiation is generated by four-wave mixing in plasma and by optical rectification in organic salt crystal pumped by powerful optical parametric amplifier. The first approach permits the ...

2012

High quantum efficiency, low emittance electron beam from multifilamentary cathodes

Fernando Ardana Lamas, Christoph Peter Hauri

We present a new type of metallic cathode, reaching quantum efficiency of 10(3). This value together with the estimated emittance, gives a brilliance of 2.8x10(13) A/m(2), making this cathode an excellent candidate for an ultrashort electron source. (C) 20 ...

Ieee2012

Towards High-power Single-cycle THz Laser for Initiating High-field-sensitive Phenomena

Fernando Ardana Lamas, Christoph Peter Hauri

Powerful THz radiation confined in one field period or less is an adequate tool for triggering nonlinear actions. We show results towards the realization of a tunable high-power THz source based on a laser-driven frequency conversion scheme in plasma and n ...

2011

Strong-field single-cycle THz pulses generated in an organic crystal

Fernando Ardana Lamas, Christoph Peter Hauri

We present high-power single-cycle carrier-envelope phase locked THz pulses at a central frequency of 2.1 THz with MV/cm electric field strengths and magnetic field strengths beyond 0.3 T. The THz radiation is generated by optical rectification in an organ ...

American Institute of Physics2011