A method to measure the aberration function for a crystalline specimen from a single inline hologram or 'Ronchigram' by dividing it up into small patches is derived. Measurement of aberrations is demonstrated from both dynamical simulations and experimental Ronchigrams. This method should allow rapid fine-tuning on a variety of crystalline specimens and represents a key step toward active optic...

Seventy-five years after its invention, transmission electron microscopy has taken a great step forward with the introduction of aberration-corrected electron optics. An entirely new generation of instruments enables studies in condensed-matter physics and materials science to be performed at atomic-scale resolution. These new possibilities are meeting the growing demand of nanosciences and nan...

In anticipation of an Electron Cyclotron Resonance Heating system upgrade for the stellarator Wendelstein 7-X, a 1.5 MW - 140 GHz continuous-wave gyrotron is under development. order to provide first experimental verification scientific RF and electron beam optics design with ms pulses, Karlsruhe Intitule Technology has developed short-pulse pre-prototype gyrotron. this work, we present details...

The second-order [Formula: see text] process underpins many important nonlinear optical applications in the field of classical and quantum optics. Generally, manifests itself only a non-centrosymmetric dielectric medium via an anharmonic electron oscillation when driven by intense field. Due to inversion symmetry, group-IV semiconductors, such as silicon (Si) germanium (Ge), are traditionally n...

Accurate modeling of image formation in cryo-electron microscopy is an important requirement for quantitative image interpretation and optimization of the data acquisition strategy. Here we present a forward model that accounts for the specimen's scattering properties, microscope optics, and detector response. The specimen interaction potential is calculated with the isolated atom superposition...

Since its birth, the laser has been extraordinarily effective in the study and applications of lasermatter interaction at the atomic and molecular level and in the nonlinear optics of the bound electron. In its early life, the laser was associated with the physics of electron volts and of the chemical bond. Over the past ten years, however, we have seen a surge in our ability to produce high in...

Nanotips are used as electron point sources in the Fresnel projection microscope (FPM). The FPM allows imaging in direct space of free standing nanometric fibres at working voltages around 200 V with observation of details of less than one nanometer. These observations are made without irradiation damage, particularly useful for soft materials such as organic or biological molecules (polymers a...