Concept

Beam divergence

Related publications (104)

Development of a ToF setup with an ion - guide for characterization of electrospray microthrusters

Herbert Shea, Caglar Ataman, Simon Dandavino, Daniel George Courtney, Subha Chakraborty

Electrospray microthrusters are a very promising micro-propulsion system which can potentially provide very high specific impulse (Isp ~ 3000s). In this paper, we report on the development of a time-of-flight (ToF) measurement setup for characterization of ...

2013

Field Measurements of Wind Turbine Wakes with Lidars

Fernando Porté Agel, Giacomo Valerio Iungo, Yu-Ting Wu

Field measurements of the wake flow produced from a 2-MW Enercon E-70 wind turbine were performed using three scanning Doppler wind lidars. A GPS-based technique was used to determine the position of the wind turbine and the wind lidar locations, as well a ...

Amer Meteorological Soc2013

Multiple Phase Anomalies in Bessel Beam

Hans Peter Herzig, Toralf Scharf, Myun Sik Kim

The non-diverging feature of the Bessel-kind beam leads to multiple phase anomalies along the optical axis in contrary to the focused Gaussian beam. Here, we analyze the phase distributions using in a longitudinal-differential phase mode of a high-resoluti ...

2013

A dual-axis pointing mirror with moving-magnet actuation

Nico de Rooij, Caglar Ataman, Wilfried Noell, Sébastien Lani

A large-aperture and large-angle MEMS-based 2D pointing mirror is presented. The device is electromagnetically actuated by a moving-magnet/stationary-coil pair and potentially suited for high power laser beam shaping and beam pointing applications, such as ...

Institute of Physics2013

Monte Carlo modeling of crystal channeling at high energies

Alessio Ferrari, Philippe Jean Schoofs, Francesco Cerutti

Channeling in bent crystals is becoming a reliable and efficient technique for collimating beams. At CERN, the installation of crystals in LHC is under scrutiny by the UA9 collaboration with the goal of investigating if they are a viable option for the col ...

Elsevier2013

Vertical cavity surface emitting laser cavity with low thermal impedance

Elyahou Kapon, Vladimir Iakovlev, Pascal Gallo

The present invention concerns new designs of VCLs with high contrast gratings (HCG) combined with diamond layer as a bottom mirror. They can be realized either with a classical V-shaped pumping scenario, or through the introduction of the pumping beam fro ...

2013

Phase-Shift Master-Slave Mechanisms for High Angular-Speed Wedge-Prism Systems

Reymond Clavel, Olivier Chappuis

Laser micro-machining requires high dynamic laser spot trajectory and accuracy to control the laser beam scanning. A well-known technique to scan a laser beam over a specimen is to use a pair of wedge-prisms. However, it is difficult to master-slave the ph ...

Taylor & Francis Inc2013

Application of Adaptive Optics to Focusing and Imaging

Daniel Iwaniuk

Adaptive optics is used to abate aberrations with a wavefront correction. It is widely used in astronomy and is starting to expand into applications of laser focusing and imaging with high numerical apertures, e.g. microscopy. The physical background of fo ...

EPFL2012

Production of long bunch trains with 4.5 mu C total charge using a photoinjector

Daniel Egger, Öznur Mete

A photoinjector, PHIN (PHotoINjector), has been realized at CERN by a joint effort of several institutes within the European Coordinated Accelerator Research in Europe program. The test facility has been installed and commissioned at CERN with the aim to d ...

2012

Third-harmonic generation microscopy with Bessel beams: a numerical study

We study theoretically and numerically third-harmonic generation (THG) from model geometries (interfaces, slabs, periodic media) illuminated by Bessel beams produced by focusing an annular intensity profile. Bessel beams exhibit a phase and intensity distr ...

Optical Soc Amer2012

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