The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Full exploitation of emittance exchange (EEX) requires aberration-free performance of a complex imaging system including active radio-frequency (rf) elements which can add temporal distortions. We investigate the performance of an EEX line where the exchange occurs between two ...

* Dr. O. Solgaard is now with the Department of Electrical and Computer Engineering, UC Davis, CA 95616. ABSTRACT This paper describes the design and fabrication of micromachined resonant scanners that have large scan angles at fast scan speeds. Driven by an electrostatic comb motor, these 200 μm by 250 μm scanning-micromirrors can scan about 12o (optical) at the resonance frequency of 3 kHz wi...

An optimal strategy for cascading phased-array deflectors is presented that allows for high-resolution random-access beam steering with continuous scan-angle control but requires a minimum number of control lines. The system is analyzed theoretically by use of a Fourier optics approach and then verified experimentally. A pair of 32-channel optical phased arrays fabricated by use of surface elec...

The optical Einstein ring 0047−2808 was imaged by the VLT UT1 during the science verification programme. The ring is the image of a high–redshift z = 3.595 star–forming galaxy, with strong Lyα emission at 5589Å, gravitationally lensed by a massive early–type galaxy at z = 0.485. Relative to earlier NTT data the high signal– to–noise ratio of the VLT Lyα narrow–band image allows much improved co...

A fast tunable filtering technique is proposed associating a diffraction grating with an intracavity Bragg grating. The bandwidth and the tuning range of this filter can be easily adapted by changing the diffraction grating's orientation, or its period, and its response is uniform over the whole tuning range. A numerical simulation of the filter response to a Gaussian beam has been developed, a...

The paper discusses determining crane block trajectories using the finite element method (FEM). mathematical formulation for air resistance of hooks’ is presented with kinematic analysis block. three blocks are considered: without wind deflector, a spherical deflector and cylindrical fairing. hook was assumed as physical pendulum. FEM provided movement consideration. Movement different speeds d...

We present a spectrometer for inverse photoemission in the vacuum ultraviolet range with variable energy resolution between 400 and 165 meV full width at half maximum. The energy distribution of the electron beam used for excitation can be adjusted between 300 and 125 meV by the use of a toroidal 90 degrees electrostatic deflector combined with a slit aperture. The emitted photons are detected ...

The optical Einstein ring 0047 − 2808 was imaged by the VLT UT1 during the science verification programme. The ring is the image of a high–redshift z = 3.595 star– forming galaxy, with strong Lyα emission at 5589Å, gravita-tionally lensed by a massive early–type galaxy at z = 0.485. Relative to earlier NTT data the high signal–to–noise ratio of the VLT Lyα narrow–band image allows much improved...