Improved field scanner incorporating parabolic optics Part 1: Simulation

Sound Field Simulation by Computational Acoustics - Part I: Simulation Algorithm

Parabolic lithium refractive optics for x rays

Excellent x-ray optics for photons at around 10 keV can be expected with lithium metal. One of the best compound refractive lens designs @Lengeler et al., J. Appl. Phys. 84, 5855 ~1998!# is now produced routinely in aluminum, and more recently has been demonstrated using beryllium @M. Kuhlmann et al. ~unpublished!#. Here, we report a similar refractive lens made from lithium. At 10.87 keV, this...

Visual stimulus presentation using fiber optics in the MRI scanner.

Imaging the neural basis of visuomotor actions using fMRI is a topic of increasing interest in the field of cognitive neuroscience. One challenge is to present realistic three-dimensional (3-D) stimuli in the subject's peripersonal space inside the MRI scanner. The stimulus generating apparatus must be compatible with strong magnetic fields and must not interfere with image acquisition. Virtual...

Phase - Field Simulation of Solidification 1

W. J. Boettinger,1 J. A. Warren,1 C. Beckermann,2 and A. Karma3 1Metallurgy Division, Materials Science and Engineering Laboratory, NIST, Gaithersburg, Maryland 20899; e-mail: [email protected]; [email protected] 2Department of Mechanical and Industrial Engineering, University of Iowa, Iowa City, Iowa 52242; e-mail: [email protected] 3Department of Physics and Center for Inter...

Adaptive Optics for Improved Mode - Coupling Efficiencies

Low insertion loss is a critical requirement for some newly emerging applications, such as optical quantum computing. We have demonstrated improved free-space to single-mode fiber coupling via wavefront correction using an adaptive-optic (AO) mirror. By introducing AO correction paired with a three-step optimization algorithm, we have obtained 97.3 ± 0.3% of the Fresnel-reflection-limited mode-...