In a previous paper [1], we studied transient radiation from scalar collimated volume source distributions subjected to impulsive excitation. In this paper, we extend our analysis and results to the case of nonimpulsive excitation, paying special attention to the parameterization of the radiation pattern of three-dimensional (3-D) ellipsoid source distributions driven by square pulses of finite...

Identifying strong and fast nonlinearities for today’s photonic applications is an ongoing effort1. Materials2–5 and devices6–9 are typically sought to achieve increasing nonlinear interactions. We report large enhancement of two-photon absorption through intrinsic resonances using extremely non-degenerate photon pairs. We experimentally demonstrate two-photon absorption enhancements by factors...

In the present paper Artificial Neural Networks (ANNs) models are proposed for the prediction of surface roughness in Electrical Discharge Machining (EDM). For this purpose two well-known programs, namely Matlab with associated toolboxes, as well as Netlab , were employed. Training of the models was performed with data from an extensive series of EDM experiments on steel grades; the proposed mo...

This paper presents the drop test reliability results for edge-bonded 0.5 mm pitch lead-free chip scale packages (CSPs) on a standard JEDEC drop reliability test board. The test boards were subjected to drop tests at several impact pulses, including a peak acceleration of 900 Gs with a pulse duration of 0.7 ms, a peak acceleration of 1500 Gs with a pulse duration of 0.5 ms, and a peak accelerat...

We review the theoretical and experimental status of intense laser alignment—a field at the interface between intense laser physics and chemical dynamics with potential applications ranging from high harmonic generation and nanoscale processing to stereodynamics and control of chemical reactions. After placing the intense laser approach in context with other alignment techniques, we proceed wit...

60 LLE Review, Volume 70 Traditionally, there have been many advantages to using laser beams with Gaussian spatial profiles in the study of high-field atomic physics. High peak intensities are achieved due to their focusability, they are easily generated in most laser systems, and their focal region can be described analytically. However, free electrons interacting with such a field are rapidly...

In this paper we develop a coherent control theory of the off resonance refractive index of a medium with a Gaussian pulse of coherent light. The refractive index of gaseous N i is studied by using this theory. It is found that the off resonance refractive index of gaseous N2 can be enhanced through the coherent control approach by changing the coherent parameters or the pulse duration of the c...

Introduction Parallel RF excitation using multi-element transmit coils is of interest to reduce pulse duration for spatially selective excitation. Originally, RF pulse design was formulated in the frequency domain for arbitrary k-space trajectories (Transmit-SENSE, [1]) or in the spatial domain for echo-planar trajectories [2]. Later, Transmit-SENSE was formulated in the spatial domain in [3] a...

The time-evolution of the fluorescence spectrum of a dissolved chromophore excited by an ultrafast pump pulse is considered. The average value of the energy difference of the solute in its excited and ground states is used to describe the relaxation of the maximum of the transient fluorescence spectrum to its equilibrium value ~dynamic Stokes shift, DSS!. A simple formula for the normalized DSS...

Introduction. Several methods proposed the use of the transient response of balanced steady-state free precession (bSSFP) for quantification of relaxation times and spin densities [1-3]. After inversion, the transition to steady state closely follows a mono-exponential signal behavior with an apparent relaxation rate T1* [1,4], which depends on the flip angle, T1 and T2. However, it has been sh...