نتایج جستجو برای: gradient index optics
تعداد نتایج: 548366 فیلتر نتایج به سال:
We present a simple quantum memory scheme that allows for the storage of a light field in an ensemble of two-level atoms. The technique is analogous to the NMR gradient echo for which the imprinting and recalling of the input field are performed by controlling a linearly varying broadening. Our protocol is perfectly efficient in the limit of high optical depths and the output pulse is emitted i...
The study of volume gratings has led to useful applications in many areas of optics, including integrated optics, acousto-optics, and holography. In most situations the coupled-mode analysis of volume holograms established by Kogelnik1 accurately describes the diffraction behavior of a thick hologram and predicts a diffraction efficiency that is a periodic function of the index perturbation amp...
We are indebted to Drs. ABSTRACT. In view of mis-statements made in the literature, the origin of the refractive index in electron optics is discussed in some detail, and the uniqueness of an expression previously given IS demonstrated. On this basis, some general properties of electron optics are investigated. Whereas the refractive index is unique in terms of the magnetio vector potential A, ...
Solar sails with the capability of generating a tangential radiation pressure at sun-pointing attitude, such as refractive can provide more efficient methods for attitude and orbital control sailcraft. This paper presents concept gradient-index sail an advanced class sail, which operates by guiding solar through structure made graded index material. The design sail's distribution is performed t...
We report various accelerator physics studies and improvements from the 1997/98 run at the Stanford Linear Collider (SLC). In particular, we discuss damping-ring lattice diagnostics, changes to the linac set up, fast control for linac rf phase stability, new emittance tuning strategies, wakefield reduction, modifications of the final-focus optics, longitudinal bunch shaping, and a novel spot-si...
Elastic guided wave focusing is of great interest for applications such as vibroacoustic control, energy harvesting, or Structural Health Monitoring. Different strategies allow generation this effect, GRadient-INdex devices in particular exploit medium with varying properties thickness to reproduce an adequate refractive index profile optics. The resulting continuous profiles have a curved geom...
Retrieval of vertical profiles of temperature and humidity parameters using a VHF radar is described in this paper. For this, Indian MST radar located at Gadanki (13.5◦ N, 79.2◦ E) has been operated in a special mode. First, vertical velocities are collected continuously using the radar and are subjected to Fast Fourier Transform (FFT) analysis to obtain Brunt-Väisälä oscillations. From the mea...
The radar ray path and beam broadening equations are important for assimilation of radar data into numerical weather prediction (NWP) models. They can be used to determine the physical location of each radar measurement and to properly map the atmospheric state variables from the model grid to the radar measurement space as part of the forward observation operators. Historically, different degr...
Abstract Stochastic Gradient Algorithms (SGAs) are ubiquitous in computational statistics, machine learning and optimisation. Recent years have brought an influx of interest SGAs, the non-asymptotic analysis their bias is by now well-developed. However, relatively little known about optimal choice random approximation (e.g mini-batching) gradient SGAs as this relies on variance problem specific...
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