As of today, one of the milestones in quantum theory testing is obtaining of macroscopic quantum states, for which very low temperatures are necessary. Such low energies can be present during optical and optomechanical cooling of nanostructures. Here we investigate the deep cooling of ytterbium-doped fluorite nanocrystal via coherent population transfer techniques. We consider two main approaches towards coherent transfer, namely, Raman pulses and stimulated Raman adiabatic passage, and search for the most efficient cooling parameters. Optimization of the process of deep nanocrystal cooling opens up possibilities for various applications and technologies.
In this paper we propose an investigation of digital optical phase conjugation (DOPC) method applicability and efficiency for the problem of three-dimensional (3D) holographic imaging. We validate the basic properties of developed DOPC-based method for different cases of imaging objects, from simple two-dimensional (2D) case to 3D figure composed of 2D polygons. We implement the method of adaptive optimization of the wavefront (AOWF) for auxiliary image formation. Since the simplicity and universality of AOWF method, this approach is useful for the fast basic 3D holographic image formation.
In this paper we propose a technique of the distribution of transparent particles suspended in a volume investigation.
We use a method that implies division of the volume into a plurality of layers containing particles therein.
An inline hologram of this volume is reconstructed in two adjacent layers, which are compared using correlation
function. We have derived dependencies of correlation on particle parameters. We perform an experimental
validation of this study. This technique is useful for applications that require instant assessment of the particle
distribution.
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