Methods and systems of laser-induced image technology and ways of their development are discussed. The methods depend on kind of laser-induced etch points (marks), which are used for image creation. Today, the marks, which are usually used for this purpose, are laser-induced damages which are a result of breakdown phenomena. Corresponding systems comprise the following subsystems: A) laser system for generating laser-induced damages inside a transparent material so as the exterior light scattered from them has low fluctuations; B) computer graphic system for transformation of an image into arrangement of points at which breakdowns should be produced; C) systems for controlling characteristics of laser-induced images including the number of gray shades, image resolution, color deviation and so on; D) systems for controlling parameters of laser radiation including direction of laser beam. The methods and systems for increasing quality of such images are discussed. However, there are also other marks appearing as a result of photo ionization and of other physical phenomenon, accompanying interaction of power laser radiation with transparent material. The use of these marks opens new opportunities for creation of laser-induced images with special characteristics. These opportunities are also subject of our discussion.
Several methods for creating color laser-induced images are discussed. The first group of the methods is based on the creation of laser-induced damages with specific space shapes so as they lay out white light into spectrum. The second group is based on the creation of the color centers. The third group uses special types of transparent materials like photosensitive glass.
Creation of laser-induced images within transparent materials is discussed. The special attention is attended to creating 2D and 3D laser-induced portraits. Method producing 3D laser-induced portrait by using two 2D portraits is examined.
Creation of small laser-induced damages without large star structure is discussed. The method for producing laser- induced damages by the specific temporal radiation is reported. Particularly, the laser system for production images inside transparent material by generating succession of plenty pairs of pulses is described.
The purpose of the paper is to transfer the experience of production of laser-induced damage images. At the beginning the specific system for production of the images is shown and characteristics of all elements of the system are described. General steps of creation of laser-induced damage images are discussed in detail and they are illustrated by numerous examples.
Creation of laser-induced damage imags inside transparent materials is one of the technical and art applications of laser induced damage phenomena. The purpose of the paper is to present the laser induced damage image technology and to discus problems of the optimization of the system producing the images. At the beginning a brief historical overview and patent situation are presented. An exemplary block-diagram of laser etching system for simultaneous production of several images inside several articles is shown and some peculiarities due to specific formation of laser induced micro-damages are discussed. Several methods for generating 3D images and portraits allowing reproduction of them within an optically transparent materials with the same resolution like computer processed images, without sharp to point structure and without significant fluctuations of gray shades are disclosed. Technique of image reproduction without undesirable regular arrangement of etch points is presented.
Taking into account the current research results of the probabilistic model describing the laser Doppler flowmetry signal, the probability-density function is derived and the potential attainable in the measurements of the unknown parameters in the laser Doppler flowmetry accuracy is analyzed.
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