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For an example, the first computer in the world, ENIAC, which occupied several rooms, is less powerful than the cheapest calculator today. It is obvious that if we can make products smaller without losing the features, we can save the cost and more » increase the performance dramatically. There are two major reasons that nanostructure is so fascinate. Recent years, more and more governments are investing huge amount of money in research related to nanotechnology. Most of modern electronic devices today should thanks to the miniaturizing driven by development of nanotechnology. It has become more and more important in recently years and has changed our world dramatically. Nanotechnology refers any technique that involves about object with nanoscale (10 -9 m) or even smaller. Data obtained with high power Nd:YAG lasers will be used as examples. We will focus on issues relevant to understanding and specifying a fiber-optic beam delivery system and provide guidelines for specifying a system. Harnessing the power of a high- power laser requires that knowledgeable and prudent choices be made when selecting the laser and its beam delivery system. Recent developments in optical materials allow manufacture of very low aberration optics useful for short focal length lenses in output optics. High-power handling requires high- quality fiber end-face finish and special connectors that can withstand back-reflections. The other components of the beam delivery system also impact performance. Selection of appropriate fiber type is important because the characteristics of the output beam enhance or degrade the utility of more » the fiber-optic-delivered beam for different applications. Smaller fibers tend to produce less degradation to beam quality but the minimum usable fiber size is limited by the quality of the laser beam, focusing optic, and the numerical aperture of the fiber. The fiber-optic beam delivery system effectiveness is strengthened by the optimal selection of its components not only for minimizing beam quality degradation but also for robustness. Multimode optical fibers enable efficient flexible laser beam delivery but at a loss in the quality of the delivered beam.