Compact blue laser devices
William P. Risk
For the first several years of its existence, the laser was said to be a solution in search of a problem. Now, three decades after the demonstration of the first laser, practical applications are driving the development of new types of lasers. Several applications of current interest require compart sources of blue or green light. Optical data storage (where the short wavelength provides high storage density), undersea communications (where the blue light passes more easily through seawater), and large-screen displays (where blue and green are needed to make a full-color display) are a few examples of applications for which the development of small blue laser devices is considered important.
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