ABSTRACT
This chapter explains the solar-energy-pumped laser, which converts sunlight into laser energy. The most familiar examples of its use would be CDs, DVDs, and laser disk players and recorders, including Blu-ray. By focusing a laser into an extremely small place, it becomes possible to read data that are recorded over a small area. The optical communication used for accessing the Internet is an applied example of lasers. Laser light is transmitted in a transparent optical fiber at the speed of light. Sunlight also consists of various lights. It includes many wavelengths, from red to violet as visible rays, infrared rays, and ultraviolet rays. To describe the advantage of laser in a word, it can concentrate energy in space and time. It brings light with the same wavelength to the same timing, and the light can be concentrated at a very small area.
