Both natural and artificial light are used for optics. For example, for outdoor photography, natural lighting is often the choice. Other applications require artificial lighting. Artificial lighting sources that are often used in optical apparatus are
• Incandescent or halogen light—Applications include room lighting, photography, microscopy, and spectroscopy.
• Light emitting diodes—Applications include efficient room lighting, photography, computer screens, microscopy, and spectroscopy.
• Laser diodes—Applications include communication, laser pointers, sensing, laser printers, and CD and DVD players. High-power lasers are used as a pump source for a pulsed power lasers and for optical fiber amplifiers.
• Gas lasers—Applications ...
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