Semiconductor-based light sources such as light-emitting diodes (LED) and laser diodes have revolutionized the application of photonic components in science, engineering, and technology. They have become ubiquitous components and are found in most places, be it markets where they are used as scanners for products, at home where they are found in CD and DVD readers or laser printers, in communication systems as sources, etc. Unlike the lasers discussed earlier, laser diodes are based on semiconductors such as gallium arsenide (GaAs), gallium indium arsenide (GaInAs), gallium nitride (GaN), etc. They cover the range of wavelengths from the blue region to the infrared.
KeywordsConduction Band Valence Band Joint Density Gain Coefficient Laser Oscillation
- Saha, M. N., and Srivastava, B. N. (1973), Treatise on Heat, 5th Edition. The Indian Press Pvt. Ltd. Allahabad.Google Scholar
- Yariv, A. (1977), Optical Electronics in Modern Communications, 5th Edition, Oxford University Press.Google Scholar
- Ghatak, A., and Thyagarajan, K. (1998), Introduction to Fiber Optics. Cambridge University Press, UK.Google Scholar