Laser diode
Laser diodes, also known as an injection lasers or diode lasers, are commonly used to provide coherent radiation in response to applied current. A laser diode is a semiconductor light-emitting element that has a light-emitting active region between a first end surface and a second end surface facing each other. A diode emits an output light beam with a spatial power distribution. Laser diodes span the optical spectrum from the near infra-red (IR) through the visible wavelengths. Laser diodes have been recognized as providing an efficient pump source in solid-state laser systems. When employed as a pump source, the laser diode is used to generate light which overlaps the spectral band of the laser medium. A laser diode pumped solid-state laser, which has a laser diode with higher absorption efficiency to a laser medium than a lamp and is small, highly efficient and has a long lifetime as a pumping light source. Diode-pumped solid-state lasers represent high power, compact light sources which have gained considerable significance as pumped-light sources due to the progress made in laser diode development. The laser diode generates a laser beam having frequency of a narrow width and keen directivity and is thus mainly used in a field such as optical communication, a multiple communication and a space communication. Semiconductor laser diodes have been used as a pumping light source for optical fiber amplifiers and as a signal light source in the fiber optic systems. In a laser diode module a laser beam from the semiconductor laser diode is optically coupled with an optical fiber. A laser diode module includes a peltier device in order to attain high power and stable operation. The laser diode module further includes a laser diode chip, a photo diode chip, optical components such as lenses, and electrical components such as a thermistor device or registers.
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