A laser diode, also known as an injection laser or diode laser, is a semiconductor device that produces coherent radiation (in which the waves are all at the same frequency and phase) in the visible or infrared (IR) spectrum when current passes through it.
This article is about the city in Jay County. For the city in Fountain County formerly named Portland, see Fountain, Indiana. Portland is a city in and the county seat of Jay County, Indiana, United States. The population was 6,223 at the 2010 census.
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