This application note covers the theory and importance of laser linewidth measurements, especially as they relate to low-linewidth lasers.

Low linewidth lasers are important for use in systems such as coherent communications, fiber optic sensors, interferometric sensing and gas detection. Typically, linewidths vary greatly depending on the type of laser; they can be as large as tens of nanometers for powerful broadband dye lasers down to as low as a few Hz for lasers employing ultra-stable reference cavities.

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