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Accurately Measure Laser Spectral Characteristics

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Accurately Measure Laser Spectral Characteristics

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  • Author: Jeff Kondziela
Many different technologies can be used for spectral analysis, but the preferred method for highest-resolution spectral analysis is the scanning Fabry-Perot interferometer technique. As the Fabry-Perot interferometer is a very simple device that relies on the interference of multiple beams, it is ideal for measuring laser linewidth, longitudinal mode structure and frequency stability of a laser source. The device consists of two partially transmitting mirrors that are precisely aligned to form a reflective cavity. Incident light enters the Fabry-Perot cavity and undergoes multiple reflections between the mirrors so that the light can interfere with itself many times. If the frequency of the incident light is such that constructive interference occurs within the Fabry-Perot cavity, the light will be transmitted. Otherwise, destructive interference will not allow any light through the Fabry-Perot interferometer.

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