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Single-Mode vs Multimode Fabry-Perot Laser Diodes

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Single-Mode vs Multimode Fabry-Perot Laser Diodes

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  • Author: Mike McGoff
FP lasers are edge-emitting devices, and the basis for their operation is the laser resonator cavity known as a Fabry-Perot resonator. A Fabry-Perot resonator is a cavity with two mirrors. The front and back facet of the laser diode serve as the mirrors. Only the photons with a frequency of the resonant mode can travel in the cavity. These photons are reflected back and forth between the two facets and amplified by the semiconductor gain medium inside the cavity. In the fabrication of laser devices, highly efficient reflections may be achieved by applying a combination of a high-reflector coating on one end and an antireflective- coating on the other end. The laser beam is emitted from the antireflective coated edge.

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