Last updated on 01/31/2023
A pump laser diode is a type of laser diode that is used to inject energy into a solid-state laser/amplifier to create an optical gain. It acts as the energy source for the laser/amplifier and is typically designed to operate in a continuous wave (CW) mode at high power levels. The output from the pump laser diode is launched into the gain medium of the laser, where it excites the atoms or ions to produce laser light.
When used for pumping a fiber laser and fiber amplifier, the pump laser diodes are typically fiber coupled such that the pump energy can be easily launched to the gain fiber by fusion splicing.