When it comes to synonyms for the term "laser diode", there are a number of suitable alternatives. For example, the term "semiconductor laser" is often used to describe this type of device, as it relies on the properties of semiconductor materials in order to produce light. Other potential synonyms for "laser diode" might include "solid-state laser", which again reflects the underlying materials used to construct the device, or simply "laser", which could be used as a more general term to refer to any type of device that produces coherent light. Ultimately, the choice of synonym will depend on the specific context in which the term is being used, as well as the preferences of the writer or speaker involved.