What are the main parts of a laser?
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Lasers consist of three main components: a lasing medium (solid, liquid or gas), a stimulating energy source (pump) and an optical resonator.
The critical components of a laser are a gain medium, a pump source, and a resonator. Table 1 lists the primary functions of these components as well as typical examples while Figure 1 illustrates these components in an operational laser. Table 1. Function and examples for the three components of lasers.