Definition
The efficiency of absorption of pumping energy in the fiber is an important parameter of a double-clad fiber laser. In many cases this efficiency can be approximated with
where
- is the cross-sectional area of the cladding
- is the radius of the core (which is taken to be circular)
- is the absorption coefficient of pump light in the core
- is the length of the double-clad fiber, and
- is a dimensionless adjusting parameter, which is sometimes called the "filling factor"; .
The filling factor may depend on the initial distribution of the pump light, the shape of the cladding, and the position of the core within it.
Read more about this topic: Filling Factor
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