Rami Arieli: " The
Laser Adventure" Chapter 2.3 page 2
Example 2.2: Absorption Coefficient
(a)
Calculate the absorption coefficient (a)
of materials which transmit 50% of the intensity of the incident radiation
on a 10 [mm] width, to the other side.
Solution to example 2.2:
Using the exponential absorption law:
a = 1/x * ln(1/T) = 1/1 * ln(1/0.5)
= 0.69 [cm-1]
Results from the exponential
absorption law:
-
For every material, absorption depends on the
width of the material. The thicker the material, less radiation
will be transmitted through.
-
For a certain width (x) of the material, absorption depends only on the
absorption
coefficient (a), which is characteristic of
each material.