the material used as the active medium determines
LASER wavelength
preferred pumping methode
order of magnitude of the laser output
the efficiency of the laser system
We saw that the tow basic requirements for laser action are
population Inversion between the upper and lower laser energy levels
Tte active medium must be transparent to the output wavelenght
The active medium determines most of the laser properties, and that is why the laser name is derived from the name of the active medium
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