Day: January 9, 2011


Types of laser

The lasers can be classified on the basis of state as explained below: a)      State of laser medium: According to the state of laser medium,


Metastable State

It is also the excited state but having life time of 10-5 to 10-3 seconds. Population inversion occurs only in between the metastable state and


Population Inversion in Lasers

Normally the population density of atoms/electrons is more in the ground state than the excited state. But if the process of stimulated emission dominates over

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