Posts tagged pumping source
As we have discussed in the previously, that principle of laser is stimulated emission and for it to take place, population inversion has to be achieved and maintained. For this, there must be a source of external energy, which can continuously supply energy to energy to laser medium, so that population inversion can be achieved. Such a source of external energy is called pump or pumping source and the process of supplying external energy to laser medium so as to achieve the population inversion is called pumping.
Next time we will discuss the various types of pumping source.
Three main components of laser device are:
a) Active medium:
For example in ruby laser, the active medium is aluminum oxide doped with .05 percent of chromium ions.
In helium -neon laser it is the combination of helium and neon in the ratio of 10 :1.
b) Pumping source:
For example in ruby laser, the pumping source is optical pumping that is helical xenon flash tube.
In helium-neon laser, electrical pumping that is electric discharge is used for stimulated absorption.
In most of the systems, it consists of system of two mirrors. On mirror is fully reflective and other is partially reflective.