Module 8 : Laser- II
Lecture   : Rate equations for Lasers
   Recap
   In this lecture you have learnt the following
Maser

Rate Equations for a Two Level System

Three Level Laser

Rate Equations for a Three Level System
Four Level Laser
Rate Equations for a Four Level System
Fabry - Perot Cavity and Laser Oscillation
Gain Saturation

Properties of Laser Beam

Spatial Coherence