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// Chapter 2 addl_Example 6
//==============================================================================
clc;
clear;
//input data
h = 6.625*10^-34; // planck's constant
c = 3*10^8; // vel. of light in m/s
lamda = 5000*10^-10; // wavelength for optical region in m
T = 300 // Temperature in Kelvin
Kb = 1.38*10^-23 // Boltzmann constant
// Calculations
// let R = Rsp/Rst
R = exp((h*c)/(lamda*Kb*T)) - 1; // ratio of spontaneous to stimulated emission
if R<1 then
mprintf('Since the spontaneous emission is lesser than stimulated emission \n hence LASER action is possible at thermal equilibrium' )
else
mprintf('Since the spontaneous emission is more predominant than stimulated emission \n hence LASER action is not possible at optical frequencies under thermal equilibrium' )
end
//==============================================================================
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