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//Example 6.2
//Program to determine the number of longitudinal modes and their
//frequency separation in a ruby laser
clear;
clc ;
close ;
//Given data
Lambda=0.55*10^-6; //metres - PEAK EMISSION WAVELENGTH
n=1.78; //REFRACTIVE INDEX
c= 2.998*10^8; //m/s - SPEED OF LIGHT
L=4*10^(-2); //metres - CRYSTAL LENGTH
//Number of Longitudinal modes
q=2*n*L/Lambda;
//Frequency separation of the modes
del_f=c/(2*n*L);
//Displaying the Results in Command Window
printf("\n\n\t Number of Longitudinal modes is %0.1f X 10^5.",q/10^5);
printf("\n\n\t Frequency separation of the modes is %0.1f GHz.",del_f/10^9);
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