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// Example No. 3.3
// To calculate the longitudinal mode spacing and the minimum gain required for laser oscillation
// Page no. 106
clc;
clear;
// Given data
c=3*10^8; // The speed of ligth in air
L=500*10^(-6); // The distance between mirrors
n=3.5; // The refractive index
inlossdB=50; // The internal loss in dB/cm
R1=0.3; // The reflectivity of ligth wave which is reflected at A
R2=0.3; // The reflectivity of ligth wave which is reflected at B
// The longitudinal mode spacing
deltaf=(c/(2*n*L))*10^-9; // The longitudinal mode spacing
L=0.05; // The distance between mirrors in cm
amir=(1/(2*L))*log(1/(R1*R2)); // The loss due to mirrors per cm
aint=log(10^(inlossdB/10)); // The coefficient of internal loss due to scattering
// The minimum gain required
g=aint+amir; // The minimum gain required for laser oscillation
// Displaying the result in command window
printf('\n The longitudinal mode spacing = %0.2f GHz',deltaf);
printf('\n The minimum gain required for laser oscillation per cm = %0.2f cm^-1',g);
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