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//Example 2.12
//Program to determine relative refractive index difference using ESI
//technique
clear;
clc ;
close ;
//Given data
lambda_c=1.19*10^(-6); //metre - CUTOFF WAVELENGTH
w0=5.2*10^(-6); //metre - SPOT SIZE
n1=1.485; //MAXIMUM REFRACTIVE INDEX OF THE CORE
// The ESI core diameter
d_ESI=1.820*w0;
// The ESI relative index difference
delta_ESI=(0.293/n1^2)*(lambda_c/d_ESI)^2;
//Displaying the Result in Command Window
printf("\n\n\t The relative refractive index difference using ESI technique is %0.2f percent.",delta_ESI*10^2);
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