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//Introduction to Fiber Optics by A. Ghatak and K. Thyagarajan, Cambridge, New Delhi, 1999
//Example 11.3
//OS=Windows XP sp3
//Scilab version 5.5.2
clc;
clear;
//given
R1=0.99;//reflection coefficient of mirror 1
R2=0.9;//reflection coefficient of mirror 2
l=10;//Distance between the two mirrors in cm
alpha=0;//average loss coefficient per unit length of resonator in cm^(-1)
Vth=alpha-log(R1*R2)/(2*l);//Corresponding threshold gain coefficient in cm^(-1)
mprintf("\n The threshold gain coefficient = %e cm^-1",Vth);//The answers vary due to round off error
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