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+//Example 6.3
+//Program to calculate laser gain coefficient for the cavity
+
+clear;
+clc ;
+close ;
+
+//Given data
+L=600*10^-4;          //cm - CAVITY LENGTH
+r=0.3;                //*100 percent - REFLECTIVITY
+alpha_bar= 30;        //per cm - LOSSES
+
+//Laser Gain Coefficient
+gth_bar=alpha_bar+1/L*log(1/r);
+
+//Displaying the Result in Command Window
+printf("\n\n\t Laser Gain Coefficient is %1.0f per cm.",gth_bar);
+\ No newline at end of file