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+//clear//
+//Caption:Calcualtion of number of half-wavelengths and wavelength spacing between lasing modes
+//Example4.9
+//page161
+clear;
+clc;
+close;
+Lambda = 900e-09;// wavelength of ligth emitted by laser dioda
+L = 300e-06;// length of laser chip
+n = 4.3; //refractive index of the laser material
+m = 2*L*n/Lambda;//number of half-wavelengths
+delta_Lambda = (Lambda^2)/(2*L*n);//wavelength spacing
+disp(m,'number of half-wavelengths spanning the region between mirror surfaces')
+disp(delta_Lambda,'spacing between lasing modes is')
+//Result
+//number of half-wavelengths spanning the region between mirror surfaces    2866.6667  
+//spacing between lasing modes is   3.140D-10