Laser action is due to the neon atoms. Helium is used for selective pumping of neon atoms to upper energy levels. Two electrodes are fixed near the ends of the tube to pass electric discharge through the gas. Two optically plane mirrors areanbsp;...
|Title||:||Engineering Physics I: For WBUT|
|Author||:||Naidu S. Mani|
|Publisher||:||Pearson Education India -|