Gould, R. Gordon (1959). "The LASER, Light Amplification by Stimulated Emission of Radiation". in Franken, P.A. and Sands, R.H. (Eds.). The Ann Arbor Conference on Optical Pumping, the University of Michigan,
4828LASER Part II : หลักการเกิดแสงเลเซอร์/article/item/4828-laser-part-ii
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