(a) LASER is an abbreviation of a word string. Spell it out. (b) Explain the working principle of laser photon emission by using the concepts “population inversion”, “stimulated emission” and corresponding energy-band diagrams. (c) Write down the types of the LASERs you have learnt.
(a) LASER is an abbreviation of a word string. Spell it out. (b) Explain the working principle of laser photon emission by using the concepts “population inversion”, “stimulated emission” and corresponding energy-band diagrams. (c) Write down the types of the LASERs you have learnt.
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(a) LASER is an abbreviation of a word string. Spell it out. (b) Explain the working principle of laser photon emission by using the concepts “population inversion”, “stimulated emission” and corresponding energy-band diagrams. (c) Write down the types of the LASERs you have learnt.
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