![The population inversions in helium – laser is produced by?A) Photon excitation B) Chemical reaction C) Inelastic atomic collision D) Electron excitation The population inversions in helium – laser is produced by?A) Photon excitation B) Chemical reaction C) Inelastic atomic collision D) Electron excitation](https://www.vedantu.com/question-sets/055713b7-7078-4965-a16a-a3e4f9eaa47b8654722371149137664.png)
The population inversions in helium – laser is produced by?A) Photon excitation B) Chemical reaction C) Inelastic atomic collision D) Electron excitation
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What is Laser Diode, Working, Features, Types, Definition & Applications - The Engineering Knowledge
![SOLVED: What is a population inversion in a laser? Population inversion is a state where there is the same number of electrons in excited and ground states of a lasing transition: Population SOLVED: What is a population inversion in a laser? Population inversion is a state where there is the same number of electrons in excited and ground states of a lasing transition: Population](https://cdn.numerade.com/ask_images/016667404b1243a79535054f93f57639.jpg)