Question

The method of population inversion to the laser action in He-Ne laser is
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Answer 1

Answer:

In order to achieve population inversion, we need to supply energy to the gain medium. In helium-neon lasers, we use high voltage DC as the pump source. A high voltage DC produces energetic electrons that travel through the gas mixture. The gas mixture in helium-neon laser is mostly comprised of helium atoms.

Answer 2

The correct answer is that we need to supply energy to the gain medium.

• To achieve population inversion, we must provide energy to the gain medium. The pump source in helium-neon lasers is high voltage DC.
• A high voltage direct current (DC) generates energetic electrons that travel through the gas mixture.
• The first continuous wave (CW) laser ever built was the helium-neon laser. Ali Javan, Bennett, and Herriott of Bell Telephone Laboratories created it in 1961.
• The most common gas lasers are helium-neon lasers. These lasers have numerous industrial and scientific applications and are frequently used in optical laboratory demonstrations.
• The optical pumping method is not used in He-Ne lasers; instead, an electrical pumping method is used.

Hence, energy should be supplied to gain medium.

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