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Which of the following is a four-level laser? (a)ND: YAG

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Which of the following is a four-level laser?

(a) ND: YAG

(b) Ruby

(c) He-Ne

(d) Semiconductor laser

I had been asked this question by my college professor while I was bunking the class.

My question is based upon Pumping Mechanism topic in chapter Laser of Engineering Physics II

1 Answer

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The correct choice is (c) He-Ne

The best I can explain: He-Ne laser is a four-level laser. Whenever an electric discharge is passed through the gas, the helium atoms gets to higher energy states, as the concentration of helium atoms is higher to achieve population inversion.

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