Which of the following is not a type of laser | vedclass

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Question

(A) laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation.
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Vedclass · Accepted Answer

Hydrogen laser

Vedclass · Answer

(A) laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation.
Common types of lasers include gas lasers like $CO_2$ lasers,Helium-Neon (He-Ne) lasers,and Argon ion lasers.
Hydrogen gas is not typically used as a lasing medium in standard laser technology because its energy level structure does not support the population inversion required for continuous laser action in the same way as noble gases or $CO_2$ molecules.
Therefore,a Hydrogen laser is not a standard type of laser.

Which of the following is not a type of laser?

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