Helium neon laser is better than ruby laser or most of the four level lasers are better than three level lasers due to the following reasons:
- The laser output is continuous in the case of helium-neon laser. But it is in the form of pulse in the ruby laser.
- Ruby laser requires high power pumping source, whereas Helium-neon laser requires low power pumping source like electric discharge.
- Efficiency of helium-neon laser is more than ruby laser.
- The defects due to crystalline imperfections are also present in the ruby laser. But it is not so in the helium-neon laser.
Reference: This article is referred from my authored book “optics and lasers” having ISBN 81-272-2948-2. In case of any doubt, post in the comment section.
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