• 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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