Ruby laser has following uses or advantages or applications:

1. Ruby laser has very high output power of the order of 10⁴ – 10⁶ watts. It has wavelength of 6943 Angstroms.

2. Ruby lasers are used for holography, industrial cutting and welding.

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.