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.