The world's first laser patented by American physicist Theodore Maiman in 1967.
https://diqn32j8nouaz.cloudfront.net...1_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net...r_fullsize.jpg
Previously:
https://www.homemadetools.net/forum/...188#post121171
https://www.homemadetools.net/forum/...2374#post96156
https://www.homemadetools.net/forum/...743#post152108
https://www.homemadetools.net/forum/...701#post163222
https://www.homemadetools.net/forum/...429#post173591
