Thought I would share my find this morning. Found it interesting.
https://www.flickr.com/photos/134206782@N05/19055199325/in/photostream/
https://course.ie.cuhk.edu.hk/~ierg4030/Lecture/the_first_ruby_laser.pdf
https://en.wikipedia.org/?title=Maser
Great Book about the Laser patent wars as well..
Laser: The Inventor, the Nobel Laureate, and the Thirty-Year Patent War
By Nick Taylor