Q67
What was the active medium used in the first working laser ever constructed?
A.
A diamond block
B.
Helium-neon gas
C.
A ruby rod
AnswerD.
Carbon dioxide gas
Answer: Option C
Solution
Answer: Option C
Solution:
Theodore Maiman built the first working laser using a ruby rod while working at Hughes Research Laboratories in Malibu, California. It lased for the first time on May 16, 1960.