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
D. Carbon dioxide gas
Answer: Option C
Solution(By Examveda Team)
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.This Question Belongs to General Knowledge >> Technology
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