Which of the following was the first working laser?
1. Disk laser
2. Ruby laser
3. Carbon dioxide laser
4. Argon – ion laser
1. Disk laser
2. Ruby laser
3. Carbon dioxide laser
4. Argon – ion laser
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Correct Answer – Option 2 : Ruby laser
First working model of laser based on the theoretical principles was made in 1960 by shining a high power flash lamp on a ruby rod with silver coated surfaces.