The early lasers all used ____ as the material that produced the laser light.
A) tungsten gas
B) a synthetic crystal rod
C) argon gas
D) a synthetic ruby rod

Name: The early lasers all used ____ as the material that produced the laser light. A) tungsten gas B) a synthetic crystal rod C) argon gas D) a synthetic ruby rod
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The first laser was demonstrated in 1960 using a synthetic ruby rod as the material that produced the laser light.

The Early Lasers All Used ____ as the Material That