Maiman's laser used a ruby crystal doped with chromium ions. When exposed to intense light from a flash lamp, the chromium ions were excited to higher energy levels. They then emitted photons, which stimulated the emission of more photons, leading to the amplification of light and the production of a coherent laser beam.
What was the active medium used in the first working laser ever constructed ?
Asked in OPSC CS Prelims 2021 · Topic: Optics (Laser: Principles and applications)
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