Question

In ruby laser, the stimulated emission is due to transition from

• A. metastable state to any lower state
• B. any higher state to lower state
• C. metastable state to ground state
• D. any higher state to ground state

Hint:

Ruby laser emission = Metastable $\rightarrow$ Ground state.

Answer 1

The Correct Option is C

Step 1: Process
In a ruby laser, chromium atoms are excited to higher energy levels by a flash of light.
Step 2: Transition
These atoms drop to a metastable state before the laser action occurs.
Step 3: Conclusion
The stimulated emission that produces the laser light happens during the transition from this metastable state to the ground state.
Final Answer: (c)