Q. The population inversion necessary for laser action used in solid state lasers is
A) Electrical discharge
B) Inelastic atom-atom collisions
C) Direct conversion
D) Optical pumping
Explanation
(d) The population inversion required for laser action in solid state laser is optical pumping
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.