What is the need to achieve population inversion?
A. To excite most of the atoms
B. To bring most of the atoms to ground state
C. To achieve stable condition
D. To reduce the time of production of laser
Answer:A
What is the need to achieve population inversion?
A. To excite most of the atoms B. To bring most of the atoms to ground state C. To achieve stable condition D. To reduce the time of production of laser