Question

describe the importance of the metastable state in achieving the population inversion in LASER.​

Answer 1

Answer:

In a three-level laser, the material is first excited to a short-lived high-energy state that spontaneously drops to a somewhat lower-energy state with an unusually long lifetime, called a metastable state. The metastable state is important because it traps and holds the excitation energy, building up a…