Question

What are the condition for achieve population
inversion?
Select one:
a. N1-N2
b. N1> N2
C. N1 < N2​

Answer 1

Answer:

a. N1-N2 is the answer

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Answer 2

Answer:

c

Explanation:

A population inversion (N2 > N1 ) has thus been achieved between level 1 and 2, and optical amplification at the frequency ν21 can be obtained. Because at least half the population of atoms must be excited from the ground state to obtain a population inversion, the laser medium must be very strongly pumped