Question

5. Explaim if two level LASER is feasible (starting
negative temperature conditions, write down
threshold candition for LASER braduction
Answer →​

Answer 1

It is theoretically possible for a two-level laser to operate at negative temperatures.

• Still, the threshold conditions for lasing (the process by which a laser produces coherent light) may be difficult to achieve.
• For lasing to occur, the population inversion (the number of atoms in an excited state versus the number in a lower energy state) must be sufficient to allow for the stimulated emission of photons.
• At negative temperatures, population inversion may be more difficult to achieve because the atoms are more likely to be in their ground state.
  Additionally, the threshold condition for lasing requires that the laser material's gain (amplification of the light) exceeds the loss (attenuation of the light).
• This can be difficult to achieve at negative temperatures because light absorption is typically higher at lower temperatures, leading to increased loss.
• Overall, while it is possible for a two-level laser to operate at negative temperatures, it may be challenging to achieve the necessary threshold conditions for lasing.

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