Question

explain concept of negative temperature in connection with the operation of laser​

Answer 1

Answer:

For laser action, there should be more number of atoms in higher energy state. Artificially creating more number of atoms in a higher energy states than the lower energy state is called population inversion. ... Therefore, population inversion is known as state of negative temperature.

Answer 2

Concept of negative temperature in connection with the operation of laser:

• Thermodynamics and Statistical mechanics at Negative Absolute Temperature. The Kelvin scale is expressed 0 K, absolute zero point and the motion in a classical gas would stop.
• System temperatures is to be expressed  positive. In the systems, the temperature is to be defined in terms of Boltzmann's entropy can become negative.
• A laser mostly emits the light by the process of optical amplification based on  electromagnetic radiation emission. The negative temperature are very stable, lower motional energy.

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