Description of in-band relaxation?

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In summary, the conversation discusses the concept of in-band relaxation in laser engineering. The speaker's professor briefly mentioned it and the speaker is seeking a more thorough explanation. It is described as relaxation from two sub-levels of an upper electronic level of an atom/molecule. Another person suggests that it may refer to intraband relaxation in solids, where an electron-hole pair is excited away from the band edges and relaxes nonradiatively. This process is significant in determining linewidths in quantum well lasers. A resource is provided for further reading.
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What is in-band relaxation?
Hello all,

My professor was talking about in-band relaxation in my laser engineering class not long ago, although he didn't give a very thorough description of what exactly it was. Would someone mind explaining it to me? From what I gather it's probably relaxation from two sub-levels of an upper electronic level of an atom/molecule.

Thanks!
 
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Maybe he’s referring to intraband relaxation in solids, where an electron-hole pair is excited away from the band edges and relaxes nonradiatively. It’s an important process in determining linewidths in quantum well lasers. See for example:

https://ieeexplore.ieee.org/document/35228
 
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Thanks! That helps.
 

1. What is in-band relaxation?

In-band relaxation refers to the process by which a system or material returns to its equilibrium state after being perturbed or disturbed. It is a common phenomenon in many physical and chemical systems, where energy is released or dissipated to restore stability and balance.

2. How is in-band relaxation different from out-of-band relaxation?

In-band relaxation occurs within the same energy band or frequency range as the perturbation, while out-of-band relaxation occurs at a different energy level or frequency range. In other words, in-band relaxation involves energy being released or dissipated within the same system, while out-of-band relaxation involves energy being transferred to a different system.

3. What factors affect the rate of in-band relaxation?

The rate of in-band relaxation can be influenced by a variety of factors, including temperature, pressure, and the nature of the perturbation. For example, higher temperatures can increase the rate of relaxation, while stronger perturbations may result in a faster return to equilibrium.

4. How is in-band relaxation studied and measured?

In-band relaxation can be studied and measured using various techniques such as spectroscopy, microscopy, and relaxation experiments. These methods allow scientists to observe and analyze the changes in a system's energy levels and dynamics as it undergoes relaxation.

5. What are the applications of understanding in-band relaxation?

Understanding in-band relaxation is crucial in many fields of science, including physics, chemistry, and materials science. It can help us better understand the behavior of complex systems and develop new materials and technologies with desired properties. In-band relaxation is also essential in fields such as biophysics and medicine, where it plays a role in processes such as muscle contraction and nerve signaling.

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