A Description of in-band relaxation?

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In-band relaxation refers to the process where an electron-hole pair, excited within a solid's electronic band structure, relaxes nonradiatively after being excited away from the band edges. This phenomenon is crucial for understanding linewidths in quantum well lasers, as it affects the efficiency and performance of these devices. The discussion highlights the importance of this relaxation process in laser engineering and its implications for material properties. Further reading on the topic can be found in relevant academic literature. Understanding in-band relaxation is essential for advancements in laser technology.
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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
 
Thanks! That helps.
 

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