Description of in-band relaxation?

[mksiver]

TL;DR

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!

 

[TeethWhitener]

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

 

[mksiver]

Thanks! That helps.