# I Stimulated Raman in linear regime

1. May 19, 2017

### DrDu

In the course of another thread I was lend to think about the Raman effect. I also read about the stimulated Raman effect and found that it is usually described as a third order nonlinear effect where a power of two of E is assumed to drive the nuclear vibration. I don't quite see why this is necessary. If I shine two lasers whose energy difference $\Delta \omega=\Omega$ equals that of the frequency of the vibrational mode, I would expect to get stimulated Raman scattering also from the ordinary Stokes transition from the vibrational ground state to the first excited state. I also don't see a fundamental threshold for this process, so if light is shone into a sufficiently large volume of Raman active material, I would expect spontaneous lasing. Do you see some flaw in these lines of though?

2. May 24, 2017

### PF_Help_Bot

Thanks for the thread! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post? The more details the better.