What is Hyper-Rayleigh and what is Hyper-Raman?

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Hyper-Rayleigh scattering involves frequency doubling from particles smaller than the light's wavelength, while Hyper-Raman scattering generates light at a frequency of 2w plus the phonon frequency (wp). There is uncertainty about whether Hyper-Rayleigh scattering produces a directional beam of second harmonic light with the same k-vector as the input, as some believe it is only diffuse. Hyper-Raman is essentially a second harmonic process, distinguishing it from standard Raman scattering. Both phenomena are significant in understanding light-matter interactions at a microscopic level.
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What is Hyper-Rayleigh and what is Hyper-Raman? Anyone know this?
 
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Well rayleigh scattering is the scattering off of particles which are small compared to the wavelength of light. Hyper-rayleigh refers to frequency doubling off of such particles. I don't know all the details - for example, whether you can consider there to be a directional beam of second harmonic light with the same k-vector as the input. This is one thing I'm unclear on - people seem to say that the hyper rayleigh scattering is only diffuse, but I'm not 100% convinced.

I assume hyper-Raman just means that you hit the sample with light at w, and create light at 2w+wp, where wp is the phonon frequency. I think the hyper just implies that it's second harmonic, otherwise it's a normal raman process.
 

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