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Stimulated Raman Scattering Spectroscopy

by oneilltn
Tags: raman, scattering, spectroscopy, stimulated
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Apr28-13, 09:03 PM
P: 2
Has anyone read or seen any articles that might highlight the techniques of Stimulated Raman Scattering Spectroscopy? Or just any knowledge on the process they would be able to share? I am having a tough time getting a hold on the process and if anyone has any useful information or articles that might lay it out a bit more clearly that would be very helpful. Thank you.
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Andy Resnick
Apr29-13, 07:56 AM
Sci Advisor
P: 5,539
Google returned 'About 427,000 results (0.24 seconds)', including numerous articles about the technique, for example:

and Bruker makes a line of instruments:

can you be more specific in what you are looking for?
Tony Campillo
Apr29-13, 10:06 AM
P: 4
Frankly, Stimulated Raman Spectrosocpy is not a useful spectroscopic tool. The line/vibration with the highest gain reaches threshold first, reduces the overall gain of other lines and so dominates the specta. So instead of seeing a spectral fingerprint of all lines and species present, the spectrum consists of a single line (or often other lines associated with Stokes and anti-Stokes features of the majority species). For example, suppose one wished to monitor impurities in ethanol with SRS. Generally what you would see is only the 2928 cm-1 feature associated with the majority species ethanol and no sign of impurities.

Consequently, spontaneous Raman scattering spectroscopy remains a popular tool yielding an easily obtained fingerprint of all vibrations/species present. Occasionally, some nonlinear approaches like CARS (Coherent Anti-Stokes Raman Spectrosocpy) are used in special cases (as for example, when background light levels are a problem, say in a flame).

The closest spectroscopy related to SRS is cw coherent Raman gain spectroscopy popularized by Owyoung in the 70's (see for example, ). It doesn't seem to be in use much nowadays, perhaps because of the need for several tunable lasers (too complex, expensive).

Tony Campillo
Apr29-13, 10:40 AM
P: 4
Stimulated Raman Scattering Spectroscopy

Here's some papers that may be interest that use femtosecond pulse technology to overcome the problem I described above. Technique is called impulsive SRS spectroscopy.
Apr29-13, 02:49 PM
P: 2
I am supposed to research this imaging method and give a short presentation on it for class and was looking to find any papers or articles that helped to lay out the process in a more basic manner, since I am having trouble comprehending the process. So anything that breaks down the method would be something helpful. Thanks for the help
Tony Campillo
Apr29-13, 03:53 PM
P: 4
There's quite a few SRS imaging papers that can be located using google. Several have pretty good diagrams showing schematically hown the imaging process works.

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