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. Author manuscript; available in PMC: 2012 Sep 24.
Published in final edited form as: Nat Photonics. 2011 Jan 16;5(2):103–109. doi: 10.1038/nphoton.2010.294

Fig.1. Principle of stimulated Raman scattering (SRS).

Fig.1

a, Energy diagram of SRS. If the difference frequency of pump and Stokes beams is resonant with a molecular vibration, SRS occurs and a molecule of the sample is excited from its ground state to the vibrational excited state. b, As a consequence a pump photon of the excitation field is annihilated (stimulated Raman loss = SRL) and a Stokes photon is created (stimulated Raman gain = SRG) as required from energy conservation.