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Different experimental SRS configurations give access to different probing volumes. (a) Typical configuration for ISRS where the interaction volume of length 0.1–10 mm is formed by the intersecting pump and probe beams. (b) Microscope configuration where the incident beams are focused in collinear fashion with a high numerical aperture lens to a diffraction-limited interaction volume (~1 µm3). (c) Use of a nanoantenna to concentrate the incoming field to a nanoscopic volume (~1 nm3).
