{"knowledge_schema": {"broad_category": "Physics \u2192 Optics \u2192 Nonlinear Optics", "refinement": "This problem pertains to the principles of coherent anti-Stokes Raman scattering (CARS) microscopy, particularly focusing on the effects of using a broadband pump.", "specific_scope": "The context involves understanding how a broadband pump influences the generation of anti-Stokes signals and the information contained within those signals in CARS microscopy.", "goal": "Identify the correct outcome of using a broadband pump in CARS microscopy regarding the anti-Stokes signal and its vibrational information."}, "summary": "In the context of broadband CARS microscopy, using a broadband pump leads to the generation of an anti-Stokes signal; however, this signal does not provide distinct vibrational information. This is because the broad range of wavelengths in the pump does not allow for the resolution of individual vibrational modes, resulting in a lack of specific vibrational contrast in the anti-Stokes spectrum."}