Correlation-resolved sum-frequency generation microscopy of biological tissue with bright twin beams

Twin-beam correlations in mouse skeletal muscle enable coherent-component SFG images with a Bragg-spot-to-background ratio of approximately 310, versus 7.5 for the incoherent component.

• Why it matters: It is unclear whether modal correlations that boost coherent SFG in anisotropic nonlinear media also improve imaging contrast in heterogeneous biological tissue.
• What they did: The study performs SFG microscopy of biological tissue with bright twin beams, using spectral decomposition to separate coherent and incoherent signal components and reconstruct co-registered images.
• The result: In fresh human dermis, the coherent component shows greater Fourier power in the 0.30–0.50 μm⁻¹ band and a greater fractional autocovariance decay at short spatial lags, indicating improved detectability at selected spatial frequencies.

AI summary of the abstract · may contain errors · not medical advice · read the paper.