ArticleThe Review of scientific instruments2026
Precise measurement of the Kerr coefficient using phase-sensitive pump-probe hyperspectral imaging.
Article in The Review of scientific instruments, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Phase-sensitive pump-probe hyperspectral imaging is a precise technique for absolute two-beam measurements of the optical Kerr coefficient (n2). The irradiance profile is characterized and background effects rejected by rastering the pump beam across the probe beam to yield a complex-valued hyperspectral image of the pump-induced nonlinear response. Information about the temporal irradiance profile is carried in the spectral response. The technique is demonstrated by measuring n2 of a fused silica sample near a 1 μm wavelength and benchmarked against a measurement using Z-scan [M. Sheik-Bahae et al., IEEE J. Quantum Electron. 26, 760-769 (1990)], the most widely used single-beam technique. The two measurements are consistent when the two-beam grating effect from the Raman contribution to the nonlinearity is considered. Uncertainty contributions are described in detail, and the outlook is discussed for improvements in precision.
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