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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2604.10340 |
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| _version_ | 1866910122075226112 |
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| author | Wahlstrand, J. K. Cruz, C. D. |
| author_facet | Wahlstrand, J. K. Cruz, C. D. |
| contents | Phase-sensitive pump-probe hyperspectral imaging is a precise technique for absolute two-beam measurements of the optical Kerr coefficient ($n_2$). The irradiance profile is characterized and background effects are 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 $n_2$ of a fused silica sample near 1 $μ$m wavelength and benchmarked against a measurement using Z-scan [Sheik-Bahae et al., IEEE J. Quantum Electron. 26, 760-769 (1990)], the most commonly used single-beam technique. Good agreement is found 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_10340 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Precise measurement of the Kerr coefficient using phase-sensitive pump-probe hyperspectral imaging Wahlstrand, J. K. Cruz, C. D. Optics Phase-sensitive pump-probe hyperspectral imaging is a precise technique for absolute two-beam measurements of the optical Kerr coefficient ($n_2$). The irradiance profile is characterized and background effects are 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 $n_2$ of a fused silica sample near 1 $μ$m wavelength and benchmarked against a measurement using Z-scan [Sheik-Bahae et al., IEEE J. Quantum Electron. 26, 760-769 (1990)], the most commonly used single-beam technique. Good agreement is found 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. |
| title | Precise measurement of the Kerr coefficient using phase-sensitive pump-probe hyperspectral imaging |
| topic | Optics |
| url | https://arxiv.org/abs/2604.10340 |