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| Main Author: | |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2604.05444 |
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| _version_ | 1866913009532665856 |
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| author | Meril, Eli |
| author_facet | Meril, Eli |
| contents | We investigate mode conversion of $\mathrm{TEM}_{00}$ Gaussian beams upon transmission through planar dielectric interfaces. We show that the angle-dependent Fresnel coefficients act as a spatial filter, inevitably generating higher-order spatial modes. Using a vector angular spectrum formulation and numerical simulations, we reveal that this polarization-dependent filtering induces a coupling from $\mathrm{TEM}_{00}$ into higher-order Laguerre-Gaussian modes, yielding a quadrupolar field pattern. We quantify the associated amplitude and phase deviations, showing that the mode fidelity decreases significantly as the beam waist approaches the diffraction limit. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_05444 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Mode Conversion of Gaussian Beams at Dielectric Interfaces Meril, Eli Optics We investigate mode conversion of $\mathrm{TEM}_{00}$ Gaussian beams upon transmission through planar dielectric interfaces. We show that the angle-dependent Fresnel coefficients act as a spatial filter, inevitably generating higher-order spatial modes. Using a vector angular spectrum formulation and numerical simulations, we reveal that this polarization-dependent filtering induces a coupling from $\mathrm{TEM}_{00}$ into higher-order Laguerre-Gaussian modes, yielding a quadrupolar field pattern. We quantify the associated amplitude and phase deviations, showing that the mode fidelity decreases significantly as the beam waist approaches the diffraction limit. |
| title | Mode Conversion of Gaussian Beams at Dielectric Interfaces |
| topic | Optics |
| url | https://arxiv.org/abs/2604.05444 |