Super-resolution measurement of thermo-optic coefficient of KTP crystal based on phase amplification
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915194106544128 |
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| author | Li, Wuzhen Zhou, Zhiyuan Guo, Guangcan Shi, Baosen |
| author_facet | Li, Wuzhen Zhou, Zhiyuan Guo, Guangcan Shi, Baosen |
| contents | Given that the phase amplification method based on harmonic generation exhibits significant phase super-resolution capability in interferometric precision measurement, extending this technology to birefringence interferometers to achieve super-resolution characterization of birefringent crystal properties has important research significance and application value. Here, we achieve a four-fold enhancement in the measurement resolution of the thermo-optic coefficient of a KTiOPO4 crystal by combining a self-stabilized birefringence interferometer with cascaded second harmonic generation processes. We observe the tunable interference beating phenomenon by rotating a birefringent crystal versus the temperature of the crystal for the fundamental wave, second harmonic, and fourth harmonic. Furthermore, the fourth harmonic interference fringes beat 4 times faster than the fundamental wave interference fringes. This beating effect is used to determine the thermo-optic coefficients of the two principal refractive axes with a single measurement. This work provides a feasible, real-time, and robust method for super-resolution measurements based on birefringence interferometry. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_09023 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Super-resolution measurement of thermo-optic coefficient of KTP crystal based on phase amplification Li, Wuzhen Zhou, Zhiyuan Guo, Guangcan Shi, Baosen Optics Given that the phase amplification method based on harmonic generation exhibits significant phase super-resolution capability in interferometric precision measurement, extending this technology to birefringence interferometers to achieve super-resolution characterization of birefringent crystal properties has important research significance and application value. Here, we achieve a four-fold enhancement in the measurement resolution of the thermo-optic coefficient of a KTiOPO4 crystal by combining a self-stabilized birefringence interferometer with cascaded second harmonic generation processes. We observe the tunable interference beating phenomenon by rotating a birefringent crystal versus the temperature of the crystal for the fundamental wave, second harmonic, and fourth harmonic. Furthermore, the fourth harmonic interference fringes beat 4 times faster than the fundamental wave interference fringes. This beating effect is used to determine the thermo-optic coefficients of the two principal refractive axes with a single measurement. This work provides a feasible, real-time, and robust method for super-resolution measurements based on birefringence interferometry. |
| title | Super-resolution measurement of thermo-optic coefficient of KTP crystal based on phase amplification |
| topic | Optics |
| url | https://arxiv.org/abs/2503.09023 |