Efficient and tunable frequency conversion using periodically poled thin-film lithium tantalate nanowaveguides
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866913822725373952 |
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| author | Yu, Simin Qi, Mingyue Zhu, Huizong Zhao, Bofu Qian, Jingchun Chen, Qiushi Lu, Juanjuan |
| author_facet | Yu, Simin Qi, Mingyue Zhu, Huizong Zhao, Bofu Qian, Jingchun Chen, Qiushi Lu, Juanjuan |
| contents | Thin-film lithium tantalate (TFLT) has recently emerged as a promising photonic platform for chip-scale nonlinear optics due to its weaker photorefraction, higher optical damage threshold, broader transparency window, and lower birefringence compared to that of thin-film lithium niobate. Here we develop an ultralow-loss lithium tantalate integrated photonic platform and report the first functional second harmonic generator based on high-fidelity poling of z-cut TFLT. As a result, quasi-phase matching (QPM) is performed between telecom (1550 nm) and near-visible (775 nm) wavelengths in a straight waveguide and prompts strong second-harmonic generation with a normalized efficiency of 229 %/W/$cm^2$. An absolute conversion efficiency of 5.5 % is achieved with a pump power of 700 mW. Such a second-harmonic generator exhibits stable temperature tunability (-0.44 nm/$^\circ C$) which is important for applications that require precise frequency alignment such as atomic clocks and quantum frequency conversion. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_03162 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Efficient and tunable frequency conversion using periodically poled thin-film lithium tantalate nanowaveguides Yu, Simin Qi, Mingyue Zhu, Huizong Zhao, Bofu Qian, Jingchun Chen, Qiushi Lu, Juanjuan Optics Thin-film lithium tantalate (TFLT) has recently emerged as a promising photonic platform for chip-scale nonlinear optics due to its weaker photorefraction, higher optical damage threshold, broader transparency window, and lower birefringence compared to that of thin-film lithium niobate. Here we develop an ultralow-loss lithium tantalate integrated photonic platform and report the first functional second harmonic generator based on high-fidelity poling of z-cut TFLT. As a result, quasi-phase matching (QPM) is performed between telecom (1550 nm) and near-visible (775 nm) wavelengths in a straight waveguide and prompts strong second-harmonic generation with a normalized efficiency of 229 %/W/$cm^2$. An absolute conversion efficiency of 5.5 % is achieved with a pump power of 700 mW. Such a second-harmonic generator exhibits stable temperature tunability (-0.44 nm/$^\circ C$) which is important for applications that require precise frequency alignment such as atomic clocks and quantum frequency conversion. |
| title | Efficient and tunable frequency conversion using periodically poled thin-film lithium tantalate nanowaveguides |
| topic | Optics |
| url | https://arxiv.org/abs/2505.03162 |