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Efficient and tunable frequency conversion using periodically poled thin-film lithium tantalate nanowaveguides.

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Názov: Efficient and tunable frequency conversion using periodically poled thin-film lithium tantalate nanowaveguides.
Autori: Yu, Simin, Qi, Mingyue, Zhu, Huizong, Zhao, Bofu, Qian, Jingchun, Wu, Yiqun, Chen, Qiushi, Lu, Juanjuan
Zdroj: Nanophotonics (21928606); Sep2025, Vol. 14 Issue 18, p3017-3022, 6p
Predmety: SECOND harmonic generation, OPTICAL waveguides, OPTICAL films, FREQUENCY changers, OPTICAL properties, OPTICAL wavelength conversion
Abstrakt: 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 report the first functional second harmonic generator achieved through high-fidelity poling of z-cut TFLT waveguides, based on a low-loss lithium tantalate integrated photonic platform. As a result, quasi-phase matching is performed between telecom (1,550 nm) and near-visible (775 nm) wavelengths in a straight waveguide and prompts strong second-harmonic generation with a normalized efficiency of 229 %/(W·cm2). An absolute conversion efficiency of 5.5 % is achieved with a pump power of 700 mW in the waveguide. Such a second-harmonic generator exhibits stable temperature tunability (−0.44 nm/°C), which is important for applications that require precise frequency alignment such as atomic clocks and quantum frequency conversion. [ABSTRACT FROM AUTHOR]
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Abstrakt: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 report the first functional second harmonic generator achieved through high-fidelity poling of z-cut TFLT waveguides, based on a low-loss lithium tantalate integrated photonic platform. As a result, quasi-phase matching is performed between telecom (1,550 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<sup>2</sup>). An absolute conversion efficiency of 5.5 % is achieved with a pump power of 700 mW in the waveguide. Such a second-harmonic generator exhibits stable temperature tunability (−0.44 nm/°C), which is important for applications that require precise frequency alignment such as atomic clocks and quantum frequency conversion. [ABSTRACT FROM AUTHOR]
ISSN:21928606
DOI:10.1515/nanoph-2025-0201