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Photonics
Volume 13
Issue 6
10.3390/photonics13060570
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Quasi-Phase-Matched Thin-Film Lithium Tantalate Waveguides for On-Chip Fourth-Harmonic Generation Toward the Ultraviolet

by
Jie Yang
1,
Yulin Shen
1,
Mingzhe Li
2,
Yi Zhang
1,
Ke Zhang
1,
Dehui Pan
1,
Jiahui Yao
1 and
Ming Xin
1,3,*
1
School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
2
Sinopec Matrix Corporation, Qingdao 266000, China
3
Tianjin Key Laboratory of Brain-Inspired Intelligence Technology, Tianjin 300072, China
*
Author to whom correspondence should be addressed.
Photonics 2026, 13(6), 570; https://doi.org/10.3390/photonics13060570
Submission received: 3 May 2026 / Revised: 1 June 2026 / Accepted: 4 June 2026 / Published: 10 June 2026
(This article belongs to the Special Issue New Perspectives in Laser Nonlinearity: Phenomena, Theory, and Breakthroughs)
Review Reports Versions Notes

Abstract

Thin-film lithium tantalate (LiTaO3) is a promising platform for integrated nonlinear photonics owing to its strong second-order nonlinearity, broad transparency window, and favorable photorefractive resistance. Here, we numerically investigate cascaded fourth-harmonic generation in quasi-phase-matched thin-film LiTaO3 waveguides, targeting ultraviolet generation at 387.5 nm from a 1550 nm pump. Three poling schemes, including square-wave periodic poling, generalized quasi-periodic superlattice (GQPS), and dual-period poling (DPP), are designed to simultaneously compensate the phase mismatch of second-harmonic generation and fourth-harmonic generation. Under a 10 mW average input power and 250 fs pulse duration, the simulated fourth-harmonic conversion efficiencies reach 42.7%, 35.7%, and 57.1%, respectively. The DPP structure provides the highest efficiency by supporting both nonlinear processes with relatively strong low-order reciprocal–vector components. The influence of waveguide geometry errors and temperature tuning is further analyzed, showing that the fourth-harmonic process is more temperature-sensitive than the second-harmonic process. In addition, the feasibility of extending this scheme toward 300 nm deep-ultraviolet generation is discussed. These results provide a design route for compact, efficient, and fabrication-compatible on-chip ultraviolet sources based on thin-film LiTaO3 nonlinear photonics.
Keywords: thin-film lithium tantalate; fourth-harmonic generation; quasi-phase matching; nonlinear integrated photonics thin-film lithium tantalate; fourth-harmonic generation; quasi-phase matching; nonlinear integrated photonics

Share and Cite

MDPI and ACS Style

Yang, J.; Shen, Y.; Li, M.; Zhang, Y.; Zhang, K.; Pan, D.; Yao, J.; Xin, M. Quasi-Phase-Matched Thin-Film Lithium Tantalate Waveguides for On-Chip Fourth-Harmonic Generation Toward the Ultraviolet. Photonics 2026, 13, 570. https://doi.org/10.3390/photonics13060570

AMA Style

Yang J, Shen Y, Li M, Zhang Y, Zhang K, Pan D, Yao J, Xin M. Quasi-Phase-Matched Thin-Film Lithium Tantalate Waveguides for On-Chip Fourth-Harmonic Generation Toward the Ultraviolet. Photonics. 2026; 13(6):570. https://doi.org/10.3390/photonics13060570

Chicago/Turabian Style

Yang, Jie, Yulin Shen, Mingzhe Li, Yi Zhang, Ke Zhang, Dehui Pan, Jiahui Yao, and Ming Xin. 2026. "Quasi-Phase-Matched Thin-Film Lithium Tantalate Waveguides for On-Chip Fourth-Harmonic Generation Toward the Ultraviolet" Photonics 13, no. 6: 570. https://doi.org/10.3390/photonics13060570

APA Style

Yang, J., Shen, Y., Li, M., Zhang, Y., Zhang, K., Pan, D., Yao, J., & Xin, M. (2026). Quasi-Phase-Matched Thin-Film Lithium Tantalate Waveguides for On-Chip Fourth-Harmonic Generation Toward the Ultraviolet. Photonics, 13(6), 570. https://doi.org/10.3390/photonics13060570

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