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Second Harmonic Generation in Modal Phase-Matched Thin-Film Lithium Tantalate Ridge Waveguide
Xiuquan Zhang1, Haoyang Du2, Dawei Cao2
1Key Laboratory of Laser and Infrared System, Ministry of Education, Shandong University, Qingdao 266000, China.
Micromachines
|May 27, 2026
Summary
We achieved efficient and stable second-harmonic generation (SHG) using thin-film lithium tantalate (TFLT) waveguides. This method offers superior thermal stability for integrated nonlinear optics.
Area of Science:
- Nonlinear Optics
- Integrated Photonics
- Materials Science
Background:
- Second-harmonic generation (SHG) is crucial for frequency conversion.
- Thin-film lithium tantalate (TFLT) offers potential for integrated nonlinear devices.
- Achieving stable and efficient SHG in waveguides remains a challenge.
Purpose of the Study:
- To demonstrate efficient and thermally stable SHG in TFLT ridge waveguides.
- To explore modal phase matching (MPM) as a viable technique for TFLT.
- To assess the thermal stability of TFLT-based SHG devices.
Main Methods:
- Fabrication of x-cut TFLT ridge waveguides.
- Implementation of modal phase matching (MPM) for efficient nonlinear interaction.
- Experimental characterization of SHG performance and thermal stability.
Main Results:
- Achieved a normalized conversion efficiency (NCE) of 17.2% W⁻¹ cm⁻².
- Demonstrated exceptional thermal stability with a slope of 0.007 nm/°C.
- Showcased a two-orders-of-magnitude improvement in thermal stability compared to conventional devices.
Conclusions:
- MPM in TFLT is a promising strategy for integrated nonlinear optics.
- TFLT waveguides enable efficient on-chip frequency conversion without domain-poling.
- This technology is suitable for both classical and quantum light signal processing.
