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arXiv · 2602.00695

On-Chip Erbium-Doped Tantalum Oxide Microring Hybrid Cavity Single-Mode Laser

Like Shui·Ruixuan Yi·Chenyang Zhao·Jinlong Lu·Xiaotong Zhang·Jiaqiao Zhang·Xuetao Gan
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Abstract

We demonstrate a high-performance, single-mode Er:Ta2O5 microring laser monolithically integrated on a silicon platform via a customized Damascene process. The Er:Ta2O5 gain medium exhibits a low propagation loss of 0.73 dB/cm and a high intrinsic Q-factor of 5.03 x 105. By utilizing a hybrid cavity_consisting of a microring coupled to a U-shaped waveguide at two symmetric points_we exploit the Vernier effect to achieve robust longitudinal mode selection. Under a non-resonant 1480 nm pumping scheme, the laser yields a side_mode suppression ratio (SMSR) of 53.3 dB and a narrow linewidth of 9.5 pm. A slope efficiency of 2.76 % is achieved_the highest reported to date for Er:Ta2O5 lasers_with a lasing threshold of 3.3 mW. Furthermore, stable single-mode tuning is demonstrated across a temperature range of 18_68 celsius, consistently aligning with theoretical transfer matrix models. This work provides a scalable pathway for high-efficiency, tunable on-chip light sources, bridging the gap for monolithic active-passive integration on the tantalum oxide photonic platform.

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Like Shui, Ruixuan Yi, Chenyang Zhao, Jinlong Lu, Xiaotong Zhang, Jiaqiao Zhang, Xuetao Gan. 2026-01-31. On-Chip Erbium-Doped Tantalum Oxide Microring Hybrid Cavity Single-Mode Laser. https://arxiv.org/abs/2602.00695

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