Li Huiqi, Wang Zhaocong, Lu Qingming, Wang Lei, Tan Yang, Chen Feng
Opt Lett. 2024 Mar 15;49(6):1397-1400. doi: 10.1364/OL.515441.
The integration of heterogeneous optical components onto an optical platform is crucial for the advancement of photonic chips. To achieve this, efficient coupling of optical signals between components and the platform is essential. Here, we have successfully integrated a Nd:YAG microdisk laser with a lithium-niobate-on-insulator (LNOI) photonic platform by modulating the propagation modes of LNOI. Ridge waveguides are fabricated on the LNOI by carefully adjusting the cross-sectional dimensions to enable the propagation of higher-order propagation modes. This ridge waveguide ensures that the effective refractive index of the higher-order mode closely matches that of the fundamental mode of the Nd:YAG microdisk, ensuring efficient waveguide-microdisk coupling. This on-chip laser, consisting of an Nd:YAG microdisk and LNOI integration, achieves a maximum output power of 23 µW, and a mode suppression ratio of 53.6 dB. This research presents an efficient approach for constructing highly functional heterogeneous integrated optical chips.
将异质光学元件集成到光学平台上对于光子芯片的发展至关重要。要实现这一点，元件与平台之间光信号的高效耦合至关重要。在此，我们通过调制绝缘体上铌酸锂（LNOI）的传播模式，成功地将掺钕钇铝石榴石（Nd:YAG）微盘激光器与LNOI光子平台集成在一起。通过仔细调整横截面尺寸在LNOI上制造脊形波导，以实现高阶传播模式的传播。这种脊形波导确保高阶模式的有效折射率与Nd:YAG微盘的基模有效折射率紧密匹配，从而确保波导与微盘的高效耦合。这种由Nd:YAG微盘和LNOI集成组成的片上激光器实现了23 μW的最大输出功率和53.6 dB的模式抑制比。本研究提出了一种构建高功能异质集成光学芯片的有效方法。
