Wavelength-Tunable Narrow-Linewidth Laser Diode Based on Self-Injection Locking with a High-Q Lithium Niobate Microring Resonator

作者：Huang, Ting; Ma, Yu; Fang, Zhiwei^*; Zhou, Junxia; Zhou, Yuan; Wang, Zhe; Liu, Jian; Wang, Zhenhua; Zhang, Haisu; Wang, Min; Xu, Jian^*; Cheng, Ya^*

来源：Nanomaterials, 2023, 13(5): 948.

DOI：10.3390/nano13050948

• lithium niobate
• microring resonator
• photolithography
• chemo-mechanical etching
• narrow linewidth
• self-injection locking

We demonstrate a narrow linewidth 980 nm laser by self-injection locking of an electrically pumped distributed-feedback (DFB) laser diode to a high quality (Q) factor (>10(5)) lithium niobate (LN) microring resonator. The lithium niobate microring resonator is fabricated by photolithography-assisted chemo-mechanical etching (PLACE) technique, and the Q factor of lithium niobate microring is measured as high as 6.91 x 10(5). The linewidth of the multimode 980 nm laser diode, which is similar to 2 nm measured from its output end, is narrowed down to 35 pm with a single-mode characteristic after coupling with the high-Q LN microring resonator. The output power of the narrow-linewidth microlaser is about 4.27 mW, and the wavelength tuning range reaches 2.57 nm. This work explores a hybrid integrated narrow linewidth 980 nm laser that has potential applications in high-efficient pump laser, optical tweezers, quantum information, as well as chip-based precision spectroscopy and metrology.

• 单位
  中国科学院; y; 中国科学院研究生院