Nanomaterials (Mar 2023)

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

  • Ting Huang,
  • Yu Ma,
  • Zhiwei Fang,
  • Junxia Zhou,
  • Yuan Zhou,
  • Zhe Wang,
  • Jian Liu,
  • Zhenhua Wang,
  • Haisu Zhang,
  • Min Wang,
  • Jian Xu,
  • Ya Cheng

DOI
https://doi.org/10.3390/nano13050948
Journal volume & issue
Vol. 13, no. 5
p. 948

Abstract

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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 (>105) 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 × 105. The linewidth of the multimode 980 nm laser diode, which is ~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.

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