JoVE - Journal of Visualized Experiments
JoVE Visualize
Contact Us

Low-loss compact chalcogenide microresonators for efficient stimulated Brillouin lasers

Optics Letters +

|

August 15, 2024

|

August 15, 2024

View abstract on PubMed

Summary

This summary is machine-generated.

This study introduces a novel Germanium-Antimony-Sulfur (GeSbS) chalcogenide glass (ChG) photonic device for stimulated Brillouin scattering (SBS) applications. The new device achieves a high quality factor and enables low-threshold, narrow-linewidth lasers and high-frequency microwave generation.

Area Of Science

  • Photonics
  • Materials Science
  • Optoelectronics

Background

  • Chalcogenide glasses (ChGs) offer high elasto-optic coefficients, suitable for microwave photonics and stimulated Brillouin scattering (SBS) lasers.
  • Existing As2S3-based integrated devices exhibit poor stability and low laser-induced damage thresholds, while planar ChG devices have limited quality factors.

Purpose Of The Study

  • To propose and demonstrate a high-quality integrated Germanium-Antimony-Sulfur (GeSbS) chalcogenide glass (ChG) Brillouin photonic device.
  • To overcome limitations of existing ChG devices, improving stability, damage threshold, and quality factors for enhanced SBS applications.

Main Methods

  • Fabrication of a finger-shaped GeSbS microresonator incorporating Euler bending structures.
  • Suppression of high-order optical modes and reduction of propagation losses within the microresonator.
  • Characterization of the device's quality factor, Brillouin gain, laser threshold, linewidth, and cascaded SBS generation.

Main Results

  • Achieved a compact footprint of 3.8 mm² and a high intrinsic quality factor of 5.19 × 10⁶.
  • Demonstrated stimulated Brillouin lasers with a low threshold of 0.96 mW and a fundamental linewidth of 58 Hz.
  • Successfully realized cascaded stimulated Brillouin lasers up to the seventh order, producing microwave beat frequencies up to 40 GHz.

Conclusions

  • The developed GeSbS ChG Brillouin photonic device offers superior performance compared to existing technologies.
  • The device's high quality factor and material gain enable efficient SBS laser generation and high-frequency microwave signal production.
  • This work paves the way for advanced integrated photonic devices in microwave photonics and laser applications.