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Narrow linewidth Brillouin laser based on chalcogenide photonic chip
Irina V Kabakova1, Ravi Pant, Duk-Yong Choi
1Institute of Photonics and Optical Sciences (IPOS), School of Physics, University of Sydney, Sydney, NSW 2006, Australia. kabakova@physics.usyd.edu.au
Optics Letters
|August 31, 2013
Summary
We demonstrate the first narrow linewidth, waveguide-based Brillouin laser using a chalcogenide chip, achieving a low threshold and 100 kHz linewidth.
Area of Science:
- Photonics and optical engineering
- Materials science
Background:
- Brillouin lasers are crucial for various optical applications.
- Achieving narrow linewidths and low thresholds in waveguide-based systems remains a challenge.
Purpose of the Study:
- To demonstrate the first narrow linewidth, waveguide-based Brillouin laser utilizing a chalcogenide chip.
- To leverage large Brillouin gain for improved laser performance.
Main Methods:
- Fabrication of chalcogenide waveguides with vertical tapers for efficient light coupling.
- Implementation of optical feedback for the Stokes wave to reduce the lasing threshold.
- Measurement of laser parameters including threshold, slope efficiency, and linewidth using a self-heterodyne method.
Main Results:
- Demonstration of a waveguide-based Brillouin laser with a narrow linewidth of 100 kHz.
- Achieved a significantly reduced lasing threshold of 360 mW, five times lower than the single-pass threshold.
- Measured a slope efficiency of 30%.
Conclusions:
- Chalcogenide chips enable high-gain Brillouin lasers in a compact waveguide format.
- The developed laser exhibits excellent performance characteristics, including narrow linewidth and low threshold.
- This work paves the way for advanced integrated photonic devices utilizing Brillouin scattering.
