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Single-mode lasing in an AlGaInAs/InP dual-port square microresonator
Optics Letters
|August 1, 2022
Summary
Researchers developed a novel dual-port square microresonator for stable single-mode lasing, achieving over 40 dB side-mode suppression ratio. This design enables two simultaneous optical sources for integrated photonic circuits.
Area of Science:
- Optics and Photonics
- Integrated Photonics
- Microcavity Lasers
Background:
- Stable single-mode lasing is essential for microlaser applications.
- Traditional microresonator designs often struggle with mode selectivity.
- Achieving high side-mode suppression is critical for laser performance.
Purpose of the Study:
- To demonstrate a novel dual-port square microresonator for stable single-mode lasing.
- To investigate the mode characteristics and interference patterns of the microresonator.
- To explore the potential of this microlaser for optical signal processing.
Main Methods:
- Experimental fabrication and characterization of a dual-port square microresonator.
- Analysis of quality factors for symmetric (SM) and antisymmetric (ASM) modes.
- Observation and analysis of far-field interference patterns.
Main Results:
- Achieved stable single-mode lasing with a side-mode-suppression ratio (SMSR) exceeding 40 dB.
- Demonstrated significantly higher quality factor for the ASM compared to the SM due to waveguide coupling.
- Observed far-field interference patterns analogous to Young's two-slit experiment.
Conclusions:
- The dual-port square microresonator design effectively enables stable single-mode lasing.
- The asymmetric coupling enhances the quality factor of the desired mode, suppressing unwanted modes.
- This microlaser offers potential for generating two simultaneous optical sources for advanced integrated photonic circuits.
