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Coupled cavity laser based on anti-resonant imaging via multimode interference.
Optics Letters
|February 14, 2015
Summary
We demonstrated coupled laser cavities using self-imaging interference in multimode waveguides. This method enhances mode selectivity, enabling tunable lasers with high side-mode suppression and a wide tuning range.
Area of Science:
- Optics and Photonics
- Laser Physics
- Waveguide Technology
Background:
- Coupled laser cavities are fundamental for advanced laser systems.
- Achieving high mode selectivity and tunability is crucial for laser performance.
- Multimode waveguides offer potential for compact and integrated photonic devices.
Purpose of the Study:
- To experimentally demonstrate coupled laser cavities using self-imaging interference.
- To optimize coupling through analysis of phase-delayed signals and splitter characteristics.
- To fabricate and characterize a tunable laser based on this coupled cavity system.
Main Methods:
- Utilizing self-imaging interference in a multimode waveguide to couple two laser cavities.
- Optimizing the coupling element by analyzing complex transfer coefficients derived from phase-delayed signals at a 3x3 splitter.
- Fabricating a tunable laser incorporating the optimized coupled cavity design.
Main Results:
- Successful experimental demonstration of coupled laser cavities.
- Achieved a side-mode suppression ratio (SMSR) of up to 40 dB.
- Demonstrated a laser tuning range of 6.5 nm with milliwatt output power.
Conclusions:
- Self-imaging interference provides an effective method for creating coupled laser cavities.
- The optimized coupling enhances mode selectivity, leading to improved laser performance.
- The demonstrated tunable laser is compatible with standard fabrication processes.
