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Multi-frequency self-injection locking of a FSR-tunable multimode laser diode.
Optics Letters
|November 15, 2023
Summary
Researchers achieved controllable multi-frequency self-injection locking using a novel setup. This method generates 1 to 4 narrow laser lines on demand, crucial for telecommunications and advanced sources.
Area of Science:
- Photonics
- Optical Engineering
- Laser Physics
Background:
- Self-injection locking (SIL) is a technique to stabilize and narrow laser emission.
- Controlling multi-frequency operation in SIL systems is challenging but essential for advanced applications.
Purpose of the Study:
- To demonstrate controllable multi-frequency self-injection locking regimes.
- To investigate the conditions for simultaneous mode locking analogous to the Vernier effect.
- To enable on-demand generation of multiple narrow laser lines.
Main Methods:
- Utilized an experimental setup with a reflective semiconductor optical amplifier, an external feedback mirror, and a high-Q silicon nitride (Si3N4) ring microresonator.
- Varied the free spectral range of the external-cavity laser by adjusting its length.
- Observed and analyzed the self-injection locking phenomena.
Main Results:
- Successfully realized controllable multi-frequency self-injection locking.
- Demonstrated simultaneous locking of multiple modes, exhibiting a Vernier-like effect.
- Achieved robust generation of 1 to 4 self-injection locked narrow lines by tuning the laser cavity length.
Conclusions:
- The developed experimental setup enables precise control over multi-frequency SIL.
- The findings are significant for applications in optical telecommunications and the development of photonic-based microwave and Terahertz (THz) sources.
