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Active stabilization of laser diode injection using a polarization-spectroscopy technique.
Luka Milanovic1,2, Greg Ferrero1,2, Robin Oswald1,3
1ETH Zürich - PSI Quantum Computing Hub, PSI, 5232 Villigen, Switzerland.
The Review of Scientific Instruments
|May 6, 2025
Summary
We developed a modulation-free method to stabilize laser diode injection-locking. This technique enhances operational stability against environmental fluctuations, crucial for low seed power and swept frequency applications.
Area of Science:
- Optics and Photonics
- Laser Physics
Background:
- Laser diode injection-locking amplifies light while preserving spectral properties.
- Environmental fluctuations can destabilize injection-locking, particularly at low seed powers or with swept frequencies.
Purpose of the Study:
- To present a method for monitoring and actively stabilizing laser diode injection-locking.
- To improve the reliability and operating range of injection-locked laser diodes.
Main Methods:
- A modulation-free scheme inspired by the Hänsch-Couillaud setup.
- Utilizes minimal optical components for continuous background operation.
Main Results:
- Demonstrated robustness against significant fluctuations in diode temperature, seed frequency, and power.
- Successfully extended the stable operating range and long-term stability of injection-locking.
Conclusions:
- The presented method effectively stabilizes laser diode injection-locking.
- Offers a practical solution for enhancing laser system reliability in demanding conditions.
