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Phase-locked array of quantum cascade lasers with an integrated Talbot cavity
Optics Express
|January 7, 2017
Summary
A new diffraction-coupled quantum cascade laser array with a Talbot cavity achieves stable in-phase operation. This laser design enhances output power and shows potential for improved beam characteristics.
Area of Science:
- Quantum optics
- Semiconductor lasers
Background:
- Quantum cascade lasers (QCLs) are crucial for mid-infrared applications.
- Achieving stable, high-power operation in laser arrays is a persistent challenge.
Purpose of the Study:
- To demonstrate a phase-locked array of three quantum cascade lasers using diffraction coupling.
- To achieve stable in-phase mode operation through Talbot cavity integration.
Main Methods:
- Fabrication of a three-element quantum cascade laser array.
- Integration of a Talbot cavity with a length of Zt/4.
- Characterization of modal stability and far-field radiation patterns.
Main Results:
- Stable in-phase mode operation was achieved by controlling the Talbot cavity length.
- The in-phase operation exhibited high modal stability across varying injection currents.
- The far-field pattern showed a distinct three-lobe structure with a 10.5° lobe separation.
- Output power was approximately 1.5 times that of a single-ridge laser.
Conclusions:
- Diffraction coupling with a Talbot cavity is an effective method for achieving stable in-phase operation in quantum cascade laser arrays.
- The demonstrated device offers enhanced output power compared to single lasers.
- Further optimization is needed to improve beam quality and reduce optical losses from the Talbot cavity.
