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Spatial coherence of broad-area laser diodes
Henri Partanen1, Jani Tervo, Jari Turunen
1University of Eastern Finland, Department of Physics and Mathematics, P.O. Box 111, Joensuu FI-80101, Finland. henri.partanen@uef.fi
Applied Optics
|May 15, 2013
Summary
We present a new method for modeling the spatial coherence of broad-area laser diodes (BALDs). This technique accurately predicts laser diode behavior even with distorted modal structures, improving coherence and propagation modeling.
Area of Science:
- Optics and Photonics
- Laser Physics
Background:
- Broad-area laser diodes (BALDs) are crucial in various applications.
- Accurate modeling of their spatial coherence is essential for performance prediction.
- Existing methods like Mercer-type expansion can be insufficient for real-world BALDs.
Purpose of the Study:
- To develop an accurate model for the spatial coherence of BALDs.
- To address limitations of standard coherent-mode expansion for distorted modal structures.
- To provide a reliable tool for coherence and propagation modeling of BALDs.
Main Methods:
- Representing mutual intensity as superpositions of fully coherent, uncorrelated fields.
- Analyzing spectroscopic modal structure and intensity-based mode recovery.
- Applying a shifted elementary-field method for coherence modeling.
Main Results:
- Standard Mercer-type expansion yields unsatisfactory results for real BALDs.
- The shifted elementary-field method provides sufficiently accurate spatial coherence modeling.
- This method remains effective even with severely distorted BALD modal structures.
Conclusions:
- The shifted elementary-field method is a robust tool for BALD spatial coherence and propagation.
- It overcomes limitations of traditional methods, especially for complex modal structures.
- This advancement facilitates better design and application of BALDs.
