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Two-dimensional pseudo-random optical phased array based on tandem optical injection locking of vertical cavity
Optics Express
|September 15, 2015
Summary
Researchers developed a pseudo-random, two-dimensional optical phased array (OPA) using tandem injection locking of vertical cavity surface emitting laser (VCSEL) arrays. This novel approach enables controllable optical phase shifts and high-quality beam formation for potential beam steering applications.
Area of Science:
- Optics and Photonics
- Semiconductor Lasers
- Array Antennas
Background:
- Optical phased arrays (OPAs) are crucial for beam steering.
- Vertical cavity surface emitting lasers (VCSELs) offer scalability for OPA development.
- Injection locking is a key technique for controlling laser arrays.
Purpose of the Study:
- To demonstrate a pseudo-random, two-dimensional OPA concept.
- To investigate tandem injection locking of VCSEL arrays for OPA applications.
- To evaluate beam quality and steering capabilities.
Main Methods:
- Theoretical and experimental demonstration of a pseudo-random OPA.
- Utilizing tandem injection locking of 64-element VCSEL arrays.
- Employing a low cavity-Q VCSEL design for enhanced scaling.
Main Results:
- Achieved controllable optical phase change from 0 to 1.6π.
- Demonstrated high-quality beam formation with suppressed grating lobes.
- Validated performance close to simulation results.
- Showcased preliminary 2.2° x 1.2° beam steering.
Conclusions:
- The pseudo-random OPA concept using tandem injection locking is feasible.
- Low cavity-Q VCSELs provide significant OPA scaling potential.
- The demonstrated OPA offers precise beam control and high beam quality.
