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Polarization switching and injection locking in vertical-cavity surface-emitting lasers subject to parallel optical
Optics Letters
|June 1, 2016
Summary
Researchers analyzed polarization switching in long-wavelength vertical-cavity surface-emitting lasers (VCSELs) under optical injection. They experimentally observed simultaneous injection locking and orthogonal polarization excitation, a novel finding with constant total power output.
Area of Science:
- Optoelectronics
- Laser Physics
- Semiconductor Devices
Background:
- Vertical-cavity surface-emitting lasers (VCSELs) are crucial optoelectronic components.
- Understanding polarization dynamics in VCSELs is essential for advanced applications.
- Optical injection is a key method for controlling VCSEL behavior.
Purpose of the Study:
- To theoretically and experimentally analyze polarization switching in long-wavelength VCSELs.
- To investigate the simultaneous occurrence of injection locking and free-running orthogonal polarization excitation.
- To develop analytical expressions describing the behavior of both linear polarizations.
Main Methods:
- Theoretical analysis of polarization switching under parallel optical injection.
- Experimental investigation of VCSEL behavior under optical injection.
- Linear stability analysis to determine parameter regions for observed phenomena.
Main Results:
- Experimental observation of simultaneous injection locking of parallel polarization and excitation of orthogonal polarization.
- Derivation of simple analytical expressions for both linear polarizations.
- Demonstration of a linear dependence of polarization power on injected power, maintaining constant total output power.
Conclusions:
- The study reports a novel operating state in VCSELs under optical injection.
- Theoretical predictions regarding polarization behavior and power distribution are qualitatively confirmed by experimental measurements.
- The findings provide a deeper understanding of polarization dynamics in VCSELs.
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