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Transverse mode dynamics of VCSELs through space-time domain simulation
Optics Express
|April 29, 2009
Summary
This study models transverse mode dynamics in vertical-cavity surface-emitting lasers (VCSELs) using an approximation to Maxwell-Semiconductor Bloch equations. The developed finite-difference algorithm offers a general approach to simulating VCSEL behavior.
Area of Science:
- Optics and Photonics
- Semiconductor Physics
- Computational Physics
Background:
- Vertical-cavity surface-emitting lasers (VCSELs) are crucial optoelectronic devices.
- Understanding transverse mode dynamics is essential for VCSEL performance optimization.
- Existing models may lack generality in device shape or guiding mechanisms.
Purpose of the Study:
- To develop a general computational model for transverse mode dynamics in VCSELs.
- To incorporate nonlinear carrier effects and dispersion into the laser model.
- To provide a flexible simulation tool for various VCSEL designs.
Main Methods:
- Utilized an approximation to the Maxwell-Semiconductor Bloch equations.
- Employed a finite-difference algorithm to solve time-evolution equations.
- Included nonlinear carrier dependence of optical gain and refractive index.
- Incorporated dispersion effects on gain and refractive index.
Main Results:
- Successfully modeled the time-evolution of spatial profiles for laser fields and carrier density.
- The finite-difference algorithm demonstrated generality for arbitrary device shapes and guiding types (gain/index).
- The model accommodates any number or type of transverse modes without prior assumptions.
Conclusions:
- The developed model provides a versatile tool for analyzing VCSEL transverse mode dynamics.
- The inclusion of nonlinear carrier effects and dispersion enhances simulation accuracy.
- This approach facilitates the design and optimization of diverse VCSEL structures.
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