Polarization control of vertical-cavity surface-emitting lasers by electro-optic birefringence

摘要

Polarization of vertical-cavity surface-emitting lasers (VCSELs) grown on (001) GaAs substrate has been controlled by electro-optic birefringence. Birefringence was induced at the top distributed Bragg reflector by applying an electric field along the 001 direction. The cavity resonance of the polarized light along the 110 or 110 direction shifted to shorter and longer wavelength, depending on the direction of the applied electric field. By varying the direction and strength of the electric field, we actively controlled the polarization of VCSELs. The dominant polarization mode occurred along the 110 direction for the negative electric field, and along the 110 direction for the positive electric field.