Physics

Laser linewidth

Nanotechnology

Distributed Bragg reflector laser

Laser

Vertical-cavity surface-emitting laser

Optics

Physical chemistry

Chemistry

Materials science

Polarization (electrochemistry)

Distributed Bragg reflector

Lasing threshold

Orthogonal polarization spectral imaging

Nanoporous

Optoelectronics

Wavelength

Applied Physics Express

We demonstrate the first electrically injected nonpolar m-plane GaN-based vertical-cavity surface-emitting lasers (VCSELs) with lattice-matched nanoporous bottom DBRs. Lasing under pulsed operation at room temperature was observed near 409 nm with a linewidth of ∼0.6 nm and a maximum output power of ∼1.5 mW. The VCSELs were linearly polarized and polarization-locked in the a-direction, with a polarization ratio of 0.94. The high polarization ratio and polarization pinning reveal that the optical scattering from the nanoporous DBRs is negligible. A high characteristic temperature of 357 K resulted from the slightly negative offset between the peak gain and cavity mode wavelengths.

Electrically injected nonpolar GaN-based VCSELs with lattice-matched nanoporous distributed Bragg reflector mirrors