Temperature behaviour of top mirror reflection spectrum in intra-cavity-contacted oxide-confined vertical-cavity surface-emitting lasers

The thermal dependence of mirror reflective properties in oxide-confined vertical-cavity surface-emitting lasers is investigated. The temperature distribution over a cavity versus applied current is then calculated. The refractive indexes of the mirror layers are subsequently redefined using the temperature coefficients, and changes in radial reflectance spectra of the mirror are analysed. Results show a shift of stop-band and Bragg wavelengths of the mirror, as well as a shift of laser operation wavelength at different injection currents and the formation of a temperature lens in the mirror due to a decrease in temperature close to the edge of the oxide windows.