Abstract
An experimental investigation of lasing characteristics in InGaAs-GaAs vertical-cavity surface-emitting lasers (VCSELs) grown on GaAs(311)A substrates is presented. To improve temperature characteristics, the gain peak wavelength was detuned by -33 mm from the VCSEL cavity mode. It was found that anisotropic in-plane gain distribution in (311)A-oriented quantum wells (QWs) effectively controls polarization of VCSELs. A stable polarization mode was always exhibited along the [233] direction, which corresponds to the crystallographic axis of maximum gain for (311)-oriented QWs, The [233] polarization mode was maintained against injection currents of more than 2.5 times the threshold over the wide temperature range of 25/spl deg/C to 150/spl deg/C. The orthogonal [011] polarization mode was completely suppressed, and an suppression ratio of 19.8 dB between two orthogonal polarization modes was obtained at 1.8 times the threshold current at 80/spl deg/C, the temperature at which the gain peak matches the cavity mode. In addition, a threshold current of 680 /spl mu/A and a corresponding threshold current density of 55 A/(cm/sup 2//spl middot/well) were achieved for a 25-/spl mu/m square etched mesa device at 80/spl deg/C.
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