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FTIR transmission spectrum of the VCSEL structure at (dots). The order of each of the three resonances is indicated. The corresponding calculation is shown as solid line. Inset: Cross-sectional SEM micrograph of the MBE-grown structure.
(a) Emission spectra of the laser structure at above (pump power , filled squares) and below threshold (pump power , open squares, strongly enlarged scale). The measured linewidth and spectrometer resolution (as denoted by –∥–) are indicated. The solid lines represent Gaussian line fits to the experimental data. (b) Emission intensity versus cw pump power for different temperatures plotted on a logarithmic scale. The open symbols at 60 and indicate spontaneous emission. The inset shows the pump power dependence at on a linear scale. The threshold at each temperature is indicated by arrows. The lines are guides for the eye.
Tuning characteristic of the emission wavelength of the VCSEL by temperature (filled dots) with a linear tuning coefficient of . The dashed line is a linear fit to the data. The inset shows the angular emission of the VCSEL (filled squares) with a sketch of the measurement geometry. The solid line is a Gaussian line fit to the experimental data.
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