Abstract
We experimentally investigate the threshold and slope efficiency of a vertical cavity surface-emitting laser (VCSEL) as functions of the pump wavelength in the 700–900 nm range. While most VCSELs exploit pump wavelengths in the 700–760 nm range for optimum absorption in the spacers between the quantum wells, we show that equally good performance can be obtained using longer wavelengths appropriate for diode laser pumping, provided that the pump wavelength is chosen to match a cavity resonance.
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