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Modal properties of single mode lithographic VCSELs are studied for use in densely packed 2-D arrays for improved spectral control, improved beam quality, and high pulse power.
Over 50% power conversion efficiency (PCE) has been reached in an oxide-free VCSEL. VCSELs with very small size (2 µm) have shown high single transverse mode selectivity and good lasing characteristics.
The metal influence on light emitters has been studied for more than twenty years in semiconductor light emitters. A critical feature is reliance on the correct electromagnetic boundary conditions to understand and predict the performance of either lasers or spontaneous light emitters for which the metal may influence the emission properties. Here we show that nearly (all) recent studies of metal-coupled...
The influence of AlAs placed at various locations in oxide and non-oxide mode-confined VCSELs is studied. Experimental results show that removing oxide and introducing AlAs in various locations of the VCSEL DBRs can dramatically reduce the thermal resistance.
We analyze ultrafast circular polarization oscillations in a commercial vertical-cavity surface-emitting laser after spin injection at room temperature. The circular polarization exhibits faster dynamics than the intensity and longer persistence than the spin relaxation time.
Spin-polarized lasers offer new encouraging possibilities for future devices. We compare time-resolved luminescence measurements with theoretical models for spin dynamics in spin-polarized lasers and demonstrate ultrafast polarization switching during one short single-mode laser pulse.
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