Optically pumped ultraviolet AlGaInN quantum well laser at 340 nm wavelength

Abstract

We have demonstrated and characterized an optically pumped room temperature pulsed laser at 340 nm, based on a separate confinement AlGaInN multiple quantum well heterostructure design. The lasing was achieved at threshold peak power of ∼800 kW/cm2. Gain spectroscopy showed modest peak modal gain on the order of 5 cm−1, suggesting that the combination of weak optical confinement and nonradiative recombination would lead to high threshold currents for comparably constructed diode lasers.