Low threshold QD laser with threshold current density <10 A/cm2 is experimentally shown and threshold current temperature dependence of a QD laser with an ideal delta function density of electronic states is analyzed.
Data are presented demonstrating that a low-threshold quantum dot laser diode can achieve very low internal optical loss. The broad-area laser diode operates at the wavelength 1.22 m and delivers 2 W of power from a 1.6 cm-long cavity with uncoated facets, with a lasing threshold current density of 10.4 A/cm2. The laser diode's internal waveguide loss is extracted from cavity length measurements to...
Large cavity, very low threshold single layer quantum dot laser diodes with threshold current density of 10 A/cm2, output power > 2 W, and very-low internal loss of 0.25 cm-1 are achieved at CW room-temperature. Mode-locked operation of a large cavity laser diode with 40 mum stripe width is demonstrated at 3.75 GHz repetition rate.
The physics of quantum dot lasers are studied theoretically and experimentally to study their threshold temperature dependence, and the relationship between internal loss and threshold current density.
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