While semiconductor lasers are the most efficient high power sources of optical radiation, their wide and unstable emission spectra and high divergence of radiation impede their utilization in a number of important industrial, medical, military, and scientific applications. One of the widely studied approaches to improve brightness of semiconductor lasers is the use of external resonators that provide...
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.
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.
Financed by the National Centre for Research and Development under grant No. SP/I/1/77065/10 by the strategic scientific research and experimental development program:
SYNAT - “Interdisciplinary System for Interactive Scientific and Scientific-Technical Information”.