FAR-FIELD EMISSION NARROWING EFFECT OF MICRODISK LASERS

Far-field intensity distribution of semiconductor microdisk lasers is experimentally measured and the emission angle is found to be much sma ller than that of a planar source with the same near-held width. In fa ct the emission angle is determined mainly by the disk radius instead of the disk thickness. A scalar diffraction theory in the cylindrical coordinate is developed to explain such an emission-angle-narrowing ph enomenon and numerical calculation based on a vectorial diffraction th eory is carried out to explain the measured polarization state. (C) 19 98 American Institute of Physics.