Full text loading...
Polarization resolved RT PL of a six QDH layers separated by a 15 nm spacer, continuous line (dashed line) corresponds to the polarizer orientation along the (respectively, along ) direction. Inset is a AFM image of the last uncovered layer of a six QDH layer sample. The arrow indicates the crystallographic direction.
Polarization resolved RT light output characteristics of a QDH VCSEL vs the input optical power density in continuous mode. Open circles (open squares) corresponds to the output intensity along the (respectively, ) direction. Indicated are the OPSR below and above threshold. Insets are spectra taken at pump power according to the polarizer orientation, continuous line along , and dashed lines along the  presenting a 30 dB OPSR.
Typical polarization resolved RT spectra from QW VCSELs (a) and QDH VCSELs (b), measured above threshold (in cw) at different location on samples (average spacing between VCSELs of 3 mm). Continuous line corresponds to the polarizer orientation along direction, dashed lines along the . Close to each spectrum, the OPSR is indicated.
OPSR measurements of the QDH VCSEL vs sample temperature. OPSR has been measured from polarization resolved spectra above threshold in continuous excitation. The arrow indicates the maximal temperature for which cw lasing operation is still observed. Insets are typical polarization resolved spectra measured at 6 and .
Article metrics loading...