Low thermal resistance 780nm GaInPAs/GaInP 40ch VCSEL array for laser printers

We have developed a 780nm 40ch VCSEL array for laser printers. Low thermal resistance has been achieved by improving the layer construction, with the result that laser power changing due to self-heating and thermal interference in the array have been stabilized. Moreover, single-mode high power and stable polarization have been achieved by GaInPAs strained quantum wells grown on 15° off GaAs substrate and anisotropically-shaped transverse mode filter on the output surface.