A surface-emitting laser includes optically transparent layers on a side of a DBR mirror structure that is opposite to an optical cavity of the laser. In one embodiment, the transparent layer is a heat-conducting layer that has an efficient heat transfer relationship with an opening in a top electrode...http://www.google.com.tw/patents/US5596595?utm_source=gb-gplus-share專利 US5596595 - Current and heat spreading transparent layers for surface-emitting lasers
