A mounting improvement for the solid state laser bars used for example to pump high power lasers is provided. Solid state laser bars are mounted in side by side relationship and combined with integrated substrate and laser output directing optical elements on a disclosed Integrated Diamond Carrier. The Integrated Diamond Carrier is preferably fabricated as an essentially freestanding base plate of diamond composition with incorporated arrays of mesa structures providing mounting for the laser bars and providing integral laser output directing optical elements such as mirrored prisms. Integrated diamond carriers according to the invention provide stable positioning, desirable thermal conductivity and consistent low temperature operation for the solid state lasers.