Abstract: Stackable laser array elements may be configured to absorb heat effectively from laser elements, to be efficiently repaired and/or replaced, and to be effectively tested. An assembly includes readily replaceable cells having a cavity for the passage of coolant therethrough to cool the laser elements. The cells may be constructed individually for individual testing, and then stacked together and removably secured for easy replacement. The cavities of the cells form a substantially contiguous cavity through the entire assembly for the flow of coolant into and out of the assembly. The cavities of the cells include regions and surfaces which enhance the flow of coolant to regions substantially adjacent to the laser elements for the cooling thereof to provide enhanced cooling of the laser elements in the stack of cells. The flow of the coolant is oriented vertically with respect to horizontally oriented laser elements.

Abstract: A method and apparatus pump a laser gain medium of a laser rod having a first longitudinal axis. At least one pump light source emits pump light to the laser rod, and the pump light source has a second longitudinal axis which is perpendicular to the first longitudinal axis. Radiation from various laser diode arrays is collimated and uniquely arranged in a vertical orientation in relation to the laser gain medium. Reflectors focus the collimated radiation from the diode arrays onto the laser gain medium to achieve fundamental mode operation or Transverse Electromagnetic mode (TEM00 mode) operation. Both laser gain medium and reflectors may be simultaneously cooled with appropriate fluids in the apparatus. The assembly of the apparatus may be extended to hold a plurality of vertically oriented laser diode arrays to increase the laser pump power.