%0 Journal Article %T Coherent combination of four laser beams in a multi-axis Fourier cavity using a diffractive optical element %+ Institut de Recherche en Communications Optiques et Microondes (IRCOM) %A Tondusson, Marc %A Froehly, Claude %A Kermène, Vincent %A Vampouille, Michel %< avec comité de lecture %@ 1464-4258 %J Journal of Optics A: Pure and Applied Optics %I IOP Publishing %V 3 %8 2001 %D 2001 %Z Engineering Sciences [physics]/Optics / PhotonicJournal articles %X Thermal aberrations in diode-pumped solid-state laser media are well known. To avoid these effects we propose to end-pump separated zones of a laser crystal with elementary beams of moderate power. We present a multi-axis laser cavity with a single-gain medium longitudinally pumped by four fibre-coupled laser diodes. The four elementary laser beams are coherently combined inside the cavity by a diffractive optical element. 82% of the laser power is focused in a single diffraction limited beam. %G English %L hal-01278021 %U https://unilim.hal.science/hal-01278021 %~ UNILIM %~ CNRS %~ XLIM