We report on a compact and highly efficient diode-end-pumped TEM 00 Nd YVO 4 slab laser with an output power of 103W and beam quality M 2 1.5 . The optical-to-optical efficiency was 41.5%. In electro-optically Q -switched operation, 83W of average power at a pulse-repetition rate of 50 kHz with a pulse length of 11.3ns was obtained. At a pulse-repetition rate of 10kHz, 5.6mJ of pulse energy, and 870kW of peak power were measured.