A Nd:YAG slab is partially end pumped by a diode laser stack with thre
e diode laser bars. The pumped and is off-axis unstable in the plane o
f large dimension of the gain cross section, was used to yield highly
efficient laser operation at diffraction-limited beam quality. The las
er design and experimental results are reported. (C) 1998 Optical Soci
ety of America.