An optical amplifier which includes an elongated slab of solid state lasing material, such as a rare earth doped yttrium-aluminum-garnet (YAG). In order to provide a relatively increased absorption length and thus a higher overall efficiency, the optical amplifier in accordance with the present invention...http://www.google.se/patents/US6094297?utm_source=gb-gplus-sharePatent US6094297 - End pumped zig-zag slab laser gain medium
