These devices will open the way to significant cost savings and new applications for high-power laser diode arrays.Dr. B.L. Volodin, S.V. Dolgy, E. Downs, E.D. Melnik, J. Shaw, Dr. V.S. Ban and E. McIntyre, PD-LD Inc.High-power multimode laser diodes, emitting >1 W per diode, and laser diode arrays, emitting tens or even hundreds of watts, have many important applications, such as medicine, materials processing and pumping solid-state lasers. The market for them in areas other than telecommunications is strong and growing. These devices typically emit approximately 1 W from a 100 × 1-μm area, although some can emit as much as 4 W from an aperture of this size. The spectral characteristics of their emission, however, typically are not very tightly controlled. 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