| 摘要 |
Disclosed is a laser, to be referred to as a "Z-laser", which comprises means that can ensure excitation of a laser mode that has a far field pattern that comes substantially to a focus at a point external to the laser. Typically, a Z-laser is a vertical cavity surface emitting laser (VCSEL) that comprises an appropriately patterned top surface. Exemplarily, appropriately spaced circular concentric features ("trenches") are formed in the surface. Lasers according to the invention can be advantageously used in variety of applications, e.g., as pump lasers in an optically amplified optical fiber communication system.
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