Coherent light generators – Particular active media – Semiconductor
Patent
1994-05-27
1995-06-20
Bovernick, Rodney B.
Coherent light generators
Particular active media
Semiconductor
372 50, 372 99, 372102, 372101, H01S 31055, H01S 3085
Patent
active
054266572
ABSTRACT:
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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patent: 5132843 (1992-07-01), Aoyama et al.
patent: 5181220 (1993-01-01), Yagi
patent: 5218655 (1993-06-01), Mizrahi
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"High-power coherently coupled 8.times.8 vertical cavity surface emitting laser array", by R. A. Morgan et al., Applied Physics Letters, vol. 61, Sep. 7, 1992, pp. 1160-1162.
Erdogan et al, "Circularly Symmetric Operation of a Concentric Circle-grating, Surface Emitting, Laser", Appl. Phys. Lett., vol. 60, No. 16, 4/1992, pp. 1921-1923.
AT&T Corp.
Bovernick Rodney B.
Pacher Eugen E.
Sanghavi Hemang
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