Optical amplifier with folded light path and laser-amplifier com

Coherent light generators – Particular resonant cavity

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372 93, 372102, 372 96, 372 20, 372 49, 372 50, 372 69, 372 64, H01S 308

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050881051

ABSTRACT:
An optical amplifier having one or more amplifier regions with a noncollinear light path provided by curved or folded waveguides therein between input, output and reflective surfaces provided, for example, by a low reflectivity front facet and a high reflectivity rear facet. The amplifier regions are electrically pumped via conductive contacts which may be individually addressable for each amplifier region to provide phase control of the array of emitted light. Light is accepted through the front facet by a first amplifier region, is reflected from the rear facet and is emitted through the front facet. If there are multiple amplifier regions, a portion of the light is reflected by the front facet into an adjacent amplifier region. The light path is incident on the front and rear facets at an angle other than normal thereto and preferably at most 10.degree. from normal. The light source may be a laser diode which can be monolithically integrated on the same substrate as the amplifier to form a master oscillator power amplifier (MOPA) device. The laser can be wavelength tunable. The MOPA can also have a steerable output beam.

REFERENCES:
patent: 4713821 (1987-12-01), Bradford et al.
patent: 4744089 (1988-05-01), Montroll et al.
patent: 4751711 (1988-06-01), Welch et al.
patent: 4762735 (1988-08-01), Gregoris et al.
patent: 4876539 (1990-12-01), Carlson et al.
patent: 5003550 (1991-03-01), Welch et al.

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