Coherent light generators – Particular component circuitry – Optical pumping
Patent
1988-02-11
1989-03-21
Corbin, John K.
Coherent light generators
Particular component circuitry
Optical pumping
350167, 350601, 372 18, 372 44, 372 71, G02B 2744, G02B 508, H01S 3098, H01S 319
Patent
active
048137626
ABSTRACT:
A diffractive lenslet array receives light from multiple lasers. The lenslet array is spaced apart from a partially reflecting mirror by a distance Z=nd.sup.2 /.lambda. where n is an integer or half integer, .lambda. is the laser wavelength and d is the spacing of the lenslets in the array. In a preferred embodiment the apparatus is a unitary design in which the lenslets are etched into one surface of a substrate and a parallel surface is coated to form the partially reflecting mirror. The lenslets abut one another to produce a fill factor (percentage of array containing light) close to one and each of the lenslets is a multistep diffractive lens. Diffractive speading over a round trip distance from lasers to mirror and back again causes feedback light from a single lenslet to couple into adjacent lenslets. The light from all the lenslets is coupled back into the laser waveguides efficiently only when the wavefront at each of the lenslets is flat, that is, when the phase of the feedback is uniform across a lenslet. Uniformity is achieved when the separation between lenslet array and mirror is the Talbot self-imaging condition set forth above.
REFERENCES:
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Leger James R.
Scott Miles L.
Veldkamp Wilfrid B.
Corbin John K.
Edmondson David J.
Massachusetts Institute of Technology
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