US 4,362,367 AGranted

Miniaturized symmetrization optics for junction laser

AssigneeRCA Corporation

InventorsJacob M. Hammer, Charlie J. Kaiser, Clyde C. Neil

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Abstract

Miniaturized optics comprising transverse and lateral cylindrical lenses composed of millimeter-sized rods with diameters, indices-of-refraction and spacing such that substantially all the light emitted as an asymmetrical beam from the emitting junction of the laser is collected and translated to a symmetrical beam.

Claims5

Dependent claims

Improved symmetrization optics for a junction laser that emits from a surface of its junction layer an asymmetrical light beam that diverges in both the lateral and transverse directions with respect to the junction layer plane of said laser;

said symmetrization optics comprising:
first and second cylindrical rods of respective selected given diameters and axial lengths, said diameters being of the order of millimeters or less;
said first rod being situated at a first selected distance from the emitting junction of said laser in the path of the divergent beam therefrom, with the axial length of said first rod being oriented substantially parallel to the lateral dimension of said junction;
said selected given diameter and axial length of said first rod, as related to said first selected distance, being sufficient for said first rod to collect at least substantially all the emitted light in said divergent beam, whereby said first rod occupies a first volume of space with respect to said junction laser;
said first rod being composed of a material exhibiting a first selected index-of-refraction;
said second rod being situated at a second selected distance, greater than said first selected distance, from the emitting junction of said laser in the path of the divergent output beam from said first rod, with the axial length of said second rod being oriented substantially parallel to the transverse dimention of said junction;
said selected given diameter and axial length of said second rod, as related to said second selected distance, being sufficient for said second rod to collect at least substantially all of the light of the beam emerging from said first rod, whereby said second rod occupies a second volume of space with respect to said junction laser;
said second rod being composed of a material exhibiting a second selected index-of-refraction;
and
wherein the respective selected values of said first and second distances, said first and second indices-of-refraction, and the respective diameters and axial lengths of said first and second rods are such that (1) said first and second volumes of space are mutually exclusive, and (2) said first and second rods cooperate as a lens system to derive a symmetrical cross-section output beam of light from said lens system.

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Dependencies are inferred from the claim text.

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Abstract

said symmetrization optics comprising:
first and second cylindrical rods of respective selected given diameters and axial lengths, said diameters being of the order of millimeters or less;
said first rod being situated at a first selected distance from the emitting junction of said laser in the path of the divergent beam therefrom, with the axial length of said first rod being oriented substantially parallel to the lateral dimension of said junction;
said selected given diameter and axial length of said first rod, as related to said first selected distance, being sufficient for said first rod to collect at least substantially all the emitted light in said divergent beam, whereby said first rod occupies a first volume of space with respect to said junction laser;
said first rod being composed of a material exhibiting a first selected index-of-refraction;
said second rod being situated at a second selected distance, greater than said first selected distance, from the emitting junction of said laser in the path of the divergent output beam from said first rod, with the axial length of said second rod being oriented substantially parallel to the transverse dimention of said junction;
said selected given diameter and axial length of said second rod, as related to said second selected distance, being sufficient for said second rod to collect at least substantially all of the light of the beam emerging from said first rod, whereby said second rod occupies a second volume of space with respect to said junction laser;
said second rod being composed of a material exhibiting a second selected index-of-refraction;
and
wherein the respective selected values of said first and second distances, said first and second indices-of-refraction, and the respective diameters and axial lengths of said first and second rods are such that (1) said first and second volumes of space are mutually exclusive, and (2) said first and second rods cooperate as a lens system to derive a symmetrical cross-section output beam of light from said lens system.

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