# US 10,310,256 B2 · Aberration correction

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- Number: US 10,310,256 B2
- Document ID: US10310256B2
- Status: Granted
- Kind: B2
- Application number: 15/210,031
- Filed: 2016-07-14
- Published: 2018-01-18
- Granted: 2019-06-04
- Earliest claimed: 2016-07-14
- Assignees: Goodrich Corporation
- Applicants: Goodrich Corporation
- Inventors: James B. Johnson; John Anthony Tejada
- Web page: https://patentgrep.com/patent/US10310256B2

## CPC

- G02B 27/0025: {for optical correction, e.g. distorsion, aberration}
- G02B 23/04: for the purpose of beam splitting or combining, e.g. fitted with eyepieces for more than one observer (G02B23/10 takes precedence)
- G02B 27/1013: {for colour or multispectral image sensors, e.g. splitting an image into monochromatic image components on respective sensors (spectral imaging systems G01J)}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A beamsplitter includes an optical substrate with a first surface configured to receive a beam of multi-spectral light, to reflect a first band of the multi-spectral light and to transmit a second band of the multi-spectral light through the optical substrate to be emitted from a second surface of the optical substrate opposite the first surface. The second surface is a freeform surface. A system includes a telescope configured to focus multi-spectral light into a beam. The system also includes a beamsplitter as described above optically coupled to the telescope so the first surface of the beamsplitter is configured to receive the beam of multi-spectral light from the telescope.

## Claims

### Claim 1

A system comprising:
a telescope configured to focus multi-spectral light into a beam; and
a beamsplitter optically coupled to the telescope, wherein the beamsplitter includes an optical substrate with a first surface configured to receive a beam of multi-spectral light from the telescope, to reflect a first band of the multi-spectral light and to transmit a second band of the multi-spectral light through the optical substrate to be emitted from a second surface of the optical substrate opposite the first surface, wherein the second surface is a freeform surface, further comprising a first imaging sensor optically coupled to receive the first band reflected from the beamsplitter, and a second imaging sensor optically coupled to receive the second band transmitted through the beamsplitter, wherein the telescope is a catadioptric telescope, and wherein there are no non-axiosymmetric aberration components for correction between the beamsplitter and the second image sensor.

### Claim 2 (depends on 1)

A system as recited in claim 1, wherein the freeform surface is configured to mitigate aberration in the second band emitted from the second surface of the optical substrate.

### Claim 3 (depends on 2)

A system as recited in claim 2, wherein the freeform surface is non-axiosymmetric.

### Claim 4 (depends on 1)

A system as recited in claim 1, wherein the first surface is configured to reflect a first band of wavelengths within a range from long wave infrared (LWIR) to visible, inclusive, and to transmit a second band of wavelengths within a range from LWIR to visible, inclusive.

### Claim 5 (depends on 1)

A system as recited in claim 1, further comprising a fold mirror optically coupling the telescope to the beamsplitter.

### Claim 6 (depends on 1)

A system as recited in claim 1, wherein there is a focus after the beamsplitter that is an intermediate image, wherein there are no off-axis components for aberration correction between the beamsplitter and the second imaging sensor.

### Claim 7 (depends on 1)

A system as recited in claim 1, wherein the second imaging sensor is sensitive in an infrared band.

### Claim 8 (depends on 1)

A system as recited in claim 1, wherein an image is formed on the second imaging sensor, wherein the image is free of aberrations.

### Claim 9 (depends on 1)

A system as recited in claim 1, wherein the second imaging sensor is free from non-axiosymmetric aberration components.