Phase gradient nanocomposite window fabrication and method of fabricating durable optical windows

Patent metadata

Field	Value
Publication number	US-11054549-B2
Application number	US-201715724683-A
Country	US
Kind code	B2
Filing date	Oct 4, 2017
Priority date	Oct 5, 2016
Publication date	Jul 6, 2021
Grant date	Jul 6, 2021

Abstract

An optical window is provided and includes a core layer, a cladding layer and an electromagnetic interference (EMI) layer interposed between the core and cladding layers.

First claim

What is claimed is:

1. An optical window, comprising:
multiple anti-reflection coatings;
an outermost window layer interleaved between an outermost one of the multiple anti-reflection coatings and an outer-intermediate ones of the multiple anti-reflection coatings;
an innermost window layer interleaved between an innermost one of the multiple anti-reflection coatings and an inner-intermediate ones of the multiple anti-reflection coatings; and
an electromagnetic interference (EMI) treatment layer interleaved between the outer-intermediate and inner-intermediate anti-reflection coatings,
wherein an additional anti-reflective coating is interposed between the innermost and inner-intermediate ones of the multiple anti-reflection coatings and the additional anti-reflective coating is displaced from the inner-intermediate one of the multiple anti-reflection coatings to define a thermal management space.

2. The optical window according to claim 1 , wherein the multiple anti-reflection coatings, the outermost and innermost window layers and the EMI treatment layer have a curved shape.

3. The optical window according to claim 1 , wherein the outermost window layer comprises nanocomposite optical ceramic material and the innermost window layer comprises a single phase material.

4. The optical window according to claim 3 , wherein the nanocomposite optical ceramic has distribution gradients of nanocomposite formulations defined in terms of a first axis and a second axis perpendicular to the first axis.

5. The optical window according to claim 1 , wherein a material of the outermost window layer is harder than a material of the innermost window layer.

6. The optical window according to claim 1 , wherein the EMI treatment layer comprises an electrically conductive film.

7. The optical window according to claim 1 , wherein one or more of the multiple anti-reflection coatings respectively comprise a deposited geometric optic coating.

8. The optical window according to claim 1 , further comprising an adhesive layer adjacent to the EMI treatment layer, the adhesive comprising at least one or more of polyethylene, polystyrene, polypropylene, optical glass, paraffin, a thiol and a urethane.

9. An optical window, comprising:
multiple anti-reflection coatings;
an outermost window layer interleaved between an outermost one of the multiple anti-reflection coatings and an outer-intermediate ones of the multiple anti-reflection coatings;
an innermost window layer interleaved between an innermost one of the multiple anti-reflection coatings and an inner-intermediate ones of the multiple anti-reflection coatings; and
an electromagnetic interference (EMI) treatment layer interleaved between the outer-intermediate and inner-intermediate anti-reflection coatings,
wherein the outermost window layer comprises nanocomposite optical ceramic material and has first and second distribution gradients of nanocomposite formulations defined in terms of a first axis and a second axis perpendicular to the first axis, respectively.

10. The optical window according to claim 9 , wherein the multiple anti-reflection coatings, the outermost and innermost window layers and the EMI treatment layer have a curved shape.

11. The optical window according to claim 9 , wherein the innermost window layer comprises a single phase material.

12. The optical window according to claim 9 , wherein the first axis is a central longitudinal axis of the optical window and the second axis is perpendicular to the central longitudinal axis of the optical window.

13. The optical window according to claim 9 , wherein a material of the outermost window layer is harder than a material of the innermost window layer.

14. The optical window according to claim 9 , wherein the EMI treatment layer comprises an electrically conductive film.

15. The optical window according to claim 9 , wherein one or more of the multiple anti-reflection coatings respectively comprise a deposited geometric optic coating.

16. The optical window according to claim 9 , further comprising an adhesive layer adjacent to the EMI treatment layer, the adhesive comprising at least one or more of polyethylene, polystyrene, polypropylene, optical glass, paraffin, a thiol and a urethane.

17. An optical window, comprising:
an outermost window layer interleaved between an outermost anti-reflection coating and an outer-intermediate anti-reflection coatings;
an innermost window layer interleaved between an innermost anti-reflection coating and an inner-intermediate anti-reflection coatings; and
an electromagnetic interference (EMI) treatment layer interleaved between the outer-intermediate and inner-intermediate anti-reflection coatings, wherein:
the outermost window layer comprises nanocomposite optical ceramic material and has first and second distribution gradients of nanocomposite formulations defined in terms of a first axis and a second axis perpendicular to the first axis, respectively, and
an additional anti-reflective coating is interposed between the innermost and inner-intermediate anti-reflection coatings and is displaced from the inner-intermediate anti-reflection coating to define a thermal management space.

Assignees

• Raytheon Co

Inventors

• Trent Catherine
• Frazier Gary A
• Grosse Kyle L

Classifications

• H05K9/009

  comprising electro-conductive fibres, e.g. metal fibres, carbon fibres, metallised textile fibres, electro-conductive mesh, woven, non-woven mat, fleece, cross-linked · CPC title

• H01Q15/0013

  said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective · CPC title

• H01Q1/42

  Housings not intimately mechanically associated with radiating elements, e.g. radome · CPC title

• G02B5/0294

  adapted to provide an additional optical effect, e.g. anti-reflection or filter · CPC title

• G02B5/0221

  the surface having an irregular structure (G02B5/0226 takes precedence) · CPC title