Optical filter comprising a sensor window to provide a transmissivity of less than 5% between approximately 400 nm and approximately 780 nm and a blocker to block transmission at less than approximately 1000 nm

Patent metadata

Field	Value
Publication number	US-12298545-B2
Application number	US-202218047065-A
Country	US
Kind code	B2
Filing date	Oct 17, 2022
Priority date	Mar 13, 2018
Publication date	May 13, 2025
Grant date	May 13, 2025

Abstract

A sensor window may include a substrate and a set of layers disposed onto the substrate. The set of layers may include a first subset of layers of a first refractive index and a second set of layers of a second refractive index different from the first refractive index. The set of layers may be associated with a threshold transmissivity in a sensing spectral range. The set of layers may be configured to a particular color in a visible spectral range and may be associated with a threshold opacity in the visible spectral range.

First claim

What is claimed is:

1. An optical filter, comprising:
a sensor window configured to provide:
a transmissivity of less than 5% between approximately 400 nm and
approximately 780 nm; and
a reflectance of less than 10% in a visible spectral range.

2. The optical filter of claim 1 , wherein the visible spectral range is between approximately 390 nm to approximately 700 nm.

3. The optical filter of claim 1 , wherein the sensor window is a black-colored anti-reflectance sensor window.

4. The optical filter of claim 1 , wherein the sensor window is disposed on a borosilicate substrate.

5. The optical filter of claim 1 , wherein the sensor window is configured for a spectral range centered at 1550 nm.

6. The optical filter of claim 1 , wherein the transmissivity of less than 5% between approximately 400 nm and approximately 780 nm is at an angle of incidence from approximately 0 degrees to approximately 45 degrees.

7. The optical filter of claim 1 , wherein the transmissivity is greater than 95% at approximately 1550 nm.

8. The optical filter of claim 1 , wherein the reflectance of less than 10% in the visible spectral range is at an angle of incidence from approximately 0 degrees to approximately 45 degrees.

9. An optical filter, comprising:
a sensor window configured to provide:
a transmissivity of less than 50% between approximately 400 nm and
approximately 850 nm and is greater than 95% at approximately 940 nm; and
a reflectance of less than 10% in a visible spectral range.

10. The optical filter of claim 9 , wherein the sensor window is configured for a spectral range centered at 940 nm.

11. The optical filter of claim 9 , wherein the visible spectral range is approximately 390 nm to approximately 650 nm.

12. The optical filter of claim 9 , wherein the reflectance of less than 10% in the visible spectral range is at an angle of incidence from approximately 0 degrees to approximately 45 degrees.

13. The optical filter of claim 9 , wherein the sensor window is a black-colored anti-reflectance sensor window.

14. The optical filter of claim 9 , wherein the sensor window is configured to be black at angles of incidence from approximately 0 degrees to approximately 45 degrees.

15. An optical filter, comprising:
a sensor window configured to provide:
a transmissivity of less than 50% between approximately 400 nm and
approximately 800 nm and is greater than 85% at approximately 940 nm; and
a reflectance of less than 12% in a part of a visible spectral range.

16. The optical filter of claim 15 , wherein the sensor window is a red-colored anti-reflectance sensor window.

17. The optical filter of claim 15 , wherein the sensor window is configured for a spectral range centered at 940 nm.

18. The optical filter of claim 15 , wherein the part of the visible spectral range is approximately 390 nm to approximately 590 nm.

19. The optical filter of claim 15 , wherein the reflectance is greater than 12% in a different part of the visible spectral range.

20. The optical filter of claim 19 , wherein the different part of the visible spectral range is approximately 590 nm to approximately 700 nm.

Assignees

• Viavi Solutions Inc

Inventors

• Ockenfuss Georg J
• Rowlands Scott
• Bilger Markus

Classifications

• G01J1/0488

  with spectral filtering · CPC title

• G01J1/4228

  arrangements with two or more detectors, e.g. for sensitivity compensation · CPC title

• G02B5/285

  comprising deposited thin solid films (G02B5/281 - G02B5/289 take precedence; multilayered film filters for fibre optic multiplexing G02B6/29361) · CPC title

• G01J2003/2826

  Multispectral imaging, e.g. filter imaging · CPC title

• G01J2003/1239

  and separate detectors · CPC title