Low wave-front error optical filter film

Patent metadata

Field	Value
Publication number	US-12326586-B2
Application number	US-202017760517-A
Country	US
Kind code	B2
Filing date	Aug 17, 2020
Priority date	Sep 20, 2019
Publication date	Jun 10, 2025
Grant date	Jun 10, 2025

Abstract

An optical assembly including a first optical substrate including a first major surface; a multilayer polymeric optical film disposed on the first major surface of the first optical substrate and including a plurality of polymeric layers numbering greater than about 50 in total; and a first optical bonding layer having an average thickness of less than about 0.5 microns and disposed between, and making physical contact to, the first major surface of the first optical substrate and the multilayer polymeric optical film, the first optical bonding layer bonding the first optical substrate to the multilayer polymeric optical film and including a silanated amine.

First claim

What is claimed is:

1. An optical assembly comprising:
a first optical substrate comprising a first major surface;
a multilayer polymeric optical film disposed on the first major surface of the first optical substrate and comprising a plurality of polymeric layers numbering greater than about 50 in total; and
a first optical bonding layer having an average thickness of less than about 0.5 microns and disposed between, and making physical contact to, the first major surface of the first optical substrate and the multilayer polymeric optical film, the first optical bonding layer bonding the first optical substrate to the multilayer polymeric optical film and comprising a silanated amine, wherein the optical assembly has a reflected root mean square wavefront error of less than about 0.75 waves at a wavelength of 0.6328 microns.

2. The optical assembly of claim 1 , wherein the multilayer polymeric optical film comprises a reflective polarizer, such that for substantially normally incident light and for at least one wavelength, the reflective polarizer reflects at least 60% of the incident light having a first polarization state and transmits at least 60% of the incident light having an orthogonal second polarization state.

3. The optical assembly of claim 1 , wherein the multilayer polymeric optical film comprises an optical reflector, such that for substantially normally incident light and for at least one wavelength in a visible wavelength range extending from about 400 nm to about 700 nm, the optical reflector reflects at least 60% of the incident light for each of mutually orthogonal first and second polarization states.

4. The optical assembly of claim 3 , wherein for at least one wavelength in an infrared wavelength range extending from about 750 nm to about 1200 nm, the optical reflector transmits at least 60% of the incident light for each of the first and second polarization states.

5. The optical assembly of claim 1 , wherein the multilayer polymeric optical film comprises an optical reflector, such that for substantially normally incident light and for at least one wavelength in an infrared wavelength range extending from about 750 nm to about 1200 nm, the optical reflector reflects at least 60% of the incident light for at least a first polarization state, and for at least one wavelength in a visible wavelength range extending from about 400 nm to about 700 nm, the optical reflector transmits at least 60% of the incident light for each of the first and an orthogonal second polarization states.

6. The optical assembly of claim 5 , such that for the at least one wavelength in the infrared wavelength range, the optical reflector reflects at least 60% of the incident light for the second polarization state.

7. The optical assembly of claim 1 , wherein the first optical substrate is a prism, and the first major surface is a hypotenuse of the prism.

8. The optical assembly of claim 1 , wherein the first optical substrate is a plane parallel plate comprising opposing first and second planar major surfaces, and the first major surface is the first planar major surface of the plane parallel plate.

9. The optical assembly of claim 1 , wherein the first optical substrate is an optical lens comprising opposing first and second major surfaces at least one of which is curved, and the first major surface is one of the first and second major surfaces of the optical lens.

10. The optical assembly of claim 1 further comprising:
a second optical substrate comprising a first major surface; and
a second optical bonding layer having an average thickness of less than about 0.5 microns and disposed between, and making physical contact to, the first major surface of the second optical substrate and the multilayer polymeric optical film, the second optical bonding layer bonding the second optical substrate to the multilayer polymeric optical film and comprising a silanated amine.

11. A polarizing beam splitter comprising a multilayer polymeric reflective polarizer disposed between first and second optical prisms, an optical bonding layer making physical contact with and bonding the reflective polarizer to each of the first and second optical prisms and having an average thickness less than about 0.2 microns, wherein the polarizing beam splitter has a reflected root mean square wavefront error of less than about 0.75 waves at a wavelength of 0.6328 microns.

12. The polarizing beam splitter of claim 11 , wherein the reflected root mean square wavefront error is less than about 0.5 waves at the wavelength of 0.6328 microns.

13. A polarizing beam splitter comprising:
a multilayer polymeric reflective polarizer disposed between first and second optical prisms and comprising opposing first and second major surfaces;
a first optical bonding layer making physical contact with and bonding the first major surface of the reflective polarizer to the first optical prism; and
a second optical bonding layer making physical contact with and bonding the second major surface of the reflective polarizer to the second optical prism, wherein for light at a wavelength of 0.6328 microns incident on the polarizing beam splitter from each of the first and second major surface sides of the reflective polarizer, the polarizing beam splitter has a reflected root mean square wavefront error of less than about 0.5 waves.

14. The polarizing beam splitter of claim 13 having a transmitted root mean square wavefront error of less than about 0.07 waves at the wavelength of 0.6328 microns.

15. The polarizing beam splitter of claim 11 , wherein the reflected root mean square wavefront error is less than about 0.25 waves at the wavelength of 0.6328 microns.

16. An optical assembly comprising:
a first optical substrate comprising a first major surface;
an optical film disposed on the first major surface of the first optical substrate, such that for substantially normally incident light and for each wavelength in a predetermined wavelength range extending over at least 50 nanometers, the optical film reflects at least 60% of the incident light for at least a first polarization state; and
a first optical bonding layer having an average thickness of less than about 0.5 microns and disposed between, and making physical contact to, the first major surface of the first optical substrate and the optical film, the first optical bonding layer bonding the first optical substrate to the optical film and comprising a silanated amine, and wherein for light at a wavelength of 0.6328 microns incident on the optical film from each major side of the optical film, the optical assembly has a reflected root mean square wave front error of less than about 0.5 waves.

17. The optical assembly of claim 16 , wherein the average thickness of the first optical bonding layer is less than about 0.2 microns.

18. The optical assembly of claim 16 , wherein the optical film comprises a plurality of polymeric layers numbering greater than about 50 in total.

19. The optical assembly of claim 16 , wherein the silanated amine comprises one or more of a 3-aminophenyl trimethoxy silane (APTMS), a 3-aminopropyl trimethoxy silane (APrTMS), a 3-aminopropyl triethyl silane (APrTES), and a 3-aminophenyl triethoxy silane (APTES).

Assignees

• 3M Innovative Properties Company

Inventors

• Le John D
• Saito Kazuta
• Steiner Michael L

Classifications

• G02B27/283

  used for beam splitting or combining · CPC title

• G02B5/305 Primary

  including organic materials, e.g. polymeric layers · CPC title

• G02B5/3041 Primary

  comprising multiple thin layers, e.g. multilayer stacks · CPC title

• G02B5/30 Primary

  Polarising elements (light-modulating devices with active elements G02F1/00) · CPC title