CN112965153A

CN112965153A - Full-internal reflection polarization-maintaining prism module device based on color combination

Info

Publication number: CN112965153A
Application number: CN202110300723.3A
Authority: CN
Inventors: 曾咏嘉; 刘俊智; 王启平
Original assignee: Tengjing Technology Co ltd
Current assignee: Tengjing Technology Co ltd
Priority date: 2021-03-22
Filing date: 2021-03-22
Publication date: 2021-06-15
Anticipated expiration: 2041-03-22
Also published as: CN112965153B

Abstract

The invention discloses a color-combination-based full internal reflection polarization-preserving prism module device, which comprises: the device comprises a first prism, a second prism, a third prism, a fourth prism, a first high-reflection film, a first dichroic filter film, a second dichroic filter film and a polarization maintaining film; the inclined planes between the four prisms are connected through optical cement or gluing, the connecting surfaces of the prisms are respectively plated with a light combining film and a polarization maintaining film for red, blue and green light, optical cold processing and film coating technologies are adopted to realize the simultaneous polarization maintaining of the red, blue, green and tricolor light after color combining, the structure is compact, the light combining efficiency is high, the manufacturing cost is low, and the polarization maintaining effect is good.

Description

Full-internal reflection polarization-maintaining prism module device based on color combination

Technical Field

The invention belongs to the field of optical technical products, and particularly relates to a color-combination-based full internal reflection polarization-preserving prism module device.

Background

In some optical imaging systems and optical path systems with reflecting prisms, because light is transmitted, especially when incident light is reflected, polarization state phase retardation is generated, as can be known from maxwell' S formula and boundary conditions, when light propagates from an optically dense medium to an optically sparse medium, after an incident angle reaches a full reflection angle, both P-polarized light and S-polarized light generate large phase jump, and the jump variables of the two are different, that is, an additional constant difference is generated in the phase of the S-polarized component and the P-polarized component of the incident light, which results in a change in the polarization state of the outgoing light relative to the incident light, which causes a certain negative effect on the optical imaging system and the like, reduces the imaging definition, and in the optical path system with polarization maintaining requirement, in order to compensate the phase constant difference between S-polarized light and P-polarized light, more components are required, compensating for such additional phase constant differences adds virtually to the cost of manufacture and the difficulty of manufacture.

Therefore, it is a problem of interest for researchers to find a color-combining total internal reflection polarization-maintaining prism module device with low manufacturing cost and good polarization-maintaining effect.

Disclosure of Invention

In order to solve the technical problems, the invention provides a full internal reflection polarization-preserving prism module device based on color combination, inclined planes among four prisms are connected through optical cement or gluing, the connection surfaces of the prisms are respectively plated with a light combination film and a polarization-preserving film for red, blue and green light, optical cold processing and film coating technologies are adopted to realize the simultaneous polarization preservation of the three primary colors of red, blue and green three primary colors after color combination, the structure is compact, the light combination efficiency is high, the manufacturing cost is low, and the polarization-preserving effect is good.

In order to achieve the above object, the present invention provides a full internal reflection polarization maintaining prism module device based on color combination, comprising: the device comprises a first prism, a second prism, a third prism, a fourth prism, a first high-reflection film, a first dichroic filter film, a second dichroic filter film and a polarization maintaining film;

the first prism, the second prism, the third prism and the fourth prism are connected in sequence; the joint of the first prism and the second prism is plated with the first high-reflection film; the first dichroic filter film is plated at the joint of the second prism and the third prism; the joint of the third prism and the fourth prism is plated with the second dichroic filter film, and the surface opposite to the second dichroic filter film (7) and not connected with any prism is also plated with the polarization maintaining film (8).

Preferably, the cross section of the first prism is an isosceles right triangle.

Preferably, the cross sections of the second prism, the third prism and the fourth prism are all rhombic prisms with equal size and internal angles of 45 degrees and 135 degrees respectively.

Preferably, the inclined planes of the first prism, the second prism, the third prism and the fourth prism are connected through optical cement or gluing.

Preferably, the polarization-maintaining film adopts Nb₂O₅、SiO₂The film material is composed of 6 film layers.

Preferably, the polarization-maintaining film adopts TiO₂、SiO₂The film material is composed of 6 film layers.

Preferably, the polarization-maintaining film adopts Ta₂O₅、SiO₂5 film materials and is composed of 11 film layers.

Preferably, the first highly reflective film reflects red light; the first dichroic filter film transmits red light and reflects green light; the second dichroic filter film is transparent to red light and green light and reflective to blue light; the polarization maintaining film maintains polarization of red light, green light and blue light.

Compared with the prior art, the invention has the beneficial effects that:

the inclined planes between the four prisms are connected through optical cement or gluing, the connecting surfaces of the prisms are respectively plated with the light combining film and the polarization maintaining film for red, blue and green light, and optical cold processing and film coating technologies are adopted, so that the three primary colors of red, blue and green can be simultaneously subjected to polarization maintaining after color combining, the structure is compact, the light combining efficiency is high, the manufacturing cost is low, and the polarization maintaining effect is good.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

FIG. 1 is a schematic view of the apparatus of the present invention;

FIG. 2 is a reflectance spectrum of a first highly reflective film of the present invention;

FIG. 3 is a chart of the transmittance spectrum of the first dichroic filter according to the present invention;

FIG. 4 is a chart of the transmittance spectrum of the second dichroic filter according to the present invention;

FIG. 5 is a spectrum showing a phase change of reflected light of tricolor light in example 1 of the present invention;

FIG. 6 is a spectrum showing the phase change of reflected light of tricolor light in example 2 of the present invention;

FIG. 7 is a spectrum showing the phase change of reflected light of tricolor light in example 3 of the present invention;

in the figure: the polarization maintaining film comprises a first prism 1, a second prism 2, a third prism 3, a fourth prism 4, a first high-reflection film 5, a first dichroic filter film 6, a second dichroic filter film 7 and a polarization maintaining film 8.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Example 1

Referring to fig. 1, a schematic diagram of a color-combination total internal reflection polarization-maintaining prism module device structure is shown, wherein R is red light, G is green light, B is blue light, 1 is a first prism, 2 is a second prism, 3 is a third prism, 4 is a fourth prism, a first high reflection film 5 for red light reflection is plated, a first dichroic filter film 6 for red light transmission and green light reflection is plated, a second dichroic filter film 7 for red light transmission and blue light reflection is plated, and a polarization-maintaining film 8 for red light, green light and blue light is plated.

The invention provides a full internal reflection polarization-preserving prism module device based on color combination, which comprises: the device comprises a first prism 1, a second prism 2, a third prism 3, a fourth prism 4, a first high-reflection film 5, a first dichroic filter film 6, a second dichroic filter film 7 and a polarization maintaining film 8;

the section of the first prism 1 is an isosceles right triangle; the cross sections of the second prism 2, the third prism 3 and the fourth prism 4 are rhombic prisms with the same size and the inner angles of 45 degrees and 135 degrees respectively; the first prism 1, the second prism 2, the third prism 3 and the fourth prism 4 are arranged and glued together along the long edges to form the whole color-combination total internal reflection polarization-maintaining prism module.

After each part veneer or optical cement of first prism 1, second prism 2, third prism 3 and fourth prism 4, including a plurality of faces: 1a, 1b, 1c, 2a, 2b, 2c, 2d, 3a, 3b, 3c, 3d, 4a, 4b, 4c, 4d, 5a, 5b, 5 c; interfaces 1b to 2d, 2b to 3d, 3b to 4d and 4b formed by sequentially arranging and gluing prisms are respectively plated with different film systems, the interfaces 1b to 2d are plated with a first high-reflection film 5 for red light, the interfaces 2b to 3d are plated with a first dichroic filter film 6 for reflecting the red light by transmitting green light, the interfaces 3b to 4d are plated with a second dichroic filter film 7 for reflecting the red light by transmitting blue light, and the interface 4b is plated with a polarization maintaining film 8 for the red light, the green light.

The light source that will give red, green, blue light is placed in second prism 2 respectively, third prism 3, directly over the face 2a of fourth prism 4, 3a, 4a, and after three kinds of light emissions got into the prism respectively, red light was incided from face 2a, reflected through first high reflection film 5, after permeating first two direction color filtering membrane 6 and second two direction color filtering membrane 8, with green, the blue closed color in fourth prism 4 after, it is the after 8 total reflections of polarization maintaining membrane again, reflection closed color light was from 4c face outgoing.

The green light enters from the surface 3a, is reflected by the first dichroic filter film 6, is transmitted by the second dichroic filter film 7, is combined with the red and the blue in the fourth prism 4, is totally reflected by the polarization maintaining film 9, and is reflected and combined with the color light to be emitted from the surface 4 c.

Blue light enters from the surface 4a, is reflected by the second dichroic filter film 7, is combined with red and green light in the fourth prism 4, is totally reflected by the polarization maintaining film 8, and is reflected and combined with the light to be emitted from the surface 4 c.

Wherein the first high-reflection film 5 consists of 34 film layers which are respectively used for TiO₂、SiO₂In total, 2 films, 34 films have the following structure: the odd layers being TiO₂Layers, namely a first layer, a third layer, … and a thirty-third layer; even number layer of SiO₂Layers, i.e., the second layer, the fourth layer, …, the thirty-fourth layer; all odd layers and all even layers have the same thickness, i.e. the odd layers of TiO₂The layer thicknesses are all 85.5 nm; even number layer of SiO₂The layer thicknesses were all 136.79 nm.

The first dichroic filter film 6 consists of 28 film layers which are respectively used for TiO₂、SiO₂Totally 2 films, 28 films are sequentially as follows: first layer of TiO₂A film layer with the thickness of 43.59 nm; second layer of SiO₂A film layer with the thickness of 132.15 nm; third layer of TiO₂Layer, 178.42nm thick; fourth layer of SiO₂Layer, thickness 141.64 nm; fifth layer of TiO₂A film layer with the thickness of 60.37 nm; sixth layer of SiO₂A film layer with the thickness of 145.81 nm; seventh layer of TiO₂A layer, 36.74nm thick; eighth layer of SiO₂Layer, thickness 145.5 nm; ninth layer of TiO₂A film layer with the thickness of 185.37 nm; tenth layer of SiO₂A film layer with the thickness of 142.47 nm; the tenth layer of TiO₂Layer, thickness 64.71 nm; twelfth layer of SiO₂Layer, thickness 145.59 nm; a tenth layer of TiO₂A film layer with the thickness of 89.97 nm; fourteenth SiO layer₂A film layer with the thickness of 20.83 nm; the fifteenth layer of TiO₂Layer, thickness 71.03 nm; sixteenth layer of SiO₂Layer, thickness 137.48 nm; seventeenth layer of TiO₂A film layer with the thickness of 69.37 nm; eighteenth SiO layer₂A film layer with the thickness of 77.26 nm; nineteenth layer of TiO₂A layer, thickness 70.74 nm; twentieth layer of SiO₂Layer, thickness 137.74 nm; twenty one layer of TiO₂A film layer with the thickness of 181.06 nm; the second twelve layers of SiO₂A film layer with the thickness of 139.18 nm; twenty third layer of TiO₂A layer of a material selected from the group consisting of,the thickness is 62.72 nm; twenty-fourth layer of SiO₂Layer, thickness 149.18 nm; twenty-fifth layer of TiO₂Layer, thickness 42.82 nm; twenty-sixth layer of SiO₂Layer, thickness 64.44 nm; twenty-seventh layer of TiO₂Layer, thickness 215.26 nm; twenty-eight layers of SiO₂Layer, thickness 142.97 nm.

The second dichroic filter film 7 consists of 28 film layers, which are respectively TiO₂、SiO₂Totally 2 films, 28 films are sequentially as follows: first layer of TiO₂A film layer with the thickness of 162.09 nm; second layer of SiO₂A film layer with the thickness of 40.54 nm; third layer of TiO₂Layer, thickness 64.61 nm; fourth layer of SiO₂A layer, 48.24nm thick; fifth layer of TiO₂A film layer with the thickness of 59.58 nm; sixth layer of SiO₂A film layer with the thickness of 148.88 nm; seventh layer of TiO₂Layer, thickness 12.11 nm; eighth layer of SiO₂Layer, thickness 152.84 nm; ninth layer of TiO₂A film layer with the thickness of 144.54 nm; tenth layer of SiO₂A film layer with the thickness of 124.4 nm; the tenth layer of TiO₂Layer, thickness 42.7 nm; twelfth layer of SiO₂Layer, thickness 120.34 nm; a tenth layer of TiO₂A film layer with the thickness of 23.16 nm; fourteenth SiO layer₂A film layer with the thickness of 138.52 nm; the fifteenth layer of TiO₂Layer, thickness 145.03 nm; sixteenth layer of SiO₂Layer, thickness 125.81 nm; seventeenth layer of TiO₂A film layer with the thickness of 56.91 nm; eighteenth SiO layer₂A film layer with the thickness of 49.92 nm; nineteenth layer of TiO₂Layer, thickness 48.29 nm; twentieth layer of SiO₂Layer, thickness 124.66 nm; twenty one layer of TiO₂A film layer with the thickness of 144.82 nm; the second twelve layers of SiO₂A film layer with the thickness of 116.53 nm; twenty third layer of TiO₂A layer, 61.86nm thick; twenty-fourth layer of SiO₂Layer, thickness 18.83 nm; twenty-fifth layer of TiO₂Layer, thickness 71.49 nm; twenty-sixth layer of SiO₂A layer, thickness 89.43 nm; twenty-seventh layer of TiO₂A layer, 16.95nm thick; twenty-eight layers of SiO₂Layer, thickness 110.74 nm.

In order to verify the technical effect, the invention obtains the transmission rate spectrograms of the first high-reflection film, the first dichroic filter film and the second dichroic filter film shown in fig. 2-4 respectively through specific film material combinations, and as can be seen from fig. 2-4, the first high-reflection film 6 of the invention has more than 99% reflection to red light (650 +/-10 nm); the first dichroic filter film 7 transmits more than 98% of red light and reflects more than 98% of green light (532 +/-10 nm); the second dichroic filter film 8 is more than 98% transparent for green and red light and more than 98% reflective for blue light (440 ± 10 nm).

The polarization maintaining film 8 consists of 6 film layers which are respectively used for Nb₂O₅、SiO₂Totally 2 films, 6 films are sequentially as follows: layer 1 SiO₂A film layer with the thickness of 101.55 nm; second layer Nb₂O₅Film layer, 82.32 nm; third layer of SiO₂A layer, 32.81nm thick; fourth layer Nb₂O₅Layer, thickness 26.53 nm; a fifth SiO2 layer with a thickness of 72.31 nm; sixth layer Nb₂O₅Layer, thickness 7.12 nm.

Example 2

The device structure is the same as that of the embodiment 1, and the differences are that: the polarization maintaining film 8 consists of 6 film layers which are respectively used for TiO₂、SiO₂Totally 2 films, 6 films are sequentially as follows: layer 1 SiO₂A film layer with the thickness of 108.18 nm; second layer of TiO₂Film layer, 71.97 nm; third layer of SiO₂A layer, 32.76nm thick; fourth layer of TiO₂Layer, thickness 27.58 nm; a fifth SiO2 layer with the thickness of 72.79 nm; a sixth layer of TiO₂Layer, thickness 7.65 nm.

Example 3

The device structure is the same as that of the embodiment 1, and the differences are that: the polarization maintaining film 8 consists of 11 film layers which are respectively used for Ta₂O₅、SiO₂Totally 2 films, 11 film thicknesses are as follows in sequence: layer 1 SiO₂A film layer with the thickness of 112.34 nm; second layer Ta₂O₅A film layer with the thickness of 67.97 nm; third layer of SiO₂A layer, 90.20nm thick; a fourth layer of Ta₂O₅A layer, thickness 25.98 nm; fifth layer of SiO₂Layer, thickness 49.80 nm; a sixth layer of Ta₂O₅Layer, thickness 151.59 nm; seventh layer of SiO₂A layer having a thickness of 12.41 nm; the eighth layer Ta₂O₅Layer, thickness164.12 nm; ninth layer of SiO₂Layer, thickness 44.41 nm; a tenth layer of Ta₂O₅Layer, thickness 18.67 nm; eleventh layer of SiO₂Layer, thickness 268.17 nm.

In order to verify the technical effect, the invention uses different film material combinations to calculate three different polarization-maintaining films through film system design software; and testing the phase change of the reflected light of the tricolor light based on the three different polarization-maintaining films to obtain reflected light phase change spectrograms for the tricolor light as shown in figures 5-7. Fig. 5 is a reflected light phase change spectrum of the tricolor light of example 1, fig. 3 is a reflected light phase change spectrum of the tricolor light of example 6, and fig. 7 is a reflected light phase change spectrum of the tricolor light of example 3.

As shown in fig. 5-7, the three embodiments provided by the present invention can keep the polarization state of the total reflected light substantially unchanged after color combination of the three primary colors with the wavelength of 420-680nm, i.e. the polarization state variation ranges are kept within 180 ° ± 1 °, which not only achieves polarization preservation after color combination of RGB three primary colors, but also has excellent polarization preservation effect, low manufacturing cost and low processing difficulty.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.

Claims

1. The utility model provides a full internal reflection polarization maintaining prism module device based on color combination which characterized in that includes: the device comprises a first prism (1), a second prism (2), a third prism (3), a fourth prism (4), a first high-reflection film (5), a first dichroic filter film (6), a second dichroic filter film (7) and a polarization maintaining film (8);

the first prism (1), the second prism (2), the third prism (3) and the fourth prism (4) are connected in sequence; the joint of the first prism (1) and the second prism (2) is plated with the first high-reflection film (5); the joint of the second prism (2) and the third prism (3) is plated with the first dichroic filter coating (6); the joint of the third prism (3) and the fourth prism (4) is plated with the second dichroic filter film (7); the face opposite to the second dichroic filter film (7) not connected to any prism is also coated with the polarization maintaining film (8).

2. The device as claimed in claim 1, wherein the first prism (1) has a cross section of an isosceles right triangle.

3. The color-combination-based full-internal-reflection polarization-preserving prism module device according to claim 1, wherein the cross sections of the second prism (2), the third prism (3) and the fourth prism (4) are all rhombic prisms with equal sizes and internal angles of 45 degrees and 135 degrees respectively.

4. The color-combination-based full-internal-reflection polarization-preserving prism module device according to claim 1, wherein the inclined planes of the first prism (1), the second prism (2), the third prism (3) and the fourth prism (4) are connected through optical cement or glue.

5. The color-combination-based full-internal-reflection polarization-maintaining prism module device as claimed in claim 1, wherein the polarization-maintaining film (8) is Nb₂O₅、SiO₂The film material is composed of 6 film layers.

6. The color-combining and depolarizing dichroic prism based on claim 1The module device is characterized in that the polarization-maintaining film (8) adopts TiO₂、SiO₂The film material is composed of 6 film layers.

7. The device as claimed in claim 1, wherein the polarization maintaining film (8) is Ta₂O₅、SiO₂5 film materials and is composed of 11 film layers.

8. The color-combination-based and depolarizing splitting prism module arrangement according to claim 1, wherein said first highly reflective film (5) reflects red light; the first dichroic filter film (6) transmits red light and reflects green light; the second dichroic filter film (7) is transparent to red and green light and reflective to blue light; the polarization maintaining film (8) maintains polarization for red light, green light and blue light.