CN221507182U - Light-splitting prism assembly and light-splitting system - Google Patents
Light-splitting prism assembly and light-splitting system Download PDFInfo
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- CN221507182U CN221507182U CN202323397299.2U CN202323397299U CN221507182U CN 221507182 U CN221507182 U CN 221507182U CN 202323397299 U CN202323397299 U CN 202323397299U CN 221507182 U CN221507182 U CN 221507182U
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- 230000003287 optical effect Effects 0.000 claims abstract description 49
- 238000002834 transmittance Methods 0.000 claims description 3
- 230000010287 polarization Effects 0.000 description 6
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- 238000004026 adhesive bonding Methods 0.000 description 3
- 239000013307 optical fiber Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
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Abstract
The utility model provides a beam-splitting prism assembly and a beam-splitting system, the beam-splitting prism assembly includes: parallelogram prism, trapezoid prism and beam splitting film; the light splitting film is arranged on the joint surface of the parallelogram prism and the trapezoid prism; the parallelogram prism comprises a parallel and opposite light incident surface and a first light emergent surface, the trapezoid prism comprises a second light emergent surface, and the first light emergent surface and the second light emergent surface are positioned on the same vertical plane; the light beam is perpendicularly incident on the light splitting film from the light incident surface to form a first split light beam and a second split light beam, the first split light beam is emitted from the first light emitting surface to form a first emitting light beam, the second split light beam is emitted from the second light emitting surface to form a second emitting light beam, the first emitting light beam and the second emitting light beam are parallel, and the optical path difference of the first emitting light beam and the optical path difference of the second emitting light beam are the same.
Description
Technical Field
The utility model relates to the field of light splitting, in particular to a light splitting prism assembly and a light splitting system.
Background
Most of the existing light beam splitting schemes adopt a laser coupler, a sensing optical fiber, a polarization beam splitting prism and the like for beam splitting, and the existing light beam splitting schemes have the following defects: 1) The number of the used optical elements is large, and the precision requirement and the environmental requirement on equipment or the optical elements are high; 2) The anti-interference performance is poor, for example, the external vibration greatly affects the light transmission of a laser coupler or a sensing optical fiber, and the final result of an optical path can be greatly affected; 3) Because of external vibration interference or because of polarization direction of light source, there may be a large optical path difference between each beam split light; 4) The multiple beams formed in the same direction after beam splitting are added with other optical elements, so that the cost is high, and more time is consumed in the later light path adjustment; 5) Is sensitive to temperature change, and has larger influence on the light splitting proportion and the optical path difference of the optical element.
Disclosure of utility model
The utility model provides a beam splitting prism assembly and a beam splitting system for stably forming two parallel beams with the same optical path.
The utility model provides a beam-splitting prism assembly, which comprises a parallelogram prism, a trapezoid prism and a beam-splitting film; the light splitting film is arranged on the joint surface of the parallelogram prism and the trapezoid prism; the parallelogram prism comprises a parallel and opposite light incident surface and a first light emergent surface, the trapezoid prism comprises a second light emergent surface, and the first light emergent surface and the second light emergent surface are positioned on the same vertical plane; the light beam is perpendicularly incident on the light splitting film from the light incidence surface to form a first split light beam and a second split light beam, the first split light beam is emitted from the first light emitting surface to form a first emitting light beam, the second split light beam is emitted from the second light emitting surface to form a second emitting light beam, the first emitting light beam and the second emitting light beam are parallel, and the optical path of the first emitting light beam is the same as the optical path of the second emitting light beam.
In one embodiment, the trapezoidal prism is a 45 ° right trapezoid prism, and a right angle face of the right trapezoid prism is glued with the parallelogram prism.
In one embodiment, the interior angles of the parallelogram prisms are two 45 ° and two 135 °.
In an embodiment, the bonding surface further includes an antireflection film, and the light transmittance of the light splitting film is: ratio of reflectance 1:1.
In an embodiment, the first reflective film is disposed on another surface of the parallelogram prism parallel to and opposite to the combining surface.
In an embodiment, the optical lens further comprises a second reflecting film and the third reflecting film, wherein the second reflecting film and the third reflecting film are respectively arranged on the top surface and the bottom surface of the trapezoid prism.
In an embodiment, the parallelogram prism and the trapezoid prism are glued together, and the first light exit surface is polished such that the first light exit surface and the second light exit surface are located on the same vertical plane.
The utility model also provides a light splitting system which comprises the light splitting prism assembly.
In one embodiment, the spectroscopic system comprises: the light-emitting device comprises a shell, wherein the shell comprises a first light-emitting hole and a second light-emitting hole, the first light-emitting hole is opposite to a first light-emitting surface of the beam-splitting prism assembly, and the second light-emitting hole is opposite to a second light-emitting surface.
In an embodiment, the light splitting system includes a light source, where the light source is disposed in the housing, and the light source is configured to provide a light beam, and an incident direction of the light beam is perpendicular to a light incident surface of the light splitting prism assembly.
Compared with the prior art, the utility model provides the beam splitting prism assembly and the beam splitting system, which are characterized in that the parallelogram prism and the trapezoid prism are glued, the light incident surface is arranged on the parallelogram prism, the first light emergent surface which is parallel and opposite to the light incident surface and the second light emergent surface which is positioned on the inclined edge of the trapezoid prism are on the same plane in the vertical direction, the vertically incident light beam can form two parallel light beams with the same direction, and the optical path difference of the two light beams is the same.
The utility model provides a beam splitting prism assembly and a beam splitting system, which have the beneficial effects that:
(1) The parallelogram prism and the trapezoid prism in the optical element needed by the homodromous beam splitting are integrated into one, the parallelogram prism and the trapezoid prism are combined together in a gluing mode, a bonding mode and the like, the process is mature, the integrated device is strong in integrity, the whole device is small in size, and the device can be applied to the application field of the homodromous beam splitting in various narrow spaces;
(2) The polarization of the two split beams can be strictly kept the same as that of the incident light without being related to the polarization in the beam splitting process.
(3) The vibration resistance is strong, when the whole device is subjected to external vibration, the optical path can be changed in the length range of the joint surface of the parallelogram prism and the trapezoid prism, but the optical path difference is unchanged.
(4) The optical fiber has strong thermal stability, and when the environmental temperature of the beam splitting prism component changes, the optical paths of two light beams split in the same direction can not be changed because the parallelogram prism and the trapezoid prism are made of the same material and have the same refractive index temperature coefficient and thermal expansion coefficient.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic side view of a beam splitting prism assembly according to an embodiment of the present utility model.
Fig. 2 is a schematic side view of a spectroscopic system according to an embodiment of the present utility model.
Fig. 3 is a schematic diagram illustrating beam propagation of a spectroscopic system according to an embodiment of the present utility model.
Fig. 4 is a schematic side view of a beam splitting prism assembly according to another embodiment of the present utility model.
Fig. 5 is a schematic side view of a beam splitting prism assembly according to yet another embodiment of the present utility model.
Detailed Description
For a further understanding of the objects, construction, features, and functions of the utility model, reference should be made to the following detailed description of the preferred embodiments.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
The utility model aims to provide a beam splitting prism assembly and a beam splitting system.
As shown in fig. 1 to 3, the beam splitting prism assembly includes: comprises a parallelogram prism 10, a trapezoid prism 20 and a light splitting film 30; the parallelogram prism 10 is connected with the trapezoid prism 20; the light-splitting film 30 is disposed on the joint surface of the parallelogram prism 10 and the trapezoid prism 20; the parallelogram prism 10 comprises a parallel and opposite light incident surface 11 and a first light emergent surface 12, the trapezoid prism 20 comprises a second light emergent surface 21, and the first light emergent surface 12 and the second light emergent surface 21 are positioned on the same vertical plane F; the light beam 201 perpendicularly enters the light splitting film 30 from the light incident surface 11 to form a first split light beam a and a second split light beam b, the first split light beam a is emitted from the first light emitting surface 12 to form a first emitted light beam 202, the second split light beam b is emitted from the second light emitting surface 21 to form a second emitted light beam 203, the first emitted light beam 202 and the second emitted light beam 203 are parallel, and the optical path length of the first emitted light beam 202 is the same as that of the second emitted light beam 203.
In this embodiment, the trapezoidal prism 20 is a 45 ° rectangular trapezoidal prism, and the right-angle surface of the rectangular trapezoidal prism is glued or bonded to the inclined surface of the parallelogram prism 10. Wherein the interior angles α1 and α2 of the parallelogram prism 10 are two 45 ° and two 135 °, the interior angle β1 of the 45 ° right trapezoid prism is 45 °, and the interior angle β2 is a right angle.
With continued reference to fig. 1, the bonding surface further includes an antireflection film, wherein the light transmittance of the light-splitting film 30: ratio of reflectance 1:1, 50% of the incident light beams are reflected on the light splitting film 30 and then emitted out of the parallelogram prism 10, and the other 50% of the light beams are transmitted on the light splitting film 30 and enter the right trapezoid prism to be emitted out, so that parallel emitted light with the same direction is formed.
Referring to fig. 3, a light beam 201 is perpendicularly incident on a light splitting film 30 on a combining surface, an included angle between the light beam 201 and the combining surface is 45 °, based on the principle of total internal reflection, a part of light beam a is reflected on a reflecting surface 13 facing the combining surface of a parallelogram prism 10, the reflecting surface 13 continuously reflects the light beam a to form a first light emergent surface 12 facing parallel to a light incident surface 11 and emergent, so as to form a propagation path of first emergent light 202; the partial light beam b is transmitted from the beam splitting film 30 on the combining surface into the right trapezoid prism, and is incident on the top surface 22 of the right trapezoid prism, the top surface 22 reflects the transmitted light beam b onto the bottom surface 23 of the right trapezoid prism, and the light beam b is reflected by the bottom surface 23 and then is emitted from the hypotenuse of the right trapezoid prism, namely the second light emitting surface 21, so that a propagation path of the second emitted light 203 is formed.
In the present embodiment, since the first light exit surface 12 of the parallelogram prism 10 and the second light exit surface 21 of the right trapezoid prism are on the same vertical plane F, the first light exit surface 12 and the second light exit surface 21 exit vertically, and therefore, the two light exits in parallel and in the same direction, and the optical path difference of the two divided light is the same, calculated as follows:
Assuming that the side length of the light incident surface 11 of the parallelogram prism 10 is l 1, the side length of the reflecting surface 13 is l 2, the side length of the second light emergent surface 21 of the right trapezoid prism is l 3, the light beam 201 perpendicularly enters the light incident surface 11 and then reaches the joint surface of the parallelogram prism 10 and the right trapezoid prism, and the optical path is x at this time, the joint surface between the light incident surface 11 and the parallelogram prism 10 is defined as a first optical path l 1; and defining a second optical path l 2 at the joint surface of the light incident surface 11 to the right trapezoid prism, wherein the optical paths of the first optical path l 1 and the second optical path l 2 are respectively:
l1＝x (1)
l2＝x (2)
The optical path a reflected by the light splitting film 30 of the joint surface is first parallel to the light incident surface 11, so the optical path from the joint surface to the reflecting surface 13 is l 1-1, then reflected by the reflecting surface 13 and emitted perpendicularly to the surface 12, so the optical path from the reflecting surface 13 to the emitting surface 12 is So the total optical path length L a of beam a is:
The optical path b transmitted by the light-splitting film 30 on the joint surface is reflected by the 22 surface to the 23 surface, and the optical path b is parallel to the 12 surface, so the optical path from the 22 surface to the 23 surface is l 1. The first light exit surface 12 of the parallelogram prism 10 and the second light exit surface 21 of the right trapezoid prism are on the same vertical plane F, and according to the geometrical principle, the optical path b from the combining surface to the top surface 22 of the right trapezoid prism and the optical path from the bottom surface 23 to the second light exit surface 21 are equal to the optical path a from the reflecting surface 13 of the parallelogram prism 10 to the first light exit surface 12. The optical path difference between the optical path length L a of the light beam a and the optical path length L b of the light beam b:
La-Lb＝0 (4)
That is, the optical paths of the light beam a and the light beam b split by the splitting film 30 on the coupling surface, which propagate in the first outgoing light 202 and the second outgoing light 203 formed in parallel in the same direction, are the same, and the optical path difference is 0.
As shown in fig. 4, in the beam splitter prism assembly provided in another embodiment of the present utility model, a first reflection film 41 is further included, and the first reflection film 41 is disposed on another reflection surface 13 of the parallelogram prism 10 parallel to and opposite to the combining surface. The first reflective film 41 serves to increase reflection of the light beam a inside the parallelogram prism 10, reducing light leakage.
Further, the top surface 22 and the bottom surface 23 of the rectangular trapezoid prism are respectively provided with a second reflective film 42 and a third reflective film 43, and the second reflective film 42 and the third reflective film 43 are used for increasing the reflection of the light beam b in the rectangular trapezoid prism and reducing light leakage.
As shown in fig. 5, in another embodiment of the present utility model, there is further provided a splitting prism assembly, wherein when the internal angle α3 of the parallelogram prism 10 is less than 45 °, the trapezoid prism 20 is a non-right trapezoid prism, and the internal angle β4 of the bottom of the non-right trapezoid prism is greater than 90 °; or when the internal angle alpha 3 of the parallelogram prism 10 is more than 45 degrees, the trapezoid prism 20 is a non-right trapezoid prism, and the internal angle beta 4 of the bottom of the non-right trapezoid prism is less than 90 degrees.
In this embodiment, the parallelogram prism 10 and the oblique side of the non-right trapezoid prism with smaller inclination are combined, and the light splitting film 30 is disposed on the combining surface of the parallelogram prism 10 and the light incident surface 11, where the parallel and opposite first light emergent surface 12 and the oblique side 21 of the trapezoid prism 20 with larger inclination are on the same vertical plane F, so as to split the incident light beam and obtain two parallel and same-directional emergent light beams.
When the internal angle α3 of the parallelogram prism 10 is smaller than 45 °, the internal angle α4 is larger than 135 °, the internal angle β4 of the bottom of the non-right trapezoid prism is larger than 90 °, and the internal angle β3 of the bottom is smaller than 90 °.
In one embodiment of the present utility model, the parallelogram prism 10 and the right trapezoid prism are glued together, the glued surface thereof is used as the above-mentioned combined surface, and further, after the parallelogram prism 10 and the right trapezoid prism are glued together as a whole, the first light emitting surface 12 and the second light emitting surface 21 of the right trapezoid prism are located on the same vertical plane F by polishing the first light emitting surface 12 parallel and opposite to the parallelogram prism and the light incident surface 11.
The glued connection is for example an optical glue used to fix the junction of the parallelogram prism 10 and the right trapezoid prism.
Referring to fig. 2, the present utility model also provides a spectroscopic system, including: the light source 200 is used for providing a light beam 201, and the incidence direction of the light beam 201 is vertical to the light incidence surface 11 of the light splitting prism assembly; the housing 100 includes a first light exit hole 110 and a second light exit hole 120, the first light exit hole 110 is opposite to the first light exit surface 11 of the dichroic prism assembly, and the second light exit hole 120 is opposite to the second light exit surface 21.
The utility model provides a beam splitting prism assembly and a beam splitting system, which are used for gluing a parallelogram prism and a trapezoid prism, wherein a light incident surface is arranged on the parallelogram prism, a first light emergent surface which is parallel and opposite to the light incident surface and a second light emergent surface which is positioned on the inclined edge of the trapezoid prism are on the same plane in the vertical direction, and vertically incident light beams can form two parallel light beams with the same direction, and the optical path difference of the two light beams is the same.
The utility model provides a beam splitting prism assembly and a beam splitting system, which have the beneficial effects that:
(1) The parallelogram prism and the trapezoid prism in the optical element needed by the homodromous beam splitting are integrated into one, the parallelogram prism and the trapezoid prism are combined together in a gluing mode, a bonding mode and the like, the process is mature, the integrated device is strong in integrity, the whole device is small in size, and the device can be applied to the application field of the homodromous beam splitting in various narrow spaces;
(2) The polarization of the two split beams can be strictly kept the same as that of the incident light without being related to the polarization in the beam splitting process.
(3) The vibration resistance is strong, when the whole device is subjected to external vibration, the optical path can be changed in the length range of the joint surface of the parallelogram prism and the trapezoid prism, but the optical path difference is unchanged.
(4) The optical path difference of two light beams split in the same direction can not be changed because the parallelogram prism and the trapezoid prism are made of the same material and have the same refractive index temperature coefficient and thermal expansion coefficient.
The utility model has been described with respect to the above-described embodiments, however, the above-described embodiments are merely examples of practicing the utility model. In addition, the technical features described above in the different embodiments of the present utility model may be combined with each other as long as they do not collide with each other. It should be noted that the disclosed embodiments do not limit the scope of the utility model. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the utility model.
Claims (10)
1. A beam splitting prism assembly, the beam splitting prism assembly comprising: parallelogram prism, trapezoid prism and beam splitting film; the light splitting film is arranged on the joint surface of the parallelogram prism and the trapezoid prism;
The parallelogram prism comprises a parallel and opposite light incident surface and a first light emergent surface, the trapezoid prism comprises a second light emergent surface, and the first light emergent surface and the second light emergent surface are positioned on the same vertical plane;
The light beam is perpendicularly incident on the light splitting film from the light incidence surface to form a first split light beam and a second split light beam, the first split light beam is emitted from the first light emitting surface to form a first emitting light beam, the second split light beam is emitted from the second light emitting surface to form a second emitting light beam, the first emitting light beam and the second emitting light beam are parallel, and the optical path of the first emitting light beam is the same as the optical path of the second emitting light beam.
2. The splitting prism assembly of claim 1, wherein the trapezoidal prism is a 45 ° right angle trapezoidal prism, and a right angle face of the right angle trapezoidal prism is glued to the parallelogram prism.
3. The splitting prism assembly of claim 2, wherein the interior angles of the parallelogram prisms are two 45 ° and two 135 °.
4. The splitting prism assembly of claim 1, wherein the bonding surface further comprises an antireflection film, the light transmittance of the splitting film: ratio of reflectance 1:1.
5. The splitting prism assembly of claim 1, further comprising a first reflective film disposed on another surface of the parallelogram prism parallel to and opposite the bonding surface.
6. The splitting prism assembly of claim 1 or 5, further comprising a second reflective film and a third reflective film disposed on a top surface and a bottom surface of the trapezoidal prism, respectively.
7. The splitting prism assembly of claim 1, wherein the parallelogram prism and the trapezoid prism are adhesively joined, and the first light exit face is polished such that the first light exit face and the second light exit face lie on the same vertical plane.
8. A spectroscopic system comprising a spectroscopic prism assembly as claimed in any one of claims 1 to 7.
9. The spectroscopic system as set forth in claim 8, wherein the spectroscopic system comprises:
The light-emitting device comprises a shell, wherein the shell comprises a first light-emitting hole and a second light-emitting hole, the first light-emitting hole is opposite to a first light-emitting surface of the beam-splitting prism assembly, and the second light-emitting hole is opposite to a second light-emitting surface.
10. The spectroscopic system as set forth in claim 9 comprising a light source disposed within the housing, the light source configured to provide a light beam having an incident direction perpendicular to a light entrance face of the dichroic prism assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323397299.2U CN221507182U (en) | 2023-12-13 | 2023-12-13 | Light-splitting prism assembly and light-splitting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323397299.2U CN221507182U (en) | 2023-12-13 | 2023-12-13 | Light-splitting prism assembly and light-splitting system |
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| Publication Number | Publication Date |
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| CN221507182U true CN221507182U (en) | 2024-08-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202323397299.2U Active CN221507182U (en) | 2023-12-13 | 2023-12-13 | Light-splitting prism assembly and light-splitting system |
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| CN (1) | CN221507182U (en) |
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- 2023-12-13 CN CN202323397299.2U patent/CN221507182U/en active Active
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