Volume holographic grating manufacturing device

Abstract

According to the volume holographic grating manufacturing device provided by the embodiment of the invention, the light emitted by the light source is firstly subjected to parallel processing, and then the light beam is split through the light splitting beam. Therefore, between the light source and the beam splitter, the influence of the air disturbance in the light path on the two beams of coherent light participating in volume holographic grating manufacturing is the same, so that the influence of the air disturbance on a three-dimensional interference field in a holographic plate is reduced. The two beams of coherent light participating in volume holographic grating manufacturing enter the prism after leaving the beam splitter and then directly enter the holographic plate, so that light paths between the beam splitter and the holographic plate are basically in the prism, and the influence of air disturbance on the light beams can be effectively avoided; therefore, the stability of a three-dimensional interference field formed by the holographic plate is ensured.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of volume holographic grating manufacturing, and specifically to a volume holographic grating manufacturing device. Background Art

[0002] In the manufacturing process of volume holographic gratings, in order to ensure that the three-dimensional interference field structure recorded in the photosensitive material is clear, it is crucial to maintain the stability of the recording optical path. Shock absorption, vibration isolation and other measures are usually taken to reduce the interference of external vibrations. In addition, the impact of air disturbances on the interference field is also very obvious, especially when making multiple volume holographic gratings, air disturbances are difficult to completely avoid. For this reason, more stringent shock absorption, vibration isolation and other measures need to be taken, but this will significantly increase the complexity of the grating manufacturing device, increase costs and maintenance difficulties. A convenient method is to let the manufacturing device stand for a period of time and then perform interference recording after the air flow weakens, but this not only affects the manufacturing efficiency of the volume holographic grating, but also brings uncertainty to the quality of the volume holographic grating. Summary of the Invention

[0003] To solve or alleviate the above problems, an embodiment of the present application provides a volume holographic grating manufacturing device, comprising: a light source, an exposure time controller, a beam processor, a beam splitter, a prism, and a holographic dry plate;

[0004] The holographic dry plate is arranged in the prism, and the holographic dry plate is arranged tilted;

[0005] The prism is a polygonal structure, and includes a first surface, a second surface, a third surface, a fourth surface, a fifth surface and a sixth surface;

[0006] After the light source emits light, it passes through the exposure time controller and is processed into a parallel light beam by the beam processor;

[0007] The beam splitter splits the parallel light beam into a first light beam and a second light beam. The first light beam enters the prism through the first surface of the prism, and then enters the holographic dry plate through the first side surface of the holographic dry plate after being totally reflected by the second surface of the prism.

[0008] The second light beam enters the prism through the fourth surface of the prism, and then enters the holographic dry plate through the second side surface of the holographic dry plate after being totally reflected by the fifth surface of the prism. The first light beam and the second light beam interfere at the holographic dry plate to prepare a volume holographic grating.

[0009] The first light beam finally leaves the prism through the third surface of the prism, and the second light beam finally leaves the prism through the sixth surface of the prism.

[0010] As a preferred embodiment of the present application, the first surface and the fourth surface are arranged perpendicularly, and the second surface and the third surface are both arranged obliquely.

[0011] As a preferred embodiment of the present application, the first side surface and the second side surface are arranged opposite to each other.

[0012] As a preferred embodiment of the present application, the first light beam is vertically incident on the prism through the first surface, and the second light beam is vertically incident on the prism through the fourth surface.

[0013] As a preferred embodiment of the present application, the second surface and the third surface are curved structures, so that after converging the first light beam, the first light beam is converted into divergent light.

[0014] As a preferred embodiment of the present application, the first surface and the third surface are curved surfaces, so that after converging the first light beam, the first light beam is converted into divergent light.

[0015] As a preferred embodiment of the present application, the beam processor includes a focusing lens, a filter, and a collimating lens arranged in sequence;

[0016] The light emitted by the light source is processed in sequence by a condenser lens, a filter and a collimator lens to obtain a parallel light beam.

[0017] Compared to existing technologies, the volume holographic grating fabrication device first parallelizes the light emitted by the light source before splitting it using a beam splitter. Therefore, air disturbances in the optical path between the light source and the beam splitter have the same effect on the two coherent light beams involved in volume holographic grating fabrication, thereby reducing the impact of air disturbances on the three-dimensional interference field in the holographic dry plate. Since the two coherent light beams involved in volume holographic grating fabrication enter the prism after leaving the beam splitter and then directly into the holographic dry plate, the optical path between the beam splitter and the holographic dry plate is essentially within the prism, effectively preventing the impact of air disturbances on the light beams and ensuring the stability of the three-dimensional interference field formed by the holographic dry plate.

[0018] In a second aspect, an embodiment of the present application provides a volume holographic grating manufacturing device, comprising: a light source, an exposure time controller, a beam processor, a beam splitter, a prism, and a holographic dry plate;

[0019] The holographic dry plate is arranged in the prism and corresponds to the position of the beam splitter;

[0020] The prism is a polygonal structure, and includes a first surface, a second surface, a third surface, a fourth surface and a seventh surface;

[0021] The light emitted by the light source passes through the exposure time controller and then passes through the beam processor to process the light into a parallel beam;

[0022] The beam splitter splits the parallel light beam into a first light beam and a second light beam, wherein the first light beam enters the prism through the first surface of the prism, and then enters the holographic dry plate through the first side surface of the holographic dry plate after being totally reflected by the second surface of the prism;

[0023] The second light beam enters the prism through a fourth surface of the prism and enters the holographic dry plate through a first side surface of the holographic dry plate, and the first light beam and the second light beam interfere at the holographic dry plate to prepare a volume holographic grating;

[0024] The first light beam finally leaves the prism through the third surface of the prism, and the second light beam finally leaves the prism through the seventh surface of the prism.

[0025] As a preferred embodiment of the present application, the first surface is perpendicular to the fourth surface, the second surface and the third surface are inclined, and the fourth surface and the seventh surface are parallel.

[0026] As a preferred embodiment of the present application, the first side surface of the holographic dry plate is arranged perpendicular to the incident direction of the second light beam.

[0027] Compared with the prior art, the beneficial effects of the volume holographic grating manufacturing device provided in the second aspect are the same as those of the first aspect, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] To more clearly illustrate the embodiments of this application or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely illustrative, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0029] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not intended to limit the conditions under which this application can be implemented, and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in sizes should still fall within the scope of the technical contents disclosed in this application without affecting the efficacy and objectives that can be achieved by this application.

[0030] Figure 1 A light path diagram of a volume holographic grating prepared by the volume holographic grating manufacturing device provided in Example 1 of the present application;

[0031] Figure 2 A light path diagram of a volume holographic grating prepared by the volume holographic grating manufacturing device provided in Example 2 of the present application;

[0032] Figure 3 A light path diagram of a device for manufacturing a volume holographic grating provided in Example 3 of the present application;

[0033] Figure 4 Light path diagram for preparing a volume holographic grating by the volume holographic grating manufacturing device provided in Example 4 of the present application.

[0034] Reference numerals:

[0035] 1-light source; 2-exposure time controller; 3-beam processor; 31-condenser lens; 32-filter; 33-collimating lens; 4-beam splitter; 5-prism; 51-first surface; 52-second surface; 53-third surface; 54-fourth surface; 55-fifth surface; 56-sixth surface; 57-seventh surface; 6-holographic dry plate; 7-first light beam; 8-second light beam. DETAILED DESCRIPTION

[0036] The following specific embodiments illustrate the implementation of this application. Those familiar with the art can easily understand the other advantages and functions of this application from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of this application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0037] Example 1

[0038] like Figure 1 As shown, the volume holographic grating manufacturing device provided in the embodiment of the present application includes a light source 1, an exposure time controller 2, a beam processor 3, a beam splitter 4, a prism 5 and a holographic dry plate 6; in the embodiment of the present application, the exposure time controller 2 is an electronic shutter.

[0039] The holographic dry plate 6 is arranged in the prism 5, and the holographic dry plate 6 is arranged tilted;

[0040] The prism 5 is a polygonal structure, and includes a first surface 51, a second surface 52, a third surface 53, a fourth surface 54, a fifth surface 55 and a sixth surface 56; the first surface 51 is perpendicular to the fourth surface 54, and the second surface 52 and the third surface 53 are both inclined.

[0041] In the embodiment of the present application, the light generated by the light source 1 passes through the exposure time controller 2 and then enters the beam processor 3 in sequence, where the light is converted into a wider parallel beam. The parallel beam is then split into a first beam 7 and a second beam 8 by the beam splitter 4. The first beam 7 enters the prism 5 at a vertical angle through the first surface 51 of the prism 5, is then totally reflected by the second surface 52 of the prism 5, and then enters the holographic dry plate 6 through the first side surface of the holographic dry plate 6 at an angle designed for the volume holographic grating, and finally leaves the prism 5 through the third surface 53 of the prism 5 at a vertical angle; the second beam 8 enters the prism 5 at a vertical angle through the fourth surface 54 of the prism 5, is then totally reflected by the fifth surface 55 of the prism 5, and then enters the holographic dry plate 6 through the second side surface of the holographic dry plate 6 at an angle designed for the volume holographic grating, and finally leaves the beam transmission prism 5 at a vertical angle through the sixth surface 56. The first beam 7 and the second beam 8 interfere at the holographic dry plate 6 to form a volume holographic grating.

[0042] In the embodiment of the present application, the first light beam 7 and the second light beam 8 entering the holographic grating enter through the first side surface and the second side surface of the holographic dry plate 6 , and the first side surface and the second side surface are arranged opposite to each other.

[0043] In the embodiment of the present application, the beam processor 3 includes a focusing lens 31, a filter 32 and a collimating lens 33 arranged in sequence; the light emitted by the light source 1 is processed by the focusing lens 31, the filter 32 and the collimating lens 33 in sequence to obtain a parallel beam.

[0044] In the embodiment of the present application, the first light beam 7 is perpendicularly incident on the prism 5 through the first surface 51, and the second light beam 8 is perpendicularly incident on the prism 5 through the fourth surface 54. Because the first light beam 7 and the second light beam 8 both enter and leave the prism 5 at perpendicular angles, the influence of stray light caused by partial reflection from the surface on the grating manufacturing can be effectively avoided, thereby ensuring that the manufactured volume holographic grating has low stray light and high energy concentration.

[0045] Example 2

[0046] like Figure 2As shown, Example 2 differs from Example 1 in that the second surface 52 and the third surface 53 are curved structures. This allows the first light beam 7 to be converged and then converted into divergent light. The angle between the tangent of the second surface 52 and the incident direction of the first light beam 7 is less than 90 degrees, and the tangent of the third surface 53 is perpendicular to the incident direction of the first light beam 7 after passing through the holographic dry plate 6. Because the first light beam 7 and the second light beam 8 both enter and exit the prism 5 at perpendicular angles, the influence of stray light caused by partial surface reflection on grating fabrication is effectively avoided, thereby ensuring that the fabricated volume holographic grating has low stray light and high energy concentration.

[0047] In the embodiment of the present application, the second surface 52 and the third surface 53 of the prism 5 are curved surfaces, and the remaining surfaces of the prism 5 are planes. The first light beam 7 enters the interior of the prism 5 through the first surface 51 at a vertical angle, and then undergoes total reflection on the second surface 52 and becomes a converging light beam. After converging at a point, the converging light beam becomes divergent light and is incident on the holographic dry plate 6, and then leaves the prism 5 through the third surface 53 at a vertical angle.

[0048] In the embodiment of the present application, the first light beam 7 is specially processed by the second surface 52 and the third surface 53. The transmission process of the second light beam 8 is the same as that in Example 1 and will not be repeated here.

[0049] This embodiment can produce a volume holographic grating formed by interference between parallel light and divergent light.

[0050] Example 3

[0051] like Figure 3 As shown, the difference between Example 3 and Example 1 is that the first surface 51 and the third surface 53 are curved surfaces, so that the first light beam 7 can be converged and then converted into divergent light;

[0052] The tangent line of the first surface 51 is perpendicular to the incident direction of the first light beam 7, and the tangent line of the third surface 53 is perpendicular to the incident direction of the first light beam 7 after passing through the holographic dry plate 6. Because the first light beam 7 and the second light beam 8 both enter and exit the prism 5 at perpendicular angles, the influence of stray light caused by partial reflection from the surface on the grating production can be effectively avoided, thereby ensuring that the produced volume holographic grating has low stray light and high energy concentration.

[0053] In this embodiment, the first surface 51 and the third surface 53 of the prism 5 are curved surfaces, and the remaining surfaces of the prism 5 are planes. The first light beam 7 enters the interior of the prism 5 at a vertical angle through the first surface 51, then undergoes total internal reflection at the second surface 52 and becomes a converging light beam. After converging at a point, the converging light beam becomes divergent light and is incident on the holographic dry plate 6. Finally, it leaves the prism 5 at a vertical angle through the third surface 53.

[0054] In the embodiment of the present application, only the first light beam 7 is processed through the first surface 51 and the third surface 53. The transmission process of the second light beam 8 is the same as that in Example 1 and will not be repeated here.

[0055] This embodiment can produce a volume holographic grating formed by interference between parallel light and divergent light.

[0056] Example 4

[0057] Example 4 differs from Example 1 in that the holographic dry plate 6 is disposed in the prism 5 and corresponds to the position of the beam splitter 4, and the first light beam 7 and the second light beam 8 participating in the interference enter from the same side of the holographic dry plate 6. The prism 5 has a polygonal structure and includes a first surface 51, a second surface 52, a third surface 53, a fourth surface 54, and a seventh surface 57.

[0058] The light source 1 emits light that passes through the exposure time controller 2 and then through the beam processor 3, where the light is processed into a parallel light beam. The beam splitter 4 splits the parallel light beam into a first light beam 7 and a second light beam 8. The first light beam 7 enters the prism 5 through the first surface 51 of the prism 5, and then undergoes total internal reflection at the second surface 52 of the prism 5 before entering the holographic dry plate 6 through the first side surface of the holographic dry plate 6. The second light beam 8 enters the prism 5 through the fourth surface 54 of the prism 5 and enters the holographic dry plate 6 through the first side surface of the holographic dry plate 6. The first light beam 7 and the second light beam 8 interfere at the holographic dry plate 6 to prepare a volume holographic grating. The first light beam 7 finally leaves the prism 5 through the third surface 53 of the prism 5, and the second light beam 8 finally leaves the prism 5 through the seventh surface 57 of the prism 5.

[0059] In the embodiment of the present application, the first surface 51 is perpendicular to the fourth surface 54 , the second surface 52 and the third surface 53 are inclined, and the fourth surface 54 and the seventh surface 57 are parallel.

[0060] In the embodiment of the present application, the first side surface of the holographic dry plate 6 is arranged perpendicular to the incident direction of the second light beam 8. Because the first light beam 7 and the second light beam 8 both enter and exit the prism 5 at perpendicular angles, this effectively prevents the influence of stray light caused by partial reflection from the surface on the grating fabrication, thereby ensuring that the fabricated volume holographic grating has low stray light and high energy concentration.

[0061] This embodiment can produce a volume holographic grating formed by the interference of the first light beam 7 and the second light beam 8 incident from the same side of the holographic dry plate 6.

[0062] In the volume holographic grating fabrication apparatus provided herein, light emitted by light source 1 is first parallelized and then split using a beam splitter. Therefore, air disturbances in the optical path between light source 1 and beam splitter 4 have the same effect on the two coherent light beams involved in volume holographic grating fabrication, thereby reducing the impact of air disturbances on the three-dimensional interference field in holographic dry plate 6. Since the two coherent light beams involved in volume holographic grating fabrication quickly enter prism 5 after leaving beam splitter 4 and then directly enter holographic dry plate 6, the optical path between beam splitter 4 and holographic dry plate 6 is essentially entirely within prism 5, effectively preventing the impact of air disturbances on the light beams and thus ensuring the stability of the three-dimensional interference field formed by holographic dry plate 6.

[0063] Although the present application has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications or improvements may be made based on the present application. Therefore, such modifications or improvements, which do not depart from the spirit of the present application, are within the scope of protection claimed in the present application.

Claims

1. A volume holographic grating manufacturing device, characterized in that: include: Light source, exposure time controller, beam processor, beam splitter, prism and holographic dry plate; The holographic dry plate is arranged in the prism, and the holographic dry plate is arranged tilted; The prism is a polygonal structure, and includes a first surface, a second surface, a third surface, a fourth surface, a fifth surface and a sixth surface; After the light source emits light, it passes through the exposure time controller and is processed into a parallel light beam by the beam processor; The beam splitter splits the parallel light beam into a first light beam and a second light beam. The first light beam enters the prism through the first surface of the prism, and then enters the holographic dry plate through the first side surface of the holographic dry plate after being totally reflected by the second surface of the prism. The second light beam enters the prism through the fourth surface of the prism, and then enters the holographic dry plate through the second side surface of the holographic dry plate after being totally reflected by the fifth surface of the prism. The first light beam and the second light beam interfere at the holographic dry plate to prepare a volume holographic grating. The first light beam finally leaves the prism through the third surface of the prism, and the second light beam finally leaves the prism through the sixth surface of the prism.

2. The volume holographic grating manufacturing device according to claim 1, characterized in that: The first surface and the fourth surface are arranged perpendicularly, and the second surface and the third surface are arranged obliquely.

3. The volume holographic grating manufacturing device according to claim 1, characterized in that: The first side surface and the second side surface are arranged opposite to each other.

4. The volume holographic grating manufacturing device according to any one of claims 1 to 3, characterized in that: The first light beam is vertically incident on the prism through the first surface, and the second light beam is vertically incident on the prism through the fourth surface.

5. The volume holographic grating manufacturing device according to claim 1, characterized in that: The second surface and the third surface are curved structures, so as to convert the first light beam into divergent light after converging the first light beam.

6. The volume holographic grating manufacturing device according to claim 1, characterized in that: The first surface and the third surface are curved surfaces, so as to convert the first light beam into divergent light after converging the first light beam.

7. A volume holographic grating manufacturing device according to any one of claims 1 to 3, 5 and 6, characterized in that: The beam processor includes a focusing lens, a filter and a collimating lens arranged in sequence; The light emitted by the light source is processed in sequence by a condenser lens, a filter and a collimator lens to obtain a parallel light beam.

8. A volume holographic grating manufacturing device, characterized in that: include: Light source, exposure time controller, beam processor, beam splitter, prism and holographic dry plate; The holographic dry plate is arranged in the prism and corresponds to the position of the beam splitter; The prism is a polygonal structure, and includes a first surface, a second surface, a third surface, a fourth surface and a seventh surface; The light emitted by the light source passes through the exposure time controller and then passes through the beam processor to process the light into a parallel beam; The beam splitter splits the parallel light beam into a first light beam and a second light beam, wherein the first light beam enters the prism through the first surface of the prism, and then enters the holographic dry plate through the first side surface of the holographic dry plate after being totally reflected by the second surface of the prism; The second light beam enters the prism through a fourth surface of the prism and enters the holographic dry plate through a first side surface of the holographic dry plate, and the first light beam and the second light beam interfere at the holographic dry plate to prepare a volume holographic grating; The first light beam finally leaves the prism through the third surface of the prism, and the second light beam finally leaves the prism through the seventh surface of the prism.

9. The volume holographic grating manufacturing device according to claim 8, characterized in that: The first surface is perpendicular to the fourth surface, the second surface and the third surface are inclined, and the fourth surface and the seventh surface are parallel.

10. The volume holographic grating manufacturing device according to claim 8, characterized in that: The first side surface of the holographic dry plate is arranged perpendicular to the incident direction of the second light beam.

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