CN112578573B - Portable free space quantum communication optical axis calibration system - Google Patents
Portable free space quantum communication optical axis calibration system Download PDFInfo
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- CN112578573B CN112578573B CN202110202383.0A CN202110202383A CN112578573B CN 112578573 B CN112578573 B CN 112578573B CN 202110202383 A CN202110202383 A CN 202110202383A CN 112578573 B CN112578573 B CN 112578573B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/30—Collimators
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
- G02B17/0804—Catadioptric systems using two curved mirrors
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
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Abstract
The application provides a portable free space quantum communication optical axis calibration optical system, which relates to the technical field of quantum communication, and comprises a secondary arrangement protection window, a pre-calibration group, a target, an annular light source, a dichroic spectroscope, a beacon light imaging group and a communication light imaging group; the communication light incident through the protection window sequentially passes through the calibration front group, the target, the annular light source, the dichroic beam splitter and the communication light imaging group, and is imaged in the communication light imaging group; beacon light entering through the protection window sequentially passes through the calibration front group, the target, the annular light source, the dichroic beam splitter and the beacon light imaging group and is imaged in the beacon light imaging group; the broad spectrum light emitted by the annular light source sequentially passes through the target, the calibration front group and the protection window. The technical scheme of this application has reduced free space quantum communication optical axis calbiration system volume, portable, and be applicable to various field work environment.
Description
Technical Field
The application relates to the technical field of quantum communication, in particular to a portable free space quantum communication optical axis calibration system.
Background
Quantum communication technologies are classified into optical fiber quantum communication and free space quantum communication due to differences in transmission channels. The precondition for building the optical fiber quantum communication system at present is that an optical fiber link needs to be built, global development of the quantum communication system is limited, communication requirements of mobile end users cannot be met, the building of the communication link cannot be completed quickly, the quantum communication system based on the optical fiber faces a development bottleneck, and advantages of flexibility and changeability of free space quantum communication, dynamic networking and the like are considered to be a better choice for realizing a global quantum communication network.
The free space quantum communication system strictly requires that the optical axis of the beacon light, the optical axis of the beacon light and the optical axis of the communication light are parallel to each other, otherwise, the optical axis of the communication light deviates from the receiving end, so that the receiving efficiency of the communication light of the receiving end is reduced, even the communication light cannot be received, and further communication failure is caused. Therefore, it is necessary to calibrate the parallelism of the beacon light emission optical axis, the beacon light reception optical axis, and the communication light optical axis of the prototype to be calibrated.
The existing optical axis parallelism calibration system is an indoor-based large-aperture collimator system, on one hand, the system needs to use a camera as a reference, the requirement on system installation and adjustment is high, and the camera is easily interfered to change in actual use, so that the calibration precision is not high; on the other hand, the system has a large volume, and the optical axis calibration of the transmitting and receiving optical system can be realized only by replacing the target, the light source and the camera assembly for many times in the optical axis calibration process, so that the operation is troublesome; in addition, the system is only suitable for indoor calibration and is not suitable for field working environment.
Disclosure of Invention
The application provides a portable free space quantum communication optical axis calibration optical system to solve the problem that free space quantum communication optical axis calibration system is not suitable for field work.
A portable free space quantum communication optical axis calibration system comprises a protection window, a pre-calibration group, a target, an annular light source, a dichroic spectroscope, a beacon light imaging group and a communication light imaging group; the protection window, the pre-calibration group, the target, the annular light source and the dichroic spectroscope are sequentially arranged; the communication light entering through the protection window sequentially passes through the pre-calibration group, the target, the annular light source, the dichroic beam splitter and the communication light imaging group and is imaged in the communication light imaging group; the beacon light entering through the protection window sequentially passes through the pre-calibration group, the target, the annular light source, the dichroic beam splitter and the beacon light imaging group and is imaged in the beacon light imaging group; the broad spectrum light emitted by the annular light source passes through the target, the calibration front group and the protection window in sequence.
Preferably, the protection window is flat glass, the inclination angle range of the protection window relative to the vertical direction is 3-10 degrees, the outer diameter of the protection window is 65mm, and the central transverse thickness of the protection window is 6 mm.
Preferably, the pre-calibration set comprises a cassegrain reflective objective lens set and a wide-spectrum imaging set; the Cassegrain reflective objective lens group comprises a paraboloid main reflecting mirror and a hyperboloid secondary reflecting mirror, wherein the paraboloid main reflecting mirror comprises a first quadric surface, the hyperboloid secondary reflecting mirror comprises a second quadric surface, the outer diameter of the paraboloid main reflecting mirror is 55mm, the curvature radius of the first quadric surface is-146.1 mm, the constant of the first quadric surface is-1, the central transverse thickness is 6.277mm, the outer diameter of the hyperboloid secondary reflecting mirror is 17mm, the curvature radius of the second quadric surface is 48.94mm, the constant of the second quadric surface is-2.9, and the central transverse thickness is 4 mm; the wide-spectrum imaging group comprises a first wide-spectrum imaging lens, a second wide-spectrum imaging lens and a third wide-spectrum imaging lens, the first wide-spectrum imaging lens is a negative meniscus wide-spectrum positive lens, the second wide-spectrum imaging lens is a negative meniscus high-refractive-index wide-spectrum negative lens, the third wide-spectrum imaging lens is a negative meniscus wide-spectrum negative lens, the outer diameter of the first wide-spectrum imaging lens is 13mm, the curvature radius of a concave surface is-30.41 mm, the curvature radius of a convex surface is-27.73 mm, the central transverse thickness is 6mm, the outer diameter of the second wide-spectrum imaging lens is 13mm, the curvature radius of a concave surface is-14.66 mm, the curvature radius of a convex surface is-19.06 mm, the central transverse thickness is 2.5mm, the outer diameter of the third wide-spectrum imaging lens is 13mm, the curvature radius of a concave surface is-12.53 mm, the curvature radius of a convex surface is-17.46 mm, and the third wide-spectrum imaging lens is formed by, The central transverse thickness is 6 mm; the hyperboloid secondary reflector, the first wide-spectrum imaging lens, the paraboloidal main reflector, the second wide-spectrum imaging lens and the third wide-spectrum imaging lens are sequentially arranged and have coaxial centers, the center distance between the hyperboloid secondary reflector and the first wide-spectrum imaging lens is 42mm, the center distance between the first wide-spectrum imaging lens and the paraboloidal main reflector is 6.7mm, the center distance between the paraboloidal main reflector and the second wide-spectrum imaging lens is 4.5mm, and the center distance between the second wide-spectrum imaging lens and the third wide-spectrum imaging lens is 2 mm.
Preferably, the beacon light imaging group comprises a first beacon light focusing lens, a second beacon light focusing lens, a third beacon light focusing lens, a fourth beacon light focusing lens, a first turning mirror, a first beacon light imaging lens, a second beacon light imaging lens, a third beacon light imaging lens and a beacon light imaging focal plane; the first beacon light focusing lens is a biconvex lanthanum flint positive lens, the second beacon light focusing lens is a biconvex fluorine crown positive lens, the third beacon light focusing lens is a biconcave heavy flint negative lens, the fourth beacon light focusing lens is a plano-convex barium crown positive lens, the first turning reflector adopts a high-precision surface type optical material, the first beacon light imaging lens is a biconvex lanthanum crown positive lens, the second beacon light imaging lens is a positive meniscus lanthanum flint negative lens, and the third beacon light imaging lens is a negative meniscus heavy flint negative lens; the external diameter of first beacon light focusing lens is 21mm, is 48.31mm along the first convex surface radius of curvature of light path direction in proper order, and second convex surface radius of curvature is-37.33 mm, the horizontal thickness in center is 4.4mm, the external diameter of second beacon light focusing lens is 19mm, is 16.67mm along the first convex surface radius of curvature of light path direction in proper order, and second convex surface radius of curvature is-32.28 mm, the horizontal thickness in center is 6mm, the external diameter of third beacon light focusing lens is 19mm, is-32.28 mm along the first concave surface radius of curvature of light path direction in proper order, and second concave surface radius of curvature is 11.52mm, the horizontal thickness in center is 2.6mm, the external diameter of fourth beacon light focusing lens is 19mm, is 16.44mm along light path direction convex surface radius of curvature in proper order, the horizontal thickness in center is 5mm, the external diameter of first refraction speculum is 15mm, the horizontal thickness in center is 2mm, the outer diameter of the first beacon light imaging lens is 13mm, the first convex curvature radius is 19.06mm, the second convex curvature radius is-74.64 mm and the central transverse thickness is 3.2mm along the light path direction in sequence, the outer diameter of the second beacon light imaging lens is 13mm, the convex curvature radius is 11.46mm, the concave curvature radius is 8.13mm and the central transverse thickness is 6mm along the light path direction in sequence, the outer diameter of the third beacon light imaging lens is 13mm, the concave curvature radius is-9.12 mm, the convex curvature radius is-30.2 mm and the central transverse thickness is 6mm along the light path direction in sequence; first beacon light focusing lens with the centre-to-centre spacing between the second beacon light focusing lens is 3.6mm, second beacon light focusing lens with third beacon light focusing lens glues each other, third beacon light focusing lens with the centre-to-centre spacing between the fourth beacon light focusing lens is 1.5mm, fourth beacon light focusing lens with the centre-to-centre spacing between the first reflector of turning is 10.6mm, first reflector of turning with the centre-to-centre spacing between the first beacon light imaging lens is 22mm, first beacon light imaging lens with the centre-to-centre spacing between the second beacon light imaging lens is 0.5mm, second beacon light imaging lens with the centre-to-centre spacing between the third beacon light imaging lens is 2.5mm, third beacon light imaging lens with the centre-to-centre spacing between the beacon light imaging focal plane is 14 mm.
Preferably, the communication light imaging group comprises a first communication light focusing lens, a second communication light focusing lens, a third communication light focusing lens, a first communication light imaging lens, a second turning reflector, a second communication light imaging lens, a third turning reflector and a communication light imaging focal plane; the first communication light focusing lens is a negative meniscus low-hardness deformation aspheric positive lens, the second communication light focusing lens is a biconvex heavy flint positive lens, the third communication light focusing lens is a positive meniscus crown positive lens, the first communication light imaging lens is a positive meniscus lanthanum flint positive lens, the second turning reflector is a high-precision surface type optical material, the second communication light imaging lens is a negative meniscus lanthanum flint positive lens, and the third turning reflector is a high-precision surface type optical material; the first communication light focusing lens is 20mm in outer diameter, the X-axis direction curvature radius of the deformed aspheric surface is-207.65 mm, the Y-axis direction curvature radius of the deformed aspheric surface is-205.17 mm, the convex surface curvature radius is-61.99 mm, and the center transverse thickness is 3mm, the second communication light focusing lens is 20mm in outer diameter, the first convex surface curvature radius is 66.85mm, the second convex surface curvature radius is-424.76 mm, and the center transverse thickness is 3.26mm, the third communication light focusing lens is 20mm in outer diameter, the convex surface curvature radius is 37.48mm, the concave surface curvature radius is 105.28mm, and the center transverse thickness is 3.25mm, the first communication light imaging lens is 16mm in outer diameter, the convex surface curvature radius is 19.98mm, the concave surface curvature radius is 25.77mm, and the center transverse thickness is 5mm, the second turning reflector is 16mm in outer diameter and 2mm in central transverse thickness, the second communication light imaging lens is 9mm in outer diameter, the concave curvature radius is-11.12 mm, the convex curvature radius is-10.92 mm and the central transverse thickness is 5mm in sequence along the light path direction, and the third turning reflector is 21mm in outer diameter and 3mm in central transverse thickness; first communication light focusing lens with the centre-to-centre spacing between the second communication light focusing lens is 0.6mm, the second communication light focusing lens with the centre-to-centre spacing between the third communication light focusing lens is 0.5mm, the third communication light focusing lens with the centre-to-centre spacing between the first communication light imaging lens is 9.6mm, first communication light imaging lens with the centre-to-centre spacing between the second reflection mirror is 10.43mm, the second reflection mirror that turns over with the centre-to-centre spacing between the second communication light imaging lens is 12mm, the second communication light imaging lens with the centre-to-centre spacing between the third reflection mirror that turns over is 12.24mm, the third reflection mirror that turns over with the centre-to-centre spacing between the communication light imaging focal plane is 15 mm.
Preferably, the center-to-center distance between the protection window and the pre-calibration set is 10mm, the center-to-center distance between the pre-calibration set and the target is 5.92mm, the center-to-center distance between the target and the ring-shaped light source is 2.32mm, the center-to-center distance between the ring-shaped light source and the dichroic beam splitter is 9.68mm, the center-to-center distance between the dichroic beam splitter and the beacon light imaging set is 14mm, and the center-to-center distance between the dichroic beam splitter and the communication light imaging set is 15 mm.
Preferably, the dichroic beam splitter comprises a first surface and a second surface which are opposite, the first surface is plated with a spectrum splitting film, and the second surface is plated with an antireflection film; the dichroic beam splitter has an outer diameter of 26mm and a central transverse thickness of 1 mm.
Preferably, the target is an annular target having an inner diameter of 0.8mm and an outer diameter of 16 mm.
Preferably, the annular light source has an inner diameter of 16mm, an outer diameter of 22mm and a central transverse thickness of 1 mm.
Preferably, the parabolic primary reflector is provided with a primary reflector hood, the hyperbolic secondary reflector is provided with a secondary reflector hood, and the first wide-spectrum imaging lens is arranged in the primary reflector hood.
According to the technical scheme, the portable free-space quantum communication optical axis calibration system is provided, on one hand, compared with an indoor large-aperture collimator system, the portable free-space quantum communication optical axis calibration system is small in size, comprehensive in function, convenient to carry and suitable for field-level calibration of various field working environments, and the optical axis calibration of a transmitting optical system and a receiving optical system can be realized without replacing components; on the other hand, the calibration optical system only takes the target as a reference, has strong anti-interference capability and lower installation and adjustment requirements on the calibration optical system, and has higher calibration precision; in addition, for traditional optical axis calbiration system, the portable optical axis calbiration system of this application can cooperate and have automatically controlled optical axis adjusting part by the full automatic calibration of calibration model machine realization one-button, need not artifical the participation.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic cross-sectional structural diagram of a portable free-space quantum communication optical axis calibration system according to the present application.
Fig. 2 is a schematic view of a partial optical path structure of the portable free-space quantum communication optical axis calibration system according to the present application.
Detailed Description
The technical solutions of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments, it should be understood that these embodiments are merely illustrative of the present invention and are not intended to limit the scope of the present invention, and various equivalent modifications of the present invention by those skilled in the art after reading the present invention fall within the scope of the appended claims.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The invention provides a portable free space quantum communication optical axis calibration system, which is suitable for field-level calibration in various field working environments and has higher calibration precision.
Fig. 1 is the sectional structure schematic diagram of this application portable free space quantum communication optical axis calbiration system, and fig. 2 is this application portable free space quantum communication optical axis calbiration system part light path structure schematic diagram, and it is shown with reference to fig. 1 and fig. 2, the system includes protection window 1, group, target 7, annular light source 26, dichroic spectroscope 8 before the calibration, beacon light imaging group, communication light imaging group, and protection window 1, group, target 7, annular light source 26, dichroic spectroscope 8 arrange in proper order before the calibration. The communication light incident through the protection window 1 sequentially passes through the calibration front group, the target 7, the annular light source 26, the dichroic beam splitter 8 and the communication light imaging group, and is imaged in the communication light imaging group to calibrate the parallelism of the optical axes of the communication light; the beacon light incident through the protection window 1 sequentially passes through the calibration front group, the target 7, the annular light source 26, the dichroic beam splitter 8 and the beacon light imaging group, and is imaged in the beacon light imaging group, so that the parallelism of the beacon light emission optical axis is calibrated; the broad spectrum light emitted by the annular light source 26 sequentially passes through the target 7, the calibration front group and the protection window 1, and the light in a specific spectrum range, namely the beacon light, is received and imaged by the calibration prototype, so that the parallelism of the light receiving optical axis of the beacon light can be calibrated.
The specific working steps have various implementation modes:
in embodiment 1, with the optical axis of communication light as a reference, turning on an annular light source 26, illuminating a target 7, emitting parallel communication light by a calibrated prototype, receiving the parallel communication light by the system, allowing the communication light incident through a protection window 1 to sequentially pass through a pre-calibration group, the target 7, the annular light source 26, a dichroic beam splitter 8 and a communication light imaging group, imaging on a communication light imaging focal plane 25 in the communication light imaging group, receiving the position of the communication light focused on the target 7 through the communication light imaging focal plane 25, and rotating the calibration system and/or adjusting the attitude angle and/or the optical axis adjusting mechanism of the communication light of the calibrated prototype to make the center of the communication light imaging spot coincide with the center of the target; beacon light parallel light is emitted by a calibrated prototype, received by the system, and the beacon light incident through a protection window 1 sequentially passes through a calibration front group, a target 7, an annular light source 26, a dichroic spectroscope 8 and a beacon light imaging group, is imaged on a beacon light imaging focal plane 17 in the beacon light imaging group, the position of a beacon light imaging light spot on the target 7 is received through the beacon light imaging focal plane 17, and the beacon light imaging light spot center is coincided with the target center position by adjusting a beacon light emission optical axis adjusting mechanism of the calibrated prototype so as to calibrate the parallelism between the beacon light emission optical axis and a communication light optical axis of the calibrated prototype; the broad spectrum light emitted by the annular light source 26 sequentially passes through the target 7, the calibration front group and the protection window 1 and is received by the calibrated prototype, the calibrated prototype can filter out light signals in an unnecessary spectral range and reserve light in a beacon light spectral range, therefore, an image of the target 7 can be received through an imaging focal plane of a beacon light receiving camera of the calibrated prototype, and the beacon light receiving optical axis adjusting mechanism of the calibrated prototype is adjusted to enable the center of the beacon light imaging focal plane of the calibrated prototype to coincide with the center of the target so as to calibrate the parallelism between the beacon light receiving optical axis of the calibrated prototype and the beacon light emitting optical axis and the communication light optical axis.
Similarly, the beacon light receiving optical axis of the calibration prototype can be used as a reference, and the operation steps in embodiment 2 are similar.
In the above embodiments, the detailed structure and parameter settings of the optical axis calibration system of the present application are as follows:
the outer diameter of the lens refers to the maximum vertical cross-sectional diameter of the lens when in the vertical state, and the central lateral thickness of the lens refers to the central distance between the two mirror surfaces on the lens in the optical path direction. Referring to fig. 1 and 2, a protection window 1 is made of a flat glass and is made of a wide-spectrum optical material; the inclination angle range of the protection window 1 relative to the vertical direction is 3-10 degrees, so that the influence of stray light reflected by the surface of the protection window 1 can be prevented, and the protection window is used for protecting and sealing a calibration system under the condition of an external field complex environment; the outer diameter of the protection window 1 is 65mm and the central transverse thickness is 6 mm.
In the present application, the center-to-center distance between the lenses means an interval between the two lenses in the direction of the central axis, that is, an air gap. In this application, the radius of curvature of lens has the positive negative fraction, wherein, follows the light path trend, and the radius of curvature of convex surface is positive, and the radius of curvature of concave surface is negative. In the present application, a negative meniscus lens refers to a lens whose mirror surface is concave along the direction of the optical path, a positive meniscus lens refers to a lens whose mirror surface is convex along the direction of the optical path, a positive lens refers to a lens whose focal power is positive, and a negative lens refers to a lens whose focal power is negative. The pre-calibration set comprises a Cassegrain reflective objective lens set and a wide-spectrum imaging set. The Cassegrain reflective objective lens group comprises a paraboloidal main reflecting mirror 2 and a hyperboloid secondary reflecting mirror 3, and is used for converging large-caliber light beams in an extremely short distance; the paraboloid main reflector 2 is made of optical materials with low thermal expansion coefficients, and the hyperboloid secondary reflector 3 is made of optical materials with low thermal expansion coefficients; the parabolic main reflector 2 includes a first quadric surface, the hyperboloid sub-reflector 3 includes a second quadric surface, the outer diameter of the parabolic main reflector 2 is 55mm, the radius of curvature of the first quadric surface is-146.1 mm, the first quadric surface constant is-1, the central transverse thickness is 6.277mm, the outer diameter of the hyperboloid sub-reflector 3 is 17mm, the radius of curvature of the second quadric surface is 48.94mm, the second quadric surface constant is-2.9, and the central transverse thickness is 4 mm. The paraboloid main reflector 2 is provided with a main reflector hood, the hyperboloid secondary reflector 3 is provided with a secondary reflector hood, and the main reflector hood and the secondary reflector hood are arranged oppositely and used for eliminating stray light of the Cassegrain reflective objective lens group, preventing abnormal light from entering an imaging system and improving the anti-interference performance of the system. The wide-spectrum imaging group comprises a first wide-spectrum imaging lens 4, a second wide-spectrum imaging lens 5 and a third wide-spectrum imaging lens 6, is used for focusing wide-spectrum light rays converged by the Cassegrain reflective objective lens group on a target 7, is designed aiming at wide-spectrum wave bands, and has a certain field range. The first wide-spectrum imaging lens 4 is a negative meniscus wide-spectrum positive lens, the second wide-spectrum imaging lens 5 is a negative meniscus high-refractive-index wide-spectrum negative lens, the third wide-spectrum imaging lens 6 is a negative meniscus wide-spectrum negative lens, the first wide-spectrum imaging lens 4 is arranged in a primary mirror hood, the outer diameter of the first wide-spectrum imaging lens 4 is 13mm, the radius of curvature of a concave surface is-30.41 mm, the radius of curvature of a convex surface is-27.73 mm, and the central transverse thickness is 6mm, the outer diameter of the second wide-spectrum imaging lens 5 is 13mm, the radius of curvature of a concave surface is-14.66 mm, the radius of curvature of a convex surface is-19.06 mm, and the central transverse thickness is 2.5mm, the outer diameter of the third wide-spectrum imaging lens 6 is 13mm, the radius of curvature of a concave surface is-12.53 mm, the radius of curvature of a convex surface is-17.46 mm, and the central transverse; the hyperboloid secondary reflector 3, the first wide-spectrum imaging lens 4, the paraboloidal main reflector 2, the second wide-spectrum imaging lens 5 and the third wide-spectrum imaging lens 6 are sequentially arranged and have coaxial centers, the center distance between the hyperboloid secondary reflector 3 and the first wide-spectrum imaging lens 4 is 42mm, the center distance between the first wide-spectrum imaging lens 4 and the paraboloidal main reflector 2 is 6.7mm, the center distance between the paraboloidal main reflector 2 and the second wide-spectrum imaging lens 5 is 4.5mm, and the center distance between the second wide-spectrum imaging lens 5 and the third wide-spectrum imaging lens 6 is 2 mm.
The target 7 is an annular target, that is, the center of the target 7 is a circular through hole, and the inner diameter of the annular target is 0.8mm and the outer diameter is 16 mm. The target 7 is used as a reference for optical axis calibration, plays a role of focusing an image surface for the light beam emitted by the calibrated prototype, and simultaneously serves as a middle imaging point of the optical axis calibration system, and plays a role of emitting an object surface for calibrating the receiving optical axis of the calibrated prototype. In addition, in order to improve the optical axis positioning accuracy and the target focusing speed of the target, the annular target 7 may be provided with a positioning hole and a focusing hole, wherein the positioning hole is used for providing an optical axis position reference, and the focusing hole is used for realizing the rapid and accurate focusing of the target 7.
A lamp bead array is arranged in the annular part of the annular light source 26 and used for uniformly illuminating a target from the periphery so as to facilitate imaging of a camera, and in addition, the annular light source 26 plays a role of a light emitting light source when the parallelism of a beacon light receiving optical axis of a calibrated prototype is calibrated; the annular light source 26 has an inner diameter of 16mm, an outer diameter of 22mm and a central transverse thickness of 1 mm.
The dichroic spectroscope 8 comprises a first surface and a second surface which are opposite, wherein the surface on which light is incident is used as the first surface, the first surface is plated with a spectrum light splitting film, and the second surface is plated with an antireflection film and is used for separating light rays with different spectrum wave bands and respectively entering respective imaging systems; the dichroic beamsplitter 8 has an outer diameter of 26mm and a central transverse thickness of 1 mm.
The beacon light imaging group comprises a first beacon light focusing lens 9, a second beacon light focusing lens 10, a third beacon light focusing lens 11, a fourth beacon light focusing lens 12, a first folding reflector 13, a first beacon light imaging lens 14, a second beacon light imaging lens 15, a third beacon light imaging lens 16 and a beacon light imaging focal plane 17; the beacon light imaging group is used for imaging the target 7 under a limited distance and secondarily imaging the beacon light beam of the calibrated prototype. The first beacon light focusing lens 9 is a biconvex lanthanum flint positive lens, the second beacon light focusing lens 10 is a biconvex fluorine crown positive lens, the third beacon light focusing lens 11 is a biconcave heavy flint negative lens, the fourth beacon light focusing lens 12 is a plano-convex barium crown positive lens, the first turning reflector 13 is made of a high-precision surface type optical material, the first beacon light imaging lens 14 is a biconvex lanthanum crown positive lens, the second beacon light imaging lens 15 is a positive meniscus lanthanum flint negative lens, and the third beacon light imaging lens 16 is a negative meniscus heavy flint negative lens. The outer diameter of the first beacon light focusing lens 9 is 21mm, the first convex curvature radius is 48.31mm, the second convex curvature radius is-37.33 mm, the center transverse thickness is 4.4mm in the optical path direction in this order, the outer diameter of the second beacon light focusing lens 10 is 19mm, the first convex curvature radius is 16.67mm, the second convex curvature radius is-32.28 mm, the center transverse thickness is 6mm in the optical path direction in this order, the outer diameter of the third beacon light focusing lens 11 is 19mm, the first concave curvature radius is-32.28 mm, the second concave curvature radius is 11.52mm, the center transverse thickness is 2.6mm in this order, the outer diameter of the fourth beacon light focusing lens 12 is 19mm, the convex curvature radius is 16.44mm in the optical path direction in this order, the center transverse thickness is 5mm, the outer diameter of the first turning mirror 13 is 15mm, the center transverse thickness is 2mm, the outer diameter of the first beacon light imaging lens 14 is 13mm, The first convex curvature radius is 19.06mm, the second convex curvature radius is-74.64 mm, the center transverse thickness is 3.2mm along the optical path direction in sequence, the outer diameter of the second beacon light imaging lens 15 is 13mm, the convex curvature radius is 11.46mm, the concave curvature radius is 8.13mm, the center transverse thickness is 6mm along the optical path direction in sequence, the outer diameter of the third beacon light imaging lens 16 is 13mm, the concave curvature radius is-9.12 mm, the convex curvature radius is-30.2 mm, and the center transverse thickness is 6mm along the optical path direction in sequence; the center distance between the first beacon light focusing lens 9 and the second beacon light focusing lens 10 is 3.6mm, the second beacon light focusing lens 10 and the third beacon light focusing lens 11 are cemented with each other, the center distance between the third beacon light focusing lens 11 and the fourth beacon light focusing lens 12 is 1.5mm, the center distance between the fourth beacon light focusing lens 12 and the first folding mirror 13 is 10.6mm, the center distance between the first folding mirror 13 and the first beacon light imaging lens 14 is 22mm, the center distance between the first beacon light imaging lens 14 and the second beacon light imaging lens 15 is 0.5mm, the center distance between the second beacon light imaging lens 15 and the third beacon light imaging lens 16 is 2.5mm, and the center distance between the third beacon light imaging lens 16 and the beacon light imaging focal plane 17 is 14 mm. The first beacon light focusing lens 9, the second beacon light focusing lens 10, the third beacon light focusing lens 11 and the fourth beacon light focusing lens 12 form a focusing group in a beacon light imaging group, and a single-lens or double-lens form is adopted to compress a divergent beacon light beam at a large angle, so that the beacon light imaging group can be focused clearly when system states such as environmental changes change and the like are changed, and the precision of optical axis calibration is improved; the first folding reflector 13 is used for folding the light path of the beacon light imaging group, so as to reduce the volume of the calibration system; the first beacon light imaging lens 14, the second beacon light imaging lens 15 and the third beacon light imaging lens 16 form an imaging rear group in the beacon light imaging group, and a three-separation single lens forming mode is adopted for correcting residual aberration of beacon light imaging and improving calibration accuracy; the beacon light imaging focal plane 17 is used to take up a sharp image of the target 7 and the beacon light.
The communication light imaging group comprises a first communication light focusing lens 18, a second communication light focusing lens 19, a third communication light focusing lens 20, a first communication light imaging lens 21, a second turning reflector 22, a second communication light imaging lens 23, a third turning reflector 24 and a communication light imaging focal plane 25; the communication light imaging group is used for imaging the target 7 under a limited distance and secondarily imaging the communication light beam of the calibrated prototype. The first communication light focusing lens 18 is a negative meniscus low-hardness deformation aspheric positive lens, the second communication light focusing lens 19 is a biconvex heavy flint positive lens, the third communication light focusing lens 20 is a positive meniscus crown positive lens, the first communication light imaging lens 21 is a positive meniscus lanthanum flint positive lens, the second turning reflector 22 is a high-precision surface type optical material, the second communication light imaging lens 23 is a negative meniscus lanthanum flint positive lens, and the third turning reflector 24 is a high-precision surface type optical material; the first communication light focusing lens 18 has an outer diameter of 20mm, a radius of curvature in the X-axis direction of the anamorphic aspheric surface in the optical path direction of-207.65 mm, a radius of curvature in the Y-axis direction of the anamorphic aspheric surface of-205.17 mm, a radius of curvature of the convex surface of-61.99 mm, and a center lateral thickness of 3mm, the second communication light focusing lens 19 has an outer diameter of 20mm, a radius of curvature of the first convex surface in the optical path direction of 66.85mm, a radius of curvature of the second convex surface of-424.76 mm, and a center lateral thickness of 3.26mm, the third communication light focusing lens 20 has an outer diameter of 20mm, a radius of curvature of the convex surface in the optical path direction of 37.48mm, a radius of curvature of the concave surface of 105.28mm, and a center lateral thickness of 3.25mm, the first communication light imaging lens 21 has an outer diameter of 16mm, a radius of curvature of the convex surface in the optical path direction of 19.98mm, a radius of curvature, the outer diameter of the second turning reflector 22 is 16mm, the central transverse thickness is 2mm, the outer diameter of the second communication light imaging lens 23 is 9mm, the concave curvature radius is-11.12 mm, the convex curvature radius is-10.92 mm, and the central transverse thickness is 5mm in sequence along the light path direction, the outer diameter of the third turning reflector 24 is 21mm, and the central transverse thickness is 3 mm; the center distance between the first communication light focusing lens 18 and the second communication light focusing lens 19 is 0.6mm, the center distance between the second communication light focusing lens 19 and the third communication light focusing lens 20 is 0.5mm, the center distance between the third communication light focusing lens 20 and the first communication light imaging lens 21 is 9.6mm, the center distance between the first communication light imaging lens 21 and the second turning mirror 22 is 10.43mm, the center distance between the second turning mirror 22 and the second communication light imaging lens 23 is 12mm, the center distance between the second communication light imaging lens 23 and the third turning mirror 24 is 12.24mm, and the center distance between the third turning mirror 24 and the communication light imaging focal plane 25 is 15 mm. The first communication light focusing lens 18, the second communication light focusing lens 19 and the third communication light focusing lens 20 form a focusing group in a communication light imaging group, a three-separation single lens form mode is adopted, divergent communication light beams are compressed at a large angle, the communication light imaging group can be guaranteed to be focused clearly when system states such as environmental changes and the like change, the precision of optical axis calibration is improved, and in addition, the first surface of the first communication light focusing lens 18 in the light path direction sequentially adopts a deformed aspheric surface type for correcting astigmatic aberration introduced by the dichroic beam splitter 8; the second turning reflector 22 and the third turning reflector 24 are used for folding the optical path of the communication optical imaging group, so that the volume of the calibration system is reduced; the first communication light imaging lens 21 and the second communication light imaging lens 23 form an imaging rear group in the communication light imaging group, and the two high-refractive-index single lenses are used for correcting residual aberration of communication light imaging and improving calibration precision; the communication light imaging focal plane 25 is used for receiving the target 7 and the clear image of the communication light.
In the above embodiments, the center distance between the protection window 1 and the pre-calibration group, that is, the center distance between the protection window 1 and the hyperboloid secondary mirror 3 in the pre-calibration group is 10mm, the center distance between the pre-calibration group and the target 7, that is, the center distance between the third broad-spectrum imaging lens 6 and the target 7 in the pre-calibration group is 5.92mm, the center distance between the target 7 and the ring-shaped light source 26 is 2.32mm, the center distance between the ring-shaped light source 26 and the dichroic beam splitter 8 is 9.68mm, the center distance between the dichroic beam splitter 8 and the beacon light imaging group, that is, the center distance between the dichroic beam splitter 8 and the first beacon light focusing lens 18 in the beacon light imaging group, is 15 mm.
Through the mode, the calibration of the optical axis of the portable free space quantum communication with high precision can be realized, the size is small, the functions are comprehensive, the anti-interference capability is high, and the method is suitable for various field working environments.
It should be noted that, in the description of the present application, the terms "first", "second", and the like are used for descriptive purposes only and for distinguishing similar objects, and no precedence between the two is intended or should be construed to indicate or imply relative importance. In addition, in the description of the present application, "a plurality" means two or more unless otherwise specified.
The present application has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to limit the application. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the presently disclosed embodiments and implementations thereof without departing from the spirit and scope of the present disclosure, and these fall within the scope of the present disclosure. The protection scope of this application is subject to the appended claims.
Claims (7)
1. A portable free space quantum communication optical axis calibration optical system is characterized by comprising a protection window, a pre-calibration group, a target, an annular light source, a dichroic spectroscope, a beacon light imaging group and a communication light imaging group;
the protection window, the pre-calibration group, the target, the annular light source and the dichroic spectroscope are sequentially arranged; the communication light entering through the protection window sequentially passes through the pre-calibration group, the target, the annular light source, the dichroic beam splitter and the communication light imaging group and is imaged in the communication light imaging group; the beacon light entering through the protection window sequentially passes through the pre-calibration group, the target, the annular light source, the dichroic beam splitter and the beacon light imaging group and is imaged in the beacon light imaging group; the broad spectrum light emitted by the annular light source sequentially passes through the target, the calibration front group and the protection window;
the pre-calibration group comprises a Cassegrain reflective objective lens group and a wide-spectrum imaging group, the Cassegrain reflective objective lens group comprises a paraboloid main reflector and a hyperboloid secondary reflector, the paraboloid main reflector comprises a first quadric surface, the hyperboloid secondary reflector comprises a second quadric surface, the wide-spectrum imaging group comprises a first wide-spectrum imaging lens, a second wide-spectrum imaging lens and a third wide-spectrum imaging lens, the first wide-spectrum imaging lens is a negative meniscus positive lens, the second wide-spectrum imaging lens is a negative meniscus negative lens, the third wide-spectrum imaging lens is a negative meniscus negative lens, and the hyperboloid secondary reflector, the first wide-spectrum imaging lens, the paraboloid main reflector, the second wide-spectrum imaging lens and the third wide-spectrum imaging lens are sequentially arranged and have coaxial centers;
the beacon light imaging group comprises a first beacon light focusing lens, a second beacon light focusing lens, a third beacon light focusing lens, a fourth beacon light focusing lens, a first turning reflector, a first beacon light imaging lens, a second beacon light imaging lens, a third beacon light imaging lens and a beacon light imaging focal plane; the first beacon light focusing lens is a biconvex lanthanum flint positive lens, the second beacon light focusing lens is a biconvex fluorine crown positive lens, the third beacon light focusing lens is a biconcave heavy flint negative lens, the fourth beacon light focusing lens is a plano-convex barium crown positive lens, the first beacon light imaging lens is a biconvex lanthanum crown positive lens, the second beacon light imaging lens is a positive meniscus lanthanum flint negative lens, and the third beacon light imaging lens is a negative meniscus heavy flint negative lens;
the communication light imaging group comprises a first communication light focusing lens, a second communication light focusing lens, a third communication light focusing lens, a first communication light imaging lens, a second turning reflector, a second communication light imaging lens, a third turning reflector and a communication light imaging focal plane; first communication light focusing lens is the positive lens of negative meniscus aspheric surface, second communication light focusing lens is the positive lens of biconvex heavy flint, third communication light focusing lens is the positive lens of positive meniscus crown, first communication light imaging lens is the positive lens of positive meniscus lanthanum flint, second communication light imaging lens is the positive lens of negative meniscus lanthanum flint.
2. The optical system for calibrating the optical axis of portable free-space quantum communication according to claim 1, wherein the protection window is a flat glass, the angle of inclination of the protection window with respect to the vertical direction is in the range of 3-10 degrees, the outer diameter of the protection window is 65mm, and the central transverse thickness of the protection window is 6 mm.
3. The portable free-space quantum communication optical axis calibration optical system of claim 1, wherein a center-to-center distance between the protection window and the pre-calibration set is 10mm, a center-to-center distance between the pre-calibration set and the target is 5.92mm, a center-to-center distance between the target and the ring light source is 2.32mm, a center-to-center distance between the ring light source and the dichroic beamsplitter is 9.68mm, a center-to-center distance between the dichroic beamsplitter and the beacon light imaging set is 14mm, and a center-to-center distance between the dichroic beamsplitter and the communication light imaging set is 15 mm.
4. The portable free-space quantum communication optical axis calibration optical system of claim 1, wherein the dichroic beam splitter comprises a first side and a second side opposite, the first side coated with a spectrum splitting film, the second side coated with an anti-reflection film; the dichroic beam splitter has an outer diameter of 26mm and a central transverse thickness of 1 mm.
5. The portable free-space quantum communication optical axis calibration optical system of claim 1, wherein the target is an annular target with an inner diameter of 0.8mm and an outer diameter of 16 mm.
6. The portable free-space quantum communication optical axis calibration optical system of claim 1, wherein the ring light source has an inner diameter of 16mm, an outer diameter of 22mm, and a central transverse thickness of 1 mm.
7. The portable free-space quantum communication optical axis calibration optical system of claim 1, wherein the parabolic primary mirror is provided with a primary mirror light shield, the hyperbolic secondary mirror is provided with a secondary mirror light shield, and the first wide-spectrum imaging lens is disposed within the primary mirror light shield.
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| DE59700214D1 (en) * | 1996-11-25 | 1999-07-22 | Contraves Ag | Method and device for the optical transmission of data over free spaces |
| US20040179848A1 (en) * | 2003-03-11 | 2004-09-16 | Mikhail Belenkii | Scintillation free laser communication system |
| CN102207614A (en) * | 2011-03-16 | 2011-10-05 | 中国科学院上海技术物理研究所 | Deep space optical communication tracking and aiming system and method |
| CN104765128B (en) * | 2015-04-21 | 2017-01-11 | 长春理工大学 | Environment defocusing self-adaptation compensation method for airborne laser communication system |
| CN109889277B (en) * | 2019-01-25 | 2021-09-21 | 中国科学院光电技术研究所 | Light and small athermalized optical system of quantum communication ground station telescope |
| CN211406034U (en) * | 2020-01-22 | 2020-09-01 | 华南师范大学 | Free space quantum key distribution system for aircraft |
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