Wide spectral range long-eyepoint optical system for multi-source optical signal simulation

Abstract

The application provides a wide-spectrum long-ocular-distance optical system for multi-source optical signal simulation, and belongs to the technical field of optical equipment. The application provides a wide-spectrum long-ocular-distance optical system for multi-source optical signal simulation, and belongs to the technical field of optical equipment. The application provides a wide-spectrum long-ocular-distance optical system for multi-source optical signal simulation, and belongs to the technical field of optical equipment. The application provides a wide-spectrum long-ocular-distance optical system for multi-source optical signal simulation, and belongs to the technical field of optical equipment. The application provides a wide-spectrum long-ocular-distance optical system for multi-source optical signal simulation, and belongs to the technical field of optical equipment. The application provides a wide-spectrum long-ocular-distance optical system for multi-source optical signal simulation, and belongs to the technical field of optical equipment. The application provides a wide-spectrum long-ocular-distance optical system for multi-source optical signal simulation, and belongs to the technical field of optical equipment. The application provides a wide-spectrum long-ocular-distance optical system for multi-source optical signal simulation, and belongs to the technical field of optical equipment. The application provides a wide-spectrum long-ocular-distance optical system for multi-source optical signal simulation, and belongs to the technical field of optical equipment. The application provides a wide-spectrum long-ocular-distance optical system for multi-source optical signal simulation, and belongs to the technical field of optical equipment. The application provides a wide-spectrum long-ocular-distance optical system for multi-source optical signal simulation, and belongs to the technical field of optical equipment. The application provides a wide-spectrum long-ocular-distance optical system for multi-source optical signal simulation, and belongs to the technical field of optical equipment. The application provides a wide-spectrum long-ocular-distance optical system for multi-source optical signal simulation, and belongs to the technical field of optical equipment. The application provides a wide-spectrum long-ocular-distance optical system for multi-source optical signal simulation, and belongs to the technical field of optical equipment. The application provides a wide-spectrum long-ocular-distance optical system for multi-source optical signal simulation, and belongs to the technical field of optical equipment. The application provides a wide-spectrum long-ocular-distance optical system for multi-source optical signal simulation, and belongs to the technical field of optical equipment. The application provides a wide-spectrum long-ocular-distance optical system for multi-source optical signal simulation, and belongs to the technical field of optical equipment. The application provides a wide-spectrum long-ocular-distance optical system for multi-source optical signal simulation, and belongs to the technical field of optical equipment. The application provides a wide-spectrum long-ocular-distance optical system for multi-source optical signal simulation, and belongs to the technical field of optical equipment. The application

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of optical equipment, and specifically relates to a wide-spectrum long-ocular-distance optical system for multi-source optical signal simulation. BACKGROUND

[0002] Ground detection is one of important means for function detection and performance verification of space equipment, can ensure the efficient operation of the equipment after entering the orbit, and can promote the continuous iteration of the performance of the equipment, and effectively overcomes the disadvantages of high experimental cost, long cycle and poor repeatability in real space environment. The space target simulation equipment is a ground detection equipment developed for space optical detection, which can simulate infinite or quasi-infinite target, and the optical system is the main medium for converting electrical signal into optical signal, so the structure form will directly affect the performance of the equipment. The structure form of the optical system of the multi-source information simulator of the target commonly used in the prior art mainly includes a split spectrum single space target simulator optical system and a composite spectrum integrated space target simulator optical system.

[0003] The split spectrum single space target simulator generally refers to a split type simulator independent of different spectral bands, and the working spectral band of each simulator optical system generally includes ultraviolet, visible, medium wave infrared and long wave infrared independent working spectral bands.

[0004] The ultraviolet simulator commonly adopts an ultraviolet material to make a transmission type optical system, and each system can generally cover a width of about 100 nm in a spectral band range of 240-450 nm. The development of the optical system of the visible light simulator is relatively comprehensive, and the working spectral band can cover the visible light range (400-800 nm). The infrared simulator selects a black body radiation source, and according to the temperature difference, the signal of 2-12 mu m can be provided, and the optical system commonly adopts an infrared material transmission system or a reflection system, and generally can cover a spectral band width of 1-5 mu m.

[0005] The performance index of the traditional split spectrum optical system can reach the ground detection experiment standard, but the spectral band coverage is narrow due to the material limitation, and the continuous spectral band space target display cannot be realized. If the light signal of the continuous spectral band is desired to be output, a plurality of independent light paths with different optical apertures are required, which is high in cost, low in integration, and poor in matching with the detector, and the continuous display of the multi-spectral band space target cannot be realized.

[0006] The composite spectrum integrated space target simulator is generally applied to the scene of simultaneous work of multiple spectral bands, and therefore the optical system thereof needs to adopt a reflection type optical structure to enhance the adaptability of the working spectral band.

[0007] The light path control of the composite spectrum integrated optical system is difficult, the exit pupil distance and the optical performance are difficult to balance, the exit pupil position is not easy to control, the short exit pupil distance is difficult to apply to the detection system with the entrance pupil built-in, the energy receiving of the detector and the system aperture are required to be high, and the applicability of the whole system is sacrificed. SUMMARY

[0008] In view of the above problems of the prior art, the technical problem to be solved by the embodiments of the present application is to provide a wide-spectrum long-exit-pupil-distance optical system for multi-source optical signal simulation.

[0009] To solve the above technical problem, the present application provides the following technical scheme:

[0010] A wide-spectrum long-exit-pupil-distance optical system for multi-source optical signal simulation, comprising a visible light engine, an aberration correction lens group, a dichroic beam splitter, an infrared beam combining module, a common-path collimating lens group and a diaphragm arranged along the light path.

[0011] The infrared beam combining module comprises a middle-wave infrared optical engine, a long-wave infrared optical engine and an infrared beam splitter prism for combining the middle-wave infrared and long-wave infrared beams.

[0012] The light beam emitted by the visible light engine passes through the aberration correction lens group and the dichroic beam splitter in sequence.

[0013] The light beams emitted by the middle-wave infrared optical engine and the long-wave infrared optical engine are combined by the infrared beam splitter prism, then combined with the visible light beam by the dichroic beam splitter to form a multi-spectrum composite light beam, and emitted by the diaphragm through the common-path collimating lens group.

[0014] The common-path collimating lens group is an off-axis three-mirror structure.

[0015] As a further improved scheme, the common-path collimating lens group comprises a concave spherical mirror, a convex flat spherical mirror and a concave ellipsoidal mirror arranged in sequence along the propagation direction of the multi-spectrum composite light beam.

[0016] The multi-spectrum composite light beam is collimated by the concave spherical mirror, the convex flat spherical mirror and the concave ellipsoidal mirror in sequence and then emitted by the diaphragm.

[0017] As a further improved scheme, the aberration correction lens group is composed of five lenses arranged in sequence along the light path direction, i.e., a first biconvex lens, a first biconcave lens, a positive crescent lens, a second biconcave lens and a second biconvex lens.

[0018] As a further improved scheme, the concave spherical mirror is off-axis along the negative direction of the y-axis, and the off-axis amount ΔY1 satisfies: -170mm < ΔY1 < -160mm.

[0019] The concave ellipsoidal mirror is off-axis along the positive direction of the y-axis, and the off-axis amount ΔY2 satisfies: 170mm < ΔY2 < 180mm.

[0020] As a further improvement scheme: the convex oblate spherical mirror and the concave ellipsoidal mirror are aspherical mirrors, and aspherical conic coefficients κ1 and κ2 of the aspherical mirrors satisfy: 0 < κ1 < 10 and -1 < κ2 < 0.

[0021] As a further improvement scheme: the following relationship is satisfied:

[0022] -0.794 < f / f6 < -0.791;

[0023] 1.483 < f / f7 < 1.486;

[0024] -1.382 < f / f8 < -1.378;

[0025] Wherein, f is the focal length of the optical system, and f6, f7 and f8 are the focal lengths of the concave spherical mirror, the convex oblate spherical mirror and the concave ellipsoidal mirror respectively.

[0026] As a further improvement scheme: the focal lengths f1 to f5 of the five lenses in the aberration correction lens group and the system focal length f satisfy the following relationship:

[0027] -2.37 < f / f1 < -2.32;

[0028] 0.303 < f / f2 < 0.306;

[0029] -2.401 < f / f3 < -2.398;

[0030] 3.214 < f / f4 < 3.218;

[0031] -0.73 < f / f5 < -0.727;

[0032] Wherein, f is the focal length of the optical system, and f1, f2, f3, f4 and f5 are the focal lengths of the first biconvex lens, the first biconcave lens, the positive meniscus lens, the second biconcave lens and the second biconvex lens respectively.

[0033] Compared with the prior art, the beneficial effects of the present application are: through the co-caliber design, the complex structure of the four independent systems originally required is integrated into a relatively compact frame, the overall volume and complexity of the system are reduced, and the wide-spectrum integration design of the visible spectrum, the medium-wave infrared spectrum and the long-wave infrared spectrum is realized.

[0034] Two pieces of spectroscope and a piece of off-axis three-mirror collimator are used to form a multi-source integrated collimator, without sacrificing the image quality, the off-axis design has great freedom, so that the system also completes the design of the exit pupil, the exit pupil is guided to a reasonable position on the structure, which leaves sufficient docking space for the measured device, and has excellent usability. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is a working principle diagram of a wide-spectrum long-exit-pupil optical system for multi-source optical signal simulation;

[0036] Figure 2 It is a schematic diagram of the overall structure of a wide-spectrum long-exit-pupil optical system for multi-source optical signal simulation;

[0037] Figure 3 It is a full-spectrum long-exit-pupil optical system design diagram of a wide-spectrum long-exit-pupil optical system for multi-source optical signal simulation;

[0038] Figure 4 It is a visible light system MTF curve diagram of a wide-spectrum long-exit-pupil optical system for multi-source optical signal simulation;

[0039] Figure 5 It is a visible light system point array diagram of a wide-spectrum long-exit-pupil optical system for multi-source optical signal simulation;

[0040] Figure 6 It is a visible light system grid distortion diagram of a wide-spectrum long-exit-pupil optical system for multi-source optical signal simulation;

[0041] Figure 7 It is a mid-wave infrared system MTF curve diagram of a wide-spectrum long-exit-pupil optical system for multi-source optical signal simulation;

[0042] Figure 8 It is a mid-wave infrared system point array diagram of a wide-spectrum long-exit-pupil optical system for multi-source optical signal simulation;

[0043] Figure 9 It is a mid-wave infrared system grid distortion diagram of a wide-spectrum long-exit-pupil optical system for multi-source optical signal simulation;

[0044] Figure 10 It is a long-wave infrared system MTF curve diagram of a wide-spectrum long-exit-pupil optical system for multi-source optical signal simulation;

[0045] Figure 11 It is a long-wave infrared system point array diagram of a wide-spectrum long-exit-pupil optical system for multi-source optical signal simulation;

[0046] Figure 12 A long-wave infrared system grid distortion chart of a wide-spectrum long-eyrelength optical system for multi-source optical signal simulation;

[0047] In the figure: 1, light source; 2, long-wave infrared optical engine; 3, medium-wave infrared optical engine; 4, infrared light-splitting prism; 5, dichroic beam splitter; 6, concave spherical mirror; 7, convex flat spherical mirror; 8, concave ellipsoidal mirror; 9, diaphragm. DETAILED DESCRIPTION

[0048] The technical solutions of the present application will be further described in detail below in combination with specific embodiments.

[0049] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0050] Please refer to Figures 1 to 3 In one embodiment, a wide-spectrum long-eyrelength optical system for multi-source optical signal simulation includes a visible light engine, an aberration correction lens group A, a dichroic beam splitter 5, an infrared beam combining module, a common-path collimating lens group, and a diaphragm 9 arranged along the optical path;

[0051] The infrared beam combining module includes a medium-wave infrared optical engine 3, a long-wave infrared optical engine 2, and an infrared light-splitting prism 4 for combining the medium-wave infrared and long-wave infrared beams;

[0052] The light beam emitted by the visible light engine passes through the aberration correction lens group A and the dichroic beam splitter 5 in turn;

[0053] The light beams emitted by the medium-wave infrared optical engine 3 and the long-wave infrared optical engine 2 are combined by the infrared light-splitting prism 4, then combined with the visible light beam by the dichroic beam splitter 5 to form a multi-spectrum composite light beam, which is emitted by the diaphragm 9 through the common-path collimating lens group;

[0054] The common-path collimating lens group is an off-axis three-mirror structure.

[0055] In the embodiment, a wide-spectrum integrated space target simulator optical system covering visible light (380-780 nm), medium-wave infrared (3-5 μm) and long-wave infrared (6-12 μm) is designed and implemented by adopting three wavelength configuration optimizations. A common-path collimating mirror group is used to constrain the composite light path, and the central obstruction is fundamentally eliminated. The near-symmetrical off-axis structure ensures high MTF and superior image quality while realizing the out-of-pupil placement. The out-of-pupil distance is greater than 1000 mm, which is convenient for matching with the measured device pupil and improves the versatility of the system.

[0056] The three configurations of the system are suitable for visible systems, medium-wave infrared systems and long-wave infrared systems respectively. The visible system is equipped with an aberration correction mirror group A to compensate for aberration. The visible light signal passes through the aberration correction mirror group A and the light signal of the medium-wave / long-wave infrared system passes through a dichroic beam splitter 5 to mix. The signals of the medium-wave and long-wave infrared pass through an infrared beam splitter prism 4 to mix. The light beams of the three configurations are mixed and then pass through the common-path collimating mirror group.

[0057] Referring to Figures 1 to 3 , as another embodiment of the present application: the common-path collimating mirror group comprises a concave spherical mirror 6, a convex flat spherical mirror 7 and a concave ellipsoidal mirror 8 arranged in sequence along the propagation direction of the multi-spectrum composite light beam.

[0058] The multi-spectrum composite light beam is collimated by the concave spherical mirror 6, the convex flat spherical mirror 7 and the concave ellipsoidal mirror 8 in sequence and then exits from the diaphragm 9.

[0059] In the embodiment, the off-axis three-mirror part of the common-path collimating mirror group is composed of two off-axis ellipsoidal mirrors and one spherical mirror, and the first and third pieces are the concave spherical mirror 6 and the concave ellipsoidal mirror 8 respectively, and the second piece is the convex flat spherical mirror 7. The light beam is adjusted to be parallel light by the common-path collimating mirror group and then exits from the diaphragm 9.

[0060] The light signals emitted by the long-wave infrared optical engine 2 and the medium-wave infrared optical engine 3 of the system pass through the infrared beam splitter prism 4 to combine, and the light signal emitted by the visible optical engine passes through the aberration correction mirror group A and the dichroic beam splitter 5 to combine with the infrared signal. The fused multi-spectrum composite light beam passes through the concave spherical mirror 6, the convex flat spherical mirror 7 and the concave ellipsoidal mirror 8 in sequence and finally exits from the diaphragm 9.

[0061] Referring to Figures 1 to 3 , as another embodiment of the present application: the aberration correction mirror group A is composed of five lenses, which are a first double convex lens, a first double concave lens, a positive crescent lens, a second double concave lens and a second double convex lens in sequence along the light path direction.

[0062] In the embodiment, the aberration correction lens group A contains five lenses, and in the direction from the visible light source 1 to the dichroic beam splitter 5, two sets of double separated lens groups and one single lens are designed respectively, wherein the first lens in the first set of double separated lens groups is a first double convex lens, and the second lens is a first double concave lens; the first lens in the second set is a positive crescent lens, and the second lens is a second double concave lens; the last single lens is a second double convex lens, and the materials are QF1, D-ZLAF61, H-QF14, H-ZBAF5, and H-K3 respectively.

[0063] As another embodiment of the application: the concave spherical mirror 6 is decentered along the negative direction of the y axis, and the decentering amount ΔY1 satisfies: -170mm<ΔY1<-160mm.

[0064] The concave ellipsoidal mirror 8 is decentered along the positive direction of the y axis, and the decentering amount ΔY2 satisfies: 170mm<ΔY2<180mm.

[0065] The convex oblate spherical mirror 7 and the concave ellipsoidal mirror 8 are aspherical mirrors, and the aspherical conic coefficients κ1 and κ2 satisfy: 0<κ1<10 and -1<κ2<0 respectively.

[0066] The following relationship is satisfied:

[0067] -0.794<f / f6<-0.791;

[0068] 1.483<f / f7<1.486;

[0069] -1.382<f / f8<-1.378;

[0070] Wherein, f is the focal length of the optical system, f6, f7, and f8 are the focal lengths of the concave spherical mirror 6, the convex oblate spherical mirror 7, and the concave ellipsoidal mirror 8 respectively.

[0071] In the embodiment, the collimating mirror group of the system contains three mirrors: the air gap between the dichroic beam splitter 5 and the concave spherical mirror 6 is 518.139mm, the concave spherical mirror 6 is decentered by about 170mm along the negative direction of the y axis, the air gap between the convex oblate spherical mirror 7 and the concave ellipsoidal mirror 8 is 508.139mm, the air gap between the convex oblate spherical mirror 7 and the concave ellipsoidal mirror 8 is 448.138mm, the concave ellipsoidal mirror 8 is decentered by about 170mm along the positive direction of the y axis, and the air gap between the concave ellipsoidal mirror 8 and the diaphragm 9 is 1044.241mm.

[0072] As another embodiment of the application: the focal lengths f1 to f5 of the five lenses in the aberration correction lens group A and the system focal length f satisfy the following relationship:

[0073] -2.37<f / f1<-2.32, 0.5<R1 / f1<1, -2.5<R2 / f1<-2;

[0074] 0.303<f / f2<0.306, 2<R3 / f2<2.5, -1.5<R4 / f2<-1;

[0075] -2.401<f / f3<-2.398, -21<R5 / f3<-20, -1<R6 / f3<-0.5;

[0076] 3.214<f / f4<3.218, 0.5<R7 / f4<1, -6<R8 / f4<-5.5;

[0077] -0.73<f / f5<-0.727, 1.5<R9 / f5<2, -1<R 10 / f5<-0.5;

[0078] Wherein, f is the focal length of the optical system, f1, f2, f3, f4, f5 are the focal lengths of the first double convex lens, the first double concave lens, the positive crescent lens, the second double concave lens and the second double convex lens respectively, R1~R 10 are the curvature radii of the ten surfaces of the five lenses of the system in turn.

[0079] In the embodiment, the air gap between the visible light engine and the aberration correction lens group A is 50mm, the air gap between the two double separation groups of the aberration correction lens group A is 37.46mm, the air gap between the first double separation group is 0.683mm, the air gap between the second double separation group is 1.19mm, the air gap between the second double separation group and the second double convex lens is 12.312mm, and the air gap between the second double convex lens and the dichroic mirror 5 is 75mm.

[0080] The following table is the parameter table of the wide spectrum integrated optical system provided by the application.

[0081]

[0082] The MTF of the visible light system is as shown in Figure 4 The MTF curves of each field of view and wavelength have approached the diffraction limit, indicating that the imaging quality is good.

[0083] The optical design point list of the visible light system is as shown in Figure 5 The RMS radius values of the full field of view spot are all within the range of 7μm, and the imaging quality is good.

[0084] Unlike the on-axis system, the off-axis optical system uses grid distortion to evaluate the system distortion. Since the off-axis optical system uses off-axis imaging, the off-axis aberration is large, as Figure 6As shown, the maximum distortion of the visible light system does not exceed 0.3%.

[0085] The air gap between the mid-wave infrared optical engine 3 and the infrared beam splitter 4 is 90 mm, and the air gap between the infrared beam splitter 4 and the dichroic beam splitter 5 is 111.458 mm.

[0086] The mid-wave infrared optical system configuration has a focal length of -229mm and an operating wavelength range of 3~5μm.

[0087] MTF of mid-wave infrared systems, such as Figure 7 As shown, the MTF curves for each field of view and wavelength are close to the diffraction limit, indicating good imaging quality.

[0088] Optical design point array diagram of mid-wave infrared system as follows Figure 8 As shown, the RMS radius values ​​of the full field-of-view light spot are all within the range of 7μm, indicating good imaging quality.

[0089] like Figure 9 As shown, the maximum distortion of the mid-wave infrared system does not exceed 0.8%.

[0090] The air gap between the long-wave infrared optical engine 2 and the infrared beam splitter 4 in the system is 90 mm.

[0091] The long-wave infrared optical system is configured with a focal length of -229mm and an operating wavelength range of 6~12μm.

[0092] MTF of long-wave infrared systems, such as Figure 10 As shown, the MTF curves for each field of view and wavelength are close to the diffraction limit, indicating good imaging quality.

[0093] Optical design point array diagram of long-wave infrared system as follows Figure 11 As shown, the RMS radius values ​​of the full field-of-view light spot are all within the range of 10μm, indicating good imaging quality.

[0094] like Figure 12 As shown, the maximum distortion of the long-wave infrared system does not exceed 0.8%.

[0095] Traditional transmission materials struggle to maintain good transmittance and consistent refractive properties across the visible light (400 nm) to long-wave infrared (12 μm) range, and exhibit chromatic dispersion, leading to significant chromatic aberration due to the broad spectral requirements. Therefore, traditional solutions typically require separate optical systems for different spectral bands, which are bulky and difficult to align. Reflective optical systems, on the other hand, offer wavelength-independent imaging performance, allowing imaging across all bands from the visible to the mid-to-long-wave infrared on a single optical system. This fundamentally solves the problem of excessive chromatic aberration, making full-spectrum coverage possible.

[0096] The traditional space target simulator optical system is difficult to integrate multiple different spectral band light signal outputs, and is slightly insufficient for detection experiments of various detectors. The present application integrates the complex structure of four independent systems into a relatively compact framework (total system length 1100mm) through common aperture design, reduces the overall volume and complexity of the system. Wide spectral band integration design of visible spectral band (0.4~0.8um), medium wave infrared spectral band (3~5um) and long wave infrared spectral band (6~12um) is realized, which can meet the detection experiment requirements of most current detectors in one-to-many.

[0097] The present application adopts two pieces of beam splitter and a piece of off-axis three-mirror type multi-source integrated collimating mirror group, on the basis of not sacrificing image quality, the great freedom of off-axis design makes the system also complete the out-pupil design (out-pupil distance is about 1000mm), the out-pupil of the system is guided to a structure convenient, reasonable in optical position, leaves enough docking space for the measured equipment, has excellent usability.

[0098] For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application, any reference signs in the claims should not be regarded as limiting the claims involved.

[0099] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments that those skilled in the art can understand.

Claims

1. A broadband long exit pupil optical system for multi-source optical signal simulation, characterized in that, It includes a visible light engine, an aberration correction mirror group, a dichroic beam splitter, an infrared beam combiner module, a common-path collimating mirror group, and an aperture arranged along the optical path; The infrared beam combining module includes a mid-wave infrared optical engine, a long-wave infrared optical engine, and an infrared beam splitter prism for combining mid-wave infrared and long-wave infrared beams. The light beam emitted by the visible light engine passes sequentially through the aberration correction mirror group and the dichroic beam splitter. The beams emitted by the mid-wave infrared optical engine and the long-wave infrared optical engine are combined by the infrared beam splitter, and then combined with the visible beam by the dichroic beam splitter to form a multi-spectral composite beam, which is then emitted from the aperture through the common-path collimating lens group. The common-path collimating lens group is an off-axis three-mirror structure; The common-path collimating mirror group includes a concave spherical mirror, a convex oblate spherical mirror, and a concave ellipsoidal mirror arranged sequentially along the propagation direction of the multi-spectral composite beam. The multi-band composite beam is collimated sequentially by the concave spherical mirror, the convex flat spherical mirror and the concave ellipsoidal mirror, and then exits from the aperture. The aberration correction lens group consists of five lenses, which are arranged in the following order along the optical path: a first biconvex lens, a first biconcave lens, a crescent-shaped lens, a second biconcave lens, and a second biconvex lens. The following relationship must be satisfied: -0.794 <f / f6<-0.791; 1.483 <f / f7<1.486; -1.382 <f / f8<-1.378; Where f is the focal length of the optical system, and f6, f7, and f8 are the focal lengths of the concave spherical mirror, the convex oblate spherical mirror, and the concave ellipsoidal mirror, respectively.

2. The broadband long exit pupil optical system for multi-source optical signal simulation according to claim 1, characterized in that, The concave spherical mirror is off-axis along the negative y-axis direction, and the off-axis amount ΔY1 satisfies: -170mm < ΔY1 < -160mm; The concave ellipsoidal reflector is off-axis along the positive y-axis, and the off-axis amount ΔY2 satisfies: 170mm < ΔY2 < 180mm.

3. A broadband long exit pupil optical system for multi-source optical signal simulation according to claim 2, characterized in that, The convex oblate spherical mirror and the concave ellipsoidal mirror are aspherical mirrors, and their aspherical conic coefficients κ1 and κ2 satisfy: 0<κ1<10, -1<κ2<0 respectively.

4. A broadband long exit pupil optical system for multi-source optical signal simulation according to claim 1, characterized in that, The focal lengths f1 to f5 of the five lenses in the aberration correction lens group satisfy the following relationship with the system focal length f: -2.37 <f / f1<-2.32; 0.303 <f / f2<0.306; -2.401 <f / f3<-2.398; 3.214 <f / f4<3.218; -0.73 <f / f5<-0.727; Where f is the focal length of the optical system, and f1, f2, f3, f4, and f5 are the focal lengths of the first biconvex lens, the first biconcave lens, the crescent-shaped lens, the second biconcave lens, and the second biconvex lens, respectively.

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