Design of a high-throughput telescope based on scanning an off-axis three-mirror anastigmat system

Ji, Huiru; Zhu, Zhengbo; Tan, Hao; Shan, Yuefan; Tan, Wei Shen; Ma, Donglin

doi:10.1364/ao.421998

Cited by 14 publications

(4 citation statements)

References 21 publications

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“…During the coaxial design phase, the quaternary mirror (QM) contributes very little to the overall optical power of the system, and can even be a flat mirror without optical power. Therefore, an initial Cassegrain-style three-mirror configuration with a relay image can adequately satisfy the design requirements [33][34][35][36]. Figure 6 shows a ray tracing of an on-axis Cassegrain design for the TianQin mission, including a real relay image.…”

Section: Coaxial System Designmentioning

confidence: 99%

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Pupil aberrations correction of the afocal telescope for the TianQin project

Fan

Zhu

et al. 2023

Class. Quantum Grav.

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TianQin is a planned Chinese space-based gravitational wave (GW) observatory with a frequency band of 10-4 to 1Hz. Optical telescopes are essential for the delivery of the measurement beam to support a precise distance measurement between pairs of proof masses. As the design is driven by the interferometric displacement sensitivity requirements, the stability control of optical path length (OPL) is extremely important beyond the traditional requirement of diffraction-limited imaging quality. In a telescope system, the recurring tilt-to-length (TTL) coupling noise arises from the OPL variation due to the wavefront deformation and angular misalignment. Reducing the residual chief ray aberration in the optical design helps suppress TTL coupling noise. To correct the pupil aberrations, we derive primary pupil aberrations in a series expansion form, and then refine the formulation of merit function by combining the pupil aberration theory and traditional image aberration theory. The automatic correction of pupil aberrations is carried out by using the macro programming in the commercial optical software Zemax, leading to a high performance telescope design. The design results show that on one side the pupil aberrations have been corrected, and on the other side, its optical performance meets the requirements for TianQin project. The RMS wavefront error over the science field of view (FOV) is less than λ/200 and the maximum TTL coupling noise over the entire ±300 μrad FOV is 0.0034nm/µrad. We believe that our design approach can be a good guide for the space telescope design in any other space-based GW detection project, as well as other similar optical systems.

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Section: Coaxial System Designmentioning

confidence: 99%

“…From equations ( 17)-( 21), the primary pupil aberration coefficients can be expressed as the functions of y 1 , y 1 , φ i (i = 1, 2, 3), and t i (i = 1, 2, 3, 4) as equations ( 22)-( 26) [36]…”

Section: Coaxial System Designmentioning

confidence: 99%

Pupil aberrations correction of the afocal telescope for the TianQin project

Fan

Zhu

et al. 2023

Class. Quantum Grav.

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“…An initial configuration with good performance is very important for system design, which can greatly reduce the design difficulty for engineers. For traditional offaxis reflective systems, the optimal initial configuration is retrieved by calculating a spherical coaxial system with no primary aberrations under paraxial conditions [25,26]. However, the AR-HUD optical system consists of a fixed freeform windshield, the design process of paraxial method is rather tedious and is not suitable for HUD.…”

Section: Introductionmentioning

confidence: 99%

Automated design of freeform imaging systems for automotive head-up display applications

Ma¹,

Fan²,

Wei³

et al. 2023

Preprint

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Freeform imaging system is playing a significant role in developing an optical system for the automotive head-up display (HUD), which is a typical application of augmented reality (AR) technology. There exists a strong necessity to develop automated design algorithms for automotive HUDs due to its high complexity of multi-configuration caused by movable eyeballs as well as various drivers’ heights, correcting additional aberrations introduced by the windshield, variable structure constraints originated from automobile types, which, however, is lacking in current research community. In this paper, we propose an automated design method for the automotive AR-HUD optical systems with two freeform surfaces as well as an arbitrary type of windshield. With optical specifications of sagittal and tangential focal lengths, and required structure constraints, our given design method can generate an initial structure with high image quality automatically, and then the final system is realized by our proposed iterative optimization algorithms with superior performances due to the extraordinary starting point. Two examples of AR-HUD systems at different structures are realized automatically by our presented automated design algorithms. Both AR-HUD designs can have superior optical performance for an eye-box of 130mm×50mm and a field of view of 13°×5°, which demonstrates the feasibility and superiority of our proposed design framework.

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“…In the thermal stability design of a coaxial remote camera, only the spacing changes of optical components along the optical axis caused by thermal deformation need to be considered due to the system's symmetry [5,6]. The off-axis reflective optical system is widely used in space remote sensing camera because of its advantages of a larger field of view and the lack of central occlusion [7,8]. However, the off-axis remote sensing camera has an obvious asymmetrical structure, and its reflector exhibits a relative displacement in many directions when it is subjected to a temperature load.…”

Section: Introductionmentioning

confidence: 99%

Thermal Stability Design of Asymmetric Support Structure for an Off-Axis Space Camera

et al. 2021

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With the development of space optical remote sensing technology, especially off-axis space cameras, the thermal dimensional stability of the support structure has become increasingly demanding. However, the asymmetry of the camera structure has not been fully considered in the past design of the thermal stability of off-axis cameras. In order to solve this problem, a support structure with very low thermal deformation in the asymmetric direction is presented in this paper for an off-axis TMA camera. By means of the negative axial thermal expansion coefficient of carbon-fiber-reinforced plastics (CFRP), a composite laminate with near zero-expansion was obtained by adjusting the direction of fiber laying, and the asymmetric feature of the off-axis remote sensing camera structure was fully considered, thus enabling the support structure to have good thermal dimensional stability. We carried out a thermal load analysis and an optical analysis of the whole camera in the case of a temperature rise of 5 °C. The results show that the zero-expansion support structure has good thermal stability, and the thermal deformation in the asymmetric direction of the camera is obviously smaller than that of the isotropic laminate support structure. Compared with the isotropic support structure, the influence of thermal deformation on MTF is reduced from 10.43% to 2.61%. This study innovatively incorporates the asymmetry of the structure into the thermal sta-bility design of an off-axis TMA camera and provides a reference for the thermal stability design of other off-axis space cameras.

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Design of a high-throughput telescope based on scanning an off-axis three-mirror anastigmat system

Cited by 14 publications

References 21 publications

Pupil aberrations correction of the afocal telescope for the TianQin project

Pupil aberrations correction of the afocal telescope for the TianQin project

Automated design of freeform imaging systems for automotive head-up display applications

Thermal Stability Design of Asymmetric Support Structure for an Off-Axis Space Camera

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