Multifield direct design method for ultrashort throw ratio projection optics with two tailored mirrors

Nie, Yunfeng; Mohedano, Rubén; Benı́tez, Pablo; Chaves, Julio; Miñano, Juan C.; Thienpont, Hugo; Duerr, Fabian

doi:10.1364/ao.55.003794

Cited by 37 publications

(9 citation statements)

References 19 publications

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“…An increasing number of optical systems are using them as key elements to improve the performance of optical systems. For example, free-form optical elements are used in vehicle and street lamps to increase the effective illumination range and improve energy efficiency [ 1 , 2 , 3 , 4 ], and in head-mounted displays [ 5 , 6 , 7 , 8 , 9 ] and micro-projectors [ 10 , 11 , 12 , 13 , 14 ] to reduce size and weight and improve imaging quality. However, due to their high complexity and non-rotational symmetry, high-precision measurement of free-form optical elements faces significant challenges, namely, how to further improve measurement accuracy, measurement efficiency and measurement versatility to achieve the high performance and low cost required for their areas of application.…”

Section: Introductionmentioning

confidence: 99%

A Novel Approach for Measurement of Free-Form Optical Elements with Digital Holographic Microscopy

Zhang

Chen

et al. 2022

Micromachines

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Free-form optical elements face significant challenges in high-precision measurement due to their high complexity and non-rotational symmetry. Digital holographic microscopy (DHM), as one of the methods for the measurement of free-form optical elements, has promising applications due to its ultra-high precision and non-destructive and fast characteristics. Therefore, we have designed a novel measurement method that combines transmission DHM and reflection DHM to obtain thickness information and surface information of elements to deduce the 3D structure. With this method, we completed the measurement of a free-form optical element. The DHM system we built has recorded holograms under 4× and 20× objectives and successfully recovered the 3D surface shape of the element. The measurements are consistent with the designed and manufactured parameters, demonstrating the unique advantages of DHM for measuring special types of optical elements.

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Section: Introductionmentioning

confidence: 99%

A Novel Approach for Measurement of Free-Form Optical Elements with Digital Holographic Microscopy

Zhang

Chen

et al. 2022

Micromachines

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“…As such, it can guide the experienced designer towards a successful design provided an in-depth understanding of the underlying theory. The fourth design strategy relies on solving geometrical or differential equations describing the freeform optical system under study to achieve a well-performing initial design 20,21,26 . Although these methods show clear merits, so far, they lack a straightforward path to increase the number of optical surfaces that can be calculated.…”

Section: Introductionmentioning

confidence: 99%

Freeform imaging system design with multiple reflection surfaces

Nie¹,

Shafer²,

Ottevaere³

et al. 2021

Optical Design and Testing XI

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Reflective imaging systems form an important part of photonic devices such as spectrometers, telescopes, augmented and virtual reality headsets or lithography platforms. Reflective optics provide unparalleled spectral performance and can be used to reduce overall volume and weight. So far, most reflective designs have focused on two or three reflections, while four-reflection freeform designs can deliver a higher light throughput (faster F-number) as well as a larger field-of-view (FOV). However, advanced optical design strategies for four-reflection freeform systems have been rarely reported in literature. This is due to the increased complexity in solution space but also the fact that additional mirrors hinder a cost-effective realization (manufacture, alignment, etc.).Recently, we have proposed a novel design method to directly calculate the freeform surface coefficients while merely knowing the mirror positions and tilts. Consequently, this method allows laymen with basic optical design knowledge to calculate 'first time right' freeform imaging systems in a matter of minutes. This contrasts with most common freeform design processes, which requires considerable experience, intuition or guesswork. Firstly, we demonstrate the effectiveness of the proposed method for a four-mirror high-throughput telescope with 250mmfocal-length, F/2.5 and a wide rectangular FOV of 8.5⁰ × 25.5⁰. In a subsequent step, we propose an effective three-mirror but four-reflection imaging system, which consists of two freeform mirrors and one double-reflection spherical mirror. Compared with common three-mirror and three-reflection imagers, our novel multi-reflection system shows unprecedented possibilities for an economic implementation while drastically reducing the overall volume.

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“…Off-axis reflective optical systems are widely used in telescopes [1], hyperspectral imaging spectrometers [2], ultrashort throw ratio projection optics [3] and so on because of compact structure, having no blocking, absence of chromatic aberrations etc. [4]..…”

Section: Introductionmentioning

confidence: 99%

Construct freeform surface directly in an initial layout of an off-axis reflective image system by seed curve extension and simulated annealing algorithm

Pan

Zhang

et al. 2020

J. Eur. Opt. Soc.-Rapid Publ.

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In this paper, a method of how to construct a freeform surface directly in an off-axis reflective image system is proposed. The method includes both the seed curve extension algorithm and simulated annealing algorithm. Firstly, the sample points on the unkown freeform surface were be obtained quickly by the seed curve extension algorithm. Then the continuity of the freeform surface is evaluated by calculating the angle between the normal vectors at the adjacent sample points. At last the freeform surface was fitted to an extended polynomials using simulated annealing algorithm. The method is employed to construct a freeform surface directly which is used as a primary mirror in an initial layout of an off-axis two-mirror system.

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Multifield direct design method for ultrashort throw ratio projection optics with two tailored mirrors

Cited by 37 publications

References 19 publications

A Novel Approach for Measurement of Free-Form Optical Elements with Digital Holographic Microscopy

A Novel Approach for Measurement of Free-Form Optical Elements with Digital Holographic Microscopy

Freeform imaging system design with multiple reflection surfaces

Construct freeform surface directly in an initial layout of an off-axis reflective image system by seed curve extension and simulated annealing algorithm

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