Design and engineering verification of an ultrashort throw ratio projection system with a freeform mirror

Yu, Baihua; Tian, Z.; Su, Dongqi; Sui, Yongxin; Yang, Hang

doi:10.1364/ao.58.003575

Cited by 11 publications

(4 citation statements)

References 18 publications

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“…Freeform optics is widely used in various areas, such as machine vision [1], remote sensing [2], wearable displays [3]. The advantage of freeform optics are as follows:…”

Section: Introductionmentioning

confidence: 99%

Wavefront aberrations measurement of freeform surface based on computer-generated hologram technology

Wei,

Xu,

2023

Fifth International Symposium on High Power Laser Science and Engineering (HPLSE 2023)

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“…Freeform optics is widely used in various areas, such as machine vision [1], remote sensing [2], wearable displays [3]. The advantage of freeform optics are as follows:…”

Section: Introductionmentioning

confidence: 99%

Wavefront aberrations measurement of freeform surface based on computer-generated hologram technology

Wei,

Xu,

2023

Fifth International Symposium on High Power Laser Science and Engineering (HPLSE 2023)

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“…Due to strict requirements that modern optical systems have for imaging quality, volume and weight, spatial arrangement and other aspects, it is difficult for traditional spherical and aspherical optical elements to meet their relevant requirements [1,2].Free-form optical element, featuring multiple degrees of freedom, can effectively optimize and improve the imaging quality, decrease the aperture and amount of optical elements, and achieve better flexibility in spatial arrangement, thus allowing the design of optical system to be much freer. Hence, there have been an increasing number of optical systems with novel structures and flexible imaging emerging, such as beam shaping systems with variable illumination [3], spatial optical imaging system [4,5], wearable optical equipment [6][7][8], projection system with an ultra-short focal length [9,10], freeform aluminum optical system [11,12].…”

Section: Introductionmentioning

confidence: 99%

Establishment and analysis of feasibility evaluation system and ultra-precision manufacturing technology for small aperture free-form surface optical element

Huang²,

Zhao³

et al. 2022

Preprint

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Free-form optical elements are more and more broadly used in modern optical systems due to their distinctive characteristics. In order to realize the high precision manufacturing of free-form optical element, the constraints on parameters of manufacture and measurement were established based on the designing parameters of free-form optical element. Meanwhile, the evaluation system for the machinability and detectability of free-form optical element were obtained by means of the corresponding mathematical model. Furthermore, the White Light Interference (WLI) stitching detection technology, coupled with the least square multi-parameter optimization algorithm, was used to solve shape-error measurement of free-form optical element. Additionally, a free-form surface compensation manufacturing mechanism of asymmetric shape error was established. Based on the above methods, the polynomial free-form optics were processed and measured. According to the surface shape measurement results, the same element was processed with compensation manufacturing twice. The surface shape precision was obviously improved from PV = 2553nm and RMS = 481nm to PV = 214nm and RMS = 19.9nm, which verified the effectiveness of the method. A significant value was unfolded in the engineering application of this method.

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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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Design and engineering verification of an ultrashort throw ratio projection system with a freeform mirror

Cited by 11 publications

References 18 publications

Wavefront aberrations measurement of freeform surface based on computer-generated hologram technology

Wavefront aberrations measurement of freeform surface based on computer-generated hologram technology

Establishment and analysis of feasibility evaluation system and ultra-precision manufacturing technology for small aperture free-form surface optical element

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

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