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Optical design of a compact and high-transmittance compressive sensing imaging system enabled by freeform optics

Chinese optics Letters 2021年第11期19卷 117-123页

作者： Dewen Cheng Hailong Chen Tong Yang Jun Ke Yang Li Yongtian Wang School of optics and Photonics Beijing Institute of TechnologyBeijing 100081China Beijing Engineering Research Center of Mixed Reality and Advanced Display School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Advanced Optical Remote Sensing Technology School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China

Using compressive sensing for imaging has many applications, and it is an important branch of computational *** this Letter, freeform surfaces are introduced in the hardware optical system design of a compressive sensing imager. The system works under the medium wave infrared band and realizes a 16× compression with a field-of-view of 7.5°× 6°. Good imaging performance is achieved in both the entire system and the freeform objective optics. Compared with the system using all spherical lenses, the volume of the freeform system is about 1/3 smaller, and the total transmittance is about 56%higher, which shows the benefits of using freeform surfaces for compressive sensing and computational imaging.

关键词： compressive sensing freeform optics compactness and high-transmittance joint optimization

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Advances in the design and manufacturing of novel freeform optics

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International Journal of Extreme Manufacturing 2022年第3期4卷 65-97页

作者： Sumit Kumar Zhen Tong Xiangqian Jiang EPSRC Future Metrology Hub Centre for Precision TechnologiesUniversity of HuddersfieldHuddersfield HD13DHUnited Kingdom

freeform optics has become the most prominent element of the optics industry. Advanced freeform optical designs supplementary to ultra-precision manufacturing and metrology techniques have upgraded the lifestyle, thinking, and observing power of existing *** related to space explorations, portability, accessibility have also witnessed sensible in today’s time with freeform optics. Present-day design methods and fabrications techniques applicable in the development of freeform optics and the market requirements are focussed and explained with the help of traditional and non-traditional optical applications. Over the years,significant research is performed in the emerging field of freeform optics, but no standards are established yet in terms of tolerances and definitions. We critically review the optical design methods for freeform optics considering the image forming and non-image forming applications. Numerous subtractive manufacturing technologies including figure correction methods and metrology have been developed to fabricate extreme modern freeform optics to satisfy the demands of various applications such as space, astronomy, earth science, defence,biomedical, material processing, surveillance, and many more. We described a variety of advanced technologies in manufacturing and metrology for novel freeform optics. Next, we also covered the manufacturing-oriented design scheme for advanced optics. We conclude this review with an outlook on the future of freeform optics design, manufacturing and metrology.

关键词： freeform optics optical design optical fabrication ultra-precision machining surface metrology

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Iterative freeform lens design for prescribed irradiance on curved target

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Opto-Electronic Advances 2020年第7期3卷 1-9,I0001页

作者： Zexin Feng Dewen Cheng Yongtian Wang Beijing Engineering Research Center of Mixed Reality and Advanced Display School of Optics and PhotonicsBeijing Institute of TechnologyBeijing100081China Beijing Key Laboratory of Advanced Optical Remote Sensing Technology School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China

Current freeform illumination optical designs are mostly focused on producing prescribed irradiance distributions on planar ***,we aim to design freeform optics that could generate a desired illumination on a curved target from a point source,which is still a *** reduce the difficulties that arise from the curved target by involving its varying z-coordinates in the iterative wavefront tailoring(IWT)*** new IWT-based method is developed under the stereographic coordinate system with a special mesh transformation of the source domain,which is suitable for light sources with light emissions in semi space such as LED *** first example demonstrates that a rectangular flat-top illumination can be generated on an undulating surface by a spherical-freeform lens for a Lambertian *** second example shows that our method is also applicable for producing a non-uniform irradiance distribution in a circular region of the undulating surface.

关键词： freeform optics prescribed irradiance distribution curved target iterative wavefront tailoring

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freeform spectrometer enabling increased compactness

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Light(Science & Applications) 2017年第1期6卷 646-655页

作者： Jacob Reimers Aaron Bauer Kevin P Thompson Jannick P Rolland The Institute of optics University of RochesterRochesterNY 14627USA Synopsys Inc.3 Graywood LanePittsfordNY 14534USA

We present optical designs with freeform optics in the context of hyperspectral *** show designs that are 5×more compact in volume than similar designs using conventional spherical or aspherical *** will show how combining the concepts of spatial and spectral-band broadening,which will be introduced in this paper,led to the improvement in compactness that is uniquely enabled by freeform optics.

关键词： aberrations freeform optics imaging spectrometer

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Optical Design of TIR Led Secondary optics

Optical Design of TIR Led Secondary Optics

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第11届粤港机械电子工程技术与应用研讨会

作者： TO,S. JIANG,J.B. Advanced optics Manufacturing Centre Department of Industrial and Systems EngineeringThe Hong Kong Polytechnic University

＜正＞Secondary optics are critical components used to create the desired appearance and beam pattern for the lighting emitting diode（LED） devices and *** this paper,design methodologies of the total internal reflective（TIR） LED secondary optics are investigated,which are deduced from the Snell’ s law[1]according to the conservation of energy,etendue conservation[2]and edge-ray principle[3].High efficiency and good uniformity are realized,every rays emitted from the LED are considered to create a high efficiency and uniform desired light pattern.

关键词： LED secondary optics Optical design freeform optics Etendue conservation Edge ray principle

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