scholarly journals Efficient representation of freeform gradient-index profiles for non-rotationally symmetric optical design

2020 ◽  
Vol 28 (10) ◽  
pp. 14788
Author(s):  
Tianyi Yang ◽  
Nick Takaki ◽  
Julie Bentley ◽  
Greg Schmidt ◽  
Duncan T. Moore
Keyword(s):  
Optical Design ◽  
Gradient Index ◽  
Rotationally Symmetric ◽  
Efficient Representation

A high resolution multi-turn TOF mass analyzer

2019 ◽  
Vol 34 (36) ◽  
pp. 1942005 ◽  
Author(s):  
Vyacheslav Shchepunov ◽  
Michael Rignall ◽  
Roger Giles ◽  
Ryo Fujita ◽  
Hiroaki Waki ◽  
...  
Keyword(s):  
High Resolution ◽  
Mirror Symmetry ◽  
Rotational Symmetry ◽  
Optical Design ◽  
Resolving Power ◽  
Mass Analyzer ◽  
Rotationally Symmetric ◽  
Mass Resolving Power ◽  
Operational Modes ◽  
Drift Direction

An ion optical design of a high resolution multi-turn time-of-flight mass analyzer (MT-TOF MA) is presented. The analyzer has rotationally symmetric main electrodes with additional mirror symmetry about a mid-plane orthogonal to the axis of symmetry. Rotational symmetry allows a higher density of turns in the azimuthal (drift) direction compared to MT-TOF MAs that are linearly extended in the drift direction. Mirror symmetry about a mid-plane helps to achieve a high spatial isochronicity of the ions’ motion. The analyzer comprises a pair of polar-toroidal sectors S1 and S3, a pair of polar (trans-axial) lenses, and a pair of conical lenses for longitudinal and lateral focusing. A toroidal sector S2 located at the mid-plane of the analyzer has a set of embedded drift focusing segments providing focusing and spatial isochronicity in the drift direction. The ions’ drift in the azimuthal direction can be reversed by using dedicated reversing deflectors. This gives the possibility of several operational modes with different numbers of turns and passes in the drift direction. According to numerical simulations, the mass resolving power of the analyzer ranges from [Formula: see text]40 k (fwhm) at small (typically below ten) numbers of turns to [Formula: see text]450 k (fwhm) at 96 turns.

scholarly journals A Study of High-Efficiency Laser Headlight Design Using Gradient-Index Lens and Liquid Lens

2020 ◽  
Vol 10 (20) ◽  
pp. 7331
Author(s):  
Yi-Chin Fang ◽  
Yih-Fong Tzeng ◽  
Chan-Chuan Wen ◽  
Chao-Hsien Chen ◽  
Hsiao-Yi Lee ◽  
...  
Keyword(s):  
Laser Beam ◽  
Light Source ◽  
High Efficiency ◽  
Optical Design ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
Gradient Index ◽  
High Beam ◽  
Liquid Lens ◽  
Gradient Index Lens

In the field of vehicle lighting, due to the diode laser, its small size and high energy conversion efficiency, it can be effectively used as the headlight source of high beam. In recent years, it was adopted by European advanced car manufacturers as a new generation of automotive headlight lighting products. The current mature technology on the market is to extend the laser beam by means of reflection and to use a single high-power laser as the light source to meet the needs of surface lighting. In this research, we propose a new integrated optical design for an automotive headlight system with the rod lens, gradient-index lens (GRIN lens) and freeform lens to expand the laser beam. With regard to the diffusion of the beam by reflection and refraction, the liquid lens is used as a switch for the high beam and low beam lights to meet the needs of vehicle lighting functions and to use low-power diode lasers to synthesize the array light source. Compared with the 24-W LED headlight module available in the current market, the energy saved by this proposed optical design can increase efficiency by an average of 33%. The maximum illuminance is 56.6 lux in the high-beam mode, which is 18% higher than the standard value. Let the laser light meet the lighting requirements of regulatory standard values even beyond.

On Fourier's Phase and Gradient Index Optical Design

1994 ◽  
Vol 374 ◽  
Author(s):  
Peter D. Haaland
Keyword(s):  
Refractive Index ◽  
Fourier Transform ◽  
Constrained Optimization ◽  
Phase Modulation ◽  
Fourier Transforms ◽  
Optical Design ◽  
Optical Filters ◽  
Gradient Index ◽  
Design Objective ◽  
The Relationship

AbstractGradient index or rugate optical filters are continuous generalizations of the familiar quarterwave stack which find widespread applications in sensor hardening. In the design of a filter or mirror there are infinitely many refractive index profiles n(x) whose wavelength-dependent reflectance R(λ) is specified as a design objective. The relationship between R(λ) and n(x) is nearly that of a Fourier-transform pair. Exploiting this relationship, specifically the physically indeterminate phase of the Fourier transforms, permits constrained optimization of rugate designs. In this contribution we outline the approach of optimal phase modulation and indicate by examples its application to problems in optical limiting.

scholarly journals Optical design and simulation of an integrated OCT and video rigid laryngoscope

2020 ◽  
Vol 13 (03) ◽  
pp. 2040002
Author(s):  
Jiajing Kang ◽  
Xinyu Li ◽  
Mingming Wan ◽  
Jiahui Wang ◽  
Shanshan Liang ◽  
...  
Keyword(s):  
Low Cost ◽  
Optical Design ◽  
Field Of View ◽  
Light Transmittance ◽  
Gradient Index ◽  
Modulation Transfer ◽  
Common Path ◽  
Path Design ◽  
Relay Element ◽  
Integrated Optical

An integrated optical coherence tomography (OCT) and video rigid laryngoscope have been designed to acquire surface and subsurface tissue images of larynx simultaneously. The dual-modality system that is based on a common-path design with components as few as possible effectively maintains the light transmittance without compromising the imaging quality. In this paper, the field of view (FOV) of the system can reach [Formula: see text] by use of a gradient index (GRIN) lens as the relay element and a four-lens group as the distal objective, respectively. The simulation showed that the modulation transfer function (MTF) value in each FOV of the rigid video endoscope at 160[Formula: see text]lp/mm is greater than 0.1 while the root mean square (RMS) radii of the OCT beam in the center and edge of the FOV are 14.948[Formula: see text][Formula: see text]m and 73.609[Formula: see text][Formula: see text]m, respectively. The resolutions of both OCT and video endoscope meet the requirement of clinical application. In addition, all the components of the system are spherical, therefore the system can be of low cost and easy to assemble.

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