On the ultra-precision diamond machining of chalcogenide glass

Owen, Joseph D.; Davies, Matthew A.; Schmidt, D. W.; Urruti, Eric H.

doi:10.1016/j.cirp.2015.04.065

Cited by 43 publications

(12 citation statements)

References 14 publications

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“…This is largely due to the fact that fabrication of freeform surfaces has reached a level at which optical surfaces of good quality can be manufactured by different fabrication processes with sufficiently high accuracy. [1][2][3][4] Fields of applications include vehicle lighting 5,6 or beam expanders 7 as well as artistic exhibits, 8,9 or design elements in architecture. 10 An interesting approach is forming varifocal optics on the basis of freeform optical elements.…”

Section: Introductionmentioning

confidence: 99%

Design studies of varifocal rotation optics

Sieber¹,

Stiller²,

Gengenbach³

2018

Opt. Eng.

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We present the design of a varifocal freeform optics consisting of two lens bodies each with a helicaltype surface structure of azimuthally varying curvatures. This arrangement allows for tuning the optical refraction power by means of a mutual rotation of the lens bodies around the optical axis. Thus, the refraction power can be tuned continuously in a defined range. The shape of the helical-type surfaces is formed by a change in curvature subject to the azimuthal angle α. At the transition of the azimuthal angle from α ¼ 2π to α ¼ 0, a surface discontinuity appears. Since this discontinuity will seriously affect the imaging quality, it has to be obscured. In the initial state, i.e., zero-degree rotation, the curvatures of the opposing surfaces result in a specific refraction power, which is constant over the entire circular aperture. Rotating one of the lens bodies by an angle φ around the optical axis will change the opposing curvatures and result in a change of refraction power. Two circular sectors with different tunable optical refraction powers are formed, thus resulting in a tunable bifocal optics. Obscuring the minor sector will result in a tunable monofocal rotation optics. In contrast to conventional tunable lens systems, where additional space for axial or lateral lens movement has to be allocated in design, rotation optics allowing for a more compact design. A performance analysis of the rotation optics based on simulations is presented in dependence on aperture size as well as approaches to compensate for spherical aberrations. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Section: Introductionmentioning

confidence: 99%

Design studies of varifocal rotation optics

Sieber¹,

Stiller²,

Gengenbach³

2018

Opt. Eng.

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“…Despite its excellent features, glass processing technology is facing a lot of challenges like low surface finish, chipping, tool wear, and subsurface damage. From the past few decades, various traditional and non-traditional processes like abrasive jet machining, laser beam machining, and ultrasonic machining has been used for glass machining [2][3][4]. Fang et al [5]used turning on the ZKN7 glass and found high tool wear.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of surface roughness for brittle material during rotary ultrasonic machining

et al. 2018

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Surface roughness is the key aspect which could increase the application of float glass by enhancing the machined hole quality. Glass is extensively used in microfluidic devices, bio-medical parts and biosensors. The core objective of the research study is to optimize the best parametric combination to achieve the least amount of surface roughness. The three major parameters which are used for designed experimental study are spindle speed, ultrasonic amplitude and feed rate. The least value of surface roughness is noticed at spindle speed (5000 rpm), vibration amplitude (20 μ m) and feed rate (6 mm/min) which be adopted for increasing its functional application. Consequently, after optimizing the parameters, least value of surface roughness at hole internal region is revealed as 1.09 μm.

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“…With the advancement of modern precision optical fabrication technologies, freeform optical components can be manufactured with a sufficiently high accuracy [1,2]. Under this condition, a spherical surface is not anymore the only choice in current optical design.…”

Section: Introductionmentioning

confidence: 99%

Metrology Data-Based Simulation of Freeform Optics

Sieber

Gengenbach

2018

Applied Sciences

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This paper describes the approach to use measurement data to enhance the simulation model for designing freeform optics. Design for manufacturing of freeform optics is still challenging, since the classical tolerancing procedures cannot be applied. In the case of spherical optics manufacturing, tolerances are more or less isotropic, and this relationship is lost in case of freeform surfaces. Hence, an accurate performance prediction of the manufactured optics cannot be made. To make the modeling approach as accurate as possible, integration of measured surface data of fabricated freeform optics in the modeling environment is proposed. This approach enables performance prediction of the real manufactured freeform surfaces as well as optimization of the manufacturing process. In our case study this approach is used on the design of an Alvarez-optics manufactured using a microinjection molding (µIM) process. The parameters of the µIM process are optimized on the basis of simulation analysis resulting in optics, with a performance very close to the nominal design. Measurement of the freeform surfaces is conducted using a tactile surface measurement tool.

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On the ultra-precision diamond machining of chalcogenide glass

Cited by 43 publications

References 14 publications

Design studies of varifocal rotation optics

Design studies of varifocal rotation optics

Enhancement of surface roughness for brittle material during rotary ultrasonic machining

Metrology Data-Based Simulation of Freeform Optics

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