Processing Flow of Optical Fabrication for Correcting Lenses

2007 ◽  
pp. 117-124
Author(s):  
Yun Zhang ◽  
Zhi Jing Feng
Keyword(s):  
Optical Fabrication ◽  
Processing Flow

Processing Flow of Optical Fabrication for Correcting Lenses

2007 ◽  
Vol 24-25 ◽  
pp. 117-124
Author(s):  
Yun Zhang ◽  
Jing Feng Zhi
Keyword(s):  
High Precision ◽  
Spherical Shape ◽  
Measuring Method ◽  
Free Form ◽  
Optical Fabrication ◽  
Rotation Axes ◽  
Precision Measuring ◽  
Aspheric Lenses ◽  
Axes Of Symmetry ◽  
Processing Flow

This paper presents the processing flow and results of optical fabrication for an optical correcting lens with a free-form surface, namely a free-form lens. Because a correcting lens has no rotation axes of symmetry and its surface cannot be expressed by a continuity equation, its processing technology is different with that of general aspheric lenses. The correcting lens was firstly formed from a glass workblank with flat face using diamond abrasion wheel with spherical shape, and then loose abrasive lapped and polished with oblique axis spherical tools to decrease the surface roughness and increase the surface accuracy based on the measuring result after forming. At the lapping and polishing stages, two processing methods are employed. One is to control the processing pressure, and the other is based on dwell time. Since high precision fabrication is closely related with high precision measuring, this paper also presents a high precision non-contact optical measuring method based on image transforming for correcting lenses. The effectiveness of the processing flow and technology is confirmed by an experiment in which a workblank is processed into a satisfying correcting lens.

A critical review of optical switches

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ompal Singh ◽  
Rajeev Paulus
Keyword(s):  
Future Generation ◽  
Optical Switches ◽  
Literature Survey ◽  
Optical Packet Switching ◽  
Optical Fabrication ◽  
Optical Components ◽  
Detailed Review ◽  
Switch Architectures ◽  
Packet Switch ◽  
Large Speed

Abstract Optical packet switching has gained lot of popularity in last a few years due to its advantages like, large speed, more bandwidth and very less crosstalk. But due to immature optical fabrication and designing technology OPS is still beyond reality. However, many of the optical components are commercialized and some of them are still in laboratory. Thus, for optical switches which are considered as future generation routers, many switch architectures are proposed by using different sets of optical components. This paper presents a detailed review of notable switch designs in past 20 years, and also presents a comprehensive literature survey of the notable papers related to optical packet switch designs.

High Performance Optics: The Precision Optical Fabrication

1989 ◽  
Vol 18 (4) ◽  
pp. 90-95
Author(s):  
Prakash O. Borole
Keyword(s):  
High Performance ◽  
Optical Fabrication

Jet Shape Analysis and Removal Function Optimization of Atmospheric Plasma Processing Applied in Optical Fabrication

2021 ◽  
Author(s):  
Yuan Jin ◽  
Bo Wang ◽  
Peng Ji ◽  
Zheng Qiao ◽  
Duo LI ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Rotational Symmetry ◽  
Mechanical Damage ◽  
Plasma Jet ◽  
Function Optimization ◽  
Atmospheric Plasma ◽  
Optical Fabrication ◽  
Mixed Gas ◽  
Pinch Effect ◽  
Inductively Coupled

Abstract When using Inductively Coupled Plasma (ICP) as a machining tool, its processing method based on the principle of chemical etching leads to no contact stress between the tool and the material, thereby generating no mechanical damage. In recent years, this issue has been widely concerned in the field of optical fabrication. However, there are many differences between low power ICP jet and conventional ICP jet, one of which is that the former does not easily form a rotation-symmetric removal function due to its obvious pinch effect. In this research, the electromagnetism principle of the plasma pinch effect was analyzed firstly, and the jet shape under the pinch effect was classified. Then, experimental study was carried out on the plasma jet shape under the pure Ar and mixed gas of CF4-Ar, and the influence law of the reaction gas on the jet propagation shape was analyzed. Finally, the rotational symmetry of the removal function of plasma jet processing was optimized, and the nozzle design criteria based on pinch effect were proposed.

scholarly journals Leaching of copper refractory ore: Industrial application of a preoxidation stage

2013 ◽  
Vol 32 (1) ◽  
Author(s):  
Ryno Van der Merwe
Keyword(s):  
Industrial Application ◽  
Pilot Plant ◽  
Flow Sheet ◽  
The Impact ◽  
Processing Flow

The use of a novel preoxidation method has been found to enhance the leaching of copper refractory ore in a continuous pilot plant setup. For the method to be incorporated into the processing flow sheet, the impact of high slurry density and temperature on preoxidation is established.

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