Optical Fabrication

Anderson, David J.; Burge, Jim

doi:10.1201/9780203908266.ch26

Cited by 8 publications

(11 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the past few decades, computer controlled polishing has come to the forefront in optical manufacturing as the cost of computer control has come down and the flexibility of the method is realized [2][3]. Glass mechanics and polishing parameters are also now better understood; thus, repeatability and modeling of removal functions can be established.…”

Section: Computer Controlled Polishingmentioning

confidence: 99%

“…The manufacture of large mirrors requires four phases: surface generation, grinding, polishing, and figuring [2][3]. We performed the grinding and polishing with a l00 cm tool.…”

Section: Overview Of the Manufacturing Sequencementioning

confidence: 99%

“…Conventional polishing techniques make use of proven and established polishing methods, which have been used for many decades [2][3]. Many polishing machines, tools, and techniques have been developed and refined over the years to increase efficiency and accuracy in shaping glass surfaces.…”

Section: Conventional Polishingmentioning

confidence: 99%

“…The current state of the art for flat mirror fabrication uses continuous polishing [2][3]. Two advantages gained by using continuous polishing machines are the ability to produce multiple flat mirrors simultaneously and smoothly polishing out to the mirror edges.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Fabrication and testing of large flats

Yellowhair¹,

Novak

et al. 2007

Optical Manufacturing and Testing VII

Self Cite

View full text Add to dashboard Cite

Flat mirrors of around 1 meter are efficiently manufactured with large plano polishers and measured with Fizeau interferometry. We have developed technologies and hardware that allow fabrication and testing of flat mirrors that are much larger. The grinding and polishing of the large surfaces uses conventional laps driven under computer control for accurate and systematic control of the surface figure. The measurements are provided by a combination of a scanning pentaprism test, capable of measuring power and low order irregularity over diameters up to 8 meters, and subaperture Fizeau interferometry. We have developed a vibration insensitive Fizeau interferometer with 1 meter aperture and software to optimally combine the data from the subaperture tests. These methods were proven on a 1.6 m flat mirror that was finished to 6 nm rms irregularity and 11 nm rms power.

show abstract

Section: Computer Controlled Polishingmentioning

confidence: 99%

“…The manufacture of large mirrors requires four phases: surface generation, grinding, polishing, and figuring [2][3]. We performed the grinding and polishing with a l00 cm tool.…”

Section: Overview Of the Manufacturing Sequencementioning

confidence: 99%

Section: Conventional Polishingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fabrication and testing of large flats

Yellowhair¹,

Novak

et al. 2007

Optical Manufacturing and Testing VII

Self Cite

View full text Add to dashboard Cite

show abstract

“…By contrast, an aspheric surface is difficult to manufacture because large rigid tools cannot fit everywhere on the surface [1]. Many modern sub-aperture deterministic polishing technologies that use embedded intelligent control systems with radically different polishing mechanisms have recently been developed to produce aspheric surfaces.…”

Section: Introductionmentioning

confidence: 96%

Optimal strategy for fabrication of large aperture aspheric surfaces

et al. 2013

View full text Add to dashboard Cite

Aspheric surfaces are widely used because of their desirable characteristics. Such a surface can obtain nearly perfect imaging quality with fewer optical elements and reduce the size and mass of optical systems. Various machine systems have been developed based on modern deterministic polishing technologies for large aperture aspheric surfaces. Several factors affect the final precision of large aperture aspheric surfaces, such as the velocity limit of the machine and the path design. Excess velocity, which will be truncated automatically by the computer numerical control system, may cause the dwell time to deviate from the desired time. When a path designed on a two-dimensional surface map with equidistant pitch is projected onto an aspheric surface, the pitch changes as a result of the varied curvature of the aspheric surface. This may affect the removal map and cause some ripple errors. A multiregion distribution strategy, which includes velocity checking, is proposed in this study to avoid exceeding the velocity limits. The strategy can be used to modify local errors and edge effects. A three-dimensional spiral path generation method is also presented using an iterative method to ensure uniformity in the space length of the adjacent circle of the spiral path. This process can reduce the ripple error caused by the overlapping of tool paths. A polishing experiment was conducted, and the results proved the validity of the proposed strategies.

show abstract