Fabrication of 4-meter class astronomical optics

Valente, M.; Kim, D. W.; Oh, Chang Wan; Novak, Matt; Burge, James H.

doi:10.1117/12.861979

Cited by 2 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…<10% stability) and superb surface finish (e.g. <1nm RMS surface roughness) [18], can be used more efficiently with the known smoothing factor for large precision optics fabrications [19,20]. It will contribute to the realization of some next generation optical systems which usually have hundreds of meter-class aspheric mirrors (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…The RC lap, which takes advantages from both rigid and compliant tools in two different time scales using a visco-elastic non-Newtonian fluid, has been introduced and used on highly aspheric optical surfaces [18][19][20]. The overall structure of the lap is shown in Fig.…”

Section: Rigid Conformal Lapmentioning

confidence: 99%

“…A rigid conformal (RC) lap using a visco-elastic non-Newtonian fluid was developed and introduced in a previous study [18][19][20]. (Note: A US provisional patent was filed for the RC lap.)…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Parametric smoothing model for visco-elastic polishing tools

Kim

Park

et al. 2010

Opt. Express

View full text Add to dashboard Cite

A parametric smoothing model is developed to quantitatively describe the smoothing action of polishing tools that use visco-elastic materials. These materials flow to conform to the aspheric shape of the workpieces, yet behave as a rigid solid for short duration caused by tool motion over surface irregularities. The smoothing effect naturally corrects the mid-to-high frequency errors on the workpiece while a large polishing lap still removes large scale errors effectively in a short time. Quantifying the smoothing effect allows improvements in efficiency for finishing large precision optics. We define normalized smoothing factor SF which can be described with two parameters. A series of experiments using a conventional pitch tool and the rigid conformal (RC) lap was performed and compared to verify the parametric smoothing model. The linear trend of the SF function was clearly verified. Also, the limiting minimum ripple magnitude PVmin from the smoothing actions and SF function slope change due to the total compressive stiffness of the whole tool were measured. These data were successfully fit using the parametric smoothing model.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Rigid Conformal Lapmentioning

confidence: 99%