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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 16 — Jun. 1, 2013
  • pp: 3719–3725

Morphology evolution of fused silica surface during ion beam figuring of high-slope optical components

Wenlin Liao, Yifan Dai, Xuhui Xie, and Lin Zhou  »View Author Affiliations

Applied Optics, Vol. 52, Issue 16, pp. 3719-3725 (2013)

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Ultra-precision and ultra-smooth surfaces are vitally important for some high performance optical systems. Ion beam figuring (IBF) is a well-established, highly deterministic method for the final precision figuring of extremely high quality optical surfaces, whereas ion sputtering induced smoothing, or roughening for nanoscale surface morphology, strongly depends on the processing conditions. Usually, an improper machining method would arouse the production of nanoscale patterns leading to the coarsening of the optical surface. In this paper, the morphology evolution mechanism on a fused silica surface during IBF of high-slope optical components has been investigated by means of atomic force microscopy. Figuring experiments are implemented on two convex spherical surfaces by using different IBF methods. Both of their surface errors are rapidly reduced to 1.2 nm root mean square (RMS) after removing similar deep material, but their surfaces are characterized with obviously different nanoscale morphologies. The experimental results indicate that the ion incidence angle dominates the microscopic morphology during the IBF process. At near-normal incidence, fused silica achieves an ultra-smooth surface with an RMS roughness value Rq down to 0.1 nm, whereas nanoscale ripple patterns are observed at a large incidence angle with an Rq value increasing to more than 0.9 nm. Additionally, the difference of incidence angles on various machined areas would influence the uniformity of surface quality, resulting from the interplay between the smoothing and roughening effects induced by ion sputtering.

© 2013 Optical Society of America

OCIS Codes
(220.0220) Optical design and fabrication : Optical design and fabrication
(220.4610) Optical design and fabrication : Optical fabrication
(220.5450) Optical design and fabrication : Polishing

ToC Category:
Optical Design and Fabrication

Original Manuscript: March 4, 2013
Revised Manuscript: April 17, 2013
Manuscript Accepted: April 19, 2013
Published: May 27, 2013

Wenlin Liao, Yifan Dai, Xuhui Xie, and Lin Zhou, "Morphology evolution of fused silica surface during ion beam figuring of high-slope optical components," Appl. Opt. 52, 3719-3725 (2013)

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